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MELSEC-Q
11 TROUBLESHOOTING
11.3.23 The "ERR" LED is lit.
Symptom Cause Corrective action MC
Non
procedure
protocol
Bidirectional
protocol
Pre-
defined
• A communication error has occurred. • Check the error and remove the cause
according to Section 11.1.1.
• Switch settings of the Q series C24 are
incorrect.
• Review the switch settings of the Q
series C24.
• The communication protocol mode is set
to "Pre-defined protocol mode", and
linked operation is set for two interfaces.
• For communication in the pre-defined
protocol mode, change the setting to
separate operations.
• "ERR" LED is lit
• The Q series C24 is powered off while
data are written to the flash ROM.
• Write the data to the flash ROM again.
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