Rockwell Automation 1492-CM800-LD011 Field Wire Conv. Module for Modicon B838-032 to 1756-OB32 - Manual (Page 2)

(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 combi-
nation 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