Jul 31, 2024 · Function blocks are code blocks that store their input, output and in-out parameters permanently in instance data blocks, so that they remain available even after the block has been executed. Therefore, they are also referred to as blocks “with memory”.

Aug 6, 2007 · One other advantage of FB over FC (from STEP7 programming perspective) is passing the parameters in/out to the function. In FC the calling block push the variable into OBstack (limited in size) where with FBs, variable are passedusing instance DB.

Dec 31, 2020 · For me the main distinction between functions and function blocks is that function blocks can maintain state between two calls. For that reason, different calls in code require different instances of the function block.

Aug 2, 2022 · The main difference is the memory. Every time you call a function block, it creates a DB. This is very useful if you reuse the same function block for different motors or valves with the same set of parameters.

Jan 10, 2004 · My understanding is that a function can only have one output value, a function Block can have several. In some PLC's functions can be strung together and FB's can't.

Oct 17, 2022 · There are some key differences between a Function Block and a Function. The video below explains the differences: If playback doesn't begin shortly, try restarting your device. Videos you watch may be added to the TV's watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer.

A Function Block (FB) is an instance that has its own set of data. An FB maintains its own, internal machine state and often has an output to indicate when the work is done. An FB is asynchronous.

Function (FC) and Function Block (FB) both are used to optimize user programming. The main use of FC and FB is to divide and organize the user program into smaller parts that can be easily understood.

The main difference between an FB and an FC when programming a PLC is that with an FB you have the ability to store the values of your parameters in an associated data block. Whereas in the FC you don’t need a memory block.

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 …