多种单按钮启停控制的PLC程序设计方法

摘要

Single stop-start controls can be achieved through S7-200 counter, SHFR, trigger, setting and resetting,and basic logical instructions. Input/Output points are required in PLC controls,therefore, the fewer points are used, the more natural resources can be saved.%运用S7—200中的计数器指令、移位寄存器指令、SR触发器指令、置位和复位指令、基本逻辑指令均可实现单按钮电动机的启停控制．采用PLC控制时，要考虑PLC的输入、输出点数，点数使用越少，越能节约资源、降低成本．