Mitsubishi Electronics QD75P, QD75D user manual Axis monitor data

5 DATA USED FOR POSITIONING CONTROL

MELSEC-Q

5.6.2 Axis monitor data

	Storage item						Storage details
		The currently commanded address is stored.
		(Different from the actual motor position during operation)
		The current position address is stored.
		If "degree" is selected as the unit, the addresses will have a ring structure for values
		between 0 and 359.9999 degrees.
Md.20	Current feed value
		•	Update timing : 1.8ms
		•	The OP address is stored when the machine OPR is completed.
		•	When the current value is changed with the current value changing function, the
			changed value is stored.
		The address of the current position according to the machine coordinates will be
		stored. (Different from the actual motor position during operation)
		Note that the current value changing function will not change the machine feed
		value.
		Under the speed control mode, the machine feed value is constantly updated
		always, irrespective of the parameter setting.
Md.21	Machine feed value
		The value will not be cleared to "0" at the beginning of fixed-feed control.
		Even if "degree" is selected as the unit, the addresses will not have a ring structure
		for values between 0 and 359.99999 degrees.
		•	Machine coordinates: Characteristic coordinates determined with machine
		•	Update timing: 56.8ms
		The command output speed of the operating workpiece is stored. (May be different
		from the actual motor speed during operation)
		•	During interpolation operation, the speed is stored in the following manner.
			Reference axis			: Composite speed or reference axis speed
Md.22	Feedrate
						(Set with		)
							Pr.20
			Interpolation axis			: 0
		•	Update timing: 56.8ms
		When an axis error is detected, the error code corresponding to the error details is
		stored.
		•	The latest error code is always stored.
Md.23	Axis error No.		(When a new axis error occurs, the error code is overwritten.)
		•
			When "		Axis error reset" (axis control data) turns ON, the axis error No. is
				Cd.5
			cleared (set to 0).

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