
21. AXES CONTROL
B–63522EN/02
NC FUNCTION
306
In a closed loop system equipped with a built–in absolute position
detector (serial pulse coder) and incremental linear scale, a coordinate
system is established at power–up by using absolute position data from
the built–in absolute position detector. The subsequent position control
is performed using incremental data of the linear scale. Since the position
immediately after power–up is a temporary position, manual reference
position return is needed to obtain a correct position.
When this function is used, a stroke limit check is enabled even before
reference position return, although the position at power–up is an
approximate position. Note that this function does not use the
incremental linear scale as an absolute position detector.
This function is optional.
Serial pulse coder
(absolute position detector)
Linear scale
(incremental)
Ordinary position control
CNC
Absolute position detection at power–up
Fig. 21.25 System using the temporary coordinate setting function
21.25
TEMPORARY
ABSOLUTE
COORDINATE
SETTING