Rockwell Automation T8062 ICS Regent+Plus High Integrity Power Supply Assembly - Manual (Page 11)

I/O Power Supply Assembly (T8060,T8062)
P D - 6 0 5 0 M a r - 0 6
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Calculating the number of load units in your system helps you to determine
the number of I/O power supplies your system needs. For economic power
distribution, and to avoid overloading individual power supply units,
calculate power supply loading when configuring systems.
Regent I/O Triplicated Power Distribution
A chassis can contain two sets of triple-redundant power supplies for
Regent I/O. Each of the triple-redundant I/O power supply modules within
the I/O power supply chassis provides power for one leg of the three
redundant legs of the I/O Safetybus transceivers, and provides power to all
the I/O modules within its associated I/O chassis. Each I/O module contains
a diode OR power-sharing circuit that receives power from all three I/O
power supply modules.
Should any I/O power supply module fail, only one leg of the transceiver
modules loses power: the two remaining legs maintain proper Regent
operation. In addition, all the I/O modules continue to operate properly by
drawing their current from the two remaining power supplies within the I/O
power supply assembly.
I/O transceivers and I/O modules require power fail and reset status signals
for proper operation.