What is OPC UA PLC?
OPC Unified Architecture (OPC UA) is a machine to machine communication protocol for industrial automation developed by the OPC Foundation. Distinguishing characteristics are: Based on a client server communication. Focus on communicating with industrial equipment and systems for data collection and control.
What is a OPC UA object?
OPC UA defines 8 Node Class types in the address space Object, Variable, Method, ObjectType, VariableType, ReferenceType, DataType, View. Only the nodes under the Objects node are considered for the COM UA Proxy address space and others such as Types, Views are not mapped.
What is the difference between OPC and OPC UA?
OPC DA allows to access only the current data and is incapable to generate alarms, historical events whereas OPC UA supports features like historical events, multiple hierarchies and provides methods and programs (that are called commands).
What is OPC UA connector?
PI Connector for OPC UA is designed specifically to transmit data between OPC UA Servers and the PI System. OPC UA is a standard established by the OPC Foundation task force to allow applications to access process data from the plant floor in a consistent manner.
Why is OPC UA important?
OPC UA is a standard that ensures the open connectivity, interoperability, security, and reliability of industrial automation devices and systems. OPC UA is widely recognized as the key communication and data modeling technology for the Industry 4.0 initiative.
What are the advantages of OPC UA?
OPC UA is the main successor to classic OPC and one of its main advantages is that it is platform independent so it can be easily incorporated with Windows, Linux, Mac, Android and other platforms, which is significant for the manufacturing industry where machines and systems are often running on different platforms.
What can OPC UA do?
OPC UA provides access to a wide variety of data in both vertical and horizontal directions. The spectrum ranges from OPC UA components directly integrated on the devices and controllers or machines and systems to so-called gateways and aggregating servers.
What is OPC UA method?
An OPC UA method (setSpeed) is used to pass the speed of the engine, so that the stated value can be written to the data point element. The method will be called using the WinCC OA OPC UA client.
Does OSI PI support OPC UA?
PI Connector for OPC UA copies contextual and time-series data from OPC UA (OLE for Process Control Unified Architecture) servers to OSIsoft PI Data Archive and Asset servers. This version of the connector supports the Data Access (DA) and the Historical Access (HA) parts of the OPC UA specification.
