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联系我时,请说是在牵牛钢材网上看到的,谢谢!
6ES5095-8MB04
6ES5095-8MB04
6ES5095-8MB04
S7-200的指令是不能直接连在“母线”上的,这不符合语法要求。
SM0.0是不可控的触点,适用于无条件触发的场合,并非每个指令都需要SM0.0。在其它场合,要用可控制的触点来触发指令,如I0.0、M0.0或各种比较指令等等。如果没有可控触点可用,就只能用SM0.0。
a、S7200编程中有规定,在输出类指令前必须有触点指令,有的时候输出指令不需要条件直接输出为1,但为了满足这样的编程约定就串连常为1的sm0.0在前面。
b、不同PLC厂家都有自己语法规定,SIEMENSS7-200梯形图就这样要求的,不能母线直接连输出指令(或子程序调用)。
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