10 CPU Unit Functions
10-26
CJ2 CPU Unit Software User’s Manual
The CJ1W-PA205R Power Supply Unit is equipped with a RUN output. This output point is ON (closed)
when the CPU Unit is operating in RUN or MONITOR mode.
This RUN output can be used to create an external safety circuits, such as an emergency stop circuit
that prevents an Output Unit's external power supply from providing power unless the PLC is ON.
Note When a Power Supply Unit without a RUN output is used, an equivalent output can be created by program-
ming the Always ON Flag (A1) as the execution condition for an output point from an Output Unit.
Precautions for Safe Use
If Output Unit's external power supply goes ON before the PLC's power supply, the Output Unit
may malfunction momentarily when the PLC first goes ON. To prevent any malfunction, add an
external circuit that prevents the Output Unit's external power supply from going ON before the
power supply to the PLC itself. Create a fail-safe circuit like the one described above to ensure
that power is supplied by an external power supply only when the PLC is operating in RUN or
MONITOR mode.
10-3-4 RUN Output
RUN Output
Name Operation
RUN output MONITOR or RUN mode: ON (closed)
PROGRAM mode: OFF (open)
Power Supply Unit
RUN output
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