Owner's manual

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Appendix A
1771-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, Appendix B and C.
2) Review the Max Slots for I/O and chassis width data from the below table, and select a 1756 I/O Chassis which meets your conversion
needs from step 1.
3) Once the 1756 Chassis is selected, select the Conversion Assembly. The Conversion Assembly has the same dimensional foot-print as
the 1771 chassis (without an external power supply) and can use the same mounting hardware. The assembly consists of a base-plate
to hold the conversion modules and a cover-plate to protect the modules and to mount the selected 1756 chassis. The combined depth
of the conversion assembly with the 1756 chassis mounted is 10.25 inches (Controller w/key) to 10.0 inches (Controller w/o Key).
Footnotes:
 1771-A3B is not listed as it is used for 19 inch wide instrumentation panels
 Two 1771 width dimensions are provided as some PLC-5 processors have integrated power supplies. Dimension w/PS includes -P1,
-P2, etc. Notice that the width dimension of some 1756 chassis exceed the width of the 1771 chassis with or without the power supply.
Cover-plate chassis mounting design allows the excess 1756 chassis width to be evenly distributed to both sides, or excess to right or
left. Carefully consider this in the conversion
 1756-A4 may work in a 1771-A1B application if 4 or less I/O slots were used. Conversion cover-plate is capable to mount -A4 or -A7
 1756-A7 may work in a 1771-A2B application if 6 or less I/O slots were used. Conversion cover-plate is capable to mount -A7 or -A10
 1756-A10 may work in a 1771-A3B1 application if 10 or less I/O slots were used. Conversion cover-plate is capable to mount -A10 or
-A13
 1756-A13 may work in a 1771-A4B application if 13 or less I/O slots were used. Conversion cover-plate is capable to mount
-A13 or -A17
10000060110 (Version 00)
Max Slots for I/O
4
-A1B w/o
PS
4
-A1B
w/PS
3 6 8 8
6
9 12
-A13 (5)
12
-A3B1-A10-A7 (4)
-A2B
w/PS
-A2B w/o
PS
-A7-A4 (3)
16
-A17 (6)
16
-A4B
Chassis Width (2)
Conversion Assembly
Chassis Parameter(1)
1756 Equivalent
Chassis
1756 Equivalent
Chassis
24.01 29.0623.1519.0119.029.01 12.61 10.35 14.49 14.4914.01 17.61
1771 Chassis
1771 Chassis
1771 Chassis
1492-MUA1B-A4-A7 1492-MUA2B-A7-A10 1492-MUA3-A10-A13 1492-MUA4-A13-A17
1771 Chassis
1756 Equivalent
Chassis
1756 Equivalent
Chassis