Function library
7-40
L
EDSVS9332P-D21 EN 3.0
7.5.4.1 Measuring systems and zero shifts
9300POS007
0
a c t . h o m e p o s i t i o n
C 1 2 2 7 ( C 1 2 2 0 / 8 )
L i m i t p o s i t i o n
n e g a t i v e
L i m i t p o s i t i o n
p o s i t i v e
C 1 2 2 4
C 1 2 2 3
0
a c t . h o m e o f f s e t
C 1 2 2 5 ( C 1 2 2 0 / 7 )
a c t . t a r g e t p o s i t i o n
C 1 2 2 0 / 1
H o m e
o s i t i o n
R e a l m e a s u r i n g s y s t e m
M a c h i n e
m e a s u r i n g
s y s t e m
Fig. 7-18 Measuring systems for absolute positioning and zero point shifting
Shifting of machine zero
Purpose
•
The reference run is to be carried out on one side of the traversing range when it is too time
consuming to approach the machine zero.
Function
•
Via the home position (C1227) the machine zero point is shifted with regard to the reference
point. The home position is set at the reference point so that with a positive home position the
machine zero point is situated in negative direction.
•
The home position (C1227) will only be accepted as “actual home position” when being in
“reference run” or “set reference point” mode.
•
The effective “actual home position” is indicated under C1220/8 and C1221/8.
Shifting of real zero
Purpose
•
The target positions must always refer e.g. to the front edge of the workpiece. This means the
real measuring system must be shifted accordingly.
Function
•
By means of the reference offset (C1225) the real zero point can be shifted with regard to the
machine zero point. The input of a positive value results in a shift of the real zero point in
positive direction.
•
The reference measure offset takes directly effect with the input. The position setpoint
(POS-SETPOS) and the actual position value (POS-ACTPOS) change in accordance with the
change of the reference offset because of the change of its reference point (real zero point).
•
The effective “actual reference offset” is indicated under C1220/7 and C1221/7.
Tip!
The input value C1225 and the actual reference offset can only be different when using the program
function ”set position value”.
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