11 TROUBLESHOOTING
11.2.5 Flowchart for when the "RUN" LED is turned off
The following shows the flowchart to be followed when the "RUN" LED of the CPU module turns off during PLC operation.
"RUN" LED is turned off.
Is the "POWER" LED of
the power supply module lit?
YES
Is "ERR." LED on/flickering?
NO
NO |
| Proceed to Section 11.2.4, |
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| "Flowchart for when the "POWER" |
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YES |
| Proceed to Section 11.2.7, |
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| "Flowchart for when the "ERR." LED |
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Reset the CPU module RESET/L. CLR switch.
"RUN" LED is off.
Set the CPU module's RUN/STOP switch to STOP and write END to address 0 with the GX Developer.
Set the RUN/STOP switch to RUN and enter to the monitor mode with the GX Developer to be operated.
"RUN" LED is on.
Considered to be a sequence program error.
Check the program and modify the program error location.
"RUN" LED |
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is on. |
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| (1) | PLC part/connection fault |
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| (2) | By excessive noise |
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| For the case of (1) | For the | |
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Please consult your local Mitsubishi service center or representative, explaining a detailed description of the problem.
"RUN" LED does not turn on.
Connect a surge protector circuit such as CR to the noise source.
NO | Can "RUN" LED | ||
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| be turned on? | |
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| YES |
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| Completion | |
11 - 6 | 11 - 6 |