Reference Point Approach - Siemens SIMATIC S5 Manual

Example
A zero offset of 100 mm in the reverse direction was executed.
The mode "set reference point" was executed. The coordinate of the reference point in the ma-
chine data is O mm.
The actual value following "set reference point" is indicated as 100 mm.
[ Status before executing mode 5 "set reference point"
Software limit switch
not activated
Status after executing mode 5 "set reference point"
Software limit switch
Indicated
coordinates
Coordinates from
machine data
Fig. 4/6 Mode 5 with a zero offset
The reference point is lost when the positioning module is switched on and must be calculated
again,
The calibration of the axis is triggered by specifying operating mode 5 and the command "start".
You must also decide whether the reference point is to be established using a reference point ap-
proach or by setting the reference point.
By starting mode 5, an existing reference point is cleared or overwritten

Reference Point Approach

4.2.4
Hardware requirements:
A reference signal generated by an NO contact (usually BERO) which has its faliing edge
in the "reference point direction".
Possibly hardware limit switches, which restrict the traversing range and trigger the rever-
sal of direction during the reference point approach.
Description of the Individual Operating Modes
Reference edge
Actual position
Software limit switch
100
-100
0
-200
1
Signal:
reference point cleared
200
reference point set
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