8 TROUBLESHOOTING

8.2 Troubleshooting

8.2.1When the "RUN" LED is flashing or turned off

(1)When flashing

MELSEC-Q

Check item

Corrective action

Is the mode set to the offset/gain setting mode?

Reset switch 4 of the intelligent function module setting for

GX Developer to the normal mode (see Section 4.5).

 

(2) When off

Check item

Corrective action

Is the power being supplied?

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

Is the capacity of the power supply module adequate?

module and intelligent function module mounted on the base

 

unit to see if the power supply capacity is adequate.

 

Reset the PLC CPU and verify that it is lit. If the RUN LED

Has a watchdog timer error occurred?

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.

Is the module correctly mounted on the base unit?

Check the mounting condition of the module.

Is a module change enabled during an online module

Refer to Chapter 7 and take corrective action.

change?

 

8.2.2 When the "ERROR" LED is on or flashing

(1) When on

 

 

 

Check item

Corrective action

Is an error being generated?

Confirm the error code and take corrective action described

in Section 8.1.

 

(2) When flashing

Check item

Corrective action

Is intelligent function module setting switch 5 set to "other

Using GX Developer parameter setting, set intelligent

than 0"?

function module setting switch 5 to "0" (see Section 4.5).

8

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8 - 2

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Mitsubishi Electronics Q64AD, Q68ADI, Q68ADV user manual When off, When the Error LED is on or flashing When on

Q68ADV, Q68ADI, Q64AD specifications

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