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ewon plug is an industrial data bus that has developed rapidly in recent years. It mainly addresses digital communication between field devices such as intelligent instruments, controllers, and actuators on the industrial site, as well as information transfer between these field control devices and advanced control systems. Due to a series of prominent advantages such as simplicity, reliability, and cost-effectiveness, fieldbus has received significant attention from many standards organizations and computer manufacturers. It is an industrial data bus and serves as the underlying data communication network in the automation field. The emergence of fieldbus plays a very important role in industrial development and has a significant impact on national economic growth. Fieldbus is mainly applied in fields such as petroleum, chemical industry, electric power, pharmaceuticals, metallurgy, processing and manufacturing, transportation, national defense, aerospace, agriculture, and buildings.

ewon plug introduction

Every microprocessor must be connected to a certain number of components and peripheral devices. However, if each component and every type of peripheral device were directly connected to the CPU using separate sets of wires, the wiring would become intricate and complex, making implementation difficult. To simplify hardware circuit design and system architecture, a common set of lines, equipped with appropriate interface circuits, is used to connect various components and peripheral devices. This shared connection pathway is known as a bus. Adopting a bus structure facilitates the expansion of components and devices, especially when unified bus standards are established, enabling interoperability between different devices. In microcomputers, buses are generally categorized into internal buses, system buses, and external buses. The internal bus connects peripheral chips within the microcomputer to the processor for chip-level interconnection. The system bus connects plug-in boards to the system board in the microcomputer for board-level interconnection. The external bus serves as the communication link between the microcomputer and external devices, allowing information and data exchange at the device level. Additionally, from a broader perspective, computer communication methods can be divided into parallel communication and serial communication, with corresponding communication buses referred to as parallel buses and serial buses. Parallel communication offers high speed and good real-time performance but requires many signal lines, making it unsuitable for compact products. Serial communication, although slower, is simpler, more convenient, and flexible for microprocessor circuits where data throughput is not excessively large. Serial communication is typically classified into asynchronous and synchronous modes. With advancements in microelectronics and computer technology, bus technology continues to evolve and improve, resulting in a wide variety of bus types, each with its own unique characteristics.

ewon plug types

Common data buses include ISA, EISA, VESA, PCI, etc. "Address bus AB" is specifically used to transmit addresses. Since addresses can only be transmitted from the CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state, which differs from the data bus. The bit width of the address bus determines the size of the memory space that the CPU can directly address. For example, if the address bus of an 8-bit microcomputer is 16 bits, its maximum addressable space is 2^16=64KB. The address bus of a 16-bit microcomputer (x-bit processor refers to the number of bits (1, 0) that the microprocessor can process in one clock cycle, i.e., the word size) is 20 bits, and its addressable space is 2^20=1MB. Generally, if the address bus is n bits, the addressable space is 2^n bytes. "Control bus CB" is used to transmit control signals and timing signals. Among control signals, some are sent by the microprocessor to memory and I/O interface circuits, such as read/write signals, chip select signals, and interrupt response signals; others are fed back to the CPU by other components, such as interrupt request signals, reset signals, bus request signals, and device ready signals. Therefore, the transmission direction of the control bus is determined by the specific control signal, and (information) is generally bidirectional. The bit width of the control bus depends on the actual control needs of the system. In practice, the specific situation of the control bus mainly depends on the CPU. According to the method of data transmission, buses can be divided into serial buses and parallel buses. In serial buses, binary data is sent bit by bit to the destination device through a single data line; parallel buses typically have more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. Depending on whether the clock signal is independent, buses can be divided into synchronous and asynchronous buses. The clock signal of a synchronous bus is independent of the data, while the clock signal of an asynchronous bus is extracted from the data. SPI and I2C are synchronous serial buses, and RS232 uses an asynchronous serial bus.

ewon plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also possess fieldbus capabilities. In DCS, fieldbus is widely used. The following issues should be noted when using fieldbus: 1) Communication distance. Fieldbus communication distance generally has certain requirements. For example, PROFIBUS/DP at a rate of 12Mbps can reach 200m using standard cable. If using a rate of 187.5kbps, it can reach 1 000m. Communication distance has two meanings: first, the distance achievable between two nodes without repeaters; generally, distance is inversely proportional to communication rate; second, the distance between the two farthest nodes in the entire network. Manufacturers' descriptive materials are often unclear about this. In practical use, the scope of the entire network must be considered. Electromagnetic wave signals take time to propagate through cables. Especially in some high-speed fieldbuses, if the distance is increased, certain communication parameters must be modified; 2) Cable selection. The field environment determines the communication speed and medium of the fieldbus. Generally, fieldbus uses electrical signals to transmit data, and during transmission, it is inevitably affected by the surrounding electromagnetic environment. Most fieldbuses use shielded twisted pair cables. It must be noted that different types of fieldbuses may require different shielded twisted pair cables. Fieldbus developers generally specify a special type of cable, and the specified rate and transmission distance can only be achieved under correct use of this cable. Under extremely poor electromagnetic conditions, optical fiber is a reasonable choice; otherwise, local interference may affect the operation of the entire fieldbus network; 3) Isolation. Generally, fieldbus electrical signals are electrically isolated from the interior of the device. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices on the entire network segment. If not isolated, high voltage signals will continue to damage other circuits inside the device, leading to serious consequences; 4) Shielding. The outer layer of the shielded cable used by the fieldbus must be grounded at a single point. If high-frequency interference is severe, multi-point capacitive grounding can be used. Multi-point direct grounding is not allowed to avoid generating ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations on connectors, but improper handling can affect the communication of the entire system. For example, fieldbus generally adopts a bus-type daisy chain connection method. When connecting each device, attention must be paid to how to insert and remove equipment without affecting existing communication conditions, which places certain requirements on connectors; 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be adopted at both ends of each network segment of the bus. The first function is to absorb reflections, and the second is to achieve correct voltage levels at both ends of the bus to ensure communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the requirements in the control field for reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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