What is OPC specification?

The OPC DA specification defines the exchange of data including values, time and quality information. OPC Alarms & Events (OPC AE) The OPC A&E specification defines the exchange of alarm and event type message information, as well as variable states and state management.

What protocol does OPC DA use?

The binary protocol is opc. tcp://Server and http://Server is for Web Service (SOAP). Otherwise, OPC UA works completely transparent to the API caller. OPC UA servers exist for Linux, Mac, and Windows and can be developed for any OS with basic TCP functions available.

What is difference between OPC UA and DA?

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).

How does OPC DA work?

OPC is a client/server technology. One application acts as the server providing data, and the other acts as a client using data. OPC is a widely accepted industrial communication standard that enables the exchange of data between multi-vendor devices and control applications without any proprietary restrictions.

What is OPC XML DA?

The OPC XML-DA (Data Access) specification builds on the OPC Data Access specifications to communicate data in XML. It incorporates SOAP and Web services. The current version of the OPC XML-DA specification is 1.01.

What port does OPC DA use?

port 135
When an OPC client connects to an OPC server, it connects to port 135 (the RPC port mapper), which assigns one TCP port and one UDP port to the component.

What is the difference between OPC and Modbus?

Modbus devices are generally RS485, and OPC UA devices are Ethernet, so there has to be some hardware conversion: new processor, gateway, daughter card, etc. I’ll leave that for another time. The more significant question is how to represent the registers and coils of the Modbus device in OPC UA.

Is OPC TCP or UDP?

One is a binary TCP protocol, optimized for high performance and the second is Web service-oriented. The OPC information model is a Mesh Network based on nodes.

Is Modbus an OPC?

The Modbus OPC Server provides an intuitive user interface to configure reliable Modbus connections and OPC tags. Then, OPC DA clients, such as Historians, HMI, and SCADA, can easily connect to the OPC Server and exchange real-time data with multiple devices.

What is OPC server in SCADA?

Open Platform Communications (OPC) is a series of standards and specifications for industrial telecommunication. OPC specifies the communication of the real-time plant data between control devices for different developers of SCADA software.

What is the difference between OPC DA and OPC HDA?

OPC Historical Data Access, also known as OPC HDA, is used to exchange archived process data. This is in contrast to the OPC Data Access (OPC DA) specification that deals with real-time data. OPC technology is based on the server / client architecture.