Mitsubishi A1SJH User Manual page 48

4. AnSHCPU MODULE
Diagnosis
Memory error
Instruction code check
Parameter setting check
No END instruction
Instruction execution
disable
Format
(CHK instruction) check
Instruction execution
disable
CPU error
RAM check
Operation circuit check
Watchdog error check
END instruction not
executed
Endless loop execution
I/O error
I/O module verify
Fuse blown
Special function module
error
Control bus check
Special function module
error
Link module error
I/O interruption error
Special function module
assignment
Special function module
error
Link parameter error
Battery error
Battery low
Operation check error
Table 4.2 Self-diagnosis
Diagnosis timing
When the corresponding instruction is executed
When power is switched ON or a reset is executed
When switched from STOP/PAUSE to RUN
When M9056 or M9057 is switched ON
When switched from STOP/PAUSE to RUN
When CJ, SCJ, JMP, CALL(P), FOR and NEXT
instruction is executed
When switched from STOP/PAUSE to RUN
When switched from STOP/PAUSE to RUN
When an interrupt occurs
When switched from STOP/PAUSE to RUN
When power is switched ON or a reset is executed
When M9084 is switched ON during STOP
When power is switched ON or a reset is executed
When an END instruction is executed
When program processing reaches the end of the
program
At any time
When an END instruction is executed
(Not checked when M9084 is ON)
When an END instruction is executed
(Not checked when M9084 is ON)
When a FROM, TO instruction is executed
When a FROM, TO instruction is executed
When power is switched ON or a reset is executed
When switched from STOP/PAUSE to RUN
When an interruption occurs
When power is switched ON or a reset is executed
When switched from STOP/PAUSE to RUN
When a FROM, TO instruction is executed
When power is switched ON or a reset is executed
When switched from STOP/PAUSE to RUN
At any time (not checked When M9084 is ON)
When the corresponding instruction is executed
CPU
module
status
Stop
Stop
Stop
Run
Stop
Stop
Run
Run
Run
Stop
Run
4 - 8
MELSEC-A
"RUN" LED
LED display message
status
INSTRUCT. CODE
ERR.
PARAMETER ERROR
MISSING END INS.
Flashing
CAN'T EXECUTE (P)
CHK FORMAT ERR.
CAN'T EXECUTE (I)
RAM ERROR
OPE. CIRCUIT ERR.
Flashing WDT ERROR
END NOT EXECUTE
WDT ERROR
Flash-
UNIT VERIFY ERR.
ing
FUSE BREAK OFF.
ON
CONTROL-BUS ERR.
SP. UNIT DOWN
Flashing
LINK UNIT ERROR
I/O INT. ERROR
SP. UNIT LAY. ERR.
Flash-
ing SP. UNIT ERROR
ON
ON LINK PARA. ERROR
ON BATTERY ERROR
Flash-
ing OPERATION ERROR
ON