German GRAEFF plug GRAEFF model GRAEFF price

GRAEFF 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 devices 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 easy maintenance. Whether they operate reliably directly affects the normal operation of aircraft circuits and involves the safety of the entire host. Therefore, 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 shape, structure, and application.

GRAEFF 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, modular 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 also 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.

GRAEFF plug classification

Industrial bus networks can be categorized into three types: 485 networks, HART networks, and FieldBus fieldbus networks. 485 network: RS485/MODBUS is a popular industrial networking method, characterized by simple and convenient implementation, and there are many instruments supporting RS485. Instrument manufacturers have also turned to support RS485/MODBUS for a simple reason: RS485 conversion interfaces are not only inexpensive but also available in a wide variety. At least in the low-end market, RS485/MODBUS will remain the primary industrial networking method. HART network: HART is a transitional bus standard proposed by Emerson, mainly characterized by superimposing digital signals on a 4-20 mA current signal. However, this protocol is not truly open; one must join its foundation to obtain the protocol, which requires a certain fee. HART technology is mainly monopolized by several large foreign companies. In recent years, domestic companies have also engaged in this area, but have not yet reached the level of foreign companies. Many smart instruments come with [HART round card] and support HART communication functions. However, from the domestic perspective, this function is not truly used for device networking and monitoring; at most, handheld communicators are used to set parameters. In the long run, due to reasons such as low HART communication rates and difficulties in networking, the application of HART instruments will show a downward trend. FieldBus fieldbus network: Fieldbus is one of the hot technologies in the automation field today, hailed as the computer LAN of the automation domain. Its emergence marks the beginning of a new era in automation control technology. Fieldbus is a digital, serial, multi-station communication network connecting field instruments with control devices in the control room. Its key hallmark is the ability to support bidirectional, multi-node, bus-style fully digital communication. Fieldbus technology has become a hotspot in the international development of automation and instrumentation. Its emergence has brought revolutionary changes to traditional control system structures, further advancing automatic control systems towards "intelligence, digitization, informatization, networking, and decentralization," forming a new type of networked communication fully distributed control system—the Fieldbus Control System FCS (Fieldbus Control System). However, fieldbus has not yet formed a truly unified standard. Multiple standards such as ProfiBus, CANbus, and CC-Link coexist, each with its own niche. Unification remains distant. There are relatively few types of instruments supporting fieldbus, leaving little room for choice, higher prices, and smaller usage volumes.

GRAEFF 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 applied. 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' introductory materials often lack clarity on this description. In actual use, the scope of the entire network must be considered. Electromagnetic wave 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 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. 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 usage of this cable. In 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 network segment. If not isolated, 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 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 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 connectors. 6) Termination matching. Like all electromagnetic wave signals, fieldbus signals exhibit reflection phenomena. Resistive matching should be adopted 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 control field's requirements for reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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