This paper introduces the PROFIBUS fieldbus standard and the PROFIBUS-DP intelligent slave station for shaftless printing equipment developed using the communication protocol chip SPC3. The hardware circuit of SPC3 and C8051F020 single-chip microcomputer and the related software design flow chart are given, as well as the configuration and software debugging of the soft PLC master station in the CODESYS software environment. PROFIBUS is the abbreviation of Process Fieldbus, which is an international open fieldbus standard, namely the ENSO170 European standard. At present, many automation technology manufacturers in the world provide PROFIBUS interfaces for equipment. PROFIBUS has been widely used in processing and manufacturing, process and building automation, logistics and other fields. According to the application characteristics, it is divided into three compatible versions: PROFIBUS-DP, PROFIBUS-FMS, and PROFIBUS-PA. The PROFIBUS protocol orientation is based on the ISO7498 international standard and takes the open system interconnection network OSI as the reference model. PROFIBUS DP, FMS and PA all use a single bus access protocol, which can be implemented through the second layer of the OSI reference model, including data reliability and transmission protocol and message processing. Among them, PROFIBUS-DP can be used for communication design between automatic control system and equipment-level distributed I/O after optimized high-speed and low-cost communication connection. This project mainly uses PROFIBUS fieldbus technology to provide reliable and fast data transmission for controlling a large number of I/O nodes and data collection of various sensors on the printing machine. It designs and develops intelligent slave stations based on the bus protocol chip SPC3, which not only realizes communication in the experimental environment, but also successfully passes the debugging on the printing equipment.
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