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With the improvement of feed production technology , consisting of computer-based and control , management , decision-making as one of the DCS system plays an increasingly important role in the production of feed . This article is based on practical engineering background , research and discussion on the design of a new generation of feed processing production line automatic control system . The characteristics of the system , not only the industrial control computer system and PLC integration , and in some areas used field bus ( FCS ) is a new type of distributed control system . Firstly, according to the technological requirements of feed processing lines proposed control scheme , and then describes the structure of the system hardware and software design . The system selected the company SIEMENS S7-300 series PLC , configuration software WinCC 6.0 , to use PROFIBUS-DP fieldbus protocol to build a distributed PLC control system , the digitized signal transmission , so that the traditional distributed control system functions further expansion. In the analysis focuses on the hardware design of the electrical field device layer design principle , field control station building and the design of the communication network . PLC software design , because of the diversity of the feed processing technology , the complexity of the control system and PLC programming emphasis on logic design , feed processing control program portability and scalability , system maintenance is not conducive to future and extensions. Therefore, we draw on a modular object-oriented programming ideas , industrialized function module design method , both for the convenience of the the large PLC program collective collaborative development , but also makes the program easy to additions, deletions and maintenance , but also shorten the development cycle of the program . In the design of the system configuration software WinCC , covers the entire the feed process flow analysis, as well as the configuration of the system communication , graphical interface configuration , variable configuration global script design . The article also apply classical control theory of PID algorithm to achieve a the shredder direct automatic frequency control . The system has been put into practical operation , the performance of a friendly interface, stable operation , etc. , to achieve the design goal . Practice has proved that this system can be applied not only in the feed processing industry , can also be used in the process control industry, chemical, food , cement , medicine and other needed ingredients .
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