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wangkeming
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樓主  發(fā)表于: 2011-07-15 02:08
小弟學(xué)習三菱PLC也有段時(shí)間了。但是上升沿和下升沿到底怎么理解還是不夠透徹。特別是在運用上不知道是在什么場(chǎng)合用上升沿還是下升沿。我真的很頭疼啊。不知道你們有什么好的理解嗎？謝謝了。
xf_lyj
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1樓  發(fā)表于: 2011-08-04 22:59
上升沿：也叫上跳沿，比如從地上跳到床上的動(dòng)作行為。上床后的所作所為與時(shí)間不關(guān)心。
下降沿：也叫下跳沿，比如從床上跳到地上的動(dòng)作行為。下床后跑哪去了、跑了多久也不關(guān)心。
這樣好理解了吧。

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