Mitsubishi Electronics QD75D, QD75P Designating the positioning address, Absolute system

9MAJOR POSITIONING CONTROL

9.1.3 Designating the positioning address

MELSEC-Q

The following shows the two methods for commanding the position in control using positioning data.

Absolute system

Positioning is carried out to a designated position (absolute address) having the OP as a reference. This address is regarded as the positioning address. (The start point can be anywhere.)

		Address	Start point
Address		100	End point
100	Address
	150		Address
			300
	Address 150
		Address 100
		Address 150
OP	100	150	300
	A point	B point	C point
(Reference point)

Within the stroke limit range

Fig. 9.6 Absolute system positioning

Incremental system

The position where the machine is currently stopped is regarded as the start point, and positioning is carried out for a designated movement amount in a designated movement direction.

	Movement amount	Start point
Movement amount	-100	End point
+100
Movement amount +100	Movement amount
Movement	+100
amount -150
Movement amount-100	Movement amount+50

100	150	300
A point	B point	C point

Within the stroke limit range

Fig. 9.7 Incremental system positioning

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