Fieldbus Techniques And The Desigen Of Intelligent Node For Slave Station Based On PROFIBUS-DP

PROFIBUS-DP is based on the first part of German industrial standard DIN19245 , enlarge the correspondence function according to the target for attain needed, DP baud rate can reach to 12 Mbits/s, used for the high-speed data spreading the feeling machine and carries out machine class deliver, constituting the single master station system generally, the master station and the slave station adopt circulation data delivers way work.The PROFIBUS-DP agreement used the first layer, the two layer and the customer connect layer of the ISO/OSI model. This kind of structure for simplify insures a high-speed data to deliver. The direct data network reflects to be like procedure(DDLM) provide a interview to the 2 layers. This kind of the PROFIBUS agreement for the high speed deliver is applicable to the correspondence of programmable controller and the spot dispersion I/O equipments specially.This text designed an intelligence node as slave station(DP-8DO), the SPC3 communication controller producted by the Siemens company is the core of its hardware structure, through the light and electricity coupling it connects with the industrial spot. The signal processing part mainly includes A/D, the D/A electric circuit, the low transit of filtrate wave electric circuit, the signal enlarges electric circuit, the electric current/electric voltage converts electric circuit, carrying out the function of the process outputs passage and the process inputs passage. String E~2PROM electric circuit and the WDT electric circuit is used for depositing the enactment parameter and the surveillance controller, the DIP enactment switch is used for the enactment of the communication wave rate and communication address. The communication controller carry out the network function through...