Mitsubishi Electronics Q25HCPU ユーザーズマニュアル

 

 

 

11 - 8                                                                                                                                                       11 - 8 

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.