Experimental validation of PID based cascade control system through SCADA-PLC-OPC interface

The paper presents the proportional, integral and derivative (PID) digital controller based cascade control system and its experimental validation through three different testing scenarios namely, control action through Supervisory Control and Data Acquisition (SCADA), control action using Programmable Logic Controller (PLC) and interfacing of PLC with NI-OPC server. In this study, Micrologix-1200 PLC and RSVIEW-32 SCADA have been used with RSLinx communication Software. The PLC-SCADA control loop has been implemented with the functionalities such as, real time data analysis, set point modifications, automatic report generation and integration of data with MS-Excel and MS-Access. The enhancement in project data analysis is effectively done through the integration of PLC with Labview. The obtained result proved that the conventional control system can be enhanced further more with PLC as well as NI-OPC server significantly.