Siemens SINUMERIK 880 Programming Manual page 68

4 Programming of Motion Blocks
4.2.2 Circular interpolation G02/G03
Incorrect input of interpolation parameters
Before a circle block is processed the NC checks that the programmed values are correct by
determining the difference in radii for the starting and end points. If the difference exceeds the
specified upper limit (MD 7) the block is not enabled for processing. Alarm 2048 (circle end
point error) is issued.
If the difference is less than the upper limit but not equal to zero the centre point parameters
are corrected since it is assumed that the end point has been correctly programmed. The
circle with the new centre point is then traversed.
A
A = Circle starting point
E = Circle end point
M = Programmed centre point
P
M = Compensated centre point
K
Principle of circle compensation
4–10
M
K
K2
M K1
P
K1, K2 > MD 7 Error
The tolerance range is
determined by one machine data.
© Siemens AG 1991 All Rights Reserved
05.91
Compensated
circle
E
Programmed circle
6ZB5 410-0HD02
SINUMERIK 880, (PG)