B.2 Dimension Reference System For Pneumatic Drives - Festo CPX Series Manual

B. Basic controlling principles
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
d
a'
SZ CZ/AZ
SZ Sensor/measuring system zero point (sensor zero point)
CZ Cylinder zero point, stop
AZ Axis zero point
PZ Project zero point
LSE Lower software end position
USE Upper software end position
TP, AP Target/actual position
Tab. B/7: Dimension reference system for pneumatic drives with absolute measuring system
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
b
LSE
Positions increasing in size, positive" travel, right−hand" travel
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.
2
1
e
c
PZ TP/AP
a'
b
c
d, e
1
2
USE
Offset axis zero point
(distance AZ − SZ, so far (distance AZ − SZ so far
mounting offset")
Offset project zero point
Offset target/actual position
Offset software end posi
tions:
Effective stroke
Cylinder/axis length
B−9