German Releco plug Releco model Releco price

Releco plugs are conductive devices that bridge two conductors in a circuit, allowing current or signals to flow from one conductor to another. An electronic connector is an electromechanical system that provides a separable interface for connecting two subsystems. Simply put, components used to complete electrical connections between circuits or electronic machines are called connectors, acting as a bridge between them. In addition to meeting general performance requirements, it is particularly important that electrical connectors achieve good contact, reliable operation, and ease of maintenance. Whether they operate reliably directly affects the normal operation of aircraft circuits and involves the safety of the entire host. For this reason, host circuits have very strict requirements for the quality and reliability of electrical connectors. It is precisely because of the high quality and high reliability of electrical connectors that they are also widely used in military systems such as aviation, aerospace, and national defense. Common classification methods for electrical connectors include appearance, structure, and application.

Releco plug working principle

If the motherboard (Mother Board) is a city, then the bus is like the public buses (bus) in the city, transporting bits (bit) that operate back and forth along fixed routes. These lines can only transmit one bit at a time. Therefore, multiple lines must be used simultaneously to transmit more data. The number of data bits that the bus can transmit simultaneously is called the width (width), measured in bits. The greater the bus width, the better the transmission performance. The bus bandwidth (i.e., the total amount of data that can be transmitted per unit time) is: Bus Bandwidth = Frequency x Width (Bytes/sec). When the bus is idle (other devices are connected to the bus in a high-impedance state) and a device needs to communicate with a target device, the initiating device drives the bus, sending address and data. Other devices connected to the bus in a high-impedance state, upon receiving (or being able to receive) address information matching their own, accept the data on the bus. After the sending device completes communication, it releases the bus (output changes to high-impedance state).

Releco plug material

Material selection is based on a comprehensive consideration of processability, product applicability, and strength properties. The cost of electronic connectors varies depending on material prices, processing difficulty, and production efficiency. Electronic connector materials mainly include insulator materials (plastic raw materials) and conductor materials (phosphor bronze, brass). Common engineering plastics used in electronic connectors are: LCP, NYLON, PBT. 1) LCP: Features a low coefficient of linear expansion, low injection molding shrinkage, outstanding strength and elastic modulus, and excellent heat resistance. It has a high load deformation temperature, with some grades exceeding 340 degrees. LCP also offers excellent chemical resistance and air tightness. Therefore, LCP is the preferred material for general connectors, especially those requiring SMT, eg:MINI PCI EXPRESS; DDR. 2) NYLON: Lower cost, very high tensile strength, outstanding wear resistance and self-lubricity, good flowability beneficial for thin-wall molding. However, it shrinks significantly and is prone to burrs. Strict baking is required before molding to prevent hydrolysis. General connectors, especially DIP, mostly use NYLON material, eg:PCI 120P; PCI EXPRESS. 3) PBT: Plug-in electronic connectors. Low cost, high strength, wear-resistant, but poor moldability and significant shrinkage. Due to the lower melting temperature, plastic melting phenomena may occur during wave soldering.

Releco plug precautions for use

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 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 on this point. In actual use, the scope of the entire network must be considered. Electromagnetic 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 uses electrical signals to transmit data, 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 generally specify a special cable, and the specified rate and transmission distance can only be achieved when this cable is used correctly. 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 will damage the bus transceivers of all devices on 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 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 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 equipment without affecting existing communication, which places certain requirements on the connectors. 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection. Resistive matching 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 reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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