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DCS体系冗余技能是计算机体系牢靠性规划中常选用的一种技能,是进步计算机体系牢靠性的有用办法之一。为了到达高牢靠性和低失功率相统一的意图,我们一般会在操控体系的规划和运用中选用冗余技能。合理的冗余规划将大大进步体系的牢靠性,可是一起也添加了体系的复杂度和规划的难度,运用冗余装备的体系还添加了用户出资。
1、冗余技能
冗余技能概要:冗余技能就是添加剩余的设备,以确保体系愈加牢靠、地作业。冗余的分类办法多种多样,依照在体系中所在的方位,冗余可分为元件级、部件级和体系级;依照冗余的程度可分为1:1冗余、1:2冗余、1:n冗余等多种。在当时元器件牢靠性不断进步的状况下,和其它方法的冗余方法比较,1:1的部件级热冗余是一种有用而又相对简略、装备灵敏的冗余技能完成方法,如I/O卡件冗余、电源冗余、主操控器冗余等。因而,目前国内外干流的进程操控体系中大多选用了这种方法。当然,在某些部分规划中也有选用元件级或多种冗余方法组合的成功典范。
操控体系冗余规划的意图:体系运转不受部分毛病的影响,并且毛病部件的保护对整个体系的功用完成没有影响,并能够完成在线保护,使毛病部件得到及时的修正。冗余规划会添加体系规划的难度,冗余装备会添加用户体系的出资,但这种出资换来了体系的牢靠性,它进步了整个用户体系的均匀无毛病时刻(MTBF),缩短了均匀毛病修正时刻(MTTR),因而,运用在重要场合的操控体系,冗余是十分必要的。
二个部件组成的并联体系(互为冗余)与单部件比较,均匀无毛病时刻是原来的1.5倍。体系的可用性目标能够用两个参数进行简略的描述,一个是均匀无毛病时刻(MTBF),另一个是均匀修正时刻(MTBR)。体系的可用性可用下式表明:
体系可用性=MTBF/(MTBF+MTBR)
当可用性到达99.999%时,体系每年中止效劳的时刻只要6分钟。
2、操控体系冗余的要害技能
冗余是一种的牢靠性规划技能,1:1热冗余也就是所谓的双重化,是其间一种有用的冗余方法,但它并不是两个部件简略的并联运转,而是需求硬件、软件、通讯等协同作业来完成。将互为冗余的两个部件构成一个有机的整体,一般包含以下多个技能要害:
1)信息同步技能
它是作业、备用部件之间完成无扰动(Bumpless)切换技能的条件,只要按操控实时性要求进行高速有用的信息同步,确保作业、备用部件步调一致地作业,才干完成冗余部件之间的无扰动切换。
在热备用作业方法下,其间一块处于作业状况(作业卡),完成体系的数据收集、运算、操控输出、网络通讯等功用;而另一块处于备用状况(备用卡),它实时盯梢作业卡的内部操控状况(即状况同步)。作业/备用卡件之间的正/负逻辑是互斥的,即一个为作业卡,另一个必定是备用卡;并且它们之间有冗余操控电路(又称作业/备用操控电路)和信息通讯电路,以协调两块卡件一起并且有序地运转,确保对外输入输出特性的同一性,即关于用户运用而言,能够以为只要一个部件。一般在规划中,作业、备用部件之间经过高速的冗余通讯通道(串行或并行)完成运转状况互检和操控状况的同步(如组态信息、输出阀位、操控参数等)。
2)毛病检测技能
为了确保体系在呈现毛病时及时将冗余部分投入作业,有必要有高准确的在线毛病检测技能,完成毛病发现、毛病定位、毛病阻隔和毛病报警。毛病检测包含电源、微处理器、数据通讯链路、数据总线及I/O状况等。其间毛病确诊包含毛病自确诊和毛病互检(作业、备用卡件之间的彼此查看)
3)毛病裁定技能和切换技能
准确及时地发现毛病后,还需求及时断定毛病的部位、剖析毛病的严峻性,依靠前文提到的冗余操控电路,对作业、备用毛病状况进行剖析、比较和裁定,以断定是否需求进行作业/备用之间的状况切换。操控权切换到冗余备用部件还有必要确保快速、、无扰动。当处于作业状况的部件呈现毛病(断电、复位、软件毛病、硬件毛病等)或许作业部件的毛病较备用部件严峻时,备用部件有必要快速地无扰动地顶替作业部件的所有操控使命,对现场操控不形成任何影响。一起要求切换时刻应为毫秒级,乃至是微秒级,这样就不会由于该部件的毛病而形成外部操控目标的失控或检测信息失效等等。别的,还需求尽快经过网络通讯或就地LED显现进行报警,告诉用户呈现毛病的部件和毛病状况,以便进行及时保护。
4)热插拔技能
为了确保容错体系具有高牢靠性,有必要尽量削减体系的均匀修正时刻MTBR。要做到这一点,在规划上应努力进步单元的独立性、可修正性、毛病可保护性。完成毛病部件的在线保护和替换也是冗余技能的重要组成部分,它是完成操控体系毛病部件快速修正技能的要害。部件的热插拔功用能够在不中止体系正常操控功用的状况下添加或替换组件,使体系平稳地运转
。
5)毛病阻隔技能
冗余规划时,有必要考虑作业、备用部件之间的毛病应该做到尽可能互不影响或影响的概率适当小(0.01%),即可以为毛病是阻隔的。这样能够确保:处于备用状况的部件发作毛病时,不会影响冗余作业部件或其他相关部件的正常运转,确保冗余的有用性。
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Allen-Bradley Motor Control 135A 150-A135NCD ! WOW !
Siemens ITE Breaker 400A 3Pole Type ET JL3F400 ! REFURB
Eurotherm 2604/VH/221/XX Temperature Control ! WOW !
Allen Bradley 1326AB-B720E-21-K7 Servo Motor 460V ! WOW
SST 5136-SD-ISA Network Interface Card ! NEW !
Motors MT380.010.2209.Z5 Servo Motor ! WOW !
Uticor 58454 PMD300 IND Workstation 115VAC ! WOW !
Ingersoll Rand DC Motor Controller 93970317 ! WOW !
Leeson 174924 AC 460V 7.5hp Motor Control ! NEW !
Keyence LS-3060R Photoelectric Laser Scan Receiver WOW!
Keyence LS-3060T Photoelectric Laser Scan Receiver WOW!
Honeywell Pneumatic Radiator Valve N.O 3/4" VP525A 1200
Eurotherm 2408I Temperature Controller Timer ! WOW !
Sorensen DCR20-25B2 Power Supply 25VDC 25 Amp ! NEW !
Telemecanique ATS48C14YU Soft Starter 140 Amp 100HP 690...
Allen Bradley 8520-CCRT Operator Panel CRT Monitor ! WO...
Siemens 6SC6112-0AA00 Simodrive Feed Access ! WOW !