22.
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TROUBLESHOOTING
22.2.6 When the "USER" LED is turned ON
The case when the "USER" LED of the CPU module is turned ON is described.
With theQnACPU, the "USER" LED comes ON when an error is detected by the CHK
instruction, or when an annunciator (F), turns ON.
When the "USER" LED is turned ON, monitor SM62 and SM80 of the special relay in the
peripheral device monitor mode.
After monitoring and removing the cause, the "USER" LED can be turned OFF by resetting
the RUN/STOP key switch or performing the LEDR instruction.
• When SM62 is ON
With the annunciator (F) ON, the "USER" LED is ON.
Check the error cause with SD62 to SD79.
• When SM80 is ON
With execution of the CHK instruction, the "USER" LED is ON.
Check the error cause with SD80.
After checking the error cause, remove the cause.
The "USER" LED can be turned OFF by either of the following operations.
• Resetting the system with the RUN/STOP key switch
• Execution of the LEDR instruction with the sequence program
REMARK
When the RUN/STOP key switch is turned to "L.CLR" several times in a latch clear
operation, the "USER" LED flashes to indicate that latch clear processing is in
progress.
(With Q3ACPU and Q4ACPU, the message "L.CLR RDY" is displayed in the LED
indicator on the front panel of the CPU module.)
When the RUN/STOP key switch is turned once more to "L.CLR" while the "USER"
LED is flashing, the "USER" LED goes OFF and latch clear processing is ended.
22.2.7 When the "BAT.ARM" LED is turned ON
The case when the "BAT.ARM" LED of the CPU module is turned ON is described.
With theQnACPU, the "BAT.ARM" LED turns ON when the voltage of the battery for a CPU
module or a memory card drops.
When the "BAT.ARM" LED turns ON, monitor the special relays (SM51 and SM52) and
special registers (SD51 and SD52) in the peripheral device monitor mode, and check if
there has been a voltage drop at either of the battery for a CPU module or a memory card.
After monitoring and replacing the battery by a new one, the "BAT.ALM" LED can be
turned OFF by resetting the RUN/STOP key switch or performing the LEDR instruction.
With the Q3ACPU and Q4ACPU, a message is displayed in the LED indicator on the front
panel of the CPU module.
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