Hi, I’m used to ladder logic that has EN/ENO so i’m having difficulties writing a function that looks at the temperature and a user input then generates a set point according to the two variables. The function needs to work as follows: If the temperature is less than 25°C and the user wants to cure to X(1-9)% moisture content then the humidity set point is Y% If the temperature is between 25°C and 27°C and the user wants to cure to X(1-9)% moisture content then the humidity set point is Y% etc. So i have 9 MUX functions and i only want 1 to work if the temperature is within range but it wont allow me to use a direct contact to stop the MUX functions that are out of range. I could use another MUX If i could move a number into a variable: Move 1 into Calc if temp is <25 and Move 2 into Calc if temp is >25<=27 etc
Hello John, you could use a SEL FB to conditionally freeze the output value to a specific variable and otherwise use the output of your MUX FB.
Or in this case decide which MUX to use…
Is this MUX output var a local variable or a global output variable? (Humidity_SP)
I do recommend not to write to the same output on multiple places.
Better to use two unique variables and have a defined behavior.Humidity_SP := SEL(Humidity_SP_1;Humidity_SP_2; someCondition)
