Rockwell Automation 1492-CM800-LA001 User Manual
Field Wire Conversion Module for Modicon B875-111 to 1756-IF16
in Differential Current of Differential Voltage Mode
(Cat 1492-CM800-LA001)
10000021823 (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-LA001 conversion module provides field wire signal conversion from a Modicon® B875-111,
analog, 8-channel, differential current or voltage input module to a ControLogix 1756-IF16, analog, 8-channel, differential current or voltage input module. The conversion module provides the mating connections to the B875-111
swing-arm (terminal block) with the attached field wires. It routes those signals, via its 25-pin, D-shell connector and
a 1492-ACABLEUC or 1492-ACABLEUD pre-wired cable to the compatible terminals of the 1756-IF16 (refer to
the Wiring Diagrams on pages 2 and 3).
II. Module Installation
The 1492-CM800-LA001 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).
25-Pin D-Shell Connector for 1492-ACABLE
UC or ACABLEUD
Mating Connector for
B800 Terminal Block
Conversion Module Compatible 800
Input Module
Compatible 1756
Input Module
Required 1492 Cable
1492-CM800-LA001 B875-111 (Diff-V) 1756-IF16 (Diff-V) 1492-ACABLEUC
1492-CM800-LA001 B875-111 (Diff-C) 1756-IF16 (Diff-C) 1492-ACABLEUD
1492-CM800-LA001 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)
10000021823 (Version 00)
IV. Conversion Module Wiring Diagram
The following diagrams show the connections from the existing B875-111 swing-arm, through the conversion module,
1492 cable and to the 1756-IF16 analog input module. The diagrams can be used as an aid in possible system trouble-
1756-IF16
1492-ACABLE003UD
1492-CM800-LA001
Conversion: B875-111 to 1756-IF16 (Differential Current) with 1492-CM800-LA001
B875-111 Swing Arm
3
7
8
11
12
15
16
5
9
13
17
25
29
Input 4+
Input 4-
Input 2+
Input 3+
Input 2-
Input 3-
3
2
1
14
15
16
17
18
4
6
8
10
19
12
13
25
24
23
22
20
21
+
-
4
Input 1+
Input 1-
2
Current Input 1
6
Current Input 2
10
Current Input 3
14
Current Input 4
23
27
28
31
32
35
36
Input 8+
Input 8-
Input 6+
Input 7+
Input 6-
Input 7-
24
Input 5+
Input 5-
22
Current Input 5
26
Current Input 6
30
Current Input 7
34
Current Input 8
SH
33
37
Shield 8
Shield 7
Shield 6
Shield 5
Shield 4
Shield 3
Shield 2
Shield 1
1
40
18
19
20
21
38
39
Voltage Reference -
Voltage Reference +
Not Used
Not Used
Not Used
Not Used
Case Ground
Case Ground
2
IN-0
IN-1
4
IN-2
6
IN-3
8
IN-4
12
IN-5
14
IN-6
16
IN-7
18
RTN
10
IN-9
22
IN-8
20
IN-11
26
IN-10
24
IN-15
36
IN-14
34
Red
Black
White
Black
Green
Black
Blue
Black
Red
Green
IN-13
32
IN-12
30
Yellow
Black
Brown
Black
Orange
Black
Red
White
iRTN-2
5
iRTN-0
1
iRTN-6
15
iRTN-4
11
iRTN-10
23
iRTN-8
19
iRTN-14
33
iRTN-12
29
Conversion Module Installation and Application Considerations
The B875-111 indicated differential inputs. When it was configured for single ended inputs, it was referred to as a B877-111.
SHIELD GROUNDING: For differential current analog inputs the B875-111 recommended grounding the field wiring shield at the B875-111 module. The
1492 conversion module accounts for this shield ground connection. The pre-wired cable used between the 1492-CM800-LA001 and the 1756-IF16 [1492ACABLE003UD] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected.
The B875-111 recommended placing jumpers from UNUSED to USED analog input channels. These jumpers MUST be removed or they will result in
improper operation.
The B75-111 analog input ranges were configured by DIP switches on the module. The appropriate range for the 1756-IF16 is configured by software.
This design assumes that all inputs on the B875-111 were connected to current transmitters. If there was a mix of current and voltage transmitters,
then modification of the pre-wired cable [1492-ACABLE003UD] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation
Manual for modification details.
CASE GROUND: If connected, remove this wire from the B875-111 terminal block, as it serves no purpose for the 1756-IF16.
Refer to your B875-111 and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features, and
configuration details.
[Reference Doc: 41170-763 (Version 03)]
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
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