Abstract: SCADA system is envisaged for the steel plants Electrical and Instrumentation automation network world wide now a day. SCADA system is Supervisory Control and Data Acquisition system, SCADA system is based on PLC system, The SCADA system uses PLC to collect the data from field instruments and equipments used in Industrial Process system. The SCADA system has been developed by companies who are members of Standardization committees e.g. OPC, OLE for the process control and include trends of IT technologies.