Hi 

I found the solution below, but would like to make it so
user only have to change one temperature, 
(e.g on TD text display). 
Hysteresis must be fixed on e.g. 1 degree. 
is there anyone who has made so setpoint off or ON is calculated

https://support.industry.siemens.com/tf/us/en/posts/variable-temperature-threshold/124201/?page=0&pageSize=10

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 How do you get to change the "delta" parameter ? for me I dont see this as an option on the analog threshold tigger function block.

Thank you Maxi 

ixo65

Use the analog treshold trigger. Set the delta parameter to -10 (1,0 °C). Then must you change only the ON parameter.