Ethernet communication for its large amount of data transmission speed, openness is good, low cost, to make up for low defect rate of fieldbus communication, information network this stage to become the most widely used LAN technology. Ethernet directly into the industrial control field, there are still some problems, Ethernet media access method CSDA / CD can not guarantee deterministic and real-time network transmission, can not meet the requirements of the industrial field harsh environments. Ethernet industrial control field is introduced, through division of labor and field bus (CAN BUS), the two isomers constituting the network structure, efficient and low-speed Ethernet fieldbus combined to solve large-scale real-time monitoring and control system and reliability issues and improve the efficiency of the entire system. Interconnection of the two isomers of the network, the need to achieve an industrial gateway.
CAN (Controller Area Network) is a controller area network, CAN bus specification has been the development of international standards for the International Organization for Standardization ISO11898, and is supported by many semiconductor device manufacturers, the introduction of a variety of products with integrated CAN protocol. CAN bus serial communication network belongs, because of its use of many new technologies and unique design, low cost, high reliability, real-time, flexibility, and strong anti-interference characteristics, it has been widely used in automatic control system in. In the field of automotive electronics, automatic control, power systems, CAN bus has the incomparable superiority.
CAN bus has the following advantages
· Data communication and real time between the nodes of the network devices CAN bus
· CAN bus development cycle time is short
· Prospects for the development of abnormal CAN bus vast
The main task of CAN / Ethernet gateway is designed protocol conversion, data analysis requires accurate and complete, and rapid response, time-consuming low, timeliness and safety. Based on the ARM RISC architecture microprocessor instructions of high efficiency, easy to build software platform, along with a wealth of peripheral expansion circuit, to meet the requirements of real-time multitasking. Configured using Ethernet technology and ARM CAN Bus protocol conversion gateway is a highly viable solution.
With the improvement of performance of industrial control systems, industrial Ethernet applications will be more extensive. Although the CAN bus powerful cost-effective, but it can not be replaced once the country has led to traditional industrial RS232 bus, then, without changing the traditional pattern of industrial bus, is calculated by Bai Ma BMG700 edge gateway, equipped with CAN bus interface, can convert data between cAN bus and other traditional bus, BMG700 support MQTT, JSON, HTTP and other protocols to the north, support OPC, Modbus, TCP, UDP, etc. the south part of the brand PLC protocols, extensive access, intelligent matching, powerful computing , 5G / 4G wireless communications, industrial things gateway box.