Siemens SIMOTION D4x5-2 DP/PN Operating Instructions Manual page 244

TLS control function description
7.2 TLS modes and TLS functions
Saving zero positions
When the "save_zero" control bit (STW1_PLC_TLS, bit 0) is set, the current position of each
cylinder is saved as its zero position. These positions remain saved even when the SIMOTION
system is switched off.
Note
The current positions of the cylinders are saved as zero positions only when the cylinders are
stationary.
Use this function to store the current position of the spreader/container and thus define a zero
position.
The zero positions (but not the mid-positions) are relevant for calculating the trim, list and skew
positions.
Start of "Go to zero positions"
Up to four cylinders at once can be moved simultaneously to their zero position. For this
purpose, the cylinders are either retracted or extended depending on their "current position"
and "zero position" (target position).
The following examples of cylinder movements explain this process:
● Cylinder A is retracted.
● Cylinders B and C are extended.
● Cylinder D is already in its zero position and is not moved.
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SC integrated STS, GSU
Operating Instructions, 07/2019, A5E48271265B AA