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MELSEC-Q
10 TROUBLESHOOTING
10.3.20 Troubleshooting when the "ERR" LED is lit
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• A communication error has occurred. • Check the error and remove the cause
according to Section 10.1.1.
• "ERR" LED is lit
• Switch settings of the Q series C24 are
incorrect.
• Review the switch settings of the Q series
C24.