User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 83
11.3.5 Error code list (5000 to 5999)
Error
code
Error contents and cause Corrective action
LED status
CPU
status
Corre-
sponding
CPU
RUN ERR.
5000
WDT ERROR
The scan time of the initial execution type pro-
gram exceeded the initial execution monitoring
time specified in the PLC RAS setting of the PLC
parameter.
 Collateral information

Common Information: Time (value set)
 Individual Information: Time (value actually
measured)
 Diagnostic Timing
Always
– Read the individual information of the error
from GX (IEC) Developer, check its value
(time), and shorten the scan time.
– Change the initial execution monitoring time
or the WDT value in the PLC RAS setting of
the PLC parameter.
– Resolve the endless loop caused by jump
transition.
OFF Flicker Stop Qn(H)
QnPH
QnPRH
QnU
WDT ERROR
– The power supply of the standby system is
turned OFF.
– The tracking cable is disconnected or con-
nected without turning off or resetting the
standby system.
– The tracking cable is not secured by the con-
nector fixing screws.
 Collateral information

Common Information: Time (value set)
 Individual Information: Time (value actually
measured)
 Diagnostic Timing
Always
– Since power-off of the standby system
increases the control system scan time, reset
the WDT value, taking the increase of the con-
trol system scan time into consideration.
– When the tracking cable is disconnected dur-
ing operation, securely connect it and restart
the CPU module. If the same error is dis-
played again, the tracking cable or CPU mod-
ule has a hardware fault.
Contact your local Mitsubishi representative.
OFF Flicker Stop QnPRH
5001
WDT ERROR
The scan time of the program exceeded the WDT
value specified in the PLC RAS setting of the PLC
parameter.
 Collateral information

Common Information: Time (value set)
 Individual Information: Time (value actually
measured)
 Diagnostic Timing
Always
– Read the individual information of the error
from GX (IEC) Developer, check its value
(time), and shorten the scan time.
– Change the initial execution monitoring time
or the WDT value in the PLC RAS setting of
the PLC parameter.
– Resolve the endless loop caused by jump
transition.
OFF Flicker Stop )
WDT ERROR
– The power supply of the standby system is
turned OFF.
– The tracking cable is disconnected or con-
nected without turning off or resetting the
standby system.
– The tracking cable is not secured by the con-
nector fixing screws.
 Collateral information

Common Information: Time (value set)
 Individual Information: Time (value actually
measured)
 Diagnostic Timing
Always
– Since power-off of the standby system
increases the control system scan time, reset
the WDT value, taking the increase of the con-
trol system scan time into consideration.
– When the tracking cable is disconnected dur-
ing operation, securely connect it and restart
the CPU module. If the same error is dis-
played again, the tracking cable or CPU mod-
ule has a hardware fault.
Contact your local Mitsubishi representative.
OFF Flicker Stop QnPRH
Tab. 11-7: Error code list (5000 to 5999) for PLC CPUs of MELSEC System Q