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1786-FS100

2016/8/16 8:54:28 来源: 厦门泰尼电气有限公司

1786-FS100

1786-FS100

1786-FS100



状态法编程思想其实就是将复杂的顺序控制过程分解为若干个工作“状态”,然后分别进行编程,最后再组合成整体程序。这种编程方法可以使编程工作程序化和规范化,是 PLC 程序设计的重要方法。状态转移图是状态编程的工具,图中包含了顺序控制程序所需用的全部状态及各状态间的相互联系。对某一具体状态来说,状态转移图给出了该状态的驱动任务、状态转移的条件和状态转移的方向。因此,状态转移图可以非常清晰地表达出顺序控制的整个工艺流程,形象直观,可读性很强,特别在复杂的顺序控制程序中应用起来非常方便。


例如,某 PLC 控制的送料小车,小车原位停止时压下限位开关 SQ1(X0),按下启动按钮 SB(X2),Y2接通小车前进,当运行到料斗下方时压下限位开关SQ2(X1),Y2 断开小车停止,同时 Y0 接通料斗门打开给小车加料,延时 10 秒后关闭料斗,Y3 接通小车后退返回,当回到原位时压下限位开关 SQ1(X0),Y3断开小车停止,Y1 接通小车底门打开卸料,延时 8 秒后卸料结束,完成一次动作,并可以循环。





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