Mitsubishi Q2ACPU User Manual page 162

9. MAINTENANCE FUNCTION
Diagnosis Item
CPU module error
END instruction not executed
RAM check
Operation circuit check
Fuse blown
*1
(Default stop)
I/O interrupt error
Special function module error
Control bus error
Occurrence of momentary
power interruption
Low battery
I/O module verification
*1
(Default stop)
Special function module
allocation error
Special function module
access error
*1
(Default stop)
No parameters
Boot error
Memory card operation error
*1
(Default stop)
File setting error
File access error
*1
(Default stop)
Unable to execute instruction
Parameter setting check
Link parameter error
SFC parameter error
Self-diagnostics list
Diagnosis Timing
Always
When executing END instruction
At power-ON or RESET
At power-ON or RESET
When executing END instruction
*2
(Default check executed)
When interruption occurs
• At power-ON or RESET
• When executing FROM/TO instruction
• At power-ON or RESET
• When executing FROM/TO instruction
Always
Always (Default check executed)
When executing END instruction
*2
(Default check executed)
• When power is ON or RESET
• When switching from STOP to RUN
When executing FROM/TO instruction
When power is ON or RESET
When power is ON or RESET
When memory card is inserted/removed
When power is ON or RESET
When executing each instruction
When power is ON or RESET
• When power is ON or RESET
• When switching from STOP to RUN
• When power is ON or RESET
• When switching from STOP to RUN
When switching from STOP to RUN
*1 Can be changed to operation continues by GPP function parameter setting.
*2 GPP function parameters can be set so that no check is performed, or so that no check is
performed when SM251 is ON.
*3 GPP function parameters can be set so that no check is performed.
LED Status
CPU Module
Status
RUN
Stop OFF
Stop OFF
Stop OFF
Stop OFF
Stop/
OFF/ON
Continue
Stop OFF
Stop OFF
Stop OFF
Continue ON
*3
Continue ON
Stop/
OFF/ON
Continue
Stop OFF
Stop/
OFF/ON
Continue
Stop OFF
Stop OFF
Stop/
OFF/ON
Continue
Stop OFF
Stop/
OFF/ON
Continue
Stop OFF
Stop OFF
Stop OFF
Stop OFF
9 - 6
LED Indicator Message
(Q3A/Q4ACPU Only)
ERROR
Flickers MAIN CPU DOWN
Flickers END NOT EXECUTE
Flickers RAM ERROR
Flickers OPE.CIRCUIT ERR.
Flickering/
FUSE BREAK OFF
ON
Flickers I/O INT.ERROR
Flickers SP.UNIT DOWN
Flickers CONTROL-BUS ERR.
OFF AC DOWN
OFF BATTERY ERROR
Flickering/
UNIT VERIFY ERR.
ON
Flickers SP.UNIT LAY.ERR.
Flickering/
SP.UNIT ERROR
ON
Flickers MISSING PARA.
Flickers BOOT ERROR
Flickering/
ICM.OPE ERROR
ON
Flickers FILE SET ERROR
Flickering/
FILE OPE.ERROR
ON
Flickers CAN'T EXE .PRG.
Flickers PARAMETER ERROR
Flickers LINK PARA.ERROR
Flickers SFC PARA.ERROR