Rockwell Automation 1771-P4S_P6S_P4S1_P6S1 Power Supply Modules Installation Instructions - Manual (Page 6)

Publication 1771-IN079A-EN-P - June 2002
6 Allen-Bradley Power Supply Modules
Connect a Paralleling Cable
You can use two power supplies in the same I/O chassis to provide more
current by connecting them with a power-supply paralleling cable (cat. no.
1771-CT). This connection is for communcation between the two supplies.
If one supply has to shut down, it tells the second supply to turn off its
indicator. Although the adapter or in-chassis processor is disabled, the
second supply will continue trying to operate until its dc output limits are
exceeded. Because the adapter or in-chassis processor is disabled,
paralleling two supplies does not provide redundancy.
To connect the cable:
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Figure 1 - Power Connections and Paralleling Cable Connections