Mitsubishi Electronics manual 167

11 TROUBLESHOOTING

MELSEC-Q

Special Relay List (Continued)

Number	Name		Meaning	Explanation	Set by	Corresponding	Applicable
					(When Set)	ACPU	CPU
						M9
SM806	Status latch	OFF: Not ready		• Goes ON when status latch is ready	S (Status	New
	preparation	ON	: Ready		change)
SM807	Status latch	OFF	ON: Latch	• Runs status latch command	U	New	QnA
	command
SM808	Status latch	OFF: Latch not completed		• Comes ON when status latch is completed.	S (Status	9055
	completion	ON	: Latch completed		change)
SM809	Status latch clear	OFF	ON: Clear	• Enable next status latch	U	New
SM810	Program trace	OFF	: Not ready	• Goes ON when program trace is ready	S (Status	New
	preparation	ON	: Ready		change)
SM811	Start program	OFF	: Suspend	• Program trace started when this goes ON	S (Status	New
	trace	ON	: Start	• Suspended when OFF (Related special M all OFF)	change)
	Program trace	OFF: Suspend
SM812	execution under			• ON when program trace execution is underway	U	New
		ON	: Start				QnA
	way
SM813	Program trace	OFF	ON: Start	• Program trace trigger goes ON when this goes from OFF	S (Status	New
	trigger			to ON (Identical to PTRA instruction execution status)	change)
SM814	After program	OFF: Not after trigger		• Goes ON after program trace trigger	S (Status	New
	trace trigger	ON	: After trigger		change)
SM815	Program trace	OFF	: Not completed	• Goes ON at completion of program trace	S (Status	New
	completion	ON : End			change)
SM820	Step trace	OFF: Not ready		• Goes ON after program trace registration, at ready.	U	New
	preparation	ON	: Ready
SM821	Step trace starts	OFF: Suspend		• When this goes ON, step trace is started	S (Status	M9182 format
		ON : Start		• Suspended when OFF (Related special M all OFF)	change)	change
	Step trace	OFF: Suspend		• Goes ON when step trace execution is underway	S (Status
SM822	execution					M9181
		ON	: Start	• Goes OFF at completion or suspension	change)
	underway
	After step trace	OFF: Not after trigger		• Goes ON if even 1 block within the step trace being	S (Status
SM823				executed is triggered.		New
	trigger	ON	: Is after first trigger		change)
				• Goes OFF when step trace is commenced.
	After Step trace	OFF: Is not after all triggers		• Goes ON if all blocks within the step trace being	S (Status
SM824				executed are triggered.		New
	trigger	ON	: Is after all triggers		change)
				• Goes OFF when step trace is commenced.
SM825	Step	OFF: Not completed		• Goes ON at step trace completion.	S (Status	M9180
	tracecompleted	ON : End		• Goes OFF when step trace is commenced.	change)
	Trace error			• Switches ON if error occurs during execution of trace.	S (Status	New	QCPU
SM826		OFF: Normal			change)
	Sampling trace	ON	: Errors	• Goes ON if error occurs during execution of sampling	S (Status	New
	error			trace.	change)
SM827	Status latch error	OFF: Normal		• Goes ON if error occurs during execution of status latch.	S (Status	New	QnA
		ON	: Errors		change)
SM828	Program trace	OFF: Normal		• Goes ON if error occurs during execution of program	S (Status	New
	error	ON	: Errors	trace.	change)

(8) Latch area

Number	Name		Meaning	Explanation	Set by	Corresponding	Applicable
					(When Set)	ACPU	CPU
						M9
SM900	Power cut file	OFF: No power cut file		• Goes ON if a file is present during access when power is	S/U (Status	New	QnA
		ON	: Power cut file present	interrupted.	change)
		OFF: Keyboard input			S
	RKEY		notregistered	• Goes ON at registration of keyboard input.
SM910		ON			(Instruction	New
	registration flag		: Keyboard input	OFF if keyboard input is not registered.	execution)
			registered

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