Mitsubishi Electronics manual 174

11 TROUBLESHOOTING

MELSEC-Q

Special Relay List (Continued)

ACPU	Special	Special				Applicable
Special	Relay after	Relay for	Name	Meaning	Details
						CPU
Relay	Conversion	Modification
M9233	SM1233		Local station	OFF: No errors	Depends on whether or not a local station has detected an
			error detect
				ON : Error detection	error in another station.
			status
			Local station,
M9235	SM1235		remote I/O	OFF: No errors	Depends on whether or not a local or a remote I/O station
			station parameter
				ON : Error detection	has detected any link parameter error in the master station
			error detect
			status
			Local station,
			remote I/O	OFF: No communications	Depends on the results of initial communication between a
M9236	SM1236		station initial	ON : Communications
					local or remote I/O station and the master station.
			communications	underway
			status
M9237	SM1237		Local station,	OFF: Normal	Depends on the error condition of a local or remote I/O
			remote I/O
				ON : Abnormal	station.
			station error
			Local station,
M9238	SM1238		remote I/O	OFF: Normal	Depends on the error condition of the forward and reverse
			station forward or	ON : Abnormal	loop lines of a local or a remote I/O station.
			reverse loop error
				OFF: Online
M9240	SM1240		Link status	ON : Offline, station-to-	Depends on whether the local station is online or offline, or
				stationtest, or self-	is in station-to-station test or self-loopback test mode.
				loopback test
M9241	SM1241		Forward loop line	OFF: Normal	Depends on the error condition of the forward loop line.
			error	ON : Abnormal		QnA
M9242	SM1242		Reverse loop line	OFF: Normal	Depends on the error condition of the reverse loop line.
			error	ON : Abnormal
M9243	SM1243		Loopback	OFF: Loopback not being	Depends on whether or not loopback is occurring at the
				conducted
			implementation		local station.
				ON : Loopback implementation
M9246	SM1246		Data not received	OFF: Reception	Depends on whether or not data has been received from
				ON : No reception	the master station.
M9247	SM1247		Data not received	OFF: Reception	Depends on whether or not a tier three station has
				ON : No reception	received data from its master station in a three-tier system.
M9250	SM1250		Parameters not	OFF: Reception	Depends on whether or not link parameters have been
			received	ON : No reception	received from the master station.
M9251	SM1251		Link relay	OFF: Normal	Depands on the data link condition at the local station.
				ON : Abnormal
M9252	SM1252			OFF: Not being executed	Depends on whether or not the local station is executing a
			Loop test status	ON : Forward or reverse loop
					forward or a reverse loop test.
				test execution underway
M9253	SM1253		Master station	OFF: RUN or STEP RUN	Depends on whether or not the master station is in STOP
				status
			operation status		or PAUSE mode.
				ON : STOP or PAUSE status
			Local station	OFF: RUN or STEP RUN
			other than host		Depends on whether or not a local station other than the
M9254	SM1254			status
			station operation		host is in STOP or PAUSE mode.
				ON : STOP or PAUSE status
			status
M9255	SM1255		Local station	OFF: Normal	Depends on whether or not a local station other than the
			other than host
				ON : Abnormal	host is in error.
			station error

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