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BMXXBP0400H施耐德产品前面的我们称为主程序,在FEND后面的我们称为子程序。SRET表示子程序结束,或者叫子程序返回。我们要注意,在FEND与SRET之间的程序,我们称为第一个子程序,在第二个SRET之前的我们称为第二个子程序。当我们按下X001的时候,指针调用到P11,程序开始从P11这个地方从上往下开始执行,当碰到第一个SRET的时候,程序又返回到主程序中,但是在这个程序中如果X002被接通,那么程序指针则调用到P12,程序开始从上到下运行,当碰到第二个SRET的时候,程序返回到P12这个地方,然后在碰到第一个SRET的时候,返回到主程序。因为P12这个程序是嵌套在P11这个程序中的,所以我们要注意,在PLC中这种程序嵌套多只能使用5级。
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