11 TROUBLESHOOTING
11.2.10 Flowchart for when the "BOOT" LED is flickering
The following shows the flowchart to be followed when the "BOOT" LED of the CPU module flickers at PLC
"BOOT" LED flickering
Power off the PLC.
Remove the memory card.
Move the DIP switches SW2 and
SW3 of the CPU module to ON.
Power on the PLC.
| Is the "BOOT" LED turned on? | YES |
| Completion of automatic write from |
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| memory card to standard ROM |
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| NO |
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| Perform boot operation from |
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| CPU module hardware fault. |
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| standard ROM. |
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| Please consult your local Mitsubishi |
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| service center or representative, |
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| explaining a detailed description |
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| of the problem. |
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11 - 9 | 11 - 9 |