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Thanks for the answer
The PIN for HAL is what I'm looking for.
The whole thing should be monitored by my comp. file mentioned above.
The spindle support is only retracted when the axle passes, and this is exactly when I want to monitor whether the cylinder is retracted.
I have no idea how to implement this in the comp. file.
I think it should be an abreage which checks whether the cylinder is really in the end bearing after the command to retract the cylinder.