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MELSEC-Q
8 TROUBLESHOOTING
8.1.4 Error history monitor
With the error history monitor information, the status of the forward/reverse loop errors,
communication errors, and transient transmission errors that have occurred can be
checked. In addition, the detailed error history display and the error history can be
cleared on this screen.
(1) Error history monitor
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[Network info.]
This area displays the same information as the host information in Section 8.1.1.
1) Loop switching (SW00CE)
Displays how many times loops were switched.
<Error Cause> Station's power-ON/OFF, faulty cable, noise, etc.
<Corrective Action> See POINT on the next page.
2) Transient transmission (SW00EE)
Displays how many transient transmission errors have occurred.
<Error Cause> Power-OFF of the destination station, failure of the
destination station's CPU module, faulty cable, noise,
etc.
<Corrective Action > Check the error code of the transient transmission error
from "Error history detail..." and correct the error
referring to Section 8.3.
3) Retry (SW00C8, SW00C9)
Displays the number of retries (communication retries when a
communication error occurs.)
<Error Cause> Station's power-ON/OFF, faulty cable, noise, etc.
<Corrective Action> See POINT on the next page.
4) Line trouble (SW00CC, SW00CD)
Display how many line errors have occurred.
<Error Cause> Power-OFF of the adjacent station, faulty cable, noise,
etc.
<Corrective Action> See POINT on the next page.
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