OPC protocol golang implementation

With the continuous development of industrial automation, the OPC protocol has increasingly become the mainstream protocol for data communication in the industrial field. As a high-performance and reliable programming language, Golang has attracted more and more attention in the field of industrial automation. This article will introduce how to use Golang language to implement data communication of OPC protocol to help readers better understand the OPC protocol and be able to apply Golang language in practical applications.

1. Introduction to OPC protocol

OPC protocol is the abbreviation of OLE for Process Control (OLE is the compound document technology development framework proposed by Microsoft, and Process Control is process control). Protocol for data communication in the field of industrial automation. The OPC protocol was developed by Microsoft to enable various industrial control devices to communicate with each other on the same platform to achieve device interoperability and data sharing.

The OPC protocol divides device data into two types: Tag and Item. Tag refers to a certain function in the device, such as temperature, voltage, etc.; item refers to the combination of tag name and data type. The OPC protocol also defines various data types and formats, such as Boolean, Byte, Int32, Float, etc. The differences in these data types represent different data formats.

2. OPC protocol implementation method

In the OPC protocol, there are two implementation methods: OPC Client and OPC Server. OPC Client refers to the party that actively requests data from the OPC Server in data communication, and OPC Server refers to the party that passively responds to OPC Client requests and provides data during data communication.

When using Golang language to implement the OPC protocol, we need to first understand the communication method between OPC Client and OPC Server. Usually, OPC Client communicates with OPC Server through DCOM (Distributed Component Object Model) protocol. In the Golang language, we can simulate the communication method of the DCOM protocol by using the DCE/RPC protocol and Wine.

DCE/RPC protocol is an RPC (remote procedure call) protocol based on TCP/IP protocol, which is relatively simple to implement. Wine is an open source software that can run Windows programs. We can run the OPC Server program in Wine to achieve communication between the OPC Client and the OPC Server.

3. Golang implementation of OPC protocol

The following are the specific steps to implement the OPC protocol using Golang language:

1. Install Wine and OPC Server

We need to download and install Wine first, as well as an OPC Server that can run in the Wine environment. When installing the OPC Server, we need to set the user name and password of the OPC Server for authentication in subsequent procedures.

2. Implementing the DCE/RPC protocol

We can use Golang’s Net/RPC package to implement the DCE/RPC protocol. During the implementation process, we need to first generate an IDL file (Interface Definition Language), and then use the rpcgen tool to generate the corresponding RPC code file. Then, we can use Golang's RPC package to import the generated code file to communicate with the DCE/RPC protocol.

3. Implementing OPC Client

When implementing OPC Client, we need to define a structure to store the OPC Server connection information and query information, and then use Golang’s RPC package Call the method provided by the OPC Server to achieve data communication with the OPC Server.

4. Implementing OPC Server

When implementing OPC Server, we need to first define the interface of OPC Server and define the corresponding methods in the interface (such as reading, writing data, etc.). Next, we use Golang's Net/RPC package to register the interface into the RPC service to respond to the OPC Client.

4. Summary

By implementing the OPC protocol in the Golang language, we can better understand the working principle of the OPC protocol, and at the same time, we can also use the efficient and reliable Golang language to carry out tasks in the field of industrial automation. Programming development. Of course, in practical applications, we still need to further understand and master the various specific implementations and application scenarios of the OPC protocol to better play its role.

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