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廈門鈦霓電氣有先公司
主營產(chǎn)品: 電工電氣,工控設(shè)備,PLC |
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![]() |
廈門鈦霓電氣有先公司
主營產(chǎn)品: 電工電氣,工控設(shè)備,PLC |
暫無信息 |
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更新時(shí)間:2018-06-01 20:45:47瀏覽次數(shù):165
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1336-BDBMX3-SP62A
1336-BDBMX3-SP62A
.7可靠控制
為使PLC能可靠工作,在硬件與軟件兩個(gè)方面PLC廠家都采取了很多措施,對一些特殊可靠要求的PLC,還有相應(yīng)的特殊的措施,如熱備、冗余等等。這在介紹PLC的特點(diǎn)時(shí)已作了敘述。可靠措施的目的是增加PLC平均故障間隔時(shí)間、MTBF(MeanTimeBetweenFailure)及減少PLC的平均修復(fù)時(shí)間、MTTR(MeanTimeToRepair),以提高PLC的有效度A(Availability)。
A=MTBF/(MTBF+MTTR)
式中A--有效率
MTBF--平均故障間隔時(shí)間
MTTR--平均修復(fù)時(shí)間
當(dāng)然,A值越大越好,它可使PLC系統(tǒng)得到充分的利用,是為什么要使用PLC的重要指標(biāo)。而從上式可知,MTBF越大,MTTR越小,則A越大。所以,PLC的可靠措施都是圍繞提高MTBF及MTTR值進(jìn)行的。
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備貨,備貨,降降降,火火火,火火火……
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