German Vision & Control plugs, Vision & Control models, Vision & Control prices

Vision & Control plugs are a standardized method for exchanging data (data) between computer components, providing data transmission and control logic to each component in a universal way. From another perspective, if the motherboard (Mother Board) is a city, then the bus is like the public buses (bus) in the city, 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 adopted simultaneously to send more data, and the amount of data 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).

Vision & Control plug 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 feature. 1) Fieldbus Control System: Its software is an important part 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 collects data in real time, processes data, and performs calculations. It optimizes 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 strong 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. It is installed in the main computer and completes management functions, forming a comprehensive management system information library for field devices. On this basis, equipment reliability analysis and predictive maintenance are realized, changing the passive management mode to a predictable management and maintenance mode. The AMS software is based on a T architecture with the field server as the platform, supporting modular, rich-function 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 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 relational and real-time database system capable of mutual access and operation has been 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, Vines, and server operating software such as Lunix, os/2, and Window NT. Application software databases, communication protocols, network management protocols, etc.

Vision & Control plug classification

Industrial bus networks can be categorized into three types: 485 networks, HART networks, and FieldBus fieldbus networks. 485 Networks: 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 Networks: 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 cards] and support HART communication functions. However, from the domestic perspective, this functionality has not been 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 difficult networking, the application of HART instruments will show a downward trend. FieldBus Fieldbus Networks: 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 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 in parallel, each having its own space for survival. When unification will occur is uncertain. There are relatively few types of instruments supporting fieldbus, limited choices, higher prices, and smaller usage volumes.

Vision & Control plug selection factors

PC communication with smart devices often 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 independently, 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 an RS485 network to exchange information, it can only be achieved through relay by a "Master (Master)" device. This master device is usually a 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, featuring a complete software support system capable of solving problems such as bus control, conflict detection, and link maintenance.

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