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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(jìn)PLC的有用度A（Availability）。
A=MTBF/(MTBF+MTTR)
式中A--有用率
MTBF--均勻毛病間隔時刻
MTTR--均勻修正時刻
當(dāng)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(jìn)MTBF及MTTR值進(jìn)行的。

KEBA AR-181
KEBA CU312/E
KEBA CU313
KEBA CU313
KEBA CU313A
KEBA DI325
KEBA DI325
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KEBA DO321
KEBA DO321
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KENSINGTON WFH4C
KEPCO 4882-27
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KEYENCE ML-P2
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MOTOROLA MVME5100
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MTL 2213
MYKROLIS FC-280SAV
NACHI BUY222
NAICH AUX111
NATIONAL INSTRUMENTS SCXI-1163R
NATIONALA MM-4M-R
Natural?MicroSystems?NMS CG6500C 8E1/8T1 背板
NEC 136-551733-B-02
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NEC 136-553623-A-01
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oxboro E69F-BI2-MS
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PHOENIX QUINT PS-100-240AC/24DC/10
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PHOENIX UT 6-HE SI
PHOENIX IBS PCI SC/I-T
PILLAR INDUSTRIES AB7006-1
PILZ P1U-1NB
PILZ PZE3 V22 24VDC
PIONEER MAGNETICS PM1253AL-6-3-Z03
POLYSPEDE PRD2-200
POTTER&BRUMFIELD SDAS-01-7Y2S1024
POWER-ONE MAP55-1024
PROSOFT 1454-9F
PROSOFT 5601-RIO-MCM
Prosoft MVI56E-MCMR
PROSOFT MVI56-GSC
PROSOFT MVI69-PDPMV1
PROTECH SYSTEMS PBI-6SA
PRT PSA300R-81
PRT PSA300R-PFC
RADISYS EPC-16
RADISYS EPC-5 w/ EXM-13
RADISYS EXP-MX200
RELIANCE 0-51378-25
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