11 TROUBLESHOOTING
11.2.17 Flowchart for when CONTROL BUS ERR. occurs
The following shows the flowchart to be followed when CONTROL BUS ERR. occurs at PLC
This flow chart can be confirmed only when a specific slot/base unit can be detected by the error code.
CONTROL BUS ERR. occurs.
Check the slot base unit where error occurred with the GX Developer.
Is the module of the | NO |
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applicable slot installed properly? |
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Is the extension cable of the |
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| Install the module and cable properly. |
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applicable base unit |
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installed properly? |
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| YES |
| NO | Is the "ERR." LED | YES | ||||
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| turned off? |
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Are all the extension | NO |
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cables of the base unit |
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| Install the extension cable properly. |
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connected properly? |
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| YES |
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| NO | Is the "ERR." LED | YES | |||||
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Replace the applicable module. |
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| Error detection |
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Proper operation
Replace the CPU module.
Error detection
Replace the applicable | Proper operation |
base unit. |
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Error detection
Hardware fault
Please consult your local Mitsubishi service center or representative, explaining a detailed description
| of the problem. | Completion |
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11 - 17 |
| 11 - 17 |