German WETRON automation plug, WETRON automation model, WETRON automation price

WETRON automation 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 in industrial settings, as well as information transfer between these field control devices and advanced control systems. Due to the prominent advantages of fieldbus, such as simplicity, reliability, and cost-effectiveness, it 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 field of automation. 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.

WETRON automation plug introduction

Any 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 single set of lines, equipped with appropriate interface circuits, is commonly used to connect various components and peripheral devices. This shared set of connection lines is called 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 generally include 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 connects the microcomputer to external devices, allowing information and data exchange between the microcomputer as a device and other equipment; it is used for device-level interconnection. Additionally, from a broader perspective, computer communication methods can be divided into parallel communication and serial communication, with the 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 more flexible in microprocessor circuits where data throughput is not very high. Serial communication is generally categorized into asynchronous mode and synchronous mode. With the development of microelectronics and computer technology, bus technology continues to evolve and improve, resulting in a wide variety of computer bus technologies, each with its own characteristics.

WETRON automation plug advantages

1) The dual-bus structure oriented toward memory offers higher information transfer efficiency, which is its main advantage. However, conflicts still occur when both the CPU and the I/O interface need to access memory. 2) The CPU connects to high-speed local memory and local I/O interfaces via a high-transmission-rate local bus, while slower global memory and global I/O interfaces connect to a slower global bus. This balances high-speed and slow-speed devices, preventing them from interfering with each other. 3) Simplifies hardware design. It facilitates modular structural design methods. Microcomputer designs oriented toward the bus only need to manufacture cpu plug-ins, memory plug-ins, and I/O plug-ins according to these specifications. Connecting them to the bus allows them to operate without considering the detailed operations of the bus. 4) Simplifies system structure. The overall system structure is clear. There are fewer connections, and backplane wiring can be printed. 5) Good system expandability. First, scale expansion merely requires inserting more plug-ins of the same type. Second, functional expansion only requires designing new plug-ins according to bus standards, and there are often no strict restrictions on where the plug-ins are inserted into the machine. 6) Good system update performance. Because the cpu, memory, I/O interfaces, etc., are connected to the bus according to bus protocols, new plug-ins can be designed at any time as processor chips and other related chips advance, provided the bus design is appropriate. Inserting new plug-ins into the backplane updates the system, and other plug-ins and backplane wiring generally do not need to be changed. 7) Facilitates fault diagnosis and maintenance. Using a motherboard test card makes it easy to locate faulty parts and identify the bus type.

WETRON automation 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 a rate of 187.5kbps is used, 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' introductory materials often lack clarity on this description. In actual use, the scope of the entire network must be considered. Electromagnetic signals take time to transmit 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, inevitably receiving interference from the surrounding electromagnetic environment during transmission. 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 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, the electrical signals of the fieldbus are electrically isolated from the interior of the equipment. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices in the entire network segment. Without isolation, high-voltage signals will continue to damage other circuits inside the equipment, 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 for 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 the connectors. 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be used at the two terminals 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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