Dears,

I am using an analog threshold trigger to switch on the output. When the temperature rises above the preset temperature, the output turns on. I have a problem because I want the output to no swich on, after the temperature drops and then rises again (see attached file). In other laguages it is easy for example in C,  I can use variable to do it (set variable =1 if temperature rises and set variable = 0 if temperature decreases). Which function do I need to use i FBD language?

hello rafpur,

do it like this:

Greetings Ella_68

Dear Ella_68

Thank you for your support. It really helped me to resolve this problem. I made only one improvement, by adding NOT function. See attached picture. Now it works! :) Greetings.