Hi. I just start learning about PLCs and Codesys , so have some simple questions.

What happens if you use a physical input (fx. a switch from the control box on plc) as input variable to a button ? (Is it the physical or virtual input that takes priority ?)

How could a physical and a virtual (visualisation) input be made to control the same
output ?
Thanks

Hi,
With a button in the visualization you can't force a physical input.
So it will works in simulation mode, but in real situation physical input will takes priority !
If you want to control an output (or whatever variable) with a physical input and with a button, you have to use 2 variables.

For example, a very simple one !! :
VAR
MyButton:BOOL; ( to use with the button in a visualization page)
MyInput AT %IX0.0:BOOL; (Physical input)
MyOutput AT %QX1.1:BOOL; (Physical output)
END_VAR

(Program in ST langage)
MyOutput:= MyButton OR MyInput;
//By this way you can control the output with both button and physical input

BR