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MELSEC-Q
11 TROUBLESHOOTING
11.2.8 When the "USER" LED is turned on
If the "USER" LED turns on, follow the steps described below.
The "USER" LED turns on when an error is detected by the CHK instruction or the
annunciator (F) turns on.
If the "USER" LED is on, monitor the special relays SM62 and SM80 in the monitor
mode of GX Developer.
• When M62 has turned ON
The annunciator (F) is ON.
Using SD62 to SD79, check the error cause.
• When SM80 has turned ON
The "USER" LED was on by the execution of the CHK instruction.
Using SD80, check the error cause.
Eliminate the error cause after confirming it.
The "USER" LED can be turned off by:
• Making a reset with the RESET/L.CLR switch; or
• Executing the LEDR instruction in the sequence program.
REMARK
When the RESET/L.CLR switch is tilted to L.CLR several times for latch clear
operation, the "USER" LED flickers to indicate that the latch clear processing is
under operation.
When the RESET/L.CLR switch is further tilted to L.CLR while the "USER" LED
flickers, the "USER" LED turns off and terminates the latch clear processing.
11.2.9 When the "BAT." LED is turned on
If the "BAT." LED turns on, follow the steps described below.
The "BAT." LED turns on when a low battery capacity is detected.
If the "BAT." LED is on, monitor the special relays and special registers in the monitor
mode of GX Developer to check which of the CPU module and SRAM card batteries
was lowered in capacity. (SM51 to SM52, SD51 to SD52)
After confirmation, replace the battery with a new one, and reset the CPU module with
the RESET/L.CLR switch or run the LEDR instruction, and the "BAT. " LED will turns
off.