Mitsubishi Electronics QD75P Confirming the current value, Values showing the current value

9 MAJOR POSITIONING CONTROL

9.1.4 Confirming the current value

Values showing the current value

MELSEC-Q

The following two types of addresses are used as values to show the position in the QD75.

These addresses ("current feed value" and "machine feed value") are stored in the monitor data area, and used in monitoring the current value display, etc.

	•	This is the value stored in "
			Md.20	Current feed value".
Current feed value	•	This value has an address established with a "machine OPR" as a
		reference, but the address can be changed by changing the current
		value to a new value.
	•	This value is updated every 1.8ms.
	•	This is the value stored in "
			Md.21	Machine feed value".
Machine feed value	•	This value always has an address established with a "machine OPR"
		as a reference. The address cannot be changed, even if the current
		value is changed to a new value.
	•	This value is updated every 56.8ms.

The "current feed value" and "machine feed value" are used in monitoring the current value display, etc.

V

OP

Md. 20 Current feed value	0
Md. 21 Machine feed value
	0

Current value changed to 20000 with current value changing instruction t

Address after the current value is changed is stored

1 to	10000	20000
1 to	10000

Address does not change even after the current value is changed

Fig. 9.8 Current feed value and machine feed value

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