Mitsubishi Electronics QD75P To 600, 7000 to 7004, and 9001 to 9004, Position switching control

15 TROUBLESHOOTING

MELSEC-Q

Classification	Error	Error name	Error	Operation status at error occurrence
of errors	code
			<When blocks are started
			simultaneously>
			• The partner axis for simultaneous
			start is BUSY.
			<When multiple axes are started and
			controlled simultaneously>	At start: The system will not operate.
	501	Error before	• The partner axis for simultaneous	During operation:
		simultaneous start	start is BUSY.	The system stops
			• The "Simultaneous start axis start	immediately.
			data No." of the start axis is 0 or is
			outside the setting range.
			• The "Simultaneous start axis start
			data No." of those axes other than
			the start axis is outside the setting
Positioning			range.
			• The positioning data No. tried to be
operation
			executed is outside the ranges of 1
			to 600, 7000 to 7004, and 9001 to
			9004.
	502	Illegal data No.	• The designation of a JUMP	The positioning data is not executed.
			destination is executed currently.
			• The designation of a JUMP
			destination is outside the ranges of
			1 to 600.
			• At the start of positioning, a current
			speed (–1) is set for the command
			speed of the positioning data to be
	503	No command speed	initially executed.	At the start of positioning, operation
			• The current speed is set by speed	does not start.
			control.
			• The current speed is set for speed-
			position switching control.

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