Experimental Validation of PID Based Override Control System
Aicha Bensenouci, Wahid Nouibat
Journal of Electronic Systems, Vol. 5, No. 1, 2015.
DOI: 
Link: 
Abstract:
This paper presents the experimental validation procedure of a simple override control system through a typical use case of oil pipeline with pressure and flow control using a single valve. It is based on Siemens S7-300 PLC and
WinCC .The main aim of the control is to achieve a certain flow rate, however due to safety considerations, the pressure must
be kept within certain limits. The pressure controller is therefore known as the â€œlimiting controllerâ€ or â€œsecondary controllerâ€