Power Supply
Considerations
The OC950 +5 Vdc user power supply can source up to 200 ma.
This can be used to power up to 16 I/O modules,
1
providing this
supply is not used for other purposes (encoder or user’s terminal).
If the supply is used for other purposes or if more than 16 I/O
modules are required, then the I/O mounting rack must be
powered using a separate power supply. An isolated +5 Vdc
power supply can be connected to the +5V and GND terminals on
the Opto22 I/O Mounting Rack or the Rack can be powered using
the Opto 22 PBSA power supply which operates from either 115
or 220 Vac. The PBSA supply fits underneath the CA950-IO
board.
Important
If an external supply or the PBSA is used to power the I/O
Mounting Rack, remove the plug-on jumper (E1) from the
CA950-IO PC Board. Leave this jumper installed only if the
I/O Mounting Rack is to be powered using the OC950’s 5 Vdc
supply.
3-22 MA950
1 Each I/O Module draws up to 12 mA @ 5Vdc. Therefore, the current available for other
uses (encoder or user terminal) =200 ma - NumberOfModulesPowered * 12 mA.
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