Rockwell Automation 1790-TXXXX User Manual

Installation Instructions

Digital Expansion Terminal Block
CompactBlock LDX I/O

(Cat. Nos. 1790-T16BV0X, -T8BV8VX, -T8BV8BX, -T0B16X,

-T0V16X, -T0W8X, -T8A0X, -T0A8X)

What This Document Describes

This document describes how to install your CompactBlock
LDX I/O.

For information on: Refer to page:

Important User Information 2

Installing CompactBlock LDX I/O 5

Connecting an Expansion Block to a Base Block 8

Wiring the Expansion Blocks 10

Troubleshooting with the Indicators 13

Specifications 14

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WARNING

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WARNING

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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 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:

Publication 1790-IN005B-EN-P - April 2003

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.

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ATTENTION

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IMPORTANT

ATTENTION

!

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.

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.

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ATTENTION

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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 "open type"
equipment. It must be mounted within an
enclosure that is suitably designed for those
specific environmental conditions that will be
present and appropriately designed to prevent
personal injury resulting from accessibility to live
parts. The interior of the enclosure must be
accessible only by the use of a tool. Subsequent
sections of this publication may contain additional
information regarding specific enclosure type
ratings 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.

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WARNING

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WARNING

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Installing CompactBlock LDX I/O

Follow these steps to install the expansion block:

1. Mount the block.

2. Connect an expansion block to a base block.

3. Wire the expansion blocks.

These steps are explained in detail in the following sections.

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

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Compact

PULL

PULL

Compact

PULL

PULL

Compact

PULL

PULL

Compact

PULL

PULL

Compact

PULL

PULL

Compact

PULL

PULL

Compact

PULL

PULL

Mount the Expansion Block

Mount the expansion block and connect it to a
previously-installed CompactBlock LDX I/O base or expansion
block.

Beginning with the base block, you can mount your
CompactBlock LDX I/O blocks either horizontally or vertically:

• horizontally (left to right) - add expansion blocks in an
end-to-end configuration

• vertically (up or down) - add expansion blocks either up or
down in a back-to-back configuration. In this configuration,
you must use the optional 15cm ribbon cable
(1790-15CMCBL) and alternately position the blocks in a
right-side up, upside-down fashion.

Compact

Block LDX

Compact

Block LDX

EXPANSION UNIT

PULL

RIGHT SIDE UP

Horizontal mounting

EXPANSION UNIT

PULL

PULL

RIGHT SIDE UP

Vertical mounting

Compact

Block LDX

PULL

PULL

PULL

PULL

Compact

EXPANSION UNIT

RIGHT SIDE UP

UPSIDE DOWN

Compact

Block LDX

Compact

EXPANSION UNIT

RIGHT SIDE UP

EXPANSION UNIT

PULL

RIGHT SIDE UP

Block LDX

PULL

EXPANSION UNIT

Block LDX

PULL

Compact

Block LDX

The longer expansion cable
(1790-15CMCBL) will allow
up to 7cm of space in between
blocks.

PULL

EXPANSION UNIT

PULL

PULL

PULL

RIGHT SIDE UP

You can mount your blocks on a panel or DIN rail as
described in the following section.

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Panel Mounting

1. On the panel, position the expansion block next to your
previously-installed base block.

2. Gently pull and position the expansion covers inward.

3. Place a center punch, nail or similar device through the

mounting holes in the block (lower left and upper right
corners of the module) and make two marks on the
panel.

4. Remove the block and drill two holes in the panel to
accommodate each of the mounting screws.

5. Replace the block on the panel and place a screw

through each of the two mounting holes. Tighten the
screws until the block is firmly in place.

95 mm

3.74 in

7

41 mm

1.6 in

EXPANSION UNIT

0

CompactBlock LDX

1790-16BVOX

16 INPUTS-DCPOWER

0

7

7

Expansion
Cover

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ATTENTION

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DIN Rail Mounting

1. On the DIN rail, position the expansion block next to
your previously-installed base block.

2. Hook the top slot of the block over the DIN rail.

3. Pull down on the locking lever while pressing the block

against the rail.

f

Locking Lever

4. Push up on the locking lever when block is flush
against the rail. This secures the block to the rail.

Connect an Expansion Block to a Base Block

Expansion blocks should not be installed
when power is applied to the base.

1. Pull and position the expansion covers inward on both
the base and expansion blocks.

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