Status indicators
RUN
LED
STOP
LED
Status
on
off
The CPU is in the RUN state.
off
on
The CPU is in the STOP state. After a stop
request by switch or PG function, the STOP
LED is continuously lit because the transition
to the STOP state was requested by the user
or, in multiprocessor operation by another
CPU, and was not caused by the CPU itself.
off
off
The CPU is in the INITIAL START or
program check state.
off
slow
flashing
The CPU is in the STOP state. The CPU has
caused a transition to the STOP state (possibly
also for the other CPUs). If you set the mode
switch to STOP, the flashing LED becomes
continuously lit.
off
rapid
flashing
The CPU is in the STOP state. An overall
reset has been requested. This request can be
initiated by the CPU itself or by operator
action.
CPU 922
System Manual
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C79000-B8576-C199-03