German DPM plug DPM model DPM price

DPM plug terminal blocks, as a type of connector, are an important component in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start troubleshooting by inspecting 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-type terminal blocks. The plastic insulation materials and conductive components of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals, respectively.

DPM plug features

1) Developing towards miniaturization, high density, and high-speed transmission; 2) Developing towards high-performance and high-frequency technologies; 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 technology, 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 level standard for next-generation high-speed signals. The selection of high-speed connectors has become a major issue to be resolved 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.

DPM plug material

1) The material of the female or male terminal shall be copper alloy, or plated copper alloy, nickel, or nickel alloy. [Exception: If the structure of the electrical appliance or device permits, the female or male terminal may be plated sheet, or non-plated but corrosion-resistant alloy. 2) If formed female terminals or trimmed male terminals appear in the form of terminal strips, when the terminal strip is continuously fed into the processing tool, the terminals are crimped and separated from the terminal strip, then in this case, the edges where the terminals connect to the terminal strip do not require plating. The standard terminals used in temperature and thermal cycling tests shall be tin-plated sheet or corrosion-resistant steel, according to the Rockwell 30T hardness scale, with a hardness of Rockwell 68 ± 5. Exception: If the female terminal is only suitable for connecting to male terminals made of copper alloy, then C26000 copper alloy standard terminals shall be used for testing. 2.3 According to the Rockwell 30T hardness scale, the hardness of standard terminals made of brass is 62 ± 7.

DPM plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also feature 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 cables. 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' descriptive materials often lack clarity on this. In actual 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 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. 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 when this cable is used correctly. 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 internal equipment. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices in the network segment. Without isolation, high-voltage signals will continue to damage other internal circuits of the equipment, leading to serious consequences; 4) Shielding. The outer layer of the shielded cable used in fieldbus must be grounded at one point. If high-frequency interference is severe, multi-point capacitive grounding can be used. Multi-point direct grounding is not allowed to avoid ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations on 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 phenomena. Resistive termination should be used 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 cost reduction, improved reliability, enhanced maintainability, and increased intelligence in data acquisition.

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