Siemens SIMATIC S7-1200 Function Manual page 513

The preassignment of values in the UserData structure does not represent a valid
configuration. Change the tags to valid values so that the tags can be used for the
interpolation calculation.
Note
If more than the maximum number of 50 points are needed for your application, use two or
more instances of Polyline.
PID control
Function Manual, 03/2017, A5E35300227-AC
Instructions
9.5 Polyline
513