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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
Last edit: Spring 2020-05-20
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
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
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
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
Last edit: Spring 2020-05-20
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
Thanks. :)