Siemens SINUMERIK 808D Programming And Operating Manual page 115

Note
A block with path zero is also taken as interruption!
Changeover between G41 and G42 in operation with cutter radius compensation
The offset direction (left or right) can be changed over directly without having to leave the compensation mode.
The new offset direction is approached with the next block, through an axis motion.
Changeover of the tool offset direction at block start and end of block:
Deselection of the tool offset
There are two methods of deselecting the tool offset, which can be set through the setting data 42494
$SC_CUTCOM_ACT_DEACT_CTRL.
● Method A:
If G40 is programmed in a block without axis motion, the tool radius compensation is deselected only with the next block
through an axis motion.
● Method B:
If G40 is programmed in a block without axis motion, the tool radius compensation is deselected immediately. In other
words, that linear interpolation (G00 or G01) must be active in the block, because the tool radius compensation can be
deselected only with a linear movement. An alarm is triggered if no linear interpolation is active during the selection of the
tool radius compensation.
Programming and Operating Manual (ISO Turning/Milling)
01/2017
115