6ES5095-8MB04
6ES5095-8MB04
6ES5095-8MB04
S7-200的指令是不能直接連在“母線”上的,這不符合語法要求。
SM0.0是不可控的觸點,適用于無條件觸發(fā)的場合,并非每個指令都需要SM0.0。在其它場合,要用可控制的觸點來觸發(fā)指令,如I0.0、M0.0或各種比較指令等等。如果沒有可控觸點可用,就只能用SM0.0。
a、S7200編程中有規(guī)定,在輸出類指令前必須有觸點指令,有的時候輸出指令不需要條件直接輸出為1,但為了滿足這樣的編程約定就串連常為1的sm0.0在前面。
b、不同PLC廠家都有自己語法規(guī)定,SIEMENSS7-200梯形圖就這樣要求的,不能母線直接連輸出指令(或子程序調(diào)用)。
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