Siemens SINUMERIK 840C Installation Instructions Manual page 195

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.2 General machine data (general data)
7
Default value
5
Before a circular block is processed, the NC checks the "correctness" of the programmed
values by determining the difference between the radii for the starting and end positions. If the
difference exceeds the upper limit defined above, the block is not cleared for processing and
alarm 2048 (circle end position error) is displayed.
If the difference is less than but not equal to zero, the circle centre parameters are corrected,
as it is then assumed that the end position has been correctly programmed. The circle is then
traversed on the basis of the new centre point.
A
M =programmed circle centre
p
M =corrected circle centre
k
6–10
Circle end position monitoring
Lower input limit Upper input limit
+0
R
Progr.
M
k
K2
M K1
p
K1, K2 circle centre offset M
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Siemens AG 1992 All Rights Reserved
Units
32 000 units (IS)
Corrected circle
Programmed
circle
- M
p k
6FC5197- AA50
SINUMERIK 840C (IA)
03.95
Active in
next block
E