Siemens SIMATIC FM 353 Manual page 294

Writing Traversing Programs
Variants in tool offset
Tool offset is made up of two correction-value components:
S Tool length offset
The tool length offset is the actual tool length from tool zero to the tool tip.
S Tool length wear value
The tool length wear value allows the change in tool length due to wear to be
compensated in two ways:
Absolutely:
Additively:
Tool new
É
É
Fig. 10-4
Notes to the figure:
The tool offset thus consists of the tool length compensation and the tool length
wear value:
D = D − D
L
D = D
V Vabs
D − Tool compensation
D − Tool length compensation (positive or negative)
L
D − Tool length wear value (positive or negative)
V
D − Wear, absolute (positive or negative)
Vabs
D − Wear, additive (positive or negative)
Vadd
If the additive wear is modified on-line, the FM computes the new absolute wear
and resets the additive wear to zero.
10-12
by specifying a fixed wear value
by adding an "offset value" to the current tool length wear value
contents.
Tool wear a
Tool zero
D
L
Tool offset
V
+ D
Vadd
Tool wear b
É É É
D
Vabs
FM 353 Stepper Drive Positioning Module
D
D
Vadd V
6ES7 353-1AH01-8BG0