描述
根据PLC梯形图程序扫描原则,按先左后右,先上后下的步序,逐句扫描,执行程序。但遇到程序跳转指令,则根据跳转条件是否满足来决定程序的跳转地址。若用户程序涉及到输入输出状态时,PLC从输入映象寄存器中读出上一阶段采入的对应输入端子状态,从输出映象寄存器读出对应映象寄存器的当前状态。根据用户程序进行逻辑运算,运算结果再存入有关器件寄存器中。
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