OPC :- OPC is a software interface standard that allows windows program to communicate with industrial hardware devices. Opc is implemented in server client pair. The opc server is a software program that converts the hardware communication protocol used by a plc plc connect to the into the opc protocol. The opc client software is any program that needs to hardware, such as an hmi . The opc client uses the opc server to get data from or send commands to the hardware.
OPC client server: - OPC server is software that converts the hardware communication protocol used by plc into the opc protocol (device connectors). Opc client software is any software that needs to interact with hardware, such as hmi . An opc client uses an opc server to receive data or send commands from the device.the value of opc is that it is an open standard, which means lower costs for manufacturers and more options for users. Hardware manufacturers need only provide a single opc server for their devices to communicate with any opc client. Software vendors simply include opc client capabilities in their products and they become instantly compatible with thousands of hardware devices. Users can choose any opc client software they need, resting assured that it will communicate seamlessly with their opc-enabled hardware, and vice-versa
The typical opc connection scenario is a single server-client connection on a single computer as illustrated above, but there are more possibilities. For example, you might need to:
OPC Aggregation :- connect an opc client to several opc servers. This is called opc aggregation.
OPC tunnelling :- connect an opc client to an opc server over a network. This can be done with opc tunnelling.
OPC bridging :- connect an opc server to another opc server to share data. This is known as opc bridging.
Following opc specifications are used in industries:
OPC-da (data access): provides access to real-time data. Like values of temperature, pressure, density, acceleration, and other types of process control data from opc-da server.
OPC-AE (alarms & events): opc ae servers are used to accept and exchange process alarm and event.
OPC HDA (historical data access): this is used to retrieve historical process data for analysis. This data is typically stored in files, databases or remote telemetry systems.
OPC UA (unified architecture): opc ua is a more advanced and modern version of opc that provides not only data access but also broader functionality, including support for information modeling, security, and communication across different platforms
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