Implementation of Modbus RTU and Modbus TCP communication using Siemens S7-1200 PLC for batch process

Abstract

Batch process is widely applied in pharmaceutical, paint, food and beverage industries etc. In Batch process specific amount of input feed is passing through desired set of equipment for a specified amount of time to get a definite amount of valuable output product. In batch process, temperature of batch reactor is very important parameter. This temperature loop is mostly controlled through PID controller, but for precise control and plant optimization of batch process are performed by some advanced control strategies like fuzzy, MPC (Model Predictive Control), neural etc. In industries these advanced control schemes implemented through DCS (Distributed Control System), PLCs (Programmable Logic Controller). For communication with dif- ferent make controllers user can use various communication protocol such as Modbus TCP, Modbus RTU, Ethernet, Profibus, Profinet etc. In this experiment Modbus RTU, Modbus TCP communication protocol are used for communication and control of batch process from remote controllers.