Fieldbus is an open digital communication technology developed in response to intelligent field instruments. Its original intention was to replace the one-to-one I/O connection with digital communication and extend the digital communication network to the industrial process site. According to the definition of IEC and American Instrument Association ISA, fieldbus is a digital, bidirectional transmission, multi-branch communication network connecting intelligent field devices and automation systems. Its key symbol is to support bidirectional, multi-node, bus-based Digital communications. With the development of fieldbus technology and intelligent instrument management and control (instrument adjustment, control configuration, diagnosis, alarm, recording), this open factory bottom control network constructs a new generation of network integrated full distributed computer control System, the Fieldbus Control System (FCS). As a new generation control system, FCS adopts open and standardized communication technology, which breaks through the limitations of DCS using a dedicated communication network. At the same time, it further changes the "distributed" system structure in DCS and forms a fully distributed system architecture. The control function is completely lowered to the scene. Fieldbus control system diagram Since the smart devices scattered in the front end of the device in the fieldbus system can directly perform a variety of sensing, control, alarm and calculation functions, the number of transmitters can be reduced, eliminating the need for separate controllers, computing units, etc. In addition, DCS system signal conditioning, conversion, isolation technology and other functional units and their complex wiring are required. Industrial PCs can also be used as operating stations, saving a large amount of hardware investment. Due to the reduction of control equipment, the control room can be reduced. The footprint. The wiring of the fieldbus system is very simple. Since a pair of twisted pairs or one cable can usually be connected to multiple devices, the amount of cables, terminals, slots, and bridges is greatly reduced, and the workload of wiring design and joint proofing is also decrease very much. When it is necessary to add on-site control equipment, it is not necessary to add a new cable, and it can be connected to the original cable nearby, which saves investment and reduces the workload of design and installation. According to the calculation data of typical test projects, the installation cost can be saved by more than 60%. Because the field control equipment has the ability of self-diagnosis and simple fault handling, and sends relevant diagnostic maintenance information to the control room through digital communication, the user can query the operation of all equipment and diagnose the maintenance information, so as to analyze the cause of the fault early and quickly eliminate it. Maintenance downtime is reduced, and maintenance is reduced due to simplified system structure and simple wiring. Users are free to choose the devices provided by different vendors to integrate the system. Avoiding the choice of a certain brand of products is "framed dead" equipment, will not be incompatible with the incompatible protocols and interfaces in the system integration, so that the initiative in the system integration process is completely in the hands of users. Due to the intelligence and digitization of the fieldbus device, it fundamentally improves the accuracy of measurement and control and reduces the transmission error compared with the analog signal. At the same time, due to the simplified structure of the system, the equipment and wiring are reduced, and the internal functions of the field instrument are strengthened: the round-trip transmission of signals is reduced, and the operational reliability of the system is improved. In addition, due to its equipment standardization and functional modularity, it also has the advantages of simple design and easy reconstruction. Hall Sensor,Hall Current Sensor,Current Sensor Hall Effect,Open Loop Hall Effect Current Sensor Zibo Tongyue Electronics Co., Ltd , https://www.tongyueelectron.com