Rockwell Automation 1492-CM800-LD006 Fused Field Wire Conversion Module for Modicon B820-008 to 1756-OC8 - Manual (Page 2)

(2) 10000021873 (Version 00)
IV. Conversion Module Wiring Diagram
The following diagram shows the connections from the existing B802-008 swing-arm, through the conversion module,
1492 cable and to the 1756-OA8 or 1756-OC8 output module. The diagram can be used as an aid in possible system
troubleshooting.
1756-OB8
1492-CABLE003U
Conversion Module Installation and Application Considerations

The voltage range of the B820-008 module is 10-60VDC and the 1756-OB8 is 10-30VDC. If the load source voltage is
greater than 30 VDC range, use the 1756-OC8.
 The B820-008 module output current limits versus 1756-OB8 limits are as follows:
B820-008 1756-OB8 w/ 1492-CABLE003U
a) Current/Point 2A 2A
b) Current/Group 6A - -
c) Current/Module 12A 8A
d) Surge Current/Pt 10A for 10ms 4A for 10ms
 The B820-008 has 4 groups (allowing 4 separate power supplies) and the 1756-OB8 has 2 groups. This module/cable
combination ties Groups 1 & 2 from the B820-008 to Group 0 on the 1756-OB8 and it ties Groups 3 & 4 from the B820-008
to Group 1 on the 1756-OB8. Field wiring modification must be made to accommodate this if multiple supplies were used.
If 4 supplies were used, 2 must be removed.
 The B820-008 provided a single fuse per group. The 1756-OB8 is NOT fused. The 1492-CM800-LD006 provides a
5x20mm fuse per 1756-OB8 Group. Fuse rating for this configuration is 4 Amps.

The 1492-CABLE003U current is limited to 2A per pin.
 Refer to your B820-008 and 1756-OB8 Installation Manual wiring schematics and diagrams. Ensure 1756 output
module ratings are not exceeded. [Reference Doc: 41170-755 (Version 03)]
1492-CM800-LD006
Conversion: B820-008 to 1756-OB8 with 1492-CM800-LD006
B820-008 Swing Arm
1
1 2
2 3
7 4
8 5
6
7
4
8
9
10
10
11
12
14
13
20
11
15
12 16
17 17
18 18
19
20
14
Output 1
Output 3
Output 2
Output 4
LOAD
Supply Voltage Grp 1
Output 5
Output 7
Output 6
Output 8
3 Common Grp 1
9 Common Grp 2
13 Common Grp 3
19 Common Grp 4
5 Not Used
6
15
16
Not Used
Not Used
Not Used
2
DC-0(+)
OUT-0
3
OUT-1
5
OUT-2
7
OUT-3
9
OUT-4
4
OUT-5
6
OUT-6
8
OUT-7
10
12
14
16
18
11
13
15
17
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
RTN OUT-1
19
1
RTN OUT-0
20
RTN OUT-1
DC-0(+)
DC-0(+)
DC-0(+)
RTN OUT-0
DC-1(+)
DC-1(+)
DC-1(+)
DC-1(+)
Supply Voltage Grp 2
Supply Voltage Grp 3
Supply Voltage Grp 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