Mitsubishi Q2ACPU User Manual

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

Mitsubishi Q2ACPU Specifications

General

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English