Troubleshooting - Mitsubishi MELSEC Q Series User Manual

8

TROUBLESHOOTING

8.2 Troubleshooting
8.2.1 When the "RUN" LED is flashing or turned off
Is the mode set to the offset/gain setting mode?
Is the power being supplied?
Is the capacity of the power supply module adequate?
Has a watchdog timer error occurred?
Is the module correctly mounted on the base unit?
Is a module change enabled during an online module
change?
8.2.2 When the "ERR." LED is on or flashing
Is an error being generated?
8.2.3 When the "ALM" LED is on or flashing
Is a warning output being generated?
Is an input signal error being generated?
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(1) When flashing
Check item
(2) When off
Check item
Check item
(1) When on
Check item
(2) When flashing
Check item
Corrective action
Reset switch 4 of the intelligent function module setting for
GX Developer to the normal mode (see Section 4.5).
Corrective action
Confirm that the supply voltage for the power supply module
is within the rated range.
Calculate the current consumption of the CPU module, I/O
module and intelligent function module mounted on the base
unit to see if the power supply capacity is adequate.
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. Contact the nearest
distributor or branch office with a description of the problem.
Check the mounting condition of the module.
Refer to Chapter 7 and take corrective action.
Corrective action
Confirm the error code and take corrective action described
in Section 8.1.
Corrective action
Check the warning output flag (buffer memory address 48:
Un\G48).
Corrective action
Check the input signal error detection flag (buffer memory
address 49: Un\G49).
MELSEC-Q
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