Troubleshooting - Mitsubishi Electric MELSEC Q Series Reference Manual

8

TROUBLESHOOTING

8 - 13
5) UNDER (SW00B8, SW00C0)
The number of UNDER errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
6) CRC (SW00B9, SW00C1)
The number of CRC errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
7) OVER (SW00BA, SW00C2)
The number of OVER errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
8) SHORTFRAME (SW00BB, SW00C3)
The number of short frame errors (the message is too short) is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
9) ABORT (SW00BC, SW00C4)
The number of AB.IF errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
10) TIMEOUT (SW00BD, SW00C5)
The number of timeout errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
11) Exceeding 2Kb (SW00BE, SW00C6)
The number of receive errors (the data received is more than 2000 bytes) is
displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
12) DPLL ERROR (SW00BF, SW00C7)
The number of DPLL errors is displayed.
<Error Cause>
<Corrective Action> Refer to the following POINT.
POINT
The number of errors is not actually a problem as long as the number does not
increase frequently during the operation. If the number of errors, however,
increases frequently, take the following corrective action.
1) Check the power-ON/OFF status of the host station and other stations.
2) Check the connector for disconnection and looseness; and the cable for
disconnection and length, referring to the following.
Reference manual for the network module used
User's manual for the CPU module used
3) Perform the self-loopback test, internal self-loopback test and hardware test.
4) Peform the station-to-station test, forward/reverse loop test.
Such as power-ON/OFF of the adjacent station and a
cable error
Such as disconnection of the station which sends data
to the corresponding station, a cable error, hardware
failure, and noise
Such as an cable error, hardware failure, and noise
Such as an cable error, hardware failure, and noise
Such as disconnection of the station which sends data
to the corresponding station, a cable error, hardware
failure, and noise
Such as monitoring time shortage, a cable error, and
noise
Such as an cable error, hardware failure, and noise
Such as an cable error, hardware failure, and noise
MELSEC-Q
8 - 13