Applicable Systems
Modicon M221
Modicon M241
Modicon M251
Modicon M340
Modicon M580
Altivar
Symptoms
Internal communication fault detected.
Possible Causes
Internal bus communication failure between boards.
Troubleshooting Steps
Check board connections, reseat boards. Replace if needed.
How to Reset
Reseat boards and power cycle
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Source: Schneider ATV630 fault manual
Category: Electrical
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