Twenty years back, machines were basic, and work in industries was, generally, manual in nature. Machines were intended to be physically controlled. Today, if individuals search for around them will discover numerous things have the control frameworks, which are important to compose the perplexing gadgets. The control framework is of essential significance for gadgets and machines in processing plants, airplane, vehicles, and even in some home gadgets. Today, it is hard for individuals to evade the utilization of control frameworks in the work place. Without mechanized control frameworks, industrial facilities face numerous issues, which would somehow or another be extremely elusive an answer for. Keeping this in mind, The study is an attempt to understand the concept of PLC and its different modes of communication viz-a-viz wired and wireless. Wired communication includes RS485 and Profinet mode, while in Wireless communication IWLAN is used. At present, wired communication is used by MANY MANUFACTURING INDUSTRIES. Wired communication is expensive and space consuming, so the industries should plan to divert themselves into wireless communication to meet the requirements of technological advancement as well as to embark into INDUSTRY 4.0.