Chapter 7 Pid Built-In Function Block; Figure 14: Pid In Ladder Diagram; Figure 15: Pid In Function Block Diagram - GE PACSystems RX7i Cpu Programmer's Reference Manual

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Chapter 7 PID Built-In Function Block

This chapter describes the PID (Proportional plus Integral plus Derivative) built-in function block,

which is used for closed-loop process control. The PID function compares feedback from a process

variable (PV) with a desired process set point (SP) and updates a control variable (CV) based on the

The PID function uses PID loop gains and other parameters stored in a 40-word reference array of

16-bit integer words to solve the PID algorithm at the desired time interval.

This chapter presents the following topics:

Operands of the PID Function

Reference Array for the PID Function

Operation of the PID Function

PID Algorithm Selection (PIDISA or PIDIND) and Gain Calculations

Determining the Process Characteristics

Setting Tuning Loop Gains

February 2018

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