Rockwell Automation 1492-CM800-LA003 User Manual
Field Wire Conversion Module for Modicon B872-100 Analog Current Output
to 1756-OF6CI Analog Current Output
(Cat 1492-CM800-LA003)
10000021838 (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-LA003 conversion module provides field wire signal conversion from a Modicon® B872-100,
analog, 4-channel, individually isolated current output module to a ControLogix 1756-OF6CI, analog, 6-channel,
individually isolated current output module. The conversion module provides the mating connections to the B872-100
swing-arm (terminal block) with the attached field wires. It routes those signals, via its 25-pin, D-shell connector and
a 1492-ACABLEY pre-wired cable to the compatible terminals of the 1756-OF6CI (refer to the Wiring Diagram on
page 2).
II. Module Installation
The 1492-CM800-LA003 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-LA003 B872-100 current output 1756-OF6CI current output 1492-ACABLEY
25pin D-shell connector for 1492-ACABLEY
Mating connector for
B800 Terminal Block
1492-CM800-LA003 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)
10000021838 (Version 00)
IV. Conversion Module Wiring Diagram
The following diagram shows the connections from the existing B872-100 swing-arm, through the conversion module, 1492 cable
and to the 1756-OF6CI analog output module. The diagram can be used as an aid in possible system troubleshooting.
1756-OF6CI
1492-ACABLE003Y
1492-CM800-LA003
Conversion: B872-100 to 1756-OF6CI with 1492-CM800-LA003
B872-100 Swing Arm
Conversion Module Installation and Application Considerations
IMPORTANT: The B872-100 analog output module required the use of an external power supply to drive the analog device. The 1756-OF6CI analog output
provides the drive power to the analog
device. ENSURE the external power supply is REMOVED from the current loop before applying power to the 1756-OF6CI module or the analog output module will
be damaged.
The 1756-OF6CI module can drive a load up to 550 ohms with the standard pre-configured cable [1492-ACABLE003Y]. If greater than 550 ohm drive current is
required, the pre-wired cable can be modified at the 1756-OF6CI terminal block to drive up to 1000 ohms. Refer to the 1756-OF6CI module Installation Manual for
modification details.
SHIELD GROUNDING: The B872-100 analog output module allowed shield grounding at the field device or to the B872-100 “Frame Ground” terminal. The
pre-wired cable used between the 1492-CM800-LA003 and the 1756-OF6CI [1492-ACABLE003Y] provides a shield ground lug to ground the shield at the 1756
ControlLogix chassis, this must be connected.
IMPORTANT: The B872-100 analog output module allowed Sinking or Sourcing field wired devices. The 1756-OF6CI analog output provides a Sourcing output
which requires a sinking field device. Please ENSURE the field device is compatible and wired in this fashion before applying power.
The B872-100 analog output module had monitoring terminals to allow for calibration or field monitoring. The 1756-OF6CI does not have such a feature.
Refer to your B872-100 and 1756-OF6CI Installation and User Manuals for additional information concerning comparisons of module wiring, features, and module
configuration details. [Reference Doc: 41170-780 (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
4
12
11
24
23
31
19
20
21
22
27
28
+
-
3
5
14
7
8
10
15
17
18
26
6
34
9
16
29
30
35
36
37
38
1
2
39
Not Used
Frame Ground
Frame Ground
Current Source 1
13
25
24
23
22
21
19
18
17
16
15
14
SH
12
11
9
6
4
2
20
40
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Monitor 2
Frame Ground
Frame Ground
1
OUT-0
RTN-0
5
OUT-1
2
RTN-1
6
OUT-2
7
RTN-2
11
OUT-3
8
RTN-3
12
RTN-4
19
OUT-4
15
Not Used
14
ALT-3
10
Red
Black
White
Black
Green
Black
Blue
Black
RTN-5
20
OUT-5
16
Yellow
Black
Brown
Black
Orange
Black
Current Source 1
Current Sink 1
13
Current Source 2
Current Source 2
Current Sink 2
25
Current Source 3
Current Source 3
Current Sink 3
33
Current Source 4
Current Source 4
Current Sink 4
32
Monitor 1
Monitor 3
Monitor 4
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