Siemens SIMATIC S7-300 Manual page 272

Writing Traversing Programs
Direction of tool The functions G44 (–) and G43 (+) correct the position value in such a way
offset
that the tool tip reaches the programmed set position.
To program a tool offset in the traversing block, at least the tool length offset
must be input. If no correction is to be applied even when the function has
been selected, the tool length offset and tool length wear value must be preset
to 0.
A tool length wear value can be deleted by an absolute input of 0.
Position X Positions may be input with a negative or positive sign. The plus sign on pos-
itive values may be omitted.
Speed F
The input speed is calculated against the override. If the speed value is nu-
merically greater than the maximum allowed speed, it is limited to the mag-
nitude of the machine data item. Speeds are self-maintaining and need to be
re-input only when changed.
10-12
Negative tool offset G44
As a rule, the tool points to the workpiece in a negative direction. With
the infeed adjustment, the positioning value (traversing path) becomes
smaller.
Referred to the measuring system, the following position is thus ap-
proached:
X = X + (D)
ms set
X – Position of measuring system
ms
X – Programmed set position
set
D – Tool offset
Positive tool offset G43
The positioning value (traversing path) becomes greater with the infeed
adjustment. The position value is corrected by:
X = X – (D)
ms set
Lower input
Name
limit
Position – 1,000,000,000
Lower input
Name
limit
Speed
10
Upper input
Unit
limit
+ 1,000,000,000 MSR from MD7
Upper input
Unit
limit
MSR from
500 000 000
MD7/min
FM 354 Servo Drive Positioning Module