OPC (OLE for process control) server is a standardized interface for industrial device servers. An OPC server provides devices, such as an I/O device, to communicate with a range of HMI/SCADA software packages residing on the host. Any software system with OPC client capabilities can access these OPC drivers. The OPC server drivers also consist of the following OLE components: I/O driver that maintains the drive’s channel, device and datablock objects as well as performs all required functions for communicating with the process hardware and exposes the methods and properties to other applications and a power tool that accesses the I/O server and lets users view and modify channel, device and datablock properties.