Rockwell Automation 1791R-XXXX User Manual

Installation Instructions

Compact

Block

Distributed I/O on

Remote I/O

(Cat. No. 1791R-16B0, -0B16P, -8B8P, -4B4P, -8V8P)

1791R CompactBlock™ I/O modules are stand-alone 24V dc Block
I/O products that communicate via a Remote I/O link. Each Remote
I/O node consists of either one base module or one base module and
one expansion module. Any expansion module can be coupled with
any base module. CompactBlock 1791R consists of only base
modules. The expansion modules are part of the CompactBlock
1791D family of products.

CompactBlock Remote I/O modules must be installed in a secondary
enclosure. Base modules are equipped with 8 to 16 points.

CompactBlock Remote I/O provides both sinking and sourcing
inputs and outputs. Sinking inputs are 24V dc NEMA Type 3
compatible. Self-protected 24V dc outputs can provide up to 0.5 amp
each.

Important User Information

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of these
products must satisfy themselves that all necessary steps have been
taken to assure that each application and use meets all performance
and safety requirements, including any applicable laws, regulations,
codes and standards. In no event will Allen-Bradley be responsible or
liable for indirect or consequential damage resulting from the use or
application of these products.

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2 CompactBlock Distributed I/O on Remote I/O

WARNING

!

ATTENTION

!

Any illustrations, charts, sample programs, and layout examples
shown in this publication are intended solely for purposes of
example. Since there are many variables and requirements associated
with any particular installation, Allen-Bradley does not assume
responsibility or liability (to include intellectual property liability) for
actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the

Application, Installation and Maintenance of Solid-State Control

(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in
whole or part, without written permission of Rockwell Automation, is
prohibited.

Throughout this publication, notes may be used to make you aware
of safety considerations. The following annotations and their
accompanying statements help you to identify a potential hazard,
avoid a potential hazard, and recognize the consequences of a

potential hazard:

Identifies information about practices or
circumstances that can cause an explosion in a
hazardous environment, which may lead to
personal injury or death, property damage, or
economic loss.

Publication 1791R-IN001A-EN-P - February 2002

Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage, or economic loss.

CompactBlock Distributed I/O on Remote I/O 3

IMPORTANT

ATTENTION

!

Identifies information that is critical for
successful application and understanding of the
product.

Environment and Enclosure

This equipment is intended for use in a Pollution
Degree 2 industrial environment, in overvoltage
Category II applications (as defined in IEC
publication 60664-1), at altitudes up to 2000
meters without derating.

This equipment is considered Group 1, Class A
industrial equipment according to IEC/CISPR
Publication 11. Without appropriate precautions,
there may be potential difficulties ensuring
electromagnetic compatibility in other
environments due to conducted as well as
radiated disturbance.

This equipment is supplied as "enclosed"
equipment. It should not require additional
system enclosure when used in locations
consistent with the enclosure type ratings stated
in the Specifications section of this publication.
Subsequent sections of this publication may
contain additional information regarding specific
enclosure type ratings, beyond what this product
provides, that are required to comply with
certain product safety certifications.

NOTE: See NEMA Standards publication 250
and IEC publication 60529, as applicable, for
explanations of the degrees of protection
provided by different types of enclosure. Also,
see the appropriate sections in this publication,
as well as the Allen-Bradley publication 1770-4.1
("Industrial Automation Wiring and Grounding
Guidelines"), for additional installation
requirements pertaining to this equipment.

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4 CompactBlock Distributed I/O on Remote I/O

ATTENTION

!

Installing CompactBlock I/O

Follow these steps, to install the 1791R I/O module:

1. Set the Node Address on the Base Module.

2. Mount the Block(s).

3. Connect the Input/Output Wires to the Block.

4. Connect the RIO Cable.

5. Select termination for the module.

6. Connect power to the module.

7. Remove the terminal block.

8. Insert the terminal block.

9. Communicate with the 1791R Module.

These steps are explained in detail in the following
procedures.

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic
discharge, which can cause internal damage and
affect normal operation. Follow these guidelines
when you handle this equipment:

Publication 1791R-IN001A-EN-P - February 2002

• Touch a grounded object to discharge

potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on

component boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static-safe workstation.

• When not in use, store the equipment in

appropriate static-safe packaging.

CompactBlock Distributed I/O on Remote I/O 5

IMPORTANT

Vi

Set the Node Address on the Base Module

The node address for network connection is set using two 8-bit DIP
switches. To set the node address, lift the door containing the status
LEDs on the top left side of the module. The switches are read at
module power up only. The rack address setting and the starting

quarter setting are described below.

It is important to monitor the rack fault bit.
When installing a system for the first time, it is
possible to mistakenly put devices with duplicate
rack addresses on the same network. Blocks
with duplicate addresses may in certain instances
cause outputs to toggle on/off until the duplicate
address error is corrected.

ew when looking into module.

DIP Switch Settings

The 1791R DIP switches are described in the table below.

DIP Switch No. Description Starting Quarter

SW1

8

7

6

5

4

3

ON

2

1

1 Starting Quarter

2 Starting Quarter

8

7

6

5

4

3

ON

SW1-2 SW1-2

2

1

Module

Group

0 0 0 (1st)

0 1 2 (2nd)

1 0 4 (3rd)

1 1 6 (4th)

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6 CompactBlock Distributed I/O on Remote I/O

DIP Switch No. Description

3 Rack Address

4 Rack Address

SW1

5 Rack Address

6 Rack Address

See table below.

7 Rack Address

8 Rack Address

Rack Address (6 bit): Position in scanner data mapping.
Starting Quarter: Position in Rack Address with 1/4 rack size data.

Rack addresses are listed in the table below.

1747-SN
Rack
Number

Rack 0 Rack 1 Rack 1 Not Valid Rack 0 Rack 0 0 0 0 0 0 0

Rack 1 Rack 2 Rack 2 Rack 1 Rack 1 Rack 1 0 0 0 0 0 1

Rack 2 Rack 3 Rack 3 Rack 2 Rack 2 Rack 2 0 0 0 0 1 0

Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 3 0 0 0 0 1 1

1771-SN
Rack
Number

Rack 5 Rack 5 Rack 4 Rack 4 Rack 4 0 0 0 1 0 0

Rack 6 Rack 6 Rack 5 Rack 5 Rack 5 0 0 0 1 0 1

Rack 7 Rack 7 Rack 6 Rack 6 Rack 6 0 0 0 1 1 0

PLC-2
Rack
Number

PLC-5
Rack
Number

Rack 7 Rack 7 Rack 7 0 0 0 1 1 1

Rack 10 Rack 10 Rack 10 0 0 1 0 0 0

Rack 11 Rack 11 Rack 11 0 0 1 0 0 1

Rack 12 Rack 12 Rack 12 0 0 1 0 1 0

Rack 13 Rack 13 Rack 13 0 0 1 0 1 1

Rack 14 Rack 14 Rack 14 0 0 1 1 0 0

Rack 15 Rack 15 Rack 15 0 0 1 1 0 1

Rack 16 Rack 16 Rack 16 0 0 1 1 1 0

Rack 17 Rack 17 Rack 17 0 0 1 1 1 1

PLC5/250
Rack
Number

PLC-3
Rack
Number

SW1 Switch Position

876543

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CompactBlock Distributed I/O on Remote I/O 7

1747-SN
Rack
Number

1771-SN
Rack
Number

PLC-2
Rack
Number

PLC-5
Rack
Number

Rack 20 Rack 20 Rack 20 0 1 0 0 0 0

Rack 21 Rack 21 Rack 21 0 1 0 0 0 1

Rack 22 Rack 22 Rack 22 0 1 0 0 1 0

Rack 23 Rack 23 Rack 23 0 1 0 0 1 1

Rack 24 Rack 24 Rack 24 0 1 0 1 0 0

Rack 25 Rack 25 Rack 25 0 1 0 1 0 1

Rack 26 Rack 26 Rack 26 0 1 0 1 1 0

Rack 27 Rack 27 Rack 27 0 1 0 1 1 1

PLC5/250
Rack
Number

Rack 30 Rack 30 011000

Rack 31 Rack 31 011001

Rack 32 Rack 32 011010

Rack 33 Rack 33 011011

Rack 34 Rack 34 011100

Rack 35 Rack 35 011101

Rack 36 Rack 36 011110

Rack 37 Rack 37 011111

PLC-3
Rack
Number

Rack 40 100000

Rack 41 100001

Rack 42 100010

Rack 43 100011

Rack 44 100100

Rack 45 100101

Rack 46 100110

Rack 47 100111

Rack 50 101000

Rack 51 101001

Rack 52 101010

Rack 53 101011

Rack 54 101100

Rack 55 101101

SW1 Switch Position

876543

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8 CompactBlock Distributed I/O on Remote I/O

1747-SN
Rack
Number

Rack address 77 is an illegal configuration.

PLC-5/11 processors can scan rack 03.

1771-SN
Rack
Number

PLC-2
Rack
Number

PLC-5
Rack
Number

PLC5/250
Rack
Number

PLC5/15 and PLC-5/20 processors can scan racks 01-03.
PLC5/25 and PLC-5/30 processors can scan racks 01-07.
PLC5/40 and PLC-5/40L processors can scan racks 01-17.
PLC5/60 and PLC-5/60L processors can scan racks 01-27.
PLC5/250 processors can scan racks 00-37.

PLC-3
Rack
Number

Rack 56 101110

Rack 57 101111

Rack 60 110000

Rack 61 110001

Rack 62 110010

Rack 63 110011

Rack 64 110100

Rack 65 110101

Rack 66 110110

Rack 67 110111

Rack 70 111000

Rack 71 111001

Rack 72 111010

Rack 73 111011

Rack 74 111100

Rack 75 111101

Rack 76 111110

Not Valid111111

SW1 Switch Position

876543

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CompactBlock Distributed I/O on Remote I/O 9

WARNING

!

DIP

Switch

SW2

No. Description ON OFF

1Comm Rate

2Comm Rate

3 N/A

4 Hold Last State Hold Last State Output Reset

5 Processor

Restart/Lockout

6 Last I/O Last Rack Not Last Rack

7 Filter Speed Setting

8 Filter Speed Setting

00=57.6K 01=115.2K
10=230.4K 11=230.4K

Lockout Restart

00=2ms 10=4ms
01=8ms 11=16ms

Mount the Block(s)

The base and expansion modules mount to a panel or DIN rail which
must be grounded before installing the module(s).

Base Module Mounting

Install the CompactBlock base module on a panel or DIN rail.

When used in a Class I, Division 2, hazardous
location, this equipment must be mounted in a
suitable enclosure with proper wiring method
that complies with the governing electrical
codes.

Panel Mounting

1. Place the module against the panel where you want to mount
it.

2. Drill holes in the panel that are aligned with mounting holes
on the module.

Publication 1791R-IN001A-EN-P - February 2002