摘要
通过赋予Petrinet(PN)的库所和变迁控制属性,实现了PN对典型控制系统的有效描述。根据变迁触发和标识变化的基本规则,PN的库所和变迁能够表示为由输入、输出、操作和条件组成的逻辑表达式,该表达式可以方便地转化为PLC的LAD程序。在液体混合控制系统中的应用实例表明该方法具有易于理解和修改的优点,能够极大提高PLC梯形图程序的设计效率。
By associating control attributes to the places and transitions of Petri net(PN),the effective description of typical control system by PN is realized.According to the rules of transition firing and marking processing,the places and transitions of PN can be formulated with logical expressions composed of inputs,outputs,operations and conditions. These expressions can be easily converted into the PLC LAD program.An application example in a liquid mixture system shows that the proposed method has the advantages of ease to understand and modify,and can obviously improve the design efficiency for PLC LAD program.
出处
《测控技术》
CSCD
2003年第12期62-65,共4页
Measurement & Control Technology
