The PID instruction is used to control the pressure of a vessel using a pressure transmitter as the process variable and a flow valve as the control variable. The setpoint is maintained at 50 psi.

Some of the topics contained in this book include:
-The PID Control Algorithm and how it works.
-Programming & Setup of the RSLogix 500 PID instruction.
-Understanding the Control Block Addressing.
-Proper selection of the Operational Time Mode.
-Setting an appropriate Loop Update Time interval.
-Scaling for Process & Control Variables.
-Important PID Terminology & Definitions.
-The Ziegler-Nichols Method of Tuning.