# What is Proportional Integral Derivative Control (PID)?

**URL:** <https://forumautomation.com/t/what-is-proportional-integral-derivative-control-pid/1727>\
**Category:** Instrumentation\
**Created:** [February 4, 2017, 5:28pm UTC](https://forumautomation.com/t/what-is-proportional-integral-derivative-control-pid/1727 "2017-02-04T17:28:40Z")\
**Posts on this page:** 1\
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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [February 4, 2017, 5:28pm UTC](https://forumautomation.com/t/what-is-proportional-integral-derivative-control-pid/1727/1 "2017-02-04T17:28:41Z")

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**PID - Proportional Integral Derivative** Controller

The PID function uses system feedback to continuously control a dynamic process.

The purpose of PID control is to keep a process running as close as possible to a desired set point.

 ![](https://cdn.forumautomation.com/original/1X/d1b38777f846d779372537be05137af1abccc9b0.jpg) 

PID Means - Proportional + Integral + Derivative Control

CV = CV (P) + CV (I) + CV (D)

**Proportional Control**

Proportional Band - A band around SP is defined in percents of PV range.

Proportional error is 100% on the border of PB.

Proportional error is 0% at SP.

P-Control output CV(P) value that is in - Direct linear proportion to the size of error value.

 ![](https://cdn.forumautomation.com/original/1X/e2c175cf69edc7e88cf1e334d0d36f9732fc5068.jpg)

Advantages of Proportional Control- Simple Easy to implement

Disadvantages of Proportional Control- Never reach setpoint.

**Integral Control**

Compensate for the proportional control shortcomings.

The integral time set is the ideal amount of time for the process value to reach setpoint.

**Derivative Action**

Derivative Action responds to the rate and direction of change in the error.