FlexLogix

Selection Guide

FlexLogix selguide cov.qxd 7/12/00 1:16 PM Page 2

Distributed Control Without Compromise

The distributed approach to control drastically
reduces field wiring and heightens performance
because the controller and I/O are placed close to
the machine or process. FlexLogix achieves dis-
tributed control without the compromises -- such
as reduced processing power and programming
capability -- common to other distributed control
solutions. Instead, the FlexLogix distributed control
platform combines these industry-leading elements:
• FlexLogix controllers, having the same powerful

control engine as the one found in the high-per-
formance ControlLogix platform

• RSLogix 5000 programming software, the

Microsoft Windows NT package shared by other
Logix Platforms controllers

• FLEX I/O, the compact, DIN-rail mounted I/O

system found in thousands of industrial applica-
tions

• NetLinx Rockwell Automation network architec-

ture, a complete set of network services and
communication over DeviceNet, ControlNet and
Ethernet

No other vendor offers such state-of-art control,
communications and I/O elements in a distributed
control package.

In the distributed architecture (top), each oven has its own FlexLogix system, each communi-

cating via a single network to other FlexLogix systems, while in the centralized architecture

(bottom) operation of the three ovens relies on a single controller .

Modularity means you have the ability to

precisely fit the system to your machine or

application. The FlexLogix controller and

FLEX I/O may be mounted vertically or

horizontally, and the I/O may be placed in a

continuous stack or in two segments. And

you can mount the system onto a standard

DIN rail or onto a wall or panel.

Why Distributed Control?

For twenty years, customers have increasingly seen the advantage of moving away from central-
ized control. In a centralized control architecture, a master controller scans for I/O data, result-
ing in a system that is communication intensive and vulnerable to failure. In contrast, in a dis-
tributed control architecture:
• I/O data is handled locally and transmitted only when an event occurs, creating a less commu-

nication intensive architecture

• Control does not depend on a master controller, creating an architecture less vulnerable to

failure

• Control resides close to the machinery to establish zone control, station control or line control

Rockwell Automation’s Logix Platforms offer users compatibility of control in a variety of formats. This compatibility
is achieved with an RSLogix 5000 programming environment and with the NetLinx open network architecture. The
RSLogix 5000 environment offers an easy-to-use IEC 1131-3 compliant interface, symbolic programming with struc-
tures and arrays for increased productivity, and an instruction set that serves sequential, motion, process and drives

applications. The NetLinx open
architecture includes such open
networks as Ethernet, ControlNet
and DeviceNet.

Table of Contents

FlexLogix System Overview . . . . . . . . . .

Selecting FLEX I/O Modules . . . . . . . . . . 17

Planning Network Communications . . . . . . . . 25

Selecting a Controller . . . . . . . . . . . .

Selecting a Power Supply . . . . . . . . . . . 45

Planning the DIN Rails . . . . . . . . . . . . 47

Selecting Software . . . . . . . . . . . . . . 49

Choose up to two optional network cards for

for ControlNet or, in the near future, Ethernet

or DeviceNet networks. And with the RSLinx

component of RSLogix 5000 software, you

can use your personal computer to communi-

cate to any FlexLogix controller locally, or dis-

tributed across a network.

A Controller You Can Adjust To Fit

Your Application

The FlexLogix controller offers you the flexibility to:
• Choose the memory size your application requires
• Select the communications you want via communica-

tion cards and a built in rs-232 port

• Determine how much I/O you want to control and pick

the modules needed for the application, with room to
expand in the future

• Divide your application into tasks for structured, fast

program development

FlexLogix System Overview

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FlexLogix System Overview

The FlexLogix controller is one of the Logix platforms. The FlexLogix
controller provides a distributed control system built on
these components:

•

FlexLogix controller that supports the Logix instructions.

•

RSLogix 5000 programming software that supports the Logix
family of controllers.

•

FLEX I/O modules that provide a compact, DIN-rail mounted
I/O system.

•

1788 communication daughtercard that provides communication
over a standards-based ControlNet network.

A simple FlexLogix system can consist of a single, stand-alone
assembly with one controller and as many as eight I/O modules.

Or you can use multiple controllers across networks. Distribute
multiple I/O platforms over multiple I/O links.

FlexLogix controller

1794 I/O modules in the
local I/O assembly

computers
other controllers

ControlNet link

remote
I/O modules

}

1794 I/O modules in the
local I/O assembly

1794 I/O modules in the
extended- local I/O assembly

FlexLogix
controller

1788
communication
daughtercards

built-in
RS-232 port

Example System Configuration

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Example FlexLogix System

Use the following example as a guide to completing your own
system specification. Follow these steps as you specify your
FlexLogix system:

See page 6

See page 7

See page 9

See page 10

See page 12

See page 13

See page 16

Step 1

Determine the
I/O devices

Step 2

Layout the system and
select communication
modules

Step 3

Determine controller
requirements

Step 4

Determine the number of
DIN rails

Step 5

Select power supplies
and ensure sufficient
power

Step 6

Verify communications

Step 7

Select software

Example System Configuration

1794-SG001A-EN-P July 2000

Step 1:
Determine the I/O Devices

Use a spreadsheet to record the amount and type of I/O devices the
FlexLogix system needs. Record the:

•

location of the device

•

number of points needed

•

appropriate catalog number

•

number of points available per module

•

number of modules

To determine the number of modules you need, divide the “number
of points needed” by the “I/O points per module.” For example:

For more information about FLEX I/O modules and how they operate,
see page 17.

I/O device:

Location:

Number of
points needed:

Catalog
number:

I/O points per
module:

Number of
modules:

120V ac digital inputs

1794-IA8

120V ac digital outputs

1794-OA8

24V dc digital inputs

1794-IB16

24V dc digital outputs

1794-OB16

contact digital outputs

1794-OW8

4-20mA analog inputs

1794-IF4I

0-10V dc analog inputs

1794-IF4I

(use the remaining

points from the above
1794-IF4I module)

4-20mA analog outputs

1794-OF4I

Location A subtotal 18

120V ac digital inputs

1794-IA8

120V ac digital outputs

1794-OA8

24V dc digital inputs

1794-IB16

24V dc digital outputs

1794-OB16

contact digital outputs

1794-OW8

4-20mA analog inputs

1794-IF4I

0-10V dc analog inputs

1794-IF4I

(use the remaining

points from the above
1794-IF4I module)

4-20mA analog outputs

1794-OF4I

Location B subtotal 13

Example System Configuration

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Step 2:
Layout the System

Layout the system by determining the network configuration and
the placement of components in each location. Decide at this
time whether each location will have its own controller.

Use the FlexLogix system to distribute control among different
locations. You might want one central controller, such as a
ControlLogix controller, to coordinate your FlexLogix
controllers. If the FlexLogix controller uses remote I/O, place it
on its own ControlNet network. If you plan to share I/O, make
sure the I/O is on a network that each controller can access.

Each FlexLogix controller can support:

•

8 local I/O modules

•

8 extended-local I/O modules

•

16 remote I/O modules over ControlNet

Adding to the example in Step 1, Location A and Location B
each require a unique FlexLogix controller. Location A has more
I/O modules than the controller can support as local I/O, so
some I/O will be configured as remote I/O over ControlNet.

The extended-local I/O in Location A requires a 1794-FLA
extended-local adapter. The remote I/O in Location A requires
an appropriate ControlNet adapter for the type of I/O modules.
These are all FLEX I/O modules, so use a 1794-ACN15, -ACNR15
ControlNet adapter.

For more information about placing I/O modules, see page 23.

You also need to evaluate what communications need to occur
between the controllers. For non-time critical information, use
the ControlNet network to send messages. If the information is
time critical, use produced/consumed tags between the
controllers over the ControlNet network.

Location

ControlNet network A

ControlNet network B

central
controller

remote I/O

extended-local DIN rail

local DIN rail

local I/O

Location

extended-local DIN rail

local DIN rail

local I/O

Example System Configuration

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Placing communication modules

Determine the number of communication interfaces. The FlexLogix
controller supports 2 communication cards.

Location A requires one communication card to attach to ControlNet
network A and a second communication card to attach to ControlNet
network B. Add the communication modules to the spreadsheet:

For more information about networks and communication modules,
see page 25.

I/O device:

Location:

Number of
points needed:

Catalog
number:

I/O points per
module:

Number of
modules:

120V ac digital inputs

1794-IA8

120V ac digital outputs

1794-OA8

24V dc digital inputs

1794-IB16

24V dc digital outputs

1794-OB16

contact digital outputs

1794-OW8

4-20mA analog inputs

1794-IF4I

0-10V dc analog inputs

1794-IF4I

(use the remaining

points from the
above 1794-IF4I
module)

4-20mA analog outputs

1794-OF4I

Extended-local adapter

1794-FLA

ControlNet communication card

1788-CNC

ControlNet remote I/O adapter

1794-ACN15

Location A subtotal 22

Example System Configuration

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Step 3:
Determine the Controller
Requirements

The following equations provide an estimate of the memory
needed for a controller. Each of these numbers includes a rough
estimate of the associated user programming. Depending on the
complexity of your application, you might need more or
less memory.

Controller tasks

_____ * 4000 = _____ bytes (minimum 1 needed)

Digital I/O points

_____ * 400

= _____ bytes

Analog I/O points

_____ * 2600 = _____ bytes

Communication modules_____ * 5000= _____ bytes

Motion axis

_____ * 8000 = _____ bytes

Total=_____ bytes

For example, this table lists configurations for Location A and
Location B:

These FlexLogix controllers are available:

Then estimate memory to help choose the controller:

Location A:

Location B:

Controller tasks:

1 continuous
1 periodic (STI)

1 continuous

Digital I/O points

48 + 25 + 43 + 15 + 5 = 136

35 + 15 + 23 + 13 + 5 = 91

Analog I/O points:

6 + 2 + 4 = 12

3 + 1 + 2 = 6

Communication modules:

two 1788-CNC cards

Controller:

Available User Memory

1794-L33

64 Kbytes

1794-L34

512 Kbytes

Location A (bytes):

Location B (bytes):

Controller tasks:

(2 x 4000) = 48,000

(1 x 4000) = 4000

Digital I/O points:

(136 x 400) = 54,400

(91 x 400) = 36,400

Analog I/O points:

(12 x 2600) = 31,200

(6 x 2600) = 15,600

Communication modules:

(2 x 5000) = 10,000

Total bytes: 143,600

66,000

Selected controller: 1794-L34

1794-L34

Example System Configuration

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Step 4:
Determine the Number of
DIN Rails

You can horizontally or vertically mount the FlexLogix system on
steel, 35 x 7.55mm DIN rails (A-B part number 199-DR1; 46277-3; EN
50022). The DIN rails for all FlexLogix system components, including
all local and extended-local I/O modules, must be mounted on a
common, conductive surface to ensure proper electromagnetic
interference (EMI) performance.

Use the optional 1794-CE1 (0.3m, 1ft) or 1794-CE3 (0.9m, 3ft) extender
cable to add an extended-local rail of I/O to the controller. You can
have as many as eight I/O modules on the local rail and eight
modules on the extended-local rail.

local rail

extended-local rail
requires 1794-FLA adapter

Example System Configuration

1794-SG001A-EN-P July 2000

You can also use the 1794-CE1, -CE3 cable to split the I/O on
one rail into two locations. The cable can be used between any
module or adapter. You can have only one split per rail.

For more information about placing DIN rails, see page 47.

1794-CE1 or
1794-CE3 cable

Example System Configuration

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Step 5:
Select Power Supplies and
Ensure Sufficient Power

Create a spreadsheet to record your module selections and calculate
power requirements. Complete one spreadsheet for each rail of
components. For example:

Power Requirements for Location A, Local Rail

If your power consumption exceeds the maximums for a single power
supply, install additional power supplies or separate the I/O modules
onto multiple rails.

For more information about selecting a power supply, see page 45.

1794-L33

1794-IA8

1794-OA8

Catalog Number:

Nominal on state current:

Power dissipation:

1794-L33

640mA

21.1W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

totals: 677.4mA

55.5W

Example System Configuration

1794-SG001A-EN-P July 2000

Step 6:
Verify Communications

The following table shows how many connections the controller
uses for these different communication configurations

For example, to calculate the connections for the example
controller in Location A, add the connections. Assume the
controller has these data transfer connections:

To calculate the number of connections for the modules in
Location A, add the connections required for:

•

modules on the local rail

•

modules on the extended-local rail

•

remote I/O modules

For more information about how the controller uses connections
for I/O modules, see page 36.

For each of these components:

The FlexLogix
controller uses this
many connections:

local rail
(a required rack-optimized connection)

local I/O module
(if configured for a direct connection)

extended-local rail
(a required rack-optimized connection, even if you do not use the extended-local rail)

1794-FLA extended-local adapter

extended-local I/O module
(if configured for a direct connection)

remote I/O module
(if configured for a direct connection only)

local 1788-CNC module

remote 1788-CNC module

remote 1756-CNB module
(if configured for a rack-optimized connection)

produced tag

produced tag and one consumer
each additional consumer of the tag

1
1

consumed tag

block-transfer message

other message

Connection Type:

Quantity:

Total
Connections:

produced tags

produced tag
each consumer of the tag

2
4

consumed tags

other messages

total 22

Example System Configuration

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Connections for Location A, Local Rail

In this example, the controller uses one rack-optimized rack to control
the local I/O on the local rail.

Connections for Location A, Extended-Local Rail

In this example, the controller uses one rack-optimized rack to control
the local I/O on the extended-local rail. The controller also has direct
connections to the 1794-IB16 and 1794-OB16 I/O modules.

Regardless of how you configure the I/O modules on either the local
rail or the extended-local rail, the controller establishes a
rack-optimized connection for each rail.

Catalog Number:

Nominal
on state
current:

Power
dissipation:

Connections:

Direct

Rack

1794-L33

640mA

21.1W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

1794-OA8

2.25mA

4.1W

totals: 677.4mA

55.5W

Catalog Number:

Nominal
on state
current:

Power
dissipation:

Connections:

Direct

Rack

1794-FLA

250mA

6.0W

1794-IA8

7.1mA

4.5W

1794-IA8

7.1mA

4.5W

1794-IB16

1.5mA

6.1W

1794-IB16

1.5mA

6.1W

1794-IB16

1.5mA

6.1W

1794-OB16

80mA

5.3W

totals: 348.7mA

38.6W

Example System Configuration

1794-SG001A-EN-P July 2000

Connections for Location A, Remote I/O

Total connections

Based on the example tallies, the controller in Location A uses
these connections:

Catalog Number:

Nominal
on state
current:

Power
dissipation:

Connections:

Direct

Rack

1794-ACN15

640mA

4.6W

1794-OW8

1mA

5.5W

1794-IF4I

20mA

2.0W

1794-IF4I

20mA

2.0W

1794-OF4I

20mA

4.7W

totals: 701mA

18.8W

Location:

Total
Connections:

data transfer (see page 13)

modules on the local rail

modules on the extended-local rail

remote I/O

total: 32

Example System Configuration

1794-SG001A-EN-P July 2000

Step 7:
Select Software

Your selection of modules and network configuration determines
what software packages you need to configure and program
your system.

For more information about selecting software packages, see page 49.

If you have a:

You need:

Order this catalog number:

1794 FlexLogix controller

RSLogix 5000 programming software

9324 series
(RSLogix 5000 programming software)

1788-CNC, -CNCR ControlNet
communication card

RSNetWorx for ControlNet
(comes with RSLogix 5000 programming software
and RSNetWorx for ControlNet bundle)

9324-RLD300NXENE (RSLogix 5000 programming
software plus RSNetWorx option)
or
9357-CNETL3

communication card in a
workstation

RSLinx software
(comes with RSLogix 5000 programming software)

9324 series
(RSLogix 5000 programming software)

workstation dedicated for
operator interface

RSView32 software

9301 series

PanelView terminal

PanelBuilder software

2711-ND3 for PanelBuilder 900
or
2711E-ND1 for PanelBuilder 1400e

Selecting FLEX I/O Modules

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Selecting FLEX I/O Modules

The FlexLogix system adds control to the flexible, low-cost,
modular FLEX I/O system. Use FlexLogix systems to meet the
needs of your distributed applications. The FlexLogix system
also lets you remove and insert I/O modules under power.

When planning I/O communications, consider:

FLEX I/O modules are packaged I/O modules that plug into
terminal bases. The terminal base makes the backplane and
provides the terminal connection points for wiring the I/O
module. The FlexLogix controller supports FLEX and FLEX Ex
I/O modules.

Considerations when planning I/O:

See page:

which FLEX I/O modules to use

where to place FLEX I/O modules

how FLEX I/O modules operate

This family of I/O modules:

Provides:

FLEX I/O

modular I/O

FLEX I/O builds an I/O interface onto a terminal strip. Use the terminal strip on the
terminal base to wire field devices directly.

FLEX Ex

intrinsically safe I/O

FLEX Ex adds intrinsic safety isolation to the modularity of FLEX I/O. Dual-fault,
intrinsically-safe circuits let you install I/O in a hazardous area while maintaining
high fault tolerance.

Do not mix regular FLEX I/O and FLEX Ex I/O on the same ControlNet
network segment.

Important:

If you use FLEX Ex I/O modules, make certain that you only
connect the intrinsically-safe I/O modules to other
intrinsically-safe system modules to maintain the integrity of
the intrinsically-safe system.

Selecting FLEX I/O Modules

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Digital I/O Modules

1794 FLEX digital ac input module

1794 FLEX digital dc input modules

1794 FLEX digital ac output modules

Catalog
number:

Number of
inputs:

Voltage
category:

Operating
voltage:

Default
signal delay:

Maximum
off state current:

Terminal bases:

Backplane
current load:

Power
dissipation:

1794-IA8

120V ac

85-132V ac

on=8.6ms
off=26.6ms

2.9mA min

1794-TBN, -TB3,
-TB3S, -TB2

30mA

4.5W @ 132V ac

1794-IA8I

8
individually
isolated

120V ac

85-132V ac

on=8.6ms
off=26.6ms

2.9mA min

1794-TBN, -TB3,
-TB3S

30mA

4.5W @ 132V ac

1794-IA16

120V ac

74-132V ac

on-7.5ms
off=26.5ms

2.87mA min

1794-TBN, -TB3,
-TB3S

20mA

6.4W @ 132V ac

1794-IM8

220V ac

159-264

on=7.5ms
off=26.5ms

2.6mA min

1794-TBN

30mA

4.7W @ 264V ac

If you use a 1794-TBN terminal base with this I/O module, you’ll need auxiliary terminal strips.

Catalog
number:

Number of
inputs:

Voltage
category:

Operating
voltage:

Default signal
delay:

Maximum
off state current:

Terminal bases:

Backplane
current load:

Power
dissipation:

1794-IB8

8 sinking

24V dc

19.2-31.2V dc

256

1.5mA

1794-TB3, -TB3S

30mA

3.5W @ 31.2V dc

1794-IB8S

8 sinking

24V dc

19.2-31.2V dc

512

1.5mA

1794-TB3

30mA

4.0W @ 31.2V dc

1794-IB16

16 sinking

24V dc

19.2-31.2V dc

512

1.5mA

1794-TB3, -TB3S

30mA

6.1W @ 31.2V dc

1794-IV16

16 sourcing

24V dc

19.2-31.2V dc

256

1.5mA

1794-TB3, -TB3s

30mA

5.7W @ 31.2V dc

1794-
IB10XOB6

10 sinking

24V dc

19.2-31.2V dc

0.25ms

1.5mA

1794-TB3, -TB3S

35mA

6.0W @ 31.2V dc

1794-IC16

16 sinking

48V dc

30-60V dc

256

1.5mA

1794-TB3, -TB3S

25mA

6.4W @ 60V dc

This is a combination input and output module. See the entry for 1794-IB10XOB6 in the digital dc output modules table for its output specifications.

Catalog
number:

Number of
outputs:

Voltage
category:

Operating
voltage:

Maximum
current per
output:

Maximum
current per
module:

Terminal bases:

Backplane
current load:

Power
dissipation

1794-OA8

120V ac

85-132V ac

750mA @ 35

(5mA min)

1794-TBN, -TBNF,
-TB3, -TB3S

80mA

4.1W @ 0.5A
6.3W @ 0.75A
6.3W @ 1.0A

1794-OA8I

8
individually
isolated

120V ac

85-132V ac

750mA @ 35

(5mA min)

1794-TBN, -TBNF,
-TB3, -TB3S

80mA

4.1W @ 0.5A
6.3W @ 0.75A
6.3W @ 1.0A

1794-OA16

120V ac

74-132V ac

500mA @ 35

(50mA min)

1794-TBN

, -TB3,

-TB3S

80mA

4.7W @ 0.5A

1794-OM8

220V ac

159-264V ac

500mA @ 35

(50mA min)

1794-TBN

60mA

5.0W @0.5A

If you use a 1794-TBN terminal base with this I/O module, you’ll need auxiliary terminal strips.

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

1794 FLEX digital dc output module

1794 FLEX digital contact output modules

1797 FLEX Ex digital dc input modules

1797 FLEX Ex digital dc output module

Catalog
number:

Number of
outputs:

Voltage
category:

Operating
voltage:

Maximum
current per
output:

Maximum
current per
module:

Terminal bases:

Backplane
current load:

Power
dissipation

1794-OB8

8 sourcing

24V dc

19.2-31.2V dc

500mA
(1.0mA min)

1794-TBN, -TB3,
-TB3S

60mA

3.3W @ 31.2V dc

1794-OB8EP

8 sourcing

24V dc

19.2-31.2V dc

(1.0mA min)

10A

1794-TBN, -TB3,
-TB3S

73mA

5.5W @ 31.2V dc

1794-OB16

16 sourcing

24V dc

19.2-31.2V dc

500mA

(1.0mA min)

1794-TB3, -TB3s

80mA

5.3W @ 31.2V dc

1794-OB16P

16 sourcing

24V dc

19.2-31.2V dc

500mA
(1.0mA min)

1794-TB3, -TB3s

60mA

5.0W @ 31.2V dc

1794-OV16

16 sinking

24V dc

19.2-31.2V dc

500mA
(1.0mA min)

1794-TB3, -TB3S

80mA

4.2W @ 31.2Vdc

1794-OV16P

16 sinking

24V dc

19.2-31.2V dc

500mA
(1.0mA min)

1794-TB3, -TB3S

80mA

4.2W @ 31.2Vdc

1794-
IB10XOB6

6 sourcing

24V dc

19.2-31.2V dc

200mA
(1.0mA min)

20A

1794-TB3, -TB3S

35mA

6.0W @ 31.2V dc

1794-OC16

16 sourcing

48V dc

30-60V dc

500mA
(2.0mA min)

1794-TB3, -TB3S

80mA

3.7W @ 31.2V dc

This is a combination input and output module. See the entry for 1794-IB10XOB6 in the digital dc input modules table for its input specifications.

Catalog
number:

Number of
outputs:

Voltage
category:

Operating
voltage:

Maximum
current per
output:

Maximum
current per
module:

Terminal bases:

Backplane
current load:

Power
dissipation

1794-OW8

8 isolated

24V dc

5-240V dc

2A @ 240V ac
resistive

16A

1794-TBN, -TBNF,
-TB3, -TB3S

69mA

5.5W @ 31.2V dc

Catalog
number:

Number of
inputs:

Voltage
category:

Default signal
delay:

Maximum
off state current:

Terminal bases:

Power
consumption

Power
dissipation:

1797-IBN16

16 sinking

NAMUR
compatible
dc

1ms

1.2mA

1797-TB3, -TB3S

2.8W

2.9W

Catalog
number:

Number of
outputs:

Voltage
category:

Maximum
current per
output:

Maximum
current per
module:

Terminal bases:

Power
consumption:

Power
dissipation

1797-OB4D

4 sourcing

24V dc

45mA

180mA

1794-TB3, -TB3S

7.5W

5.0W

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

Analog I/O Modules

1794 FLEX analog modules

1797 FLEX Ex analog modules

Catalog
number:

Number of
inputs/outputs:

Voltage range:

Current range:

Terminal bases:

Backplane
current load:

External
power:

Power
dissipation:

1794-IE4XOE2

4 single-ended inputs
2 single-ended outputs

configurable

•

±10

•

0-10

configurable

•

4-20mA

•

0-20mA

1794-TB3, -TB3S,
-TB3T, -TB3TS,
-TB2

20mA

+24V dc
70mA

4.0W @ 31.2V dc

1794-IF2XOF2I

2 isolated inputs
2 isolated outputs

configurable

•

±10

•

0-10

•

±5

•

0-5

configurable

•

0mA

•

4-20mA

•

0-20mA

•

±20mA

1794-TBN, -TB3,
-TB3S, -TB3T,
-TB3TS

50mA

+24V dc
150mA

3.3W @ 31.2V dc

1794-IE8

8 single-ended inputs

configurable:

•

±10

•

0-10

configurable

•

4-20mA

•

0-20mA

1794-TB3, -TB3S,
-TB3T, -TB3TS,
-TB2

20mA

+24Vdc
60mA

3.0W @ 31.2V dc

1794-IF4I

4 isolated inputs

configurable

•

±10

•

0-10

•

±5

•

0-5

configurable

•

4-20mA

•

0-20mA

•

±20mA

1794-TBN, -TB3,
-TB3S, -TB3T,
-TB3TS

50mA

+24Vdc
60mA

2.0W @ 31.2V dc

1794-IRT8

8 single-ended
thermocouple or RTD
inputs

RTD sensors:
100

Ω

, 200

Ω

Platinum

100

Ω

, 120

Ω

, 200

Ω

Nickel

Ω

Copper

Thermocouple types:
B, E, J, K, TXK/XK, N, R, S, T

1794-TB3G,
-TB3GS

40mA

+24Vdc
85mA

3.0W @ 31.2V dc

1794-OE4

4 single-ended outputs

configurable

•

±10

•

0-10

configurable

•

4-20mA

•

0-20mA

1794-TBN, -TB3,
-TB3S, -TB3T,
-TB3TS, -TB2

20mA

+24V dc
70mA

4.5W @ 31.2V dc

1794-OF4I

4 isolated outputs

configurable

•

±10

•

0-10

•

±5

•

0-5

configurable

•

0mA

•

4-20mA

•

0-20mA

1794-TBN, -TB3,
-TB3S, -TB3T,
-TB3TS

50mA

+24V dc
70mA

4.7W @ 31.2V dc

Currently the 1794-IT8, and 1794-IR8 are not supported by RSLogix 5000 programming software.

Catalog
number:

Number of
inputs/outputs:

Voltage range:

Current range:

Terminal bases:

Backplane
current load:

External
power:

Power
dissipation:

1797-IE8

8 single-ended inputs

configurable

•

4-20mA

•

0-20mA

1797-TB3, -TB3S

5.2W

1797-IRT8

8 single-ended RTD or
thermocouple inputs

RTD sensors:
100

Ω

, 200

Ω

Platinum

100

Ω

, 120

Ω

, 200

Ω

Nickel

Ω

Copper

Thermocouple types:
B, E, J, K, TXK/XK, N, R, S, T

1797-TB3, -TB3S

5.4W

1797-OE8

8 single-ended outputs

15.5V dc in
digital mode

configurable

•

4-20mA

•

0-20mA

•

45mA digital
mode

1797-TB3, -TB3S

5.4W

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

Counter I/O modules

1794 FLEX counter modules

1797 FLEX Ex counter modules

Terminal Bases

Terminal bases provide backplane connections between the
controller and the I/O module and provide terminal connection
points for an I/O module.

1794 FLEX terminal bases

1797 FLEX Ex terminal bases

Catalog
number:

Number of inputs:

Number of outputs:

Terminal bases:

Backplane
current load:

External power:

Power
dissipation

1794-IJ2

a set of 2 digital inputs for
each of 2 channels

a digital output for each of 2
channels

1794-TB3G, -TB3GS

30mA

19.2-31.2V dc
180mA @ 24V dc

4.6W @ 31.2V dc

1794-VHSC

digital inputs for each of
2 counter registers

4 digital outputs (5V or
15-24V dc sourcing)

1794-TB3G, -TB3GS

75mA

19.2-31.2V dc
100mA @ 24V dc

5.0W @ 31.2V dc

Currently the 1794-IT8, and 1794-IR8 are not supported by RSLogix 5000 programming software.

Check with your Rockwell Automation representative for the availability date of support for the 1794-VHSC module in RSLogix 5000 programming software.

Catalog number:

Number of inputs:

Number of outputs:

Terminal bases:

External power:

Power
consumption:

Power
dissipation

1797-IJ2

a set of 2 digital NAMUR
inputs for each of 2
channels

a digital output for each of 2
channels

1797-TB3, -TB3S

< 9.5V dc

< 1A

= negligible

4.25W

Catalog number:

Number of terminals:

Special features:

Terminal type:

1794-TB2

none

screw cage

1794-TB3

none

screw cage

1794-TB3S

none

spring clamp

1794-TB3T

cold-junction-compensation connections for thermocouple inputs

screw cage

1794-TB3TS

cold-junction-compensation connections for thermocouple inputs

spring clamp

1794-TB3G

individual terminals for use with specific modules

screw cage

1794-TG3GS

individual terminals for use with specific modules

spring clamp

1794-TBN

cover for terminals

screw cage

1794-TBNF

fused connection points for the I/O with cover for terminals

screw cage

1203-FB1

required for the 1203-FM1 module

screw

Catalog number:

Number of terminals:

Special features:

Terminal type:

1797-TB3

none

screw cage

1797-TB3S

none

spring clamp

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

Extended-Local Adapter

The FlexLogix extended-local adapter lets you connect an additional DIN
rail of local I/O to the FlexLogix controller. The extended-local rail can
support as many as 8 I/O modules.

Description:

Value:

input voltage

rating
range

24V dc
19.2V to 31.2V dc (includes 5% ac ripple)

isolation voltage

tested to 850V dc for 1 second between user power and FlexBUs

FlexBus output current

653mA maximum @ 5.1V dc

power consumption

6W (250mA) maximum from external 24V dc power supply

power dissipation

7.5W maximum @ 19.2V

thermal dissipation

25.6BTU/hour @ 19.2V

environmental conditions

operating temperature
storage temperature
relative humidity
operating shock
storage shock
vibration

0° to 60° C(32 to 140° F)
-40° to 85° C(-40 to 185° F)
5% to 95% noncondensing
30G peak for 11ms
50G peak for 11ms
5.0g b@ 10-500Hz per IEC 68-2-6

To maintain these specifications, you must use DIN rail locks.

weight

0.28 kg (0.62 lbs.)

power supply

1794-PS1 or 1794-PS13
In applications that must be compliant with CSA requirements, use a
Separated Extra-Low Voltage (SELV) power supply that is compliant with
IEC 61010.1, Annex H

power conductors

60° C (140° F) minimum, copper
22-12 AWG (4 mm

) stranded

3/64 inch (1.2mm) insulation maximum
length 3m or less
category 3

(1)

extended local I/O cable

1794-CE1 cable (1 foot)
1794-CE3 cable (3 feet)
category 3

(1))

Agency Certifications
When product is marked:

industrial control equipment

marked for all applicable directives

Class I Division 2 Hazardous

CSA certification - Class I, Division 2, Group A,B,C,D or nonhazardous locations

marked for applicable acts

N223

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

Placing FLEX I/O Modules in a
FlexLogix System

The FlexLogix controller supports a local DIN rail of as many as
8 I/O modules and an extended-local DIN rail of as many as
8 I/O modules. The second DIN rail is optional.

When you create a project for a FlexLogix controller, the
Controller Organizer for that project automatically displays both
the local DIN rail and the extended DIN rail. If you do not use
the extended-local DIN rail, inhibit that rail.

You must configure an RPI rate for each DIN rail. This rate
applies to the I/O modules you install on the DIN rail.

If you have a mix of analog and digital I/O modules, place the
digital I/O modules on one DIN rail and place the analog I/O
modules on the second DIN rail. You can then configure a faster
RPI for the digital I/O and a more appropriate RPI for the analog
I/O without impacting the digital I/O. The fastest RPI possible
for a rail depends on the modules on that rail.

local DIN rail

extended-local DIN rail
(using a 1794-FLA adapter)

If you have:

The fastest possible RPI is:

one rail of digital I/O modules

2 ms

one rail of analog I/O modules

5 ms

one rail of digital and I/O modules mixed

5 ms

first rail of digital I/O modules
and
second rail of analog I/O modules

2 ms for the first rail
and
5 ms for the second rail

first rail of digital I/O modules
and
second rail of digital I/O modules

2 ms for the first rail
and
5 ms for the second rail

first rail of digital and analog I/O modules mixed
and
second rail of digital and analog I/O modules mixed

5 ms for the first rail
and
5 ms for the second rail

Selecting FLEX I/O Modules

1794-SG001A-EN-P July 2000

How FLEX I/O Modules
Operate

The FlexLogix system follows a producer/consumer model. Input
modules produce data for the system. Controllers, output modules,
and intelligent modules produce and consume data. The
producer/consumer model multicasts data. This means that multiple
nodes can consume the same data at the same time from a
single device.

The controller continually scans the control logic. One scan is the time
it takes the controller to execute the logic once. Input data transfers to
the controller and output data transfers to output modules
asynchronous to the logic scan.

Selecting Controller
Ownership

Every I/O module in the Logix system must be owned by a controller.
The owner controller stores configuration data for every I/O module
that it owns and can be local or remote in regard to the I/O module’s
position. The owner controller sends the I/O configuration data to
define the I/O module’s behavior and to start the I/O module’s
operation within the control system. Each I/O module must
continuously maintain communication with its owner controller to
operate normally.

Because of the distributed nature of a FlexLogix system, the FlexLogix
controller must own its local I/O modules. No other Logix controller
can listen to or own the local FlexLogix I/O. The FlexLogix controller
must produce its local I/O data for any other controller to consume.
The listen-only format works for remote I/O only.

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

Planning Network Communications

Interfacing with communication networks is modular, except for
the RS-232 serial (DF1 protocol) port built into the FlexLogix
controller. Separate network communication cards are available
for interfacing the controller with ControlNet networks.

You determine your communication architecture based on your
networking needs. There are three main types of networks:

Information networks

An information network:

•

provides a link between the plant floor and the
manufacturing systems

•

connects to multiple vendor’s host computers

•

has the capacity to transfer large data files

•

supports standard network management and
troubleshooting tools

Control networks

A control network:

•

offers real-time performance

•

is deterministic and repeatable

•

supports peer-to-peer messaging

•

connects to programmable controllers, personal
computers, man-machine interface devices, drives, motion
devices, etc.

•

support programming and device configuration

Device networks

A device network:

•

reduces wiring costs because devices do not need to be
directly wired to a programmable controller

•

supports device-level diagnostics

•

connects to multiple vendors’ devices

A FlexLogix controller communicates across the DIN rail with
I/O modules on the local rail and on the extended-local rail. A

41760

41761

41762

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

FlexLogix controller can also communicate through a communication
card to monitor and control I/O on ControlNet networks. General
communication messages can be sent from or received by FlexLogix
controllers across ControlNet and RS-232 serial networks.

The FlexLogix system is designed to control distributed applications,
not bridge data across networks. The FlexLogix controller supports
only one connected and one unconnected MSG to a device on
another network. Control performance degrades significantly if you
use the FlexLogix system as a bridge. Instead, use a
ControlLogix Gateway.

You select the communication card for the network that meets
your needs:

If your application requires:

Use this network:

Type:

•

high-speed transfer of time-critical data between controllers

and I/O devices

•

deterministic and repeatable data delivery

•

program maintenance

•

media redundancy or intrinsic safety options

ControlNet network
see page 27

control and information
network

•

modems

•

supervisory control and data acquisition (SCADA)

serial network
see page 29

serial network

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

ControlNet Network

The ControlNet network is an open, high-speed, and
deterministic network used for transmitting time-critical
information. It provides real-time control and messaging services
for peer-to-peer communication. As a high-speed link between
controllers and I/O devices, a ControlNet network combines the
capabilities of existing Universal Remote I/O and DH+ networks.
You can connect a variety of devices to a ControlNet network,
including personal computers, controllers, operator interface
devices, drives, I/O modules, and other devices with ControlNet
connections.

At the control layer, a ControlNet network combines the
functionality of an I/O network and a peer-to-peer messaging
network. This open network provides the performance required
for critical control data, such as I/O updates and
controller-to-controller interlocking. ControlNet also supports
transfers of non-critical data, such as program uploads,
downloads, and messaging.

1788-CNx ControlNet statistics

workstation running
programming software
with 1784-KTCx

ControlNet

ControlLogix Gateway or
Logix5550 controller

PLC-5/40C controller

1395 drive

PanelView 1200
operator terminal

FlexLogix controller with
1788-CNCR card

Rates:

Cable lengths:

Maximum number
of nodes:

transmission: 5 Mbps
network update time: 2-100ms

1000m (3,280 ft.) with 2 devices
250m (820 ft.) with a maximum of 48 devices
tap drop cable length fixed at 1m (3 ft.)
maximum distance 6km with repeaters

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

1788-CNC, -CNCR ControlNet communication card

The ControlNet communication card links the FlexLogix controller to
other devices on a ControlNet network. The ControlNet
communication card also provides access for the FlexLogix controller
to monitor and control I/O modules located remotely from the
controller on the ControlNet network.

You install the ControlNet communication card directly into the
FlexLogix controller.

Description:

Value:

communication rate

5 Mbps

connections

16 connections per module

cable

RG-6 coaxial cable
1786-RG6 (shield high flex cable)
1786-RG6F (quad shield high flex coax cable)

termination resistor

1786-XT

tap

Choose:

•

1786-TPR (T-tap right angle)

•

1786-TPS (T-tap straight)

•

1786-TPYR (Y-tap right angle)

•

1786-TPYS (Y-tap straight)

The straight taps are recommended.

backplane current

640mA @ 5V dc
3.26W

conductor category

operating temperature

0° to 60° C (32 to 140° F)

storage temperature

-40° to 85° C (-40 to 185° F)

relative humidity

5% to 95% noncondensing

vibration

10 to 150 Hz
5.0 G maximum peak acceleration

operating shock

30G peak for 11ms

storage shock

50G peak for 11ms

weight

1788-CNC

0.08 kg (0.19 lb)

1788-CNCR

0.10 kg (0.22 lb)

agency certification

CSA certification - Class I Division 2, Group A, B, C, D or nonhazardous locations.

Class I Division 2 Hazardous

marked for all applicable directives

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

Serial Network

The FlexLogix serial port is a non-isolated port that provides
RS-232 serial communications. You select the serial protocol:

The RS-232 port is a non-isolated serial port built-in to the front
of the FlexLogix controller.

Use this serial protocol:

For:

DF1 point to point

communication between a controller and other DF1-compatible devices using
DF1 full-duplex protocol

DF1 master

control of polling and message transmission between the master and each slave
using DF1 half-duplex polled protocol.

DF1 slave

using the controller as a slave station in a master/slave serial network using
DF1 half-duplex protocol.

user mode (ASCII)

communication between a controller and an ASCII device, such as a bar code reader

modem

RS-232

Ethernet

modem

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

The FlexLogix controller is grounded through its DIN rail and its
grounding stud. It is important that you understand the workstation’s
grounding system before connecting it to the controller. An isolator is
recommended between the controller and the workstation.

1. Determine whether you need an isolator.

If you connect the controller to a programming workstation,
modem, or ASCII device, consider installing an isolator between
the controller and the end device.

One possible isolator is the 1761-NET-AIC interface converter.

port 1: DB-9 RS-232, DTE

baud rate selector switch

port 2: mini-DIN 8 RS-232

dc power source selector switch

terminals for external 24V dc power supply

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

2. Select the appropriate cable.

If you are using an isolator:

Use this cable:

yes

The 1761-CBL-AP00 cable (right-angle bend connector to controller) or the 1761-CBL-PM02 cable
(straight connector to the controller) attaches the controller to port 2 on the 1761-NET-AIC isolator.
The 8-pin mini-DIN connector is not commercially available, so you cannot make this cable.

The 1756-CP3 cable attaches the controller directly to the RS-232 device.

If you make your own cable, it must be shielded and the shields must be tied to the metal shell
(that surrounds the pins) on both ends of the cable.

You can also use a 1747-CP3 cable from the SLC product family. This cable has a larger right-angle
connector than the 1756-CP3 cable.

1 2

6 7 8

DB-9 right-angle or
straight cable end

8-pin, mini-DIN cable
end

Pin:

DB-9 end:

Mini-DIN end:

DCD

RxD

TxD

DTR

ground

DSR

RTS

CTS

2 RDX

3 TXD

4 DTR

COMMON

6 DSR

7 RTS

8 CTS

1 CD

2 RDX

3 TXD

4 DTR

COMMON

6 DSR

7 RTS

8 CTS

1 CD

straight cable end

right-angle cable end

Planning Network Communications

1794-SG001A-EN-P July 2000

Ethernet

Contr

olNet

DeviceNet

If you connect the controller to a modem or an ASCII device, install
the optical isolator between the controller and end device.

Consider installing an optical isolator if you use the serial port to
directly connect a programming workstation to the controller.

modem

optical isolator
1761-NET-AIC

24 V dc

user-supplied modem cable

1761 cable

isolator
(recommended)

workstation

Selecting a Controller

1794-SG001A-EN-P July 2000

Selecting a Controller

The FlexLogix controller is part of the Logix architecture. The
FlexLogix controller provides a distributed control system built
on these components:

•

FlexLogix controller that supports the Logix instructions.

•

RSLogix 5000 programming software.

•

FLEX I/O modules that provide a compact, DIN-rail
mounted I/O system.

•

1788 communication card that provides communication
over a standards-based ControlNet network.

The FlexLogix controller
supports FLEX I/O modules.

1788 communication card installs directly
in the FlexLogix controller.

The FlexLogix extended-local adapter allows a
second DIN rail for FLEX I/O modules.

The same RSLogix 5000 programming
software supports program development
for all Logix controllers.

Selecting a Controller

1794-SG001A-EN-P July 2000

1794 FlexLogix Controller

Category:

FlexLogix controller (1794-L33, -L34)

available user memory

Available user memory is the amount of memory available to the user after RSLogix 5000 programming
software is connected and a null program is loaded.

1794-L33 64 KBytes
1794-L34 512 KBytes

input voltage

rating
range

24V dc
19.2V to 31.2V dc (includes 5% ac ripple)

isolation voltage

tested to 850V dc for 1 second between user power and FlexBus

FlexBus output current

653mA maximum @ 5.1V dc

power consumption

20.4W (850mA) maximum from external 24V dc power supply

power dissipation

25.5W maximum @ 19.2V

thermal dissipation

87BTU/hour @ 19.2V

environmental conditions

operating temperature
storage temperature
relative humidity
operating shock
storage shock
vibration

0° to 60° C(32 to 140° F)
-40° to 85° C(-40 to 185° F)
5% to 95% noncondensing
30G peak for 11ms
50G peak for 11ms
5.0g b@ 10-500Hz per IEC 68-2-6

To maintain these specifications, you must use DIN rail locks.

weight

1794-L33 0.71 kg (1.56 lbs.)
1794-L34 0.75 kg (1.66 lbs.)
(no communication cards installed)

power supply

1794-PS1 or 1794-PS13
In applications that must be compliant with CSA requirements, use a
Separated Extra-Low Voltage (SELV) power supply that is compliant with IEC
61010.1, Annex H

power conductors

60° C (140° F) minimum, copper
22-12 AWG (4 mm

) stranded

3/64 inch (1.2mm) insulation maximum
length 3m or less
category 3

(1)

battery

1756-BA1 (PROMARK Electronics 94194801)
0.59g lithium

serial cable

1761-CBLPM02 to 1761-NET-AIC isolator
1761-CBLPA00 to 1761-NET-AIC isolator
1756-CP3 directly to controller
1747-CP3 directly to controller
category 3

See the

Industrial Automation Wiring and Grounding Guidelines

, publication 1770-4.1.

extended local I/O cable

1794-CE1 cable (1 foot)
1794-CE3 cable (3 feet)
category 3

(1))

Agency Certifications
When product is marked:

industrial control equipment

marked for all applicable directives

Class I Division 2 Hazardous

CSA certification - Class I, Division 2, Group A,B,C,D or nonhazardous locations

marked for applicable acts

N223

Selecting a Controller

1794-SG001A-EN-P July 2000

Controller tasks

_____ * 4000 = _____ bytes (minimum 1 needed)

Digital I/O points

_____ * 400

= _____ bytes

Analog I/O points

_____ * 2600 = _____ bytes

Communication modules_____ * 5000= _____ bytes

Motion axis

_____ * 8000 = _____ bytes

Total=_____ bytes

1756-BA1 Battery

The FlexLogix controller comes with one 1756-BA1 battery:

Order a battery if you need a spare or a replacement.

Description:

Value:

battery

1756-BA1
0.59g lithium

top

red lead (+)

middle

black lead (-)

bottom

no connection

Selecting a Controller

1794-SG001A-EN-P July 2000

How the FlexLogix System
Uses Connections

The FlexLogix system uses a connection to establish a communication
link between two devices. This includes controllers, communication
modules, input/output modules, produced/consumed tags, and
messages. Connections take many forms:

•

controller direct to local I/O modules or local communication
daughtercards

•

controller direct to remote I/O or remote communication
modules

•

controller to remote I/O (rack optimized) modules

•

produced and consumed tags

•

messages

You indirectly determine the number of connections that the
controller requires by configuring the controller to communicate with
other devices in the system.

Each module in the FlexLogix system supports a limited number of
active connections. Take these connection limits into account when
designing your system. These modules support these number
of connections:

Device:

Description:

Possible Connections per Module:

1794 I/O modules

FLEX I/O modules

1 connection per module

1788-CNC
1788-CNCR

ControlNet communication
daughtercard

12 connections

1756-CNB
1756-CNBR

ControlLogix ControlNet
communication module

64 connections

1794-ACN15
1794-ACNR15

FLEX ControlNet adapter
module

9 connections

Selecting a Controller

1794-SG001A-EN-P July 2000

Use the following table to tally the connection requirements for
a controller:

Determining Connections for
Produced and Consumed Tags

The FlexLogix controller supports the ability to produce
(broadcast) and consume (receive) system-shared tags over a
ControlNet link. Produced and consumed data is accessible by
multiple controllers over a ControlNet network. Produced and
consumed data are scheduled connections because the
controller sends or receives data at a predetermined rate.

Produced and consumed tags must be controller-scoped tags of
DINT or REAL data type, or in an array or structure.

The producer and consumer must be configured correctly for
the specified data to be shared. A produced tag in the producer
must be specified exactly the same as the consumed tag in
the consumer.

Connection Type:

Device
Quantity:

Connections
per Device:

Total
Connections:

rack-optimized connection to DIN rail

2 rails

local I/O module (direct connection)

remote I/O module (direct connection)

1788-CNC, -CNCR ControlNet communication card

remote ControlNet communication device (such as a
1794-ACN15, -ACNR15 or 1756-CNB module)

configured as a direct (none) connection
configured as a rack-optimized connection

0 or
1

remote 1785 ControlNet PLC-5 controller

produced tag

produced tag to one consumer

number of additional consumers

consumed tags

messages

total:

Tag type:

Description:

Specify:

produced

These are tags that the controller
produced for other controllers to
consume.

•

Enabled for producing

•

How many consumers allowed

consumed

These are tags whose values are
produced by another controller.

•

Controller name that owns the tag that the local controller wants
to consume

•

Tag name or instance that the controller wants to consume

•

Data type of the tag to consume

•

Update interval of how often the local controller consumes the tag

Selecting a Controller

1794-SG001A-EN-P July 2000

Maximum number of produced and consumed tags

The maximum number of produced/consumed tags that you can
configure depends on the connection limits of the communication
device that transfers the produced/consumed data.

Determining Connections
for Messaging

Some messages use a connection to send or receive data. Some
messages also have the option of leaving the connection open (cache)
or closing the connection when the message is done transmitting. The
following table shows which messages use a connection and whether
or not you can cache the connection:

Message instructions that execute repeatedly should keep the
connection open to optimize execution time. Opening a connection
each time to execute an instruction would increase execution time.
Message instructions that operate infrequently can close connections
upon completion to free up connections for other uses. Use the
following table to select a cache option for a message.

Important:

For two controllers the share produced or consumed tags,
both controllers must be attached to the same ControlNet
network. You cannot bridge produced and consumed tags
between two networks.

This type of message:

Using this
communication method:

Uses a
connection:

Which you
can cache:

CIP data table read or write

CIP

✓

PLC2, PLC3, PLC5, or SLC
(all types)

CIP

CIP with Source ID

DH+

✓

CIP generic

N/A

block-transfer read or write

N/A

✓

If the message
executes:

Then:

Because:

repeatedly

Select the Cache Connections
check box

This will keep the connection open and optimize
execution time. Opening a connection each time the
message executes increases execution time.

infrequently

Clear the Cache Connections
check box

This will close the connection upon completion, which
frees up that connection for other uses.

Selecting a Controller

1794-SG001A-EN-P July 2000

Determining Connections for
I/O Modules

For the FlexLogix controller to send or receive information from
I/O modules, a communication link, or connection, must be
established from the controller to the module. The controller
establishes a communication connection to an I/O module
either directly or indirectly by communicating to a
communication module in the system. A direct connection
occurs when the controller establishes a real-time, data-transfer
link directly with the module. A direct connection lets you tailor
the system to meet specific timing or information needs of
certain modules. Direct connections provide the greatest system
flexibility, but require extra system bandwidth and capacity.

In addition to direct connections, a communication module or
adapter can consolidate the data for multiple, digital I/O
modules, in the same chassis as the communication module,
into a single, rack-optimized connection. With a rack-optimized
connection, the controller establishes a single connection to a
communication module or adapter. The communication module
or adapter then establishes a connection to each of the
appropriate modules. By doing this, the communication module
or adapter reduces the:

•

number of message packets that must be sent on the
network

•

amount of processing time required by each module and
controller receiving the information

•

system communications overhead and capacity needs

•

number of connections used by the controller

The FlexLogix controller automatically assigns one
rack-optimized connection for the local DIN rail and one
rack-optimized connection for the extended-local DIN rail. You
then configure each I/O module on a DIN rail to either use that
rack-optimized connection or to use a direct connection. The
rack-optimized connection for each DIN rail exists whether or
not you configure the I/O modules to use that rack-optimized
connection.

The rack-optimized connection lets you organize all the digital
I/O modules on one DIN rail into one connection to the
controller. Or you can choose to configure each I/O module to
have a direct connection to the controller. Analog I/O modules
must have a direct connection to the controller.

Selecting a Controller

1794-SG001A-EN-P July 2000

Direct connections for I/O modules

A direct connection is a real-time, data transfer link between the
controller and an I/O module. The controller maintains and monitors
the connection between the controller and the I/O module. Any break
in the connection, such as a module fault or the removal of a module
while under power, causes the controller to set fault status bits in the
data area associated with the module.

In this example, assume that each I/O module is configured for a
direct connection to the controller.

The following table calculates the connections in this example.

Connection:

Amount:

FlexLogix controller 3 to local I/O modules

rack-optimized connection for the DIN rail
direct connection for each I/O module

1
3

FlexLogix controller 2 to extended-local I/O modules

rack-optimized connection for the DIN rail
direct connection for each I/O module

1
2

total connections used: 7

Selecting a Controller

1794-SG001A-EN-P July 2000

Rack-optimized connections for I/O modules

For each digital I/O module on the local or the extended-local
DIN rail, you can select rack optimized communication. A rack
optimized connection consolidates connection usage between
the controller and all the digital I/O modules on a DIN rail.
Rather than having individual, direct connections for each I/O
module, there is one connection for the entire DIN rail.

In this example, assume that each I/O module is configured for
a rack-optimized connection to the controller.

The following table calculates the connections in this example.

The rack optimized connection conserves connections, but it
limits the status and diagnostic information that is available from
the I/O modules.

Connection:

Amount:

FlexLogix controller 3 to local I/O modules

rack-optimized connection for the DIN rail

FlexLogix controller 2 to extended-local I/O modules

rack-optimized connection for the DIN rail

total connections used: 2

Selecting a Controller

1794-SG001A-EN-P July 2000

Mixing direct and rack-optimized connections

A DIN rail can have both a rack-optimized connection and direct
connections. In this example, assume that the I/O modules in slot 0
and slot 1 on the local rail are configured for a rack-optimized
connection and that the I/O module in slot 2 is configured for a direct
connection. Also, assume that the I/O modules on the extended-local
DIN rail are analog I/O modules, so each module requires a direct
connection.

The following table calculates the connections in this example.

Connection:

Amount:

FlexLogix controller 3 to local I/O modules

rack-optimized connection for the DIN rail
direct connection for one I/O module (slot 2)

1
1

FlexLogix controller 2 to extended-local I/O modules

rack-optimized connection for the DIN rail
direct connection for each I/O module

1
2

total connections used: 5

Selecting a Controller

1794-SG001A-EN-P July 2000

Communicating with
I/O Products

In addition to 1794 and 1797 I/O modules, the FlexLogix
controller can communicate with and control other types of I/O
products. The following table lists the I/O products the
FlexLogix controller can control over which networks:

I/O Product:

ControlNet
network:

RS-232 (DF1)
serial link:

ControlLogix I/O (1756 series)

yes

SLC I/O (1746 series)

limited

Compact I/O (1769 series)

Block I/O (1791 series)

ArmorBlock I/O (1792 series)

Flex Integra I/O (1793 series)

Flex I/O (1794 series)

yes

Flex EX I/O (1797 series)

yes

1771 I/O

yes

PanelView terminals (2711 series)

yes

RediPANEL modules (2705 series)

Dataliners (2706 series)

DTAM (2707 series)

yes

Selecting a Controller

1794-SG001A-EN-P July 2000

Communicating with
Other Controllers and
Devices

The FlexLogix system takes advantage of several networks to allow
communications with many different controllers and devices. The
following table lists which products the FlexLogix controller can
communicate with over which networks.

The FlexLogix controller can
communicate with a:

ControlNet
network:

RS-232 (DF1)
network:

1756 ControlLogix controller

yes

1794 FlexLogix controller

yes

1785 PLC-5 controller

yes

1747 SLC controller

yes

MicroLogix controllers

n/a

yes

1772 PLC-2 controller

n/a

yes

The PLC-2 controller requires a 1771-KG module for serial (DF1) communications.

1775 PLC-3 controller

n/a

yes

The PLC-3 controller requires a 1775-KA module for serial (DF1) communications.

5250 PLC-5/250 controller

n/a

yes

2711 PanelView

limited

9355 RSLinx software

yes

1784-KTC, -KTCx

yes

n/a

1784-KT, -KTx

n/a

1784-PCC

yes

You need a 1784-PCC1 cable.

n/a

1784-PCD

n/a

1784-PCMK

n/a

1788-CNC, -CNCR

yes

n/a

Selecting a Power Supply

1794-SG001A-EN-P July 2000

Selecting a Power Supply

In a FlexLogix system, select an Allen-Bradley power supply. In
applications that must be compliant with CSA requirements, use
a Separated Extra-Low Voltage (SELV) power supply that is
compliant with IEC 61010.1, Annex H

1794 FLEX power supply

The FLEX power supply is the Allen-Bradley offering for the
FlexLogix system.

Description:

1794-PS13

nominal input voltage

120/230V ac

input voltage range

85-265V ac

frequency

47-63 Hz

maximum real input power

36W

maximum apparent input power

53VA

maximum transformer load

90VA

output current

1.3A @ 24V dc

dimension (H x W x D)

87H x 68W x 69D mm
(3.4H x 2.7W x 2.7D in)

weight

0.2 kg (0.5 lb)

operating temperature

-0° to 55° C (32 to 131° F)

storage temperature

-40° to 85° C (-40 to 185° F)

relative humidity

5 to 95% (without condensation)

operating shock

30g peak acceleration, 11 (±1)ms pulse width

storage shock

50g peak acceleration, 11 (±1)ms pulse width

vibration

tested 5g @ 10-500 Hz per IEC 68-2-6

output
current load
(Amps)

1.5

1.2
0.9

0.6

0.3

0.0

100

1.5

1.2
0.9

0/6

0.3

0.0

1.5

1.2
0.9

0/6

0.3

0.0

real power (Watts)

apparent power (Watts)

transformer load (VA) =
real power (Watts) x 2.5

1794-PS13
ac/dc

Selecting a Power Supply

1794-SG001A-EN-P July 2000

1797 FLEX Ex power supplies

The intrinsically safe power supplies convert unsafe 24V dc power
into intrinsically safe power in an hazardous location.

FLEX Ex power supply:

Description:

1797-PS2N

24V dc in/quad-Ex dc out power supply in an explosion-proof
enclosure with 1-inch conduit pipe-thread input/output terminations

1797-PS2E

24V dc in/quad-Ex dc out power supply in a flame-proof enclosure
with increased safety input/output terminations

Description:

1797-PS2N

1797-PS2E

input voltage

24 (19-32)V dc, 5% ripple

input power entrance

1-in NPT

increased safety

maximum output power

8.5W each at 4 outputs

input power consumption

55W

power dissipation

21W

dimension (H x W x D)

174H x 174W x 128D mm
(6.9H x 6.9W x 5.04D in)

174H x 174W x 280D mm
(6.9H x 6.9W x 11.0D in)

protection class

IP 66/NEMA 7B

IP 65/NEMA 7B

weight

7.3 kg (16 lb)

7.7 kg (17 lb)

operating temperature

-20° to 70° C (4 to 158° F)

storage temperature

-40° to 85° C (-40 to 185° F)

relative humidity

5 to 95% (without condensation)

operating shock

15g peak acceleration, 11 (±1)ms pulse width

storage shock

15g peak acceleration, 11 (±1)ms pulse width

vibration

tested 2g @ 10-500 Hz per IEC 68-2-6

After the conductors are routed through the conduit, a seal must be formed at the power supply port.

Planning the DIN Rails

1794-SG001A-EN-P July 2000

Planning the DIN Rails

You horizontally or vertically mount the FlexLogix system on
steel, 35 x 7.55mm DIN rails (A-B part number 199-DR1;
46277-3; EN 50022). The DIN rails for all FlexLogix system
components, including all local and extended-local I/O
modules, must be mounted on a common, conductive surface to
ensure proper electromagnetic interference (EMI) performance.

Use the optional 1794-CE1 (0.3m, 1ft) or 1794-CE3 (0.9m, 3ft)
extender cable to add an extended-local rail of I/O to the
controller. You can have as many as eight I/O modules on the
local rail and eight modules on the extended-local rail.

local rail

extended-local rail
requires 1794-FLA adapter

Planning the DIN Rails

1794-SG001A-EN-P July 2000

Dividing I/O modules across DIN rails

Use the optional 1794-CE1 (0.3m, 1ft) or 1794-CE3 (0.9m, 3ft) extender
cable to arrange your system in two rows or split your system into
horizontal and vertical orientation. The cable can be used between
any module or adapter.

Module 0

Module 1

Module 2

Module 3

Module 4

Module 5

Module 6

Module 7

1794-CE1

1794-CE3

cable

Module 0

Module 1

Module 2

Module 3

Module 4

Module 5

Module 6

Module 7

1794-CE1

1794-CE3

cable

1794-CE1

1794-CE3

cable

Selecting Software

1794-SG001A-EN-P July 2000

Selecting Software

Your selection of modules and network configuration
determines what software packages you need to configure and
program your system.

If you have a:

You need:

Order this catalog number:

1794 FlexLogix controller

RSLogix 5000 programming software

9324 series
(RSLogix 5000 programming software)

1788-CNC, -CNCR ControlNet
communication card

RSNetWorx for ControlNet
(comes with RSLogix 5000 programming software
and RSNetWorx for ControlNet bundle)

9324-RLD300NXENE (RSLogix 5000 programming
software plus RSNetWorx option)
or
9357-CNETL3

communication card in a
workstation

RSLinx software
(comes with RSLogix 5000 programming software)

9324 series
(RSLogix 5000 programming software)

workstation dedicated for
operator interface

RSView32 software

9301 series

PanelView terminal

PanelBuilder software

2711-ND3 for PanelBuilder 900
or
2711E-ND1 for PanelBuilder 1400e

Selecting Software

1794-SG001A-EN-P July 2000

Programming Software

RSLogix 5000 programming software is IEC 1131-3 compliant software
that supports the FlexLogix controller. Operating on Microsoft’s
Windows NT 32-bit operating system, the software maximizes
performance, saves development time, and improves productivity.
RSLogix 5000 is part of the RSLogix family of software products,
offering the same reliable functionality. RSLogix 5000 programming
software also includes axis configuration and programming support
for motion control. One hardware and software platform is all you
need for your combined sequential and motion needs.

Select the programming package based on the functionality you need:

This catalog number:

Includes this functionality

9324-RLD300

•

standard programming software (relay ladder logic)

9324-RLD300NXENE

•

standard programming software (relay ladder logic)

•

RSNetWorx for ControlNet and DeviceNet software

Description:

Value:

personal computer

IBM-compatible Pentium 90 MHz or greater

software requirements

Microsoft Windows NT version 4.0 with Service Pack 4
RSLinx software must be installed

RAM

32 Mbytes of RAM minimum
64 Mbytes of RAM recommended

hard disk space

40 Mbytes of free hard disk space
(or more based on application requirements)

video requirements

16-color VGA graphics adapter
640 x 480 or greater resolution
(256-color 800 x 600 minimum for optimal resolution)

Selecting Software

1794-SG001A-EN-P July 2000

Network Configuration
Software

RSNetWorx software for ControlNet (9357-CNETL3) is the
configuration and scheduling tool for your ControlNet network.
RSNetWorx software lets you create a graphical representation of
your network configuration and configure the parameters that
define your network.

RSNetWorx software also performs a scheduling function for all
network components. For example, each network scanner has
its own scan list and memory mapping. This information is
stored in the configurations files in the scanner. When changes
are made to the scan lists, RSNetWorx software automatically
calculates network bandwidth for the entire network, as well as
the bandwidth used by each network component.

You must have RSNetWorx software to configure and schedule
the ControlNet networks in your FlexLogix system.

ControlLogix, Logix5550, FlexLogix, ProcessLogix, PLC-5, PLC-3, PLC-2, SLC, DH+, Allen-Bradley, RSLogix, RSNetWorx, and
Rockwell Software are trademarks of Rockwell Automation.

ControlNet is a trademark of ControlNet International, Ltd.

DeviceNet is a trademark of the Open DeviceNet Vendor Association.

Ethernet is a trademark of Digital Equipment Corporation, Intel, and Xerox Corporation.

ControlNET

A # 2 4

ControlNET

A # 2 4

ControlNET

A # 2 4

ControlNET

A # 2 4

ControlNET

A # 2 4

PLC-5/40C

Description:

Value:

personal computer

IBM-compatible 120MHz minimum (Pentium recommended)

operating system

Microsoft Windows 95, Windows 98, or
Windows NT version 4.0 (with Service Pack 2 or later)

RAM

32 Mbytes of RAM minimum
48 Mbytes or more of RAM recommended

hard disk space

14 Mbytes of free hard disk space
(or more based on application requirements)

video requirements

16-color VGA graphics adapter
640 x 480 or greater resolution
(256-color 800 x 600 minimum for optimal resolution)

Publication 1794-SG001A-EN-P—July 2000

PN 957293-37

FlexLogix selguide cov.qxd 7/12/00 1:16 PM Page 1

Document Outline

Rockwell Automation Catalogs on CD
1794-SG001A-EN-P, FlexLogix Selection Guide
Introducing FlexLogix
FlexLogix System Overview
Example FlexLogix System
Selecting FLEX I/O Modules
Planning Network Communications
- ControlNet Network
- Serial Network
Selecting a Controller
Selecting a Power Supply
Planning the DIN Rails
Selecting Software
- Programming Software
- Network Configuration Software
Back Cover

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