Rockwell Automation 1492-CM800-LD011 User Manual

Fused Field Wire Conversion Module for Modicon B838-032 to 1756-OB32

(Cat 1492-CM800-LD011)

10000021898 (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-LD011 conversion module provides field wire signal conversion from a Modicon® B838-032, 20 to
28Vdc, 32-pt output module to a ControLogix 1756-OB32, 10 to 31.2Vdc, 32-pt output module. 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 40-pin connector and a 1492-CABLEZ pre-wired cable to compatible terminals of the
1756-OB32. To maintain the functionality of the B838-032 output module the conversion module provides a mechani­cal fuse for each of the two power supplies (DC-0+ and DC-1+) on the 1756-OB32 (refer to the Wiring Diagram on
page 2).

II. Module Installation

The 1492-CM800-LD011 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).

40-Pin Connector for 1492-CABLE

Z

Mating Connector for
B800 Terminal Block

Conversion Module Compatible 800

Output Module

Compatible 1756

Output Module

Required 1492 Cable

1492-CM800-LD011 B838-032 1756-OB32 1492-CABLEZ

1492-CM800-LD011 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)

10000021898 (Version 00)

IV. Conversion Module Wiring Diagram

The following diagram shows the connections from the existing B838-032 swing-arm, through the conversion module,
1492 cable and to the 1756-OB32 output module. The diagram can be used as an aid in possible system troubleshooting.

1756-OB32

1492-CABLE003Z

1492-CM800-LD011

Conversion: B838-032 to 1756-OB32 with 1492-CM800-LD011

B838-032 Swing Arm

Conversion Module Installation and Application Considerations



The B838-032 module output current limits versus 1756-OB32 limits are as follows:

B838-032 1756-OB32 w/ 1492-CABLE003Z

a) Current/Point 0.5A 0.35A
b) Current/Group - - 4A
c) Current/Module 16A 8A
d) Surge Current/Pt 2.5A for 0.5ms 1A for 10ms



The B838-032 has 4 groups (allowing 4 separate power supplies) and the 1756-OB32 has 2 groups. This module/cable combi­nation ties Groups 1 & 2 from the B838-032 to Group 0 on the 1756-OB32 and it ties Groups 3 & 4 from the B838-032 to Group 1
on the 1756-OB32. Field wiring modification must be made to accommodate this if multiple supplies were used. If 4 supplies were
used, 2 must be removed.
 The B838-032 provided a single fuse per group. The 1756-OB32 is NOT fused. The 1492-CM800-LD011 provides a 5x20mm
fuse per 1756-OB32 Group. Fuse rating for this configuration is 4 Amps.

 The 1492-CABLE003Z current is limited to 2A per pin.
 Refer to your B838-032 and 1756-OB32 Installation Manual wiring schematics and diagrams.

Ensure 1756 output module

ratings are not exceeded.

[Reference Doc: 41170-761 (Version 03)]

1
2
3

4
1 5
21 6
2 7
22 8
3 9
23 10
4 11
24 12
7 13
27
8 15
28 16
9 17
29 18
10 19
30 20

14

11 21
31 22
12 23
32 24
13 25
33 26
14 27
34 28
17 29
37 30
18 31
38 32
19 33
39
20 35
40 36

26

37

16

38

39

40

34

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

36

5

6

18

DC-0(+)

OUT-0

1

OUT-16

19

OUT-1

2

OUT-17

20

OUT-2

3

OUT-18

21

OUT-3

4

OUT-19

22

OUT-4

5

OUT-20

23

OUT-5

6

OUT-21

24

OUT-6

7

OUT-22

25

Black

White

Red

Green

Orange

Blue

White/Black

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

OUT-7

8

DC-1(+)

36

OUT-23

26

OUT-8

9

OUT-24

27

OUT-9

10

OUT-25

28

OUT-10

11

OUT-26

29

OUT-11

12

OUT-27

30

OUT-12

13

OUT-28

31

OUT-13

14

OUT-29

32

OUT-14

15

OUT-30

33

Orange/Green

Black/White/Red

White/Black/Red

Red/Black/White

Green/Black/White

Orange/Black/White

Blue/Black/White

Black/Red/Green

White/Red/Green

Red/Black/Green

Green/Black/Orange

Orange/Black/Green

Blue/White/Orange

Black/White/Orange

White/Red/Orange

Orange/White/Blue

OUT-15

16

OUT-31

34
17

White/Red/Blue

Black/White/Green

White/Black/Green

Red/White/Green

35

RTN OUT-0
RTN OUT-1

Group 1(-)

+

-

LOAD

25
15
35

Group 3(-)
Group 2(-)
Group 4(-)

Group 1(+)
Group 3(+)
Group 2(+)
Group 4(+)





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. In addition, refer to the current draw requirements of the existing
loads for this configuration to ensure they are within the current ratings of the 1756 output module.

WARNING