OPC UA conversion apparatus of Modbus communication protocol, and method

Abstract

The invention discloses an OPC UA conversion apparatus of a Modbus communication protocol. The apparatus comprises an OPC UA address space management module, an address space browsing module, a data read-write module, a data subscription module, an OPC UA communication module, a parameter configuration module, a Modbus serial port communication processing module and a Modbus / TCP communication processing module. The invention also discloses an OPC UA data conversion method of a Modbus communication protocol. A Modbus communication protocol is converted into an OPC UA protocol, multiple Modbus devices based on serial communication or TCP communication are packaged to form an OPC UA server, and an OPC UA client program conforming to the OPC UA protocol performs reading, writing and subscribing operation on data of these Modbus devices according to an OPC UA standard. A new technical standard OPC UA technology is introduced to the devices using the Modbus communication protocol, the Modbus devices are enabled to acquire and modify the data of the Modbus devices directly according to the OPC UA standard, and the devices using the Modbus communication protocol can operate normally in the new standard without changing software and hardware.

Description

technical field [0001] The invention relates to the field of computer automatic control, in particular to an OPC UA conversion device and method of the Modbus communication protocol. Background technique [0002] With the further development of computer technology, computers are playing an increasingly important role in the field of automatic control. Various instruments, meters and single-chip microcomputer systems in industrial control provide communication protocols with computers, thus providing a basis for the design of computer control systems. Provides great convenience. But before the emergence of OPC technology, the intelligent instrument equipment, distributed I / O modules, PLC and other equipment used in the computer measurement and control system came from different manufacturers, and each manufacturer, for their own commercial interests, Failure to follow a unified interface specification has resulted in extremely complex communication between devices, and it is ...

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Problems solved by technology

[0002] With the further development of computer technology, computers are playing an increasingly important role in the field of automatic control. Various instruments, meters and single-chip microcomputer systems in industrial control provide communication protocols with computers, thus providing a basis for the design of computer control systems. Provides great convenience. But before the emergence of OPC technology, the intelligent instrument equipment, distributed I / O modules, PLC and other equipment used in the computer measurement and control system came from different manufacturers, and each manufacturer, for their own commercial interests, Failure to follow a unified interface specification has resulted in extremely complex communication between devices, and it is difficult to realize information interaction between field devices and upper-layer control software and direct interconnection and interoperability between field devices, thus limiting the openness of the computer measurement and control system. Improved versatility

A large number of field devices are used in the field of industrial control, and there are inconsistencies between the upper-layer software and the lower-layer hardware. Different drivers must be developed for different devices, which results in product compatibility between hardware manufacturers and software developers. In addition, the selection of hardware equipment and software by users is greatly restricted, and can only be limited to dedicated hardware equipment manufacturers and software manufacturers. In order to meet the needs of actual work, hardware manufacturers and software developers urgently need a A plug-and-play device driver with high efficiency, reliability, openness and interoperability. Under the requirements of this form, the emergence of the OPC standard of the OPC Foundation solves the above problems, but the traditional OPC technology has Many shortcomings, such as platform dependence on Microsoft, poor security, single data information, etc., has launched a new generation of OPC standard OPC UA (OPC Unified Architecture)

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