German Mahr plug Mahr model Mahr price

Mahr plug is a standardized method for exchanging data (data) between computer components, providing data transmission and control logic for various components in a universal way. From another perspective, if the motherboard (Mother Board) is a city, then the bus is like a public bus (bus) in the city, capable of transmitting bits (bit) that operate back and forth along fixed routes. These lines can only be responsible for transmitting one bit at a time. Therefore, multiple lines must be used simultaneously to send more data, and the amount of data that the bus can transmit simultaneously is called 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 × Width (Bytes/sec).

Mahr plug composition

The Fieldbus Control System consists of three parts: measurement system, control system, and management system, with the hardware and software of the communication part being its most distinctive feature. 1) Fieldbus Control System: Its software is an important part of the system. The control system software includes configuration software, maintenance software, simulation software, device software, and monitoring software. First, select the development configuration software and the control operation human-machine interface software. Through the configuration software, complete the connections between function blocks, select function block parameters, and perform network configuration. During network operation, collect data in real-time, process data, and perform calculations. Optimize control and logical control alarms, monitoring, display, reports, etc. 2) Fieldbus Measurement System: Its characteristics include multi-variable high-performance measurement, enabling measuring instruments to have computing capabilities and other functions. Due to the use of digital signals, it has 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: It can provide diagnostic information, management information, equipment operating status information (including smart instruments), and manufacturer-provided equipment manufacturing information for the equipment itself and the process. For example, Fisher—Rosemoune Company launched the AMS management system, which is installed in the main computer to complete management functions. It can form a comprehensive management system information library for field devices, based on which equipment reliability analysis and predictive maintenance are realized. This changes the passive management mode to a predictable management and maintenance mode. The AMS software is based on a T type structure with the field server as the platform, supporting modular, feature-rich application software on the field server to provide 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), and the application client represents the data user, which obtains data from the data source and further processes it. The client runs on a PC machine or workstation. The server runs on a minicomputer or mainframe, using 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, with large data volumes and high real-time requirements for operation and control. Therefore, a distributed and real-time database system with mutual access operations has been formed. Mature options on the market include relational databases such as Oracle, sybas, Informix, SQL Server; and real-time databases such as Infoplus, PI, ONSPEC. 6) Network System Hardware and Software: Network system hardware includes: system management host, server, gateway, protocol converter, hub, user computer, and underlying intelligent instruments. Network system software includes network operating software such as: NetWarc, LAN Mangger, Vines, server operating software such as Lunix, os/2, Window NT. Application software databases, communication protocols, network management protocols, etc.

Mahr plug classification

Industrial bus networks can be categorized into three types: 485 network, HART network, and FieldBus fieldbus network. 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 the simple reason that RS485 conversion interfaces are not only cheap but also diverse. 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 the 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 been working on it, but they 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 functionality has not been truly used for equipment networking and monitoring; at most, handheld configurators are used to set parameters. In the long run, due to reasons such as low HART communication speed and difficult 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 local area network of the automation field. Its emergence marks the beginning of a new era in automation control technology. Fieldbus is a digital, serial, multi-station communication network connecting instruments at the control site 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 network-communication-based 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 survival space. When unification will occur remains uncertain. There are relatively few types of instruments supporting fieldbus, limited choices, higher prices, and smaller usage volumes.

Mahr plug selection factors

PC communication with smart devices mostly relies on RS232, RS485, Ethernet, and other methods, mainly depending on the device's interface specifications. However, RS232 and RS485 only represent the physical media layer and link layer of communication. To achieve bidirectional data access, one must write communication applications themselves, but most of these programs do not comply with ISO/OSI specifications, 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. For devices in the RS485 network to exchange information, it can only be achieved through transit by a "Master (Master)" device. This master device is usually PC, and only one master device is allowed in such a device network, with all others being Slave (Slave) devices. Fieldbus technology is based on the ISO/OSI model, with a complete software support system capable of solving problems such as bus control, conflict detection, and link maintenance.

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