Siemens simatic et 200s Operating Instructions Manual page 139

Execution of a Reference Point Run Depending on Parameterization and Start Position
In a reference point run, you have to distinguish between different cases that depend on the
following:
● The start position of the drive at the start of the reference point run
● The assigned parameter start direction
● The assigned parameter reference signal
● The assigned parameter reference switch.
Example 1: Search for Reference Point Run with Reducing Cam and Zero Mark
● Start position: between the minus limit switch and the reducing cam
● Start direction: Plus
● Reference signal: Reference switch and zero mark
● Reference switch: Reduction cam towards plus
Figure 4-13
You can also carry out synchronization using the reducing cam without a zero mark.
If the start position is on the reducing cam, the 1PosInc/Analog controls the drive directly in
creep feed mode in the referencing direction.
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Search for Reference Point Run with Reducing Cam and Zero Mark
1PosInc/Analog
4.6 Functions of the 1PosInc/Analog
139