Festo Контроллер позиционирования CPX-CMAX - Manual (Page 351)

B. Basic controlling principles
B−9
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
B.2 Dimension reference system for pneumatic drives
B.2.1 Dimension reference system with absolute measuring system
System of units for linear drives with absolute measuring system
1
CZ/AZ
a’ b c
PZ
d
e
TP/AP USE LSE
2
Positions increasing in size, positive" travel, right−hand" travel
SZ
SZ Sensor/measuring system zero point (sensor zero point) a’ Offset axis zero point
(distance AZ − SZ so far
CZ Cylinder zero point, stop
(distance AZ − SZ, so far
mounting offset")
AZ Axis zero point b Offset project zero point
PZ Project zero point c Offset target/actual position
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/7: Dimension reference system for pneumatic drives with absolute measuring system
The vectors a’ to e are user specifications provided these
cannot be recognised (e. g. cylinder and measuring system
length with the DGCI).
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.