sina_pos with absolute encoder

Hi all,

I have a siemens motor (1fl6034-....-1LA1) with absolute encoder multi round. I would like that when I turn on machine, the tia portal reach the current motor position. until now instead the sina pos and in v assistant a warn appears: "EPOS: refernce point not set"

can someone help me to use the absolute encoder in order to know the exact position in real time without homing (with paramenter 5 of sinapos) and obtain 0 as position?

many thanks in advance