Siemens SIMATIC FM 353, Manual

Page: 295 / 361

Writing Traversing Programs
10-13
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Direction of tool offset
The functions G44 ( − ) and G43 (+) correct the position value in such a way that the
tool tip reaches the programmed set position.
S Negative tool offset G44
As a rule, the tool points to the workpiece in a negative direction. With the in-
feed adjustment, the positioning value (traversing path) becomes smaller.
Referred to the measuring system, the following position is thus approached:
X
ms
= X
set
+ (D)
X
ms
− Position of measuring system
X
set
− Programmed set position
D − Tool offset
S Positive tool offset G43
The positioning value (traversing path) becomes greater with the infeed adjust-
ment. The position value is corrected by:
X
ms
= X
set
− (D)
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 se-
lected, 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 positive
values may be omitted.
Name
Lower input
limit
Upper input
limit
Unit
Position − 1,000,000,000 + 1,000,000,000 MSR from MD7
Speed F
The input speed is calculated against the override. If the speed value is numeri-
cally greater than the maximum allowed speed, it is limited to the magnitude of the
machine data item. Speeds are modal and need to be re-input only when changed.
Name
Lower input
limit
Upper input
limit
Unit
Speed 10 500 000 000 MSR from MD7/min