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9 TROUBLESHOOTING
9 TROUBLESHOOTING
The following is the troubleshooting of the QJ71PB93D.
9.1 LED-indicated Error Causes and Actions
The following indicates the causes of the errors indicated by the LEDs and the actions
to be taken.
LED
Status
RUN
Off
ERR.
On
BF
On
9.2 Checks and Actions for Network-related Faults
Checked Area
Transmission path
LED
Module error information of
buffer memory (Buffer memory
address: 7F8
)
H
Master station
9 - 1
POINT
When any error has occurred, first check the CPU module or power supply module
for a fault.
When the CPU module has no fault, refer to Sections 9.1 to 9.4.
Watchdog timer error occurred.
Parameter setting error or module error occurred.
Communication error was detected or data
communication is not yet started.
Use three or less repeaters to be relayed (Refer to Section 3.1).
Use each segment within the specified length (Refer to Section 3.1).
Install one bus terminator at each end (Refer to Section 3.1).
Use within the specified number of devices connected in each segment
(Refer to Section 3.1).
Check the cable wiring and check for open cable (Refer to Section 5.7).
Check whether the cables are of Type A or not.
Confirm the error with the on/off status of the LEDs and take the corrective
action (Refer to Section 9.1).
Confirm the error with the error code and take the corrective action
(Refer to Section 9.4).
Confirm the error of the master station and take the corrective action
(Refer to the master station manual).
Cause
Action
MELSEC-Q
Action
Please consult your local
Mitsubishi representative.
Check the error code and take
corrective actions. (Refer to
Section 9.4)
Check the parameter setting
and cable wiring and check for
open cable and like. (Refer to
Section 9.2)
Start data communication.
Set the station number.
9
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