Network management integration with SCADA and HMI using OPC and Web Services Implemented: OPC DA 3.0, 2.05,1.0, OPC XML DA, OPC Alarms and Events Version 1.1 and 1.0, SNMPv2c, SNMPv1, JScript pre-processing, using ping to manage devices without running SNMP agent and displaying of round trip time as one OPC variable, max.10 devices