PLC-based advanced PID controllers

Abstract

[ES] Se diseñará un control PID avanzado con diferentes lenguajes de programación en TIA-Portal sobre un PLC Siemens S7-1214C. El control PID se aplicará sobre el modelo de un tanque calefactor simulado con LabVIEW, utilizando una tarjeta de National Instruments como interfaz.

[EN] Automatization is very important in the modern industry and there is a high request for PID controllers to control continuous processes, since PLC’s are present all over the world it is very useful to know how to implement a PID controller into a PLC. The purpose of this paper is learning how to tune and program a PLC based advanced PID controller for a continuous process (also applicable to other PID systems), at the hand of this you’ll be able to tune your own PID controller by the Ziegler–Nichols method. You will get in general, a more in depth view of how the PID controller works. Learn the purpose of each parameter of the PID and therefore how you can finetune it as you please, this is achieved by watching how the process reacts to the standard PID parameters but also some more advanced PID parameters like beta, alpha and gamma. We’ll also show the importance of implementing an anti-windup technique into a PID controller. You can learn how to program a discrete approximation of a PID controller by reading and studying our paper. We will also show the effect of an output filter that will reduce the noise caused by the derivative action, all of this either theoretical and practical. Everything will be executed on the Siemens S7-1200 PLC and simulated trough LabVIEW so you can learn how to execute it and get an idea of the results you should expect.