Mitsubishi QJ71BR11 User Manual

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MELSEC-Q
8 TROUBLESHOOTING
5) UNDER (SW00B8, SW00C0)
Displays how many UNDER errors have occurred.
<Error Cause> Power-ON/OFF of the adjacent station, faulty cable,
etc.
<Corrective Action> See the following POINT.
6) CRC (SW00B9, SW00C1)
Displays how many CRC errors have occurred.
<Error Cause> Isolation of the sending station, faulty cable, hardware
failure, noise, etc.
<Corrective Action> See the following POINT.
7) OVER (SW00BA, SW00C2)
Displays how many OVER errors have occurred.
<Error Cause> Faulty cable, hardware failure, noise, etc.
<Corrective Action> See the following POINT.
8) SHORTFRAME (SW00BB, SW00C3)
Displays how many short frame errors (messages too short) have occurred.
<Error Cause> Faulty cable, hardware failure, noise, etc.
<Corrective Action> See the following POINT.
9) ABORT (SW00BC, SW00C4)
Displays how many AB and IF errors have occurred.
<Error Cause> Isolation of the sending station, faulty cable, hardware
failure, noise, etc.
<Corrective Action> See the following POINT.
10) TIMEOUT (SW00BD, SW00C5)
Displays how many timeout errors have occurred.
<Error Cause> Data link monitoring time too short, faulty cable, noise,
etc.
<Corrective Action> See the following POINT.
11) Exceeding 2 kb (SW00BE, SW00C6)
Display how many times messages exceeding 2k bytes were received.
<Error Cause> Faulty cable, hardware failure, noise, etc.
<Corrective Action> See the following POINT.
12) DPLL ERROR (SW00BF, SW00C7)
Displays how many times the DPLL errors occurred.
<Error Cause> Faulty cable, hardware failure, noise, etc.
<Corrective Action> See the following POINT.
POINT
The number of each error occurrence does not necessarily mean a problem unless
the count value rises frequently during opeatoin. If it rises frequently, observe the
following.
1) Check the power-ON/OFF status of the pertinent and other stations.
2) Check the condition of the cables and connectors. (Disconnection or
looseness of the connectors, cable breakage, cable length, etc.)
3) Perform the self-loopback test, internal self-loopback test and hardware test.
4) Peform the station-to-station test, forward/reverse loop test.
5) Referring to the user's manual (for hardware) of the network nodule, perform
the wiring again. Also, set the system again referring to the user's manual of
the CPU module.

Mitsubishi QJ71BR11 Specifications

General

Brand	Mitsubishi
Model	QJ71BR11
Category	Controller
Language	English