Programmable logic controllers (PLCs) are nowadays becoming more popular in industrial process control applications because of the most of their advantages. The rotary hearth furnace (RHF) is one such unit used in industrial process, which requires more advanced control for its operation. In this project attempt has been made to automize the control function of Rotary Hearth Furnace in BHEL using PLC. This project deals with the design of the ladder logic from the relay logic for the Rotary Hearth Furnace unit through PLC.
The conversion of Relay logic to PLC has imparted good flexibility, fast implementation of changes in control program, easier trouble shooting, high speed operations and more reliability.