German KEB plug, KEB model, KEB price

KEB plug terminal blocks, as a type of connector, are important components in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start troubleshooting by checking interfaces, i.e., terminals, the design of terminal blocks is particularly important. Terminal blocks can be classified into: European-style terminal block series, pluggable terminal block series, transformer terminal blocks, building wiring terminals, barrier-type terminal blocks, spring-type terminal blocks, DIN rail-mounted terminal blocks, wall-through terminal blocks, and optocoupler terminal blocks. The plastic insulation materials and conductive parts of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals respectively.

KEB plug features

1) Developing towards miniaturization, high density, and high-speed transmission; 2) Developing towards high performance and high-frequency technology; 3) There is also a large market demand for high-voltage and high-current connectors; 4) Connectors are also developing towards anti-interference technology, modularization, and lead-free technology. As the rate of traditional parallel synchronous digital signals approaches its limit, high-speed serial transmission is a good solution. This makes Low-Voltage Differential Signaling (LVDS) the main electrical standard for next-generation high-speed signals. The selection of high-speed connectors has become a major issue to resolve for high-rate signal interconnection. Several key technologies adopted in the development of high-speed connectors include: 1) Differential signaling, noise-free signaling, and ground plane technologies used to reduce crosstalk; 2) Adjusting connector leads to compensate for delay differences caused by unequal physical distances between connector inputs and outputs; 3) To achieve maximum transmission efficiency, the characteristic impedance of the connector should match the characteristic impedance of the transmission circuit.

KEB plug types

Common data buses include ISA, EISA, VESA, PCI, etc. "Address bus AB" is dedicated to transmitting 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 width of the address bus determines the size of the memory space that the CPU can directly address. For example, if an 8-bit microcomputer has an 16-bit address bus, its maximum addressable space is 2^16=64KB. A 16-bit microcomputer (x-bit processor refers to the number of bits (1, 0) the microprocessor can process in one clock cycle, i.e., the word size) has an 20-bit address bus, 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 acknowledgment 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 depends on the specific control signal, and information flow is generally bidirectional. The width of the control bus is determined by the actual control needs of the system. In practice, the specifics of the control bus mainly depend on the CPU. Based on the data transmission method, buses can be divided into serial buses and parallel buses. In serial buses, binary data is sent bit by bit to the destination device via a single data line; parallel buses typically have more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. Based 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, while RS232 uses an asynchronous serial bus.

KEB plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also 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 using standard cable can reach 200m; if using a rate of 187.5kbps, it can reach 1 000m. Communication distance has two meanings: first, the distance 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' descriptions of this are often unclear. In practical use, the entire network range must be considered. Electromagnetic signals take time to propagate through cables. Especially in some high-speed fieldbuses, increasing the distance requires modifying certain communication parameters; 2) Cable selection. The site environment determines the fieldbus communication speed and medium. Generally, fieldbus transmits data via electrical signals, inevitably affected by the surrounding electromagnetic environment during transmission. Most fieldbuses use shielded twisted pair cables. Note that different types of fieldbuses may require different shielded twisted pair cables. Fieldbus developers usually specify a special cable, and only by correctly using this cable can the specified rate and transmission distance be achieved. In extremely harsh 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 internal equipment. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it can damage the bus transceivers of all devices on the segment. Without isolation, high voltage signals can continue to damage other internal circuits of the equipment, leading to serious consequences; 4) Shielding. The outer layer of the shielded cable used for 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 prohibited to avoid ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations for connectors, but improper handling can affect system communication. For example, fieldbus generally uses a bus-type daisy-chain connection. When connecting each device, attention must be paid to how to insert and remove devices without affecting existing communication, which places certain requirements on connectors; 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection. Resistive matching should be used at both ends of each fieldbus segment. The first purpose is to absorb reflections, and the second is to ensure correct voltage levels at both ends of the bus to guarantee communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the control field's requirements for cost reduction, improved reliability, enhanced maintainability, and intelligent data acquisition.

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