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I would like to create a function block that can use multiple data types and constants. For example I would like to be able to pass in int, dint, uint, udint data types.
I can do this using the 'any' data type in my Var_input of the function block. The only problem is that it will not let me pass in a constant to the function block (see attachment).
There must be a way to do multi data_type/constant parameters. The Move function block accepts multiple datatypes and constants. How does the Move do this?
Constants are part of your compiled code, while variables are memory address. I think this is why you can't use any for constants.
Move is a value change operation, meaning it expects a value at the in parameter, and a memory address at the out one.
Btw, I have no clue how it handles the input declaration.
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I would like to create a function block that can use multiple data types and constants. For example I would like to be able to pass in int, dint, uint, udint data types.
I can do this using the 'any' data type in my Var_input of the function block. The only problem is that it will not let me pass in a constant to the function block (see attachment).
There must be a way to do multi data_type/constant parameters. The Move function block accepts multiple datatypes and constants. How does the Move do this?
Any Data_type.pdf [44.68 KiB]
Constants are part of your compiled code, while variables are memory address. I think this is why you can't use any for constants.
Move is a value change operation, meaning it expects a value at the in parameter, and a memory address at the out one.
Btw, I have no clue how it handles the input declaration.
I found a work around that should work for my application.
If I have the input parameter as a LReal CODESYS will automatically type cast from any number or constant to LReal without loss of data.
I define my destination parameter as type 'Any', and cast the result into the destination data type.
This seems to work with the testing that I have done at this time.
An example of this running with multiple data types is attached.
TestFunction.pdf [14.95 KiB]