Mitsubishi Electronics manual 159

11 TROUBLESHOOTING

MELSEC-Q

Special Relay List

(1) Diagnostic Information

Number	Name		Meaning		Explanation	Set by	Corresponding	Applicable
						(When Set)	ACPU	CPU
							M9
				• ON if diagnosis results show error occurrence
		OFF: No error		(Includes when an annunciator is ON, and when an error
SM0	Diagnostic errors			is detected with CHK instruction)		S (Error)	New
		ON	: Error
				• Stays ON subsequently even if normal operations
				restored
				• Comes ON when an error occurs as a result of self-
	Self-diagnosis	OFF: No self-diagnosis		diagnosis. (Does not include when annunciator is ON or
SM1			errors	when error is detected by CHK instruction.)		S (Error)	M9008
	error
		ON	: Self-diagnosis	• Stays ON subsequently even if normal operations
				restored				+Rem
		OFF: No error common
SM5	Error common		information	• When SM0 is ON, ON if there is error common		S (Error)	New
	information	ON	: Error common	information
			information
		OFF: No error common
SM16	Error individual		information	• When SM0 is ON, ON if there is error individual		S (Error)	New
	information	ON	: Error common	information
			information
SM50	Error reset	OFF	ON : Error reset	• Conducts error reset operation		U	New
				• ON if battery voltage at CPU module or memory card
SM51	Battery low latch	OFF: Normal		drops below rated value. Stays ON subsequently even		S (Error)	M9007
		ON	: Battery low	after normal operation is restored
				• Synchronous with BAT. ALA/BAT. LED
SM52	Battery low	OFF: Normal		• Same as SM51, but goes OFF subsequently when		S (Error)	M9006
		ON	: Battery low	battery voltage returns to normal.
				• Comes ON it a momentary power interruption of less
				than 20ms occurred during use of the AC power supply
		OFF: AC/DC DOWN not		module, and reset by turning the power OFF, then ON.
				• Comes ON if a momentary power interruption of less
	AC/DC DOWN		detected
SM53				than 10ms occurred during use of the DC power supply		S (Error)	M9005	QCPU
	detection	ON : AC/DC DOWN
				module, and reset by turning power OFF, then ON.
			detected
				• Comes ON if a momentary power interruption of less
				than 1ms occurred during use of the DC power supply				QnA
				module, and reset by turning power OFF, then ON.
				• Goes ON if MINI (S3) link error is detected at even one of
SM54	MINI link errors	OFF: Normal		the installed MELSECNET/MINI master modules.		S (Error)	M9004	QnA
		ON	: Error	Stays ON subsequently even after normal operation is
				restored.
		OFF: Normal		• ON when operation error is generated
SM56	Operation Errors			• Stays ON subsequently even if normal operations		S (Error)	M9011
		ON	: Operation error
				restored
				• Comes ON even if there is only one output module with a
SM60	Blown fuse	OFF: Normal		blown fuse, and remains ON even after return to normal		S (Error)	M9000
	detection	ON	: Module with blown fuse	• Blown fuse status is checked even for remote I/O station
				output modules.				+Rem
				• Comes ON if there is a discrepancy between the actual
	I/O module	OFF: Normal		I/O modules and the registered information when the
SM61				power is turned on		S (Error)	M9002
	verification error	ON	: Error
				• I/O module verification is also conducted for remote I/O
				station modules.
	Annunciator	OFF: Not detected				S
SM62				• Goes ON if even one annunciator F goes ON.		(Instruction	M9009
	detection	ON	: Detected
						execution)
		OFF: Not detected		• Goes ON if error is detected by CHK instruction.		S
SM80	CHK detection			• Stays ON subsequently even after normal operation is		(Instruction	New
		ON : Detected
				restored.		execution)
SM90				Corresponds to SD90			M9108
SM91				Corresponds to SD91			M9109
SM92	Startup of	OFF: Not started		Corresponds to SD92	• Goes ON when measurement of		M9110
SM93	watchdog timer			Corresponds to SD93			M9111
			(watchdog timer reset)		step transition watchdog timer is
SM94	for step transition			Corresponds to SD94			M9112
		ON : Started			commenced.	U
SM95	(Enabled only			Corresponds to SD95			M9113
			(watchdog timer		• Resets watchdog timer when it
SM96	when SFC			Corresponds to SD96			M9114
			started)		goes OFF.
	program exists)
SM97				Corresponds to SD97			New
SM98				Corresponds to SD98			New
SM99				Corresponds to SD99			New
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