Mitsubishi Electric MELSEC FX Series - Setting the Target Position

Drive mechanism Components of Positioning Control and their Roles
FX Positioning Control Systems 3 - 13
3.3.2 Setting the target position
In positioning control, the target position can be set by the following two methods, specified by the
controller’s parameter settings. (Available command units are "mm," "inch", "degree", or "pulse".)
Absolute method
In this method, a point (absolute address) is specified for positioning while the zero point is regarded
as the reference. The start point is arbitrary.
Incremental method
In this method, positioning is performed through specification of the movement direction and the
movement quantity while the current stop position is regarded as the start point.
332010da.eps
Fig. 3-10: Setting the target position, absolute method
332020da.eps
Fig. 3-11: Setting the target position, incremental method
Address 100
Address 150
Address 150
Address 150
Address 300
Address 100
Startpoint
Endpoint
0
Zero point
100
Point A
150
Point B
300
Point C
Address 100
Startpoint
Endpoint
Movement quantity
+100
Movement quantity
-100
Movement quantity +100
Movement quantity +100
Movement quantity -150
Movement quantity -100
Movement quantity +50
0
Zero point
100
Point A
150
Point B
300
Point C