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5.7牢靠操控
為使PLC能牢靠作業(yè)，在硬件與軟件兩個(gè)方面PLC廠家都采納了許多辦法，對(duì)一些特別牢靠請(qǐng)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(shí)已作了敘說(shuō)。牢靠辦法的意圖是添加PLC均勻毛病間隔時(shí)刻、MTBF（MeanTimeBetweenFailure）及削減PLC的均勻修正時(shí)刻、MTTR（MeanTimeToRepair），以行進(jìn)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(shí)刻
MTTR--均勻修正時(shí)刻
當(dāng)然，A值越大越好，它可使PLC體系得到充沛的運(yùn)用，是為啥要運(yùn)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(jìn)MTBF及MTTR值進(jìn)行的。

KEBA AR-181
KEBA CU312/E
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PILLAR INDUSTRIES AB7006-1
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POLYSPEDE PRD2-200
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POWER-ONE MAP55-1024
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RELIANCE 0-51378-25
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