Mitsubishi QJ71MB91 - CHAPTER11 TROUBLESHOOTING; 11.1 Troubleshooting

11 - 1
11.1 Troubleshooting
11
TROUBLESHOOTING
CHAPTER11 TROUBLESHOOTING
This chapter explains the details of errors and corrective actions.
11.1 Troubleshooting
(1) Troubleshooting of errors indicated by LEDs
(Continued on next page)
Table11.1 Troubleshooting list of errors indicated by LEDs
No. Symptom Check point Corrective action Reference
1 The RUN LED turned off.
Check the mounting status of the
QJ71MB91.
Switch OFF the power and remount the
QJ71MB91.
Section 6.1
Check the power supply capacity. Replace the power supply module. Section 3.1
Check the programmable controller CPU
for an error.
If the programmable controller CPU is
faulty, take corrective actions according to
the QCPU User's Manual (Hardware
Design, Maintenance and Inspection).
-
Check for a watch dog timer error (X1F).
• Reset the programmable controller CPU
or reapply the power.
• If the problem persists even after the
reset, a possible cause is a hardware
fault. Perform a hardware test, and
replace the QJ71MB91.
Section 6.4.1
2 The ERR.LED turned on.
Check the operation mode setting value of
the intelligent function module switch.
Check the setting range of each intelligent
function module switch, and correct the
value.
Section 6.6
Check the transmission setting status
value of the intelligent function module
switch.
Check the station number setting value of
the intelligent function module switch.
Check that the QJ71MB91 is not mounted
with an A-mode QCPU.
Mount the QJ71MB91 on a Q-mode
QCPU.
Section 2.1
Check if the module is in the hardware or
self-loopback test mode.
• Perform the test again after checking
the mounting status of the QJ71MB91.
• If the ERR.LED turns on again, a
possible cause is a hardware fault.
Replace the QJ71MB91.
Section 6.4.1
Section 6.4.2
Refer to "The RUN LED turned off."
This section
(1)-1
Check if the automatic communication
parameter setting, error completed (X5/
XD) is ON.
Refer to "Automatic communication
parameter setting, error completed (X5/
XD) turned on."
This section
(2)-3
Check if the MODBUS device
assignment parameter setting, error
completed (X9) is ON.
Refer to "MODBUS device assignment
parameter setting, error completed (X9)
turned on."
This section
(2)-4