Mitsubishi 00JCPU User Manual page 276

(7) Self-diagnostics list
The following table shows the self-diagnostics performed by the CPU module.
To check the error messages in the "Error message" column of Table6.27, select [Diagnostics]
diagnostics] of GX Developer.
Diagnostics
message
MAIN CPU
CPU error
DOWN
END
END NOT
instruction
EXECUTE
not executed
SFC program
SFCP. END
execution
ERROR
error
RAM
RAM check
ERROR
Tracking
memory and
TRK. CIR.
tracking
ERROR
hardware
error
Operation OPE.CIR-
circuit check CUIT ERR.
FUSE
Fuse blown
BREAK
*1 *2
OFF
I/O interrupt I/O INT.
error ERROR
Hardware
failure
Intelligent
function SP.UNIT
module error DOWN
*1
Control bus CONTROL-
error BUS ERR.
Momentary AC/DC
power failure DOWN
Voltage drop
of power
SINGLE PS.
supply for
DOWN
redundant
base unit
6 - 96
Table6.27 Self-diagnostics list
Error
Diagnostic timing
• Always
• Execution of the END
instruction
• Execution of a SFC
program
• Power-on/reset
• Power-on/reset
• During operation
• Power-on/reset
• Execution of the END
instruction
• Always
• Occurrence of an
interrupt
• Power-on/reset
• Execution of the FROM/
TO instructions
• Execution of the
intelligent function
module dedicated
instruction
• Execution of the END
instruction
• Power-on
• Execution of END
processing
• Execution of the FROM/
TO instructions
• Execution of the
intelligent function
module dedicated
instruction
• Always
• Always
• Always
CPU LED status Basic
module model
RUN ERR.
status QCPU
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop/ Off/ Flashing/
Continue On On
Stop Off Flashing
Stop/ Off/ Flashing/
Continue On On
Stop Off Flashing
Continue On Off
Continue On On
: Self-diagnostics is performed,
[PLC
High
Process Redundant
Performance
CPU CPU
model QCPU
*4 *4
: Self-diagnostics is not performed
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