A06B-6130-K204

A06B-6130-K204

總之，為了用好PLC，PLC的支撐軟件越來越豐厚，功用也越來越好，其界面也越來越友愛，也因此，它的狀況怎么，已變成評判PLC功用的方針之一。
5.7牢靠操控
為使PLC能牢靠作業(yè)，在硬件與軟件兩個方面PLC廠家都采納了許多辦法，對一些特別牢靠請求的PLC，還有相應(yīng)的特別的辦法，如熱備、冗余等等。這在介紹PLC的特色時已作了敘說。牢靠辦法的意圖是添加PLC均勻毛病間隔時刻、MTBF（MeanTimeBetweenFailure）及削減PLC的均勻修正時刻、MTTR（MeanTimeToRepair），以行進PLC的有用度A（Availability）。
A=MTBF/(MTBF+MTTR)
式中A--有用率
MTBF--均勻毛病間隔時刻
MTTR--均勻修正時刻
當然，A值越大越好，它可使PLC體系得到充沛的運用，是為啥要運用PLC的首要方針。而從上式可知，MTBF越大，MTTR越小，則A越大。所以，PLC的牢靠辦法都是環(huán)繞行進MTBF及MTTR值進行的。
鑒于牢靠作業(yè)是PLC的首要特色，至關(guān)首要，故有關(guān)行進MTBF及下降MTTR的辦法怎么，以及PLC的MTBF與MTTR值也變成PLC功用的首要方針。
5.8經(jīng)濟方針
以上七條講的都是PLC的技能功用。本來，運用PLC，還要思考經(jīng)濟方針。經(jīng)濟是根底，經(jīng)濟上不合算，不能帶來經(jīng)濟效益，運用PLC也就沒有根底。所以，這個方針也是首要的。經(jīng)濟方針最簡略的即是看報價。通常講，一樣技能功用的PLC，報價低其經(jīng)濟方針就好
此外，還要看供貨狀況，供貨不及時，影響運用，報價即便低，也不必定就好；看技能效勞，材料不全，用戶呈現(xiàn)疑問得不到技能支撐也欠好。

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