Continuum Power Supply Reference
15
PS 120/240 AC 50(U), AC 85(U) Auxiliary Power
Connection
In situations where a large number of I/O modules are used, the power available from
one supply module may not be sufficient. In these scenarios an auxiliary power
supply can be connected to supply necessary power to the extended I/O group.
All Continuum power supply models can be used as auxiliary power supplies.
However, the UPS versions must be modified slightly before it is used.
Generally the auxiliary power supply is added to a remotely located group of I/O
modules. The I/O modules that are to be powered by the auxiliary supply still connect
to the other modules so that data may flow between the functional blocks of the
system, however, these I/O modules must receive power from only the auxiliary
supply. A 2-conductor shielded cable eliminating the 24 VDC signals (pins 4 & 5) is
connected between the last I/O module powered by the main power supply and the
remotely located I/O modules powered by the auxiliary supply:
Specific information regarding cable preparation and overall system layout may be
found in the Continuum I/O System Reference #30-3001-499.
Main
Power Supply
Aux.
Power Supply
4-Conductor
Shielded Cable
2-Conductor
Shielded Cable
5
4
3
2
1
5
4
3
2
1
From I/O
Modules
powered by
Main power
supply
I/O Modules
powered by
Aux. power
supply
CPU
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