Oven temperature control using siemens S7-1200 PLC

Abstract

This report presents a comprehensive study on the design and implementation of a temperature control system for an oven using the Siemens S7-1200 Programmable Logic Controller (PLC) and a Human Machine Interface (HMI). It focuses on the PLC's programming environment, hardware configuration, and integration with the oven's sensors and actuators. The Hardware setup comprises the S7-1200 PLC, HMI, RTD sensor, measurement and control interfacing circuits, and heaters, which collectively enable data acquisition, signal processing, and actuation within the system. After acquiring oven data, identification of the system was performed using two different approaches, which are the Smith and Nishikawa methods. The PID control methodology employed in this study as extensive experiments and evaluations are conducted to analyze the performance of the developed control system. The system's response to various setpoint changes, disturbances, and load variations is tested experimentally to assess its stability, robustness, and accuracy in temperature regulation. The results obtained demonstrate the effectiveness of the proposed control system in maintaining the desired oven temperature within a tight range, even in the presence of external disturbances. The findings and insights obtained from this research provide valuable guidelines for designing and implementing control systems in similar industrial ovens (such as in: Pharmaceutical industry, Oil and Gas, Dairy industry … etc.).