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MELSEC-Q
8 TROUBLESHOOTING
8.2 Troubleshooting
8.2.1 RUN LED is extinguished
Check Item
Remedy
Check that power is supplied.
Confirm that the supply voltage of the power supply module is within
the rated range.
Check that the capacity of the power supply module is sufficient.
Calculate the current consumption of the CPU, I/O, intelligent
function and other modules loaded on the base unit, and make sure
that the power supply capacity is enough.
Check for a watchdog timer error.
Reset the programmable controller CPU and verify that it is lit. If the
RUN LED does not light even after doing this, the module may be
malfunctioning.
Consult your local Mitsubishi service center or representative.
Check whether the modules are loaded normally on the base unit.
Check the module loading status.
Is a module change enabled during an online module change?
Refer to Chapter 7 and take corrective action.
8.2.2 RUN LED flickers
Check Item
Remedy
Check whether the module is in the offset/gain setting mode or not. After making offset/gain setting, return to the normal mode.
8.2.3 ERROR/ERR. LED flickers
Check Item
Remedy
Check whether the switch 5 of the intelligent function module
switches is "other than 0".
Set the switch 5 of the intelligent function module switches for 0.
(Refer to Section 4.5)
8.2.4 ERROR/ERR. LED is lit
Check Item
Remedy
Check for an error.
Check the error code and take the action given in Section 8.1.
8.2.5 ALM LED flickers
Check Item
Remedy
Check for an input signal fault.
Check the Disconnection detection flag (buffer memory address 49,
Un\G49) and take the action given in Section 8.2.7.
8.2.6 ALM LED is lit
Check Item
Remedy
Check for a warning output.
Check the Warning output flag (buffer memory address 48, Un\G48).
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