Allen-Bradley 1771-A1B

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. This equipment is supplied as open type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present, and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool.

Your I/O chassis can receive power through:
processors with integral power supplies that provide 2-4A
power-supply modules that provide 3-8A
external power supplies that provide 6.5-16A
(external power supplies are not designed for parallel operation)
Power-supply modules are designed for parallel operation using 1771 CT cables. See your power supply installation documentation (1771 I/O Chassis and Power Supplies product data, publication
1771) for possible configurations.


Each enclosure must contain a central ground bus. The ground bus is the common connection for each chassis within the enclosure and the enclosure itself. Use either bolts or welded studs to mount the I/O chassis and central ground bus. If you are mounting a chassis to the back panel of an enclosure, use 1/4-20 (M6 x 10) mounting bolts.