Mitsubishi Electronics manual 173

11 TROUBLESHOOTING

MELSEC-Q

Special Relay List (Continued)

ACPU	Special	Special				Applicable
Special	Relay after	Relay for	Name	Meaning	Details
						CPU
Relay	Conversion	Modification
			ZNRD instruction		• Depends on whether or not the ZNRD (word device read)
M9200	SM1200		(LRDP instruction	OFF: Not accepted	instruction has been received.
			for ACPU)	ON : Accepted	• Used in the program as an interlock for the ZNRD
			reception (for		instruction.
			master station)		• Use the RST instruction to reset.
			ZNRD instruction		• Depends on whether or not the ZNRD (word device read)
M9201	SM1201		(LRDP instruction	OFF: Not completed	instruction execution is complete.
			for ACPU)	ON : End	• Used as a condition contact for resetting SM1202 and
			completion (for		SM1203 after the ZNRD instruction is complete.
			master station)		• Use the RST instruction to reset.
			ZNWR instruction		• Depends on whether or not the ZNWR (word device
M9202	SM1202		(LWTP instruction	OFF: Not accepted	write) instruction has been received.
			for ACPU)	ON : Accepted	• Used in the program as an interlock for the ZNWR
			reception (for		instruction.
			master station)		• Use the RST instruction to reset.
			ZNWR instruction		• Depends on whether or not the ZNWR (word device
			(LWTP instruction	OFF: Not completed	write) instruction execution is complete.
M9203	SM1203		for ACPU)	ON : End	• Used as a condition contact to reset SM1202 and
			completion (for		SM1203 after the ZNWR instruction is complete.
			master station)		• Use the RST instruction to reset.
			ZNRD instruction
M9204	SM1204		(LRDP instruction	OFF: Not completed	On indicates that the ZNRD instruction is complete at the
			for ACPU)	ON : End	local station.
			reception (for local
			station)
			ZNWR instruction
M9205	SM1205		(LWTP instruction	OFF: Not completed	On indicates that the ZNWR instruction is complete at the
			for ACPU)	ON : End	local station.
			recep-tion (for
			local station)
M9206	SM1206		Host station link	OFF: Normal	Depends on whether or not the link parameter setting of
			parameter error	ON : Abnormal	the host is valid.
					Depends on whether or not the link parameter setting of	QnA
M9207	SM1207		Link parameter	OFF: YES	the master station in tier two matches that of the master
			check results	ON : NO	station in tier three in a three-tier system.
					(Valid only for the master stations in a three-tier system.)
			Sets master		• Depends on whether or not the B and W data controlled
					by higher-link master station (host station) is sent to
			station B and W
				OFF: Transmits to tier2 and	lower-link local stations (tertiary stations).
			transmission
M9208	SM1208			tier 3	• When SM1208 is OFF .......B and W of host station is
			range (for lower
				ON : Transmits to tier2 only	sent to tertiary stations.
			link master
					• When SM1208 is ON .........B and W of host station is
			stations only)
					not sent to tertiary stations.
			Link parameter		• Set to ON not to match B and W of the higher and lower
M9209	SM1209		check command	OFF: Executing the check	links. (When SM1209 is ON, the link parameters of the
			(for lower link	function	higher and lower links are not checked.)
			master stations	ON : Check non-execution	• When SM1209 is OFF, the link parameters of the higher
			only)		and lower links are checked.
M9210	SM1210		Link card error (for	OFF: Normal	Depends on presence or absence of the link card
			master station)	ON : Abnormal	hardware error. Judged by the CPU.
M9211	SM1211		Link module error	OFF: Normal	Depends on presence or absence of the link card
			(for local station	ON : Abnormal	hardware error. Judged by the CPU.
			use)
				OFF: Online
M9224	SM1224		Link status	ON : Offline,station-to-station	Depends on whether the master station is online or offline
				test, or self-loopback	or is in station-to-station test or self-loopback test mode.
				test
M9225	SM1225		Forward loop error	OFF: Normal	Depends on the error condition of the forward loop line.
				ON : Abnormal
M9226	SM1226		Reverse loop error	OFF: Normal	Depends on the error condition of the reverse loop line.
				ON : Abnormal
M9227	SM1227			OFF: Not being executed	Depends on whether or not the master station is executing
			Loop test status	ON : Forward or reverse loop
					a forward or a reverse loop test.
				test execution underway
M9232	SM1232		Local station	OFF: RUN or STEP RUN	Depends on whether or not a local station is in STOP or
				status
			operation status		PAUSE mode.
				ON : STOP or PAUSE status

11 - 57 11 - 57