Rockwell Automation 1791D-N4CV2X User Manual

Installation Instructions

Compact

Block

I/O Analog Combination

Input/Output Expansion Module

(Cat. No. 1791D-N4CV2X)

1791D CompactBlock™ I/O input/output expansion module is a
combination 4 channel input and 2 channel output module. This combination
module serves as an analog expansion I/O for 1791D (DeviceNet), 1791P
(PROFIBUS DP), and 1791R (RIO) CompactBlock I/O.

CompactBlock I/O modules must be installed in a secondary enclosure.

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
Rockwell Automation be responsible or liable for indirect or consequential
damage resulting from the use or application of these products.

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,
Rockwell Automation 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
Rockwell Automation office), describes some important differences between

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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.

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

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

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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.

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.

Installing CompactBlock I/O

Follow these steps to install the 1791D I/O analog expansion module:

1. Mount the module.

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2. Connect the input/output wires.

3. Remove the terminal block.

4. Insert the terminal block.

5. Communicate with the CompactBlock base 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:

• 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.

Mount the Module

The base and expansion modules mount to a panel or DIN rail, which must
be grounded before installing the module(s). For instructions on how to
mount a base module, refer to the installation instructions for the specified
module (1791D, 1791P, or 1791R).

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Base Module

141 mm

5.55 in

41 mm

1.6 in

41673

Module Mounting

You can install the CompactBlock 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.

3. Place screws through each of the 2 mounting holes and tighten the
screws until the module is firmly in place.

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Locking Lever

90358

DIN Rail Mounting

1. Hook top of slot over the DIN Rail.

2. Pull down on the locking lever while pressing the block against the

rail.

3. Push up on the locking lever to secure the block to the rail when block
is flush against the rail.

Connecting an Expansion Module to a Base Module

Expansion blocks should not be installed when power

is applied to the base.

Make sure you carefully read the section “Word/Bit

Definitions” on page

data sizes.

NOTE: 1791D-4B0 cannot be connected to expansion modules.

1. Remove the expansion covers from both the base and expansion

modules.

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11 to change produce and consume