Remote Intelligent I/O and Fieldbus Technology

Abstract: The technical information of remote intelligent I/O and fieldbus is provided by the excellent flowmeter and flowmeter manufacturers. With the rapid development of computer networks, the structure of industrial automation control has been continuously changed. The traditional 4~20mA analog signal system will be gradually replaced by the two-way digital communication field bus system, and the analog/digital DCS system will be updated. for all. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of remote intelligent I/O and fieldbus technical articles. With the rapid development of computer networks, the structure of industrial automation control has been continuously changed. The traditional 4~20mA analog signal system will be gradually replaced by the two-way digital communication field bus system, and the analog/digital DCS system will be updated. It is an all-digital fieldbus control system. 1. Remote intelligent I/O The application of remote intelligent I/O enables the process signal to be digitally processed on the spot, thereby greatly improving the measurement and control accuracy of the system. In addition, the anti-interference ability, reliability and environmental adaptability have also been improved. These have promoted the development of field bus and accelerated the process of digitization and intelligence of field primary components. Smart transmitter is the result of the penetration and fusion of remote smart I/O and field primary components. 1. The composition and working principle of the remote intelligent I/O The design of the remote intelligent I/O adopts the network communication technology of DCS and the field processing control technology of PLC and single-loop controller. The purpose is to decentralize the DCS system and realize the remoteization of process I/O. and intelligent. The remote intelligent I/O system is generally composed of: (1) the intelligent front end located on the scene; (2) the communication bus; (3) the computer adapter. The number of channels in an intelligent front end is generally 15 to 20. The working principle of the remote intelligent I/O is: after the intelligent front-end computer collects and processes the field signals nearby, it transmits the processing results to the computer through the network bus and adapter by digital communication, and performs comprehensive arithmetic processing for display, analysis and analysis. Control; the data processed by the computer is transmitted to the field control front-end machine through the adapter and the network bus, and the control front-end machine sends out adjustment signals to the field equipment in a predetermined way to realize the data acquisition and control of the industrial process and equipment. The core technology of remote intelligent I/O is communication network and front-end intelligence. 2. Features of intelligent I/O (1) High anti-interference ability and high measurement and control accuracy The remote intelligent I/O is used to process signals nearby and transmit information through digital communication, which has strong anti-interference ability and improved processing accuracy. The measurement accuracy of the analog signal can reach above 0.1 level, and the switch value resolution can be as high as lms. (2) The load of the host is reduced to facilitate expansion and addition of management functions. The I/O front-end machine has a high degree of intelligence and strong data processing capabilities. All I/O management tasks can be completed by the adapter, which greatly liberates the host and facilitates function expansion. And achieve advanced control and management functions. (3) High reliability. The isolated floating serial network bus structure is used to avoid the electromagnetic interference caused by the ground return that may be caused by the common ground of multi-point I/O; each front end is electrically isolated from the network. Independent operation, any failures and dangers are limited to local areas, and the reliability is greatly enhanced. . (4) The openness is good. The remote intelligent I/O can easily change the adapter type to meet various computer and bus systems. Especially using the remote I/O system with multiple host networks, it is easy to form various control and monitoring systems, integrate into the management information system and the whole network dispatching system, and make it a real-time MIS system with on-site information, which is suitable for unified dispatching and optimization. Management and coordination control are important. 2. Fieldbus Fieldbus refers to a data bus of digital, serial and multi-point communication between field devices installed in manufacturing or process areas and automatic control devices in the control room. The field bus can generally use twisted pair, coaxial cable and optical fiber. At present, twisted pair or shielded twisted pair is mostly used. . 1. The composition of the field bus (1) the field intelligent instrument (mainly refers to the intelligent transmitter) (2) the bus communication part (3) the computer interface 2. Types of Fieldbus Devices The types of Fieldbus devices are Link Control Stations and Basic Field Devices. The link control station controls the information flow of digital messages on the field bus. It allows each field device to send data messages according to the time schedule generated when the system is configured. Data communication enables field devices to not only send single-variable information, but also to send Multivariate information. 3. communication method·In terms of communication mode, synchronous transmission can be used, asynchronous transmission can also be used, and duplex and half-duplex modes can be used. However, there are still big differences in specific communication protocols. For remote intelligent I/O. Almost all manufacturers have their own protocols, which are not compatible with other products, but because they can handle on-site analog signals, they have little impact on the operation of the entire system.’4. HART protocol HART protocol is an addressable remote sensor data highway developed by ROSMOUNT in the mid-1980s. It adopts frequency shift keying method on the basis of BELL202, uses 1.2kHz and 2.2kHz, and simulates at 4~20mA. The digital signal transmission is completed on the signal.

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