Siemens SIMATIC FM 453 Manual page 307

Variants in Tool Tool offset is made up of two correction-value components:
Offset
Fig. 10-4 Tool Offset
Notes to the figure:
The tool offset thus consists of the tool length offset and the tool length wear
value:
D = D
D
D
D
DV
D
D
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Tool length offset
The tool length offset is the actual tool length from tool zero to the tool
tip.
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:
by specifying a fixed wear value
Additively:
by adding an "offset value" to the current tool length wear
value contents.
Tool new Tool wear a
É É
Tool zero
D
L
– D
L V
= D + D
V Vabs Vadd
– Tool offset
– Tool length offset (positive or negative)
L
Tool length wear value (positive or negative)
–
Wear, absolute (positive or negative)
Vabs –
Wear, additive (positive or negative)
Vadd –
Writing Traversing Programs
Tool wear b
É É É É
É É
D
Vabs
D D
Vadd V
10-11