Festo Контроллер позиционирования CPX-CMAX - Manual (Page 353)

B. Basic controlling principles
B−11
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
B.2.2 Dimension reference system with incremental measuring system
System of units with incremental measuring system
1
b c
PZ
d
e
TP/AP USE
2
Positions increasing in size, positive"
travel, right−hand" travel
CZ/AZ
REF
LSE
a
CZ Cylinder zero point a Offset axis zero point
offset (increm sensor:
REF Reference point, stop
offset (increm. sensor:
to the reference point)
AZ Axis zero point b Offset project zero point
PZ Project zero point c Offset target/actual posiĆ
tion
LSE Lower software end position d, e Offset software end posiĆ
tions:
USE Upper software end position 1 Effective stroke
TP, AP Target/actual position 2 Cylinder/axis length
Tab. B/9: Dimension reference system for pneumatic drives with incremental measuring
system (example of homing negative stop)
The axis zero point always has to be on the cylinder zero
point! This is necessary because the controller requires the
absolute piston position within the cylinder.
This means that the vector a must always be specified.