Web Reference: Jul 31, 2024 · Like a function, a function block contains subroutines that are always executed when a function block is called by another code block. A function block can also be called several times at different points in a program. Welcome to our latest video on PLC fundamentals! In this tutorial, we'll dive into the key differences between Function Calls (FC) and Function Blocks (FB) in PLC programming. Jun 21, 2022 · Function blocks are declared as instance of an object, so the internal memory is static, while the one of the functions is allocated in the stack. It means every time you call a function the local variable are reset, while a FB instance mantains the value reached at previous execution.
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