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Why is the M/S LED green ON with single flash red on my M258/LMC058?

The LED sequence means "external error detected".*
A reason can be that there is no cable connected to the ethernet port

Schneider Electric USA

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Range:
Modicon M258Modicon TM5 IP20 modular I/O systemModicon LMC058/LMC078
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Range:
Modicon M258Modicon TM5 IP20 modular I/O systemModicon LMC058/LMC078
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