Rockwell Automation 1790-XXXX User Manual

Installation Instructions

DeviceNet Base RTD and Thermocouple
CompactBlock LDX I/O

(Cat. Nos. 1790D-4R0, -4T0, -T4R0, -T4T0)

What This Document Describes

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

For information on: Refer to page:

EDS File Requirements below
Important User Information 2
Installing CompactBlock I/O 5
Wiring the Terminal Blocks 8
Connecting the Field Wiring 9
Connecting the DeviceNet Cable 14
I/O Memory Mapping 15
Troubleshooting with the Indicators 17
Module Specifications 18

EDS File Requirements

Current functionality of CompactBlock LDX I/O blocks requires

current modular EDS file for RSNetWorx for DeviceNet™ version

3.0 or later software.

These files are easy to install and are available online at:
www.ab.com/networks/eds/

EDS files for blocks with matching catalog numbers (for both
D-Shell and terminal block versions) are the same. Thus, on the
website and in RSNetWorx for DeviceNet, there is only one EDS
file for both versions of the blocks. For example, if you want the
EDS file for 1790D-T8BV8B, use the EDS file labled
1790D-8BV8B.

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WARNING

!

WARNING

!

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-IN011B-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.

3

ATTENTION

!

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

!

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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5

Installing CompactBlock LDX I/O

Follow these steps to install the block:

1. Set the node address on the base block.

2. Mount the base block.

3. Wire the terminal blocks.

4. Connect field wiring.

5. Connect the DeviceNet cable.

These steps are explained in detail in the following
procedures.

Set the Node Address on the Base Block

Each base block comes with its internal program set for node
address 63. To reset the node address, adjust the switches on
the front of the block. The two switches are most significant
digit (MSD) and least significant digit (LSD). The switches can
be set between 00 and 63.

The base block reads the rotary switches at power up only.
Switch settings between 64 and 99 cause the block to use the
last valid node address stored internally

.

Example: Node
Address is set at 11

The node address may also be set through RSNetWorx for
DeviceNet or a similar configuration tool. When software
configuration is used for the node address, the switches must
be set between 64 and 99.

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WARNING

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WARNING

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Mount the Base Block

You can mount the base block to a panel or DIN rail. We
recommend that you ground the panel or DIN rail before

mounting the block.

IMPORTANT

Panel Mounting

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

2. Gently pull and position the expansion cover to the left.

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

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

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

The RTD and thermocouple base blocks do not
support any expansion blocks.

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.

Publication 1790-IN011B-EN-P - April 2003

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

CompactBlock LDX

1790-16BVOX

41 mm

1.6 in

EXPANSION UNIT

0

0

7

16 INPUTS-DCPOWER

7

Expansion
Cover

DIN Rail Mounting

1. Hook the top slot of the block over the DIN Rail.

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

against the rail.

7

f

Locking Lever

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

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8

Wire the Terminal Blocks

The following figures show how to wire the terminal blocks.

1790D-4R0 RTD Input Module D-Shell Wiring

CH1_B

10

29

COM

CH1_B

10

29

NC

NC

11

CH3_B

CH3_A

11

10

CH3_B

NC

28

NC

28

COM

12

9

COM

9

13

12

NC

8

27

NC

8

27

NC

14

COM

NC

13

CH2_B

CH2_A

CH3_A

7

6

26

24

25

COM

COM COM COM

COM

CH2_B

CH2_A

CH3_A

7

6

26

24

25

NC

NC NC NC

NC

NC

NC

17

15

18

16

NC

NC

NC

NC

17

15

16

14

NC

NC

NC

5

5

NC

19

18

CH3_B

23

COM

CH3_B

23

NC

20

NC

NC

19

4

4

20

NC

NC

NC

NC

3

1

2

22

20

21

COM

NC

NC

NC

3

1

2

22

20

21

NC

+24V

NC

NC

CH0_B

+24V

19

37

GND

18

36

GND

+24V

17

35

GND

NC

16

15

34

33

NC

NC

CH0_A

14

32

NC

13

COM

CH1_A

11

12

30

31

COM

COM

• Wire pins 17, 18, 19 to Field Power (+) 24Vdc
Wire pins 35, 36, 37 to Field Power (-) GND

1790D-4T0 Thermocouple Module D-Shell Wiring

+24V

NC

NC

CH0_B

+24V

19

37

GND

18

36

GND

+24V

17

35

GND

NC

16

15

34

33

NC

NC

CH0_A

14

32

NC

CH1_A

11

13

12

30

31

NC

NC

• Wire pins 17, 18, 19 to Field Power (+) 24Vdc
Wire pins 35, 36, 37 to Field Power (-) GND

1790D-T4RO RTD Input Module Terminal Block Wiring

+24V

CH0_A

1

2

GND

CH1_A

3

CH0_B

5

4

CH1_B

COM

6

CH2_A

7

8

COM

CH3_A

9

10

CH2_B

• Wire pin 1 to Field Power (+) 24Vdc
Wire pin 2 to Field Power (-) GND

1790D-T4T0 Thermocouple Input Module Terminal Block Wiring

+24V

CH1_A

5

4

CH1_B

6

NC

7

CH2_A

9

8

CH2_B

NC

CH0_A

1

2

GND

3

CH0_B

• Wire pin 1 to Field Power (+) 24Vdc
Wire pin 2 to Field Power (-) GND

Publication 1790-IN011B-EN-P - April 2003