基于PLC的双向地衡无人值守称重系统的设计与实现.PDF

V ol N o Chinese Journal of Engineering Design Jun doi issn X j PLC IC M icro I O IC M icro T P T P A X Design and implementation of bidirectional weighbridge unattended weighing system based on PLC Z HA NG Zhishun NIU Y u ang g Key Lab of Advanced Control and Optimization for Chemical Process M inistry of Education East China U niversity of Science T echnology Shanghai China Abstract In order to improve accuracy and operational efficiency of petrochemical product w eig hing in the process of ration loading and unloading optimize human resources and avoid all kinds of disadvantages of hand gauge the desig n and implementation method of the bidirectional w eighbridge unattended w eighing sy stem is propo sed T he sy stem w as mainly co mprised of w eighbridges inf rared grating s IC cards cameras barrier gates and so on Based on the charac teristics of the bidirectional w eighbridge unattended sy stem the auto matic control process w as described in detail T he M icro controller w as used to collect I O field data IC cards num bers and the w eighing data T he method of tw ice filtration w as adopted to deal w ith the problem of da ta instability and large measurement errors in w eighing process M eanw hile the w e