O'Reilly logo

Tuning and Control Loop Performance, Fourth Edition, 4th Edition by Gregory K. McMillan

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

APPENDIX B

BASICS OF PID CONTROLLERS

Each of the three Proportional-integral-derivative (PID) controller modes have distinct advantages and disadvantages. Here is a review of the basic functionality of each mode.

Figure B.1 shows the contribution of each mode to the output for a setpoint change. In this example, the proportional mode and the derivative mode are acting on the error (the difference between the setpoint and the process variable [PV]) rather than just on the PV. In the time period shown, there is no update from the process measurement so we can see more clearly the function of each mode without any feedback from the process.

PROPORTIONAL MODE BASICS

The proportional mode provides an immediate reaction to a change in the PV. If the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required