Siemens SIMATIC S5 Manual page 80

Machine Data, Modes and Traversing Programs
Note:
The software limit switches are active only when a valid reference point is set.
Target specifications outside the traversing range are not processed. The drive is
decelerated at the software limit switches. Different values may be specified in
the machine data for forward and reverse deceleration.
Start/end of traversing range (rotary axis only)
100 mm
Figure 5-3. Rotary Axis, Programmable in mm/inch/deg
In the case of a rotary axis, the values define the limits of the display range. The
start and the end of the traversing range are at the same physical location.
At the range limits, the display changes
• from the start value to the end value
or
• from the end value to the start value
depending on the direction of rotation.
Absolute target specifications must lie within this range, while relative specifica-
tions may exceed it.
The hardware limit switches remain in force as additional protection for the drive
system.
5-8
Start/end of
traversing
range
110 mm 0 10 mm
IP 266
EWA 4NEB 812 6057-02