Siemens Sinumerik 840D sl Programming Manual page 23

Example
N10 G1 X10. Y100. F1000 G18
N20 A140 C7.5
N30 X80. Y70. A95.824, R10
Figure 2-5
ISO dialect mode
In the ISO dialect original, the C address can be used as axis name as well as for denoting a
chamfer on the contour.
The Address R can either be a cycle parameter or an identifier of the radius of a contour.
To differentiate between these two possibilities, a comma "," must be used while
programming the contour definition before the address "R" or "C".
Siemens mode
The identifiers of chamfer and radius are defined in the Siemens mode using the machine
data. Name conflicts can be avoided this way. There should be no comma before the
identifier of the radius or chamfer. The following machine data (MD) is used:
MD for the radius: $MN_RADIUS_NAME
MD for the chamfer: $MN_CHAMFER_NAME
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
3 straight lines
Drive commands
2.1 Interpolation commands
23