Rockwell Automation 1492-CM800-LD012 User Manual

Field Wire Conversion Module for Modicon B838-032 Module to
Two 1756-OB16E Modules

(Cat 1492-CM800-LD012)

10000021903 (Version 00)

Printed in Germany

Local language (French, Italian, German & Spanish) versions of this document can be downloaded by going to www.ab.com.
In the left margin click on Publications Library and Literature Library. In the Search Area (right margin), Search by Catalog
Number and in the Search box type in the catalog number of the conversion system component.

I. Module Description

The 1492-CM800-LD012 conversion module provides field wire signal conversion from a Modicon® B838-032, 20 to
28Vdc, 32-pt output module to two ControLogix 1756-OB16E, 10 to 31.2Vdc, 16-pt output modules. The conversion
module provides the mating connections to the B838-032 swing-arm (terminal block) with the attached field wires. It
routes those signals, via its two 20-pin connectors and two 1492-CABLEX pre-wired cables to compatible terminals
of two 1756-OB16E modules (refer to the Wiring Diagram on page 2). NOTE: The B838-032 was mechanically fused
per group. The 1756-OB16E is electronically fused per group. Refer to the 1756-OB16E Installation Manual for addi­tional details on electronic fuse operation.

II. Module Installation

The 1492-CM800-LD012 conversion module must be installed in a 1492 conversion base-plate and cover-plate
assembly. The installation of the module into the assembly is explained in the Installation Manual that ships with the
conversion assembly. For a list of compatible assemblies refer to Appendix A.

III. Conversion Module Compatibility Matrix



This is the cable length in meters and tenths of meters (e.g. 015 = 1.5 meters). Recommended cable

length is 003 (00.3 meters).

Conversion Module Compatible 800

Output Module

Compatible 1756

Output Module

Required 1492 Cable

1492-CM800-LD0012 B838-032 Two 1756-OB16E Two 1492-CABLEX

Two 20-pin connectors (P1 and P2) for two 1492-CABLEX cables

Mating connector for
B800 Terminal Block

1492-CM800-LD012 Conversion Module

De-energize and lockout any and all power to all I/O field devices connected to the Modicon 800 I/O
housing, and the power to the 800 I/O housing itself. Ensure all power is de-energized and locked out to
any device in the control cabinet where the conversion is to be performed. Ensure work is performed by
qualified personnel.

WARNING

(2)

10000021903 (Version 00)

IV. Conversion Module Wiring Diagram

The following diagram shows the connections from the existing B838-032 swing-arm, through the conversion module, two 1492
cables and to the two 1756-OB16E output modules. The diagram can be used as an aid in possible system troubleshooting.

1756-OB16E

1756-OB16E

1492-CABLE003X

1492-CABLE003X

1492-CM800-LD012

Conversion: B838-032 to 1756-OB16E Qty 2 with 1492-CM800-LD012

B838-032 Swing Arm

Conversion Module Installation and Application Considerations


This configuration uses two (2) 1756-OB16E output modules to replace a single B838-032 output module. This may require

the use of a larger 1756 I/O Chassis. Ensure there is sufficient panel space to allow for this possibility.



The B838-032 module output current limits versus 1756-OB16E limits are as follows:

B838-032 1756-OB16E w/ 1492-CABLE003X

a) Current/Point 0.5A 1A
b) Current/Group ---- 2A
c) Current/Module 16A (32 pts) 4A (16 pts)
d) Surge Current/Pt 2.5A for 0.5ms 2A for 10ms



The B838-032 module provided a single mechanical fuse per group. The 1756-OB16E is electronically fused per group.

Refer to the 1756-OB16E Installation Manual for electronic fusing details.



The 1492-CABLE003X current is limited to 2A per pin.

 Refer to your B838-032 and 1756-OB16E Installation Manual wiring schematics and diagrams for more details. Ensure
1756 output module ratings are not exceeded.

[Reference Doc: 41170-762 (Version 03)]

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Output 1

Output 17

Output 2

Output 18

Output 3

Output 19

Output 4

Output 20

Output 5

Output 21

Output 6

Output 22

Output 7

Output 23

Output 8

Output 24

Output 9

Output 25

Output 10

Output 26

Output 11

Output 27

Output 12

Output 28

Output 13

Output 29

Output 14

Output 30

Output 15

Output 31

Output 16

Output 32

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6Group 1(-)

+

-

LOAD

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15

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Group 3(-)

Group 2(-)

Group 4(-)

Group 1(+)

Group 3(+)

Group 2(+)

Group 4(+)

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DC-0+

OUT-0

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OUT-1

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OUT-2

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OUT-3

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OUT-4

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OUT-5

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OUT-6

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OUT-7

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OUT-8

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OUT-9

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OUT-10

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OUT-11

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OUT-12

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OUT-13

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OUT-14

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OUT-15

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Orange/Red

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DC-1+

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9

RTN OUT-0

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RTN OUT-1

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OUT-7

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OUT-8

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OUT-9

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OUT-10

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OUT-11

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OUT-12

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OUT-13

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OUT-14

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OUT-15

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Black

White

Red

Green

Orange

Blue

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Red/Black

Green/Black

Orange/Black

Blue/Black

Black/White

Red/White

Green/White

Blue/White

Black/Red

White/Red

Orange/Red

Blue/Red

Red/Green

DC-1+

20

9

RTN OUT-0

19

RTN OUT-1

MODULE A

MODULE B

P1

P2

There are several key application considerations and system specifications (bottom of drawing) when
using these components (conversion module, cable and output module). Read and understand these
considerations before installation.

WARNING