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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(diǎn)，適用于無條件觸發(fā)的場(chǎng)合，并非每個(gè)指令都需要SM0.0。在其它場(chǎng)合，要用可控制的觸點(diǎn)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(diǎn)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(diǎn)指令，有的時(shí)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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