The security in industrial networks is most important because of critical information and data are transmitted over industrial networks. Industrial communication networks are increasingly based on open protocols and platforms that are also used in the IT industry and Internet environment. Most of the industries use wireless networks for communicating information and data due to high cable cost. As the wireless networks are insecure, it is essential to secure the critical information and data during transmission. This paper analysis the various security issues and security attacks related to industrial control system.