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MELSEC-Q
8 TROUBLESHOOTING
(2) Error history detail monitoring
The cause of loop switching and history of the transient transmission error are
displayed.
4)
1)
2
)
3)
[Loop switching]
1) Station No. (SW00E0 to 00E7)
The station number which requested loop switching or loopback is displayed.
(The station is not always the adjacent one.)
2) Factor (SW00D0 to 00DF)
The factor for the loop switching or loopback is displayed.
3) Switched to (SW00D0 to 00DF)
The data link status after loop switching is displayed.
[Transient transmission errors]
4) Err. code, Error type (SW00F0 to 00FF)
The error code is displayed.
Refer to Section 8.3
(3) Clear of error history
To clear error history, check the checkbox of the clear-target error history on the
Clear of error history window. (Multiple items can be selected.)