5SDF1045H0002 The Controller Local Area Network (CAN) was first developed by Bosch in 1985 to build in-car networks. Before that, car manufacturers used point-to-point wiring systems to connect in-car electronics. But with the increase in in-car electronics, this wiring system requires more and more connections, making the system cumbersome and expensive. As a result, manufacturers began to use in-car networks to replace point-to-point cabling systems to reduce cabling cost, complexity, and system weight. Under this background, CAN, as a highly integrated serial bus system for building intelligent device network, came into being and became the standard of in-car network. As a result, CAN quickly gained popularity in the automotive industry and became an international standard (ISO 11898) in 1993. After 1994, several high-level protocol standards for CAN were developed, such as CANopen and DeviceNet. These new protocols have also been widely accepted in other markets and are now part of the industrial communications standard.

CAN was originally born in the automotive field, so the most common application is the electronic network in the car. However, in the past two decades, more and more industries have recognized the reliability and advantages of CAN, and have applied the CAN bus to many other applications. For example, trams, subways, light rail and long-distance trains all use CAN networks. In each of these vehicles, a variety of CAN-built networks CAN be found, such as connecting door units, 5SDF1045H0002 brake controllers, passenger flow counting units, etc. Applications for CAN can also be found in aviation, such as flight condition sensors, navigation systems, and computers in the cockpit. In addition, CAN bus can also be seen in aerospace applications, such as flight data analysis and aircraft engine control systems (fuel systems, pumps, linear actuators, etc.).

Devicenet

Devicenet is an open, low-cost, high-performance communication Network based on CAN (Controller Area Network) technology developed in the mid-1990s, which meets global industry standards and was originally developed and applied by Rockwell Company in the United States.

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Many features of Devicenet are inherited from CAN, a well-designed communication bus, which is mainly used for real-time transmission of control data. The main features of DeviceNet are: short frame transmission, the maximum data of each frame is 8 bytes; Non-destructive bit-by-bit arbitration technology; The network can connect up to 64 nodes; The data transmission baud rate is 125kb/s, 250kb/s, 500kb/s. Point-to-point, multi-master or master/slave communication mode; Physical and data link layer protocols of CAN are adopted.

Six, HART bus

HART, High Speed Channel protocol for addressable remote sensors. In the 1980s, HART came into being because most meter users wanted a digital communication standard compatible with 4 to 20mA analog signals. This standard was introduced in 1986 by Emerson’s Rossmond.

HART protocol uses FSK frequency shift keying signal based on Bell202 standard to superposition 0.5mA audio digital signal on low frequency 4-20mA analog signal for two-way digital communication, and the data transmission rate is 1.2kbps. Since the average value of the FSK 5SDF1045H0002 signal is 0, the size of the analog signal transmitted to the control system is not affected, and the compatibility with the existing analog system is guaranteed. In HART communication, the main variables and control information are transmitted by 4-20mA, and additional measurement, process parameters, equipment configuration, calibration, and diagnostic information are accessed through HART if needed.

7. CClink

CC-Link is the control and 5SDF1045H0002 communication link system, which is jointly launched by a number of companies led by Mitsubishi, is an open fieldbus, its data capacity is large, the communication speed is multi-level optional, and it is a composite, open, adaptable network system, which can adapt to the different ranges of higher management network to lower sensor layer network.

Viii. WorldFIP

WorldFIP is one of the three components of the European standard EN50170 (Volume3), which is developed by adopting the IEC International Standard for Physical Layer (1158-2) on the basis of the French standard FIP-C46-601/C46-607. It consists of three communication layers. The distinctive feature of WorldFIP is that it provides a single fieldbus with a physical layer for all industrial and process control. The underlying control system, manufacturing system and drive system can be directly connected to the WorldFIP bus at the control level, without the need to mix RS485 and other low-speed buses to connect to the underlying equipment to achieve the same function.