Path Calculation - Siemens SINUMERIK 880 Programming Manual

3 Directions of Movements, Dimensioning

3.6 Path calculation

3.6 Path calculation
The path calculation determines the distance to be travelled within a block, taking all offsets
and compensations into consideration.
The formula is generally as follows:
Path = setpoint - actual value + zero offset (ZO) + tool offset (TO).
Zero offset
P2
Reference
dimension
Zero offset
(set value)
P1
for P1
Machine Workpiece
zero zero
Actual value 1
Path calculation using absolute position data input
If incremental position data input is used, the zero offset is incorporated normally in the first
block.
Path = incremental position data + ZO + TO
If a new zero offset and a new tool offset are programmed in a new program block, the formula
is as follows:
With absolute position data input
Path = absolute position data P2 - absolute position data P1 + ZOP2 - ZOP1 +TOP2 -
TOP1
With incremental position data input
Path = incremental position data + ZOP2 - ZOP1 +TOP2 - TOP1.
3–14
Reference dimension (set value) for P2
TO P1
P1
Actual value 2
© Siemens AG 1991 All Rights Reserved
TO P2
Path
P2
Movement
6ZB5 410-0HD02
SINUMERIK 880, (PG)
05.91