FF H1 fieldbus overview

FF H1 fieldbus Fieldbus H1 FF is the responsibility of the Fieldbus Foundation developed. FF Foundation members from the instrument manufacturers and users in the world famous, whose members produce the transmitter, DCS, actuators, flow meters accounted for 90% of the world market, they control the scene of the industrial network needs a thorough understanding of process functionality in the process control we have accumulated a wealth of experience, proposed more comprehensive fieldbus network architecture, as shown in the communication architecture shown. Type9 Fieldbus is a subset of Type1 fieldbus. Communication Architecture FIG. FF H1 Fieldbus protocol is increased by the physical layer, data link layer, the application layer, and take into account the particular application and control function of the field device user layers. H1 bus supports a variety of transmission media: twisted pair, cable, optical cable, and wireless media. Transmission rate 31.25Kbps, the maximum communication distance of 1900 m. The bus supports bus-powered and intrinsically safe. The data link layer is responsible for implementing Link Active Scheduler, transmission and reception of data, in response to the active state, the bus-link time synchronization between devices. Here, the bus access control using Link Active Scheduler (LAS) mode, LAS has a list of all devices on the bus, which is responsible for the operation of each device on the bus on the bus segment. Fieldbus field bus access layer consists of (FAS) sub-layer and the Fieldbus message specification (FMS) sublayer. FAS sublayer provide publisher / subscriber, client / server, and reports circulated three modes of messaging services. FMS sub-layer provides an object dictionary (OD) service, variable access services and events services. Fieldbus standard user layer having a function block (FB) and the function of the device described. 32 kinds of standard function blocks, field devices using these functional blocks to complete the control strategy. Since the device includes all the information needed to describe the function of the communication apparatus described, and independent of the main station, the field device can achieve true interoperability. Technology area Realize the allocation reading and writing release function of Linux system memory The CAN bus has become a bus standard for the electric system. Electric Vehicle Electronic System Design Based on CAN Bus Control Virtual oscilloscope design for embedded system USB interface Is the distance or speed, let the design RS485 system are in trouble

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