Reliance OPC UA Server

OPC Unified Architecture (OPC UA) is a communication protocol for industrial automation developed by the OPC Foundation. Recently, this standard has become increasingly widespread. It is much more advanced compared to its predecessor, OPC. Suppliers of OPC servers are gradually leaving traditional OPC for OPC UA.

Note

Beginning with version 4.8.0, a new OPC server – Reliance OPC UA Server – is part of the Reliance SCADA system.

From the point of view of the Reliance SCADA system, OPC UA has the following advantages:

Platform independence (OPC, which is based on data exchange through COM, is dependent on Windows); an OPC UA server can be a direct part of a PLC (in such a case, there is no need to have any communication driver or OPC server installed on the computer)
Data exchange between multiple computers is easy to configure (DCOM, which is used in OPC, does no longer need to be configured); for communication, common data-exchange standards are used: TCP/IP, HTTP(S), and SOAP
Data encryption

Key features of the server

Communication with Reliance's data servers (Reliance 4 Server and Control Server) through Web services
Only provides selected tags from a visualization project
Includes a monitoring tool for managing the OPC server