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Best 4 instrumentation and control engineers. Friday, September 4, 2009. Stands for proportional control, I. For integral control and D. This is also what is called a three term controller. While the basic algorithm has been unchanged for many years and is used in all distributed control systems, the actual digital implementation of the algorithm has changed and differs from one system to another. How a PID Controller Works. The PID controllers job is to maintain the output at a l.