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22. TROUBLESHOOTING
22.2.4 When the "RUN" LED is flashing
Flashing of the "RUN" LED of a CPU module is described below.
With the QnACPU, when the RUN/STOP key switch is turned from STOP to RUN after
writing a program in the STOP state, the "RUN" LED flashes. Then, no CPU module error
occurs, but the operation stops.
To set the CPU module to RUN, either turn the RUN/STOP key switch to STOP then RUN
again, or reset the CPU module using the key switch. The "RUN" LED turns ON.
With the Q3ACPU and Q4ACPU, the message "PRG.CHECK!!" is displayed on the LED
indicator on the front panel of the CPU module.
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