Assistant Professor, Bannari Amman Institute of Technology, Sathyamangalam
Junior Research Fellow, Bannari Amman Institute of Technology, Sathyamangalam.
The challenge of handling process parameters such as flow, level, temperature, and pressure, which is regarded as the most significant problem in the process industry environment. In a spherical tank, the cross section area of the tank varies nonlinearly as the height of the tank changes, so shape of the level changes in a nonlinear manner. The nonlinear system is used by most of the process industries for storage purposes, like cement, sugar, paper & pulp, oil, and gas. The maintaining and controlling the process parameter liquid level of the spherical tank is critical for system stability, and the controller is designed for simplicity and improved performance. In this research work the control algorithms in the enhanced PID controller were selected. The Enhanced PID employs a velocity form of algorithms, and the resources on which the loop operates a change in errors to change the output. They are in charge of the system's stability as well as the proportional, integral, and derivative control values are then determined using the PIDE auto- tuning method. This is very effective for adaptive gains as well as multi-loop and cascade control. Conventional PID control systems used in controllers have positional form and work directly on errors not suitable for large systems. So, the Logix5571 controller is used to control spherical tank that communicates IO’s remotely via Ethernet IP and Modbus master-slave connection.