German Vimar plug Vimar model Vimar price

Vimar 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, fence-type terminal blocks, spring-type terminal blocks, DIN rail terminal blocks, bulkhead 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.

Vimar plug structure

An electrical connector consists of a fixed-end electrical connector, i.e., female contacts (referred to as socket), and a free-end electrical connector, i.e., male contacts (referred to as plug). The socket is fixed to the powered component via its square (round) flange (some also use welding), while the plug is generally connected to the cable, achieving the connection between plug and socket through a coupling nut. An electrical connector is composed of three basic units: shell, insulator, and contact body. 1) Shell: The electrical connector shell refers to the housing of the plug and socket, the coupling nut, and the rear accessories. The housing protects internal parts of the electrical connector, such as insulators and contacts (collectively referred to as pins and sockets), from damage. The positioning key slots on top ensure proper alignment of the plug and socket. The coupling nut is used for connecting and disconnecting the plug and socket. Rear accessories protect the wire-to-contact termination points from damage and secure the cable. The shell also provides a certain degree of electromagnetic shielding. Shells are generally made from aluminum alloy (machined, cold extruded, or die-cast). Steel shells are mostly used for glass-sealed and high-temperature resistant electrical connectors. 2) Insulator: Composed of pin insulators, socket insulators, interface seals, and wire seals. It keeps pins and sockets in their designated positions and ensures electrical insulation between individual contacts and between contacts and the shell. Sealing measures are achieved through insulators combined with interface and wire seals to improve the environmental resistance of the electrical connector. To adapt to high temperature, low temperature, and flame retardancy requirements, and to ensure stable and reliable geometric dimensions of parts, insulators are mostly molded from thermosetting plastics. Interface seals and wire seals are formed by molding silicone rubber, etc. 3) Contact body: The contact body includes male and female contacts, sometimes referred to as pins and sockets. Connection methods include soldering, crimping, press-fit, and wire-wrap, used to achieve circuit connections. Pins and sockets are key components of electrical connectors, directly affecting their reliability. Pins and sockets are mostly machined from elastic copper alloys with good conductivity, and surfaces are silver or gold plated to achieve low contact resistance and corrosion resistance. Sockets generally include split-type sockets, wire-spring sockets, crown-spring sockets, and stamped sockets. Structural features include: environmental resistance, bayonet (quick) connection, multi-key positioning (anti-misinsertion), crimped connection between contacts and wires (single-wire insertion/removal facilitates fault handling). The shell plus shielding ring ensures 360° electromagnetic interference shielding capability.

Vimar plug advantages

1) The dual-bus architecture oriented towards memory offers higher information transmission efficiency, which is its main advantage. However, conflicts still occur when both the CPU and I/O interfaces 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, thereby accommodating both high-speed and slow-speed devices without mutual interference. 3) Simplifies hardware design. Facilitates modular structural design; microcomputer designs oriented towards the bus only require making cpu cards, memory cards, and I/O cards according to these specifications. Connecting them to the bus allows operation without considering detailed bus operations. 4) Simplifies system structure. The overall system structure is clear. Fewer connections; backplane wiring can be printed. 5) Good system scalability. First, scale expansion merely requires inserting more cards of the same type. Second, functional expansion merely requires designing new cards according to bus standards; the insertion positions for cards in the machine often have no strict limits. 6) Good system update performance. Because cpu, memory, I/O interfaces, etc., are connected to the bus according to bus protocols, as long as the bus design is appropriate, new cards can be designed at any time following advancements in processor chips and other related chips. Inserting new cards into the backplane updates the system, generally without requiring changes to other cards or backplane wiring. 7) Facilitates fault diagnosis and maintenance. Motherboard test cards can conveniently locate faulty areas and identify bus types.

Vimar 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 for this are often unclear. 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, increasing distance requires modifying certain communication parameters; 2) Cable selection. The site environment determines the fieldbus communication speed and medium. Generally, fieldbuses transmit data via electrical signals, inevitably receiving influence 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; only by correctly using this cable can the specified rate and transmission distance be achieved. 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 device interior. Fieldbus cables are distributed throughout various corners of the workshop. Once high voltage intrudes, it will damage the bus transceivers of all devices in the entire segment. Without isolation, high voltage signals will continue to damage other internal circuits of the device, leading to serious consequences; 4) Shielding. The outer layer of the shielded cable used by 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 will affect the communication of the entire system. For example, fieldbus generally uses 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 used at the two terminals of each fieldbus segment. The first function is to absorb reflections; 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 control field's requirements for reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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