In siemens S7-300 PLC, what is function and function
block ? What is the difference between them ? When to use
function and when to use function block ?
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Answer Posted / Mohd. Vikaar
Function: A user-defined instruction that performs a specific operation. Function Block: A pre-programmed combination of instructions (functions) that perform a specific task. The difference lies in the complexity: Functions are usually simple operations, while Function Blocks are more complex and can have multiple inputs and outputs. When to use: Use functions for simple operations, and function blocks for complex tasks or reusable functions.
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