German LEMO connector, LEMO model, LEMO price

LEMO connectors provide a standardized method for exchanging data between computer components, offering a universal approach to data transmission and control logic among components. From another perspective, if the Mother Board is likened to a city, then the bus acts like public buses within that city, transporting constantly operating bit along fixed routes. Each line can only transmit one bit at a time. Therefore, multiple lines must be used simultaneously to send more data. The amount of data the bus can transmit simultaneously is called the 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 calculated as: Bus Bandwidth = Frequency × width (Bytes/sec).

LEMO connector composition

The fieldbus control system consists of three parts: the measurement system, the control system, and the management system, with the hardware and software of the communication part being its most distinctive features. 1) Fieldbus control system: Its software is an important component of the system. Control system software includes configuration software, maintenance software, simulation software, device software, and monitoring software. First, select the development configuration software and the human-machine interface software for control operations. Through the configuration software, complete the connections between function blocks, select function block parameters, and perform network configuration. During network operation, the system performs real-time data acquisition, data processing, and calculations. It optimizes control and logical control, handling alarms, monitoring, display, reports, etc. 2) Fieldbus measurement system: Characterized by multi-variable, high-performance measurement, it enables measuring instruments to have computing capabilities and other functions. Due to the use of digital signals, it offers high resolution, high accuracy, strong anti-interference, and anti-distortion capabilities. It also provides status information of instrument equipment, allowing adjustments to the processing process. 3) Equipment management system: Provides diagnostic information, management information, equipment operating status information (including smart instruments), and manufacturer-provided equipment manufacturing information for both the equipment itself and the process. For example, Fisher—Rosemoune Company launched the AMS management system. Installed on the main computer, it performs management functions and can form a comprehensive management information database for field devices. Based on this, equipment reliability analysis and predictive maintenance are realized, changing passive management into a predictable management and maintenance mode. The AMS software is based on a T architecture with the field server as the platform. Supporting modular, feature-rich application software on the field server, it provides users with a graphical interface. 4) Bus system computer service mode: The client/server mode is a popular network computer service mode. The server represents the data source (provider), while the application client represents the data user, which obtains data from the source and processes it further. The client runs on a PC or workstation. The server runs on a minicomputer or mainframe, utilizing the intelligence, resources, and data of both parties to complete tasks. 5) Database: It can organically and dynamically store large amounts of data and applications, achieving full data sharing and cross-access with high independence. Industrial equipment parameters change continuously during operation, involving large data volumes and high real-time requirements for operation and control. Thus, a distributed relational and real-time database system capable of mutual access and operation is formed. Mature options available on the market include relational databases such as Oracle, sybas, Informix, and SQL Server; and real-time databases such as Infoplus, PI, and ONSPEC. 6) Network system hardware and software: Network system hardware includes system management hosts, servers, gateways, protocol converters, hubs, user computers, and underlying intelligent instruments. Network system software includes network operating software such as NetWarc, LAN Mangger, and Vines; server operating software such as Lunix, os/2, and Window NT; as well as application software databases, communication protocols, and network management protocols.

LEMO connector features

Field control devices feature communication capabilities, facilitating the construction of the plant's lower-level control network. The openness and consistency of communication standards ensure system openness and interoperability between devices. Standardization of function blocks and structures enables interchangeability among devices with identical functions. Decentralizing control functions to the field level provides the control system architecture with a high degree of distribution. Fieldbus technology integrates automation devices and systems into information networks, opening up broader application fields; multiple control devices can be connected on a single twisted-pair cable, reducing installation costs; lowering maintenance expenses; improving system reliability; and providing users with greater flexibility in system integration.

LEMO connector selection criteria

Communication between PC and intelligent devices often relies on RS232, RS485, Ethernet, and other methods, primarily depending on the device's interface specifications. However, RS232 and RS485 only represent the physical media and link layers of communication. To achieve bidirectional data access, one must write custom communication applications, but most such programs do not comply with ISO/OSI standards, can only achieve relatively single functions, are suitable for single device types, and lack universality. In a device network formed by RS232 or RS485 devices, if the number of devices exceeds 2, RS485 must be used as the communication medium. Information exchange between devices in an RS485 network can only be achieved through relay by a "Master" device. This master device is usually the PC, and only one master device is allowed in such a device network, with all others being Slave devices. Fieldbus technology is based on the ISO/OSI model, featuring a complete software support system capable of resolving issues such as bus control, collision detection, and link maintenance.

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