11 TROUBLESHOOTING
11.2.2 Flowchart for when the "MODE" LED is not turned on
The following shows the flowchart to be followed when the "MODE" LED of the CPU module does not turn on at PLC
"MODE" LED is not turned on.
Is the power |
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supply for all the power | NO |
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| Check the wire and turn on the |
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supply modules turned on? |
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Is the wiring of the power supply |
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| power supply. |
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module correct? |
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| NO |
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| YES | Can "MODE" LED | YES | ||||||
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| be turned on? |
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Is the "POWER" | NO |
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| Exchange the power supply module, | ||||
LED for the power supply module |
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| and confirm if "POWER" LED is | |||||
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turned on? |
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| turned on. | |||||
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| YES |
| NO |
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| Can "MODE" LED | ||||||
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| be turned on? | ||
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Is the |
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extension cable | NO |
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connected properly?(Isn't IN |
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connected to IN or OUT |
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connected to |
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OUT?) |
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| YES |
| NO |
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| Can "MODE" LED | ||||||
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| be turned on? | ||
YES
YES
| Is the CPU module | "RESET" position |
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| RESET/L. CLR switch in |
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| Set the RESET/L. CLR switch in the |
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| the neutral position? |
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| neutral position. |
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| Neutral position |
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| NO |
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| YES | ||||||
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| be turned on? |
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| Hardware fault |
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| Check operations in the order |
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| starting from the minimum system. |
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| Completion | |||
| If the module will not work, |
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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 - 3 | 11 - 3 |