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PEAK-System 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. Their reliability 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 appearance, structure, and application.

PEAK-System 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 change 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.

PEAK-System plug features

Field control devices have communication functions, facilitating the construction of factory bottom-layer control networks. The openness and consistency of communication standards give the system openness and interoperability between devices. Standardization of function blocks and structures ensures interchangeability between devices with the same functions. Downgrading control functions to the field gives the control system structure a high degree of dispersion. Fieldbus brings automatic control devices and systems into the realm of information networks, opening up broader fields for their application; multiple control devices can be connected on a pair of twisted pairs, facilitating installation cost savings; reducing maintenance expenses; improving system reliability; and providing users with more flexibility in system integration.

PEAK-System 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 need to 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' descriptions of 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, if the distance is increased, some communication parameters must be modified; 2) Cable selection. The field environment determines the fieldbus communication speed and medium. Generally, fieldbuses use electrical signals to transmit data, which are inevitably affected by the surrounding electromagnetic environment during transmission. Most fieldbuses use shielded twisted pairs. It must be noted that different types of fieldbuses may require different shielded twisted pairs. 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 device interior. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices in the 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 by the 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 generating ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations on 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 devices without affecting existing communication conditions, which places certain requirements on connectors; 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, have reflection phenomena. Resistive matching should be used at the two terminals of each network segment of the bus. The first function is to absorb reflections, and the second is to achieve correct electrical 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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