Mitsubishi MELSEC Q Series User Manual

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9.4 MELSECNET/H Utility
9.4.3 Operating Error history monitor screen
9
UTILITY OPERATION
(3) Error factors and corrective actions
The following indicates factors and corrective actions for each error.
They can also be confirmed from the following link special registers (SW), as well as
on the Error history monitor screen.
Refer to the following manual for details of the link special registers (SW).
Q Corresponding MELSECNET/H Network System Reference Manual (PLC to
PLC network)
* 1 Unless the error count value increases frequently during operation, no specific problem will arise.
Perform the following if the count value increases frequently.
1) Check whether the self and other station power supplies are ON or OFF.
2) Check the cables and connectors (for disconnected and loose connectors, broken cables, and
improper cable lengths).
3) Perform the self loopback test, internal self loopback test, and/or hardware test.
4) Perform the station-to-station test, and/or forward/reverse loop test.
5) Connect cables again, referring to the manuals of the network module and/or MELSECNET/H
board used.
Also, reinstall the system, referring to the user's manual of the CPU module used.
Table9.64 Error factors and corrective actions
Item Link special register Factor Corrective action
Loop switching SW00CE
Station's power ON/OFF,
cable fault, noise, etc.
*1
Transient transmission
errors
SW00EE
Target station's power OFF,
target station's CPU failure,
cable fault, noise, etc.
Check the error code of the transient
transmission error, and take
corrective actions.
Retry SW00C8, SW00C9
Station's power ON/OFF,
cable fault, noise, etc.
*1
Line trouble SW00CC, SW00CD
Adjacent station's power OFF,
cable fault, noise, etc.
*1
UNDER SW00B8, SW00C0
Adjacent station's power ON/
OFF, cable fault, etc.
*1
CRC SW00B9, SW00C1
Source station of data
transmission was
disconnected, cable fault,
hardware fault, noise, etc.
*1
OVER SW00BA, SW00C2 Cable fault, hardware fault,
noise, etc.
*1
SHORT FRAME SW00BB, SW00C3
ABORT SW00BC, SW00C4
Source station of data
transmission was
disconnected, cable fault,
hardware fault, noise, etc.
*1
TIMEOUT SW00BD, SW00C5
Too-short data link monitoring
time, cable fault, noise, etc.
*1
Exceeding 2Kb SW00BE, SW00C6 Cable fault, hardware fault,
noise, etc.
*1
DPLL ERROR SW00BF, SW00C7

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English