Mitsubishi Electronics QJ71C24/-R2, QJ71C24N, SH-080007 manual 268

10 TROUBLESHOOTING

MELSEC-Q

Error code								Protocol
	Error		Error Contents	Signal		Corrective action		Non
(Hexa-									Bidire-
				name			MC	Proce-
decimal)									ctional
								dure
		•	A nonexistent device was designated.		•	Check and correct the external
716FH	Device error	•	Device that cannot be specified by the	PRO		device transmit message and
			corresponding command was designated.			restart data communications.
7170H		•	Number of access points exceeded the range.	PRO
	A compatible 1C				• Check and correct the external
7171H		•	A device that cannot be designated was designated.	PRO		device transmit message and
	frame error
						restart data communications.
7172H		•	Written number of monitoring points is incorrect. For	PRO
			example, [0] was designated.
	Monitor data write	•	Monitor data was written for a CPU other than a		• Write the monitor data and use
7173H				PRO		the A compatible 1C frame to a
	error		Q/QnACPU using QnA compatible 2C/3C/4C frame.
						CPU other than a Q/QnACPU.
7E00H
to	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
7E05H
	Buffer memory	•	Transmit/receive buffer memory addresses are in		• Change the buffer memory
7E06H	address setting					addresses so that they are outside
			the special applications area.
	error					the special applications area.
7E07H
to	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
7E0AH
		•	A nonexistent command or subcommand was		• Check and correct the external
7E40H	Command error			PRO		device transmit message and
			designated.
						restart data communications.
		•	A data length exceeding the number of points that		•	Check and correct the external
7E41H	Data length error		can communicate during random read/write was	PRO		device transmit message and
			designated.			restart data communications.
		•	Number of requested points exceeds the range for		• Check and correct the external
7E42H	Error count error			PRO		device transmit message and
			the command.
						restart data communications.
		•	A nonexistent device was designated.		•	Check and correct the external
7E43H	Device error	•	Device that cannot be specified by the	PRO		device transmit message and
			corresponding command was designated.			restart data communications.
					• Make the timer 1 monitoring
7E44H	Timer 1 time-out	•	A response message was not returned within the	C/N		time longer.
					•	When accessing another
	error		response monitoring time (timer 1) monitoring time.
						station's CPU, check if the
						routing parameters match.
7E46H	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
					• Do not issue continuous
						requests from the external
7E47H	Continuous request	•	The next request was received before a response	PRO		device.
	error		message was returned for the preceding request.		•	Set the timer 1 monitoring time
						to the external device time-out
						time.
7E48H
to	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
7E4CH
					•	Make arrangements between
	Error during data	•	Mode switching was executed during data	CHn		the target device and PLC CPU
7E4DH						so that mode switching is not
	transmission		transmission.	ERR.
						executed during data
						transmission.
7E4EH	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
	Device point count				• Check and correct the external
7E4FH		•	Access point count is incorrect.	PRO		device transmit message and
	error					restart data communications.
					• Check and correct the external
7E50H	User frame No.	•	A user frame No. outside the range was designated.	PRO		device transmit message and
	designation error					restart data communications.
					• Recheck the frame No..
					• Write the frame beforehand.
7E51H	Unwritten user	•	An unwritten user frame No. was designated.	PRO	•	Change the frame No. and
	frame error					restart data communications.
					• Recheck the frame No..

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