Have you ever seen an Integral Term on a PID controller that seems an order of magnitude larger or smaller than what should be used? Often, the issue stems from the method in which logic is executed on the Process Automation Controller (PAC).
Professionals who tune PID controllers using manual methods tend to agree that understanding the Process Gain of their system is of the up-most importance. Among industry practitioners the Process Gain is often referred to as the “how far” or even the “sensitivity” variable and yet these descriptions can be rather vague to beginners.
Walking out of a classroom with the impression that you didn’t learn as much as you should have is never a good feeling. After an experience like that it can sometimes be hard to put your finger on what exactly went wrong:
In a recent blog post we paid tribute to Dick Morley and his pivotal contribution to the process automation industry: the Programmable Logic Controller (PLC). Since the PLC and Distributed Control System (DCS) are both instrumental in controlling complex production processes, people occasionally use the two terms interchangeably. While the two are related, their applications are notably different.