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Fused Field Wire Conversion Module for A-B 1771-OBD to two 1756-OC8
(Cat 1492-CM1771-LD008F)
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-CM1771-LD008F, fused conversion module provides field wire signal conversion from an A-B 1771-OBD,
10 to 60Vdc, 16 point output module to two (2) 1756-OC8, 30 to 60Vdc, 8 point output modules. The conversion
module provides the mating connector to the 1771-OBD module swing-arm/terminal block with the attached field
wires. It routes those signals via its 37-pin connector and a single 1492-CONCABS1 pre-wired cable to compat-
ible terminals on the two (2) 1756-OC8 modules. To maintain the functionality of the 1771-OBD module the
conversion module provides 1 mechanical fuse; 1 for each DC+ (refer to the Wiring Diagram on page 2 for details).
NOTICE: The two 1756-OC8 modules must be located directly adjacent to each other in the 1756 chassis, due to
the orientation of the 1756 terminals on the 1492-CONCABS1 pre-wired cable.
WARNING
II. Module Installation
The 1492-CM1771-LD008F 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
Conversion Module
1492-CM1771-
LD008F
This is cable length in meters. Available lengths are limited to 005 (0.5m) and 010 (1.0m)
PN-40381
DIR 10000045377 (Version 00)
Printed in U.S.A.
Conversion Compatibility
and Product I.D. Label
37-Pin Connector for cable
1492-CONCABS1
1492-CM1771-LD008F Conversion Module
De-energize and lockout any and all power to all I/O field devices connected to the A-B 1771 I/O
chassis, and the power to the 1771 I/O chassis 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.
Compatible 1771
Output Module
1771-OBD
Cable
1492-CONCABS1
Compatible 1756
Output Module
Two
1756-OC8
Required 1492 Cable
1492-CONCABS1
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Summary of Contents for Allen-Bradley 1492-CM1771-LD008F
- Page 1 Number and in the Search box type in the catalog number of the conversion system component. I. Module Description The 1492-CM1771-LD008F, fused conversion module provides field wire signal conversion from an A-B 1771-OBD, 10 to 60Vdc, 16 point output module to two (2) 1756-OC8, 30 to 60Vdc, 8 point output modules. The conversion module provides the mating connector to the 1771-OBD module swing-arm/terminal block with the attached field wires.
- Page 2 The 1771-OBD has a single 10A, 250V rectifier fuse (1/4 x 1 1/4 inch ). The 1756-OC8 is NOT fused ,as such a 2AG fuse clip and 10A fuse is provided on the 1492-CM1771-LD008F conversion module. The 1492-CONCAB005S1 is limited to 3A per pin.
-
Page 3: Fuse Installation And Replacement
V. Fuse Installation and Replacement The 1492-CM1771-LD008F conversion module has one mechanical fuse holder with the fuse located on the circuit board inside the modules plastic case. The following explains how to replace the fuse: 1) Remove the 4 screws that hold both halves of the conversion module case together (refer to the following Figure A). - Page 4 V. 1492-CM1771-LD008F Conversion Module Specifications (Operating specifications are when installed in the Conversion System base / cover-plate assembly) Specification Value 11.81 in. (height) x 4.38 in. (depth) x 1.5 in. (width) Dimensions 300 mm. (height) x 111.25 mm (depth) x 38.1 mm (width) Approximate Shipping Weight 265.4 g (0.58 lbs) (includes carton)
-
Page 5: Appendix A - 1771 Chassis To 1756 Chassis Conversion System Selection Process
VII. Appendix A - 1771 chassis to 1756 Chassis Conversion System Selection Process 1) Determine the number of 1771 I/O modules used in the 1771 I/O Chassis to be converted to 1756. NOTE: In some cases two 1756 modules may be required for one 1771 module. Select the applicable 1492 conversion modules from the Digital and Analog Conversion Selection Table Matrix. - Page 6 PN-40381 DIR 10000045377 (Version 00) Printed in U.S.A.
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