System and Its Communication Technology
Liu Ming,Shi Ren
(School of Electronics and Information Engineering,Xi'an Jiaotong Univercity 710049,China)
Abstract:The real-time requirement in monitior and control restricts the development of opening distributed control system (DCS). From this point, a comprehensive scheme is proposed for quickening communication speed of opening DCS. The scheme quickens the communication speed between supervisor and instruments from two aspects of hardware and software. Some technologies in hardware, such as separating supervisor into monitor station and communication station, using dual RAM intelligent communication card, multiple serial communication and selection of instrument, are used in the scheme to improve the system real-time property and reinforce the communication security. Multithread technology and optimizing communication data in software are applied in the scheme to quicken the communication speed. A practical opening DCS of Phenol Acetone product line was rebuilt by this scheme. The result shows that the communication speed of this system was improved more than 40 times. This engineering instance validated the feasibility of this scheme. Therefore an effective technique for the design of largescale opening DCS is provided.
Keywords:opeing DCS;serial communication;multithread;intelligent communication card