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Could Someone explain me the PID code in this formula node...why the have considered 0-255 as run value for taking P I D control action using if loop?

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Hello,

I need to understand the Code for PID algorithm in formula node. (these codes are developed by the Laboratory process setup manufacturers) 

here they have used just an if loop to check the PV to reach the Setpoint by taking P I D control action. I could understand why they have set the value to -set when less than 0 and 255 when greater than 0. kindly someone explain me the code.

Thanks in advance. 

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