Siemens simatic et 200s Operating Instructions Manual page 141

Example 3: Reference Point Run with Reversal of Direction at the Plus Limit Switch
● 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 4-15
If the start position is at the plus limit switch, the 1PosInc/Analog moves the drive with rapid
feed directly in the opposite direction to the assigned parameter start direction.
Example 4: Reference Point Run Only with Zero Mark
● Start position: between the minus limit switch and the plus limit switch
● Start direction: Minus
● Reference signal: Zero mark
● Reference switch: irrelevant
Figure 4-16
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Reference Point Run with Reversal of Direction at the Plus Limit Switch
Reference Point Run Only with Zero Mark
1PosInc/Analog
4.6 Functions of the 1PosInc/Analog
141