Mitsubishi FX2N-10GM, Hardware / Programming Manual

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FX Series Positioning Controllers Troubleshooting 10
10-3
Remarks
• While the special relay M9127 is driven, this LED is not lit even if the battery voltage is low.
The special auxiliary relay M9143 is still actuated.
• When data registers are used for set values, the contents of the data registers could
become unstable and the set values could be changed when the battery voltage is low;
even if the EEPROM is used as the program memory. Be careful.
• The FX
2N
-10GM is a batteryless unit and incorporates EEPROM memory.
I/O indication
LED for Various I/O indication
• If an I/O indicator LED does not flash when the input switch is turned ON and OFF, check
the input wiring of the positioning unit. Especially, check if the input switch connections are
secure, if the input switch cannot be turned OFF because the input switch is in parallel with
another line, etc. If the load does not turn ON or OFF when an output indicator LED
flashes, check the output wiring.
Especially, the output transistor of the positioning unit may be damaged by a short-circuited
load or an excessive load.
Pulse output indication
• The pulse output indicator LEDs (FP and RP) usually seem to be lit dimly during normal
operation status (while pulses are output) because they are flashing at a high frequency.