Bently Nevada 125840-01
工業(yè)生產(chǎn)對(duì)控制設(shè)備的可靠性要求：
①平均故障間隔時(shí)間長(zhǎng)
②故障修復(fù)時(shí)間（平均修復(fù)時(shí)間）短
任何電子設(shè)備產(chǎn)生的故障，通常為兩種：
①偶發(fā)性故障。由于外界惡劣環(huán)境如電磁干擾、超高溫、超低溫、過(guò)電壓、欠電壓、振動(dòng)等引起的故障。這類(lèi)故障，只要不引起系統(tǒng)部件的損壞，一旦環(huán)境條件恢復(fù)正常，系統(tǒng)也隨之恢復(fù)正常。但對(duì)PLC而言，受外界影響后，內(nèi)部存儲(chǔ)的信息可能被破壞。
②*性故障。由于元器件不可恢復(fù)的破壞而引起的故障。
如果能限制偶發(fā)性故障的發(fā)生條件，如果能使PLC在惡劣環(huán)境中不受影響或能把影響的后果限制在zui小范圍，使PLC在惡劣條件消失后自動(dòng)恢復(fù)正常，這樣就能提高平均故障間隔時(shí)間；如果能在PLC上增加一些診斷措施和適當(dāng)?shù)谋Ｗo(hù)手段，在*性故障出現(xiàn)時(shí)，能很快查出故障發(fā)生點(diǎn)，并將故障限制在局部，就能降低PLC的平均修復(fù)時(shí)間。為此，各PLC的生產(chǎn)廠(chǎng)商在硬件和軟件方面采取了多種措施，使PLC除了本身具有較強(qiáng)的自診斷能力，能及時(shí)給出出錯(cuò)信息，停止運(yùn)行等待修復(fù)外，還使PLC具有了很強(qiáng)的抗*力。
廈門(mén)莫格電氣自動(dòng)化有限公司
：張美霞
電 話(huà)：/
傳 真：
地 址: 廈門(mén)市思明區(qū)檳榔西里197號(hào)第四層B19單元
http://www.mogget。。ｃｎ/
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DEZURIK CYLINDER ACTUATOR 941816R001 44482
HOWA ROTATING HYDRAULIC CHUCK CYLINDER HH11C 80
PMV 800kPA ELECTRO-PNEUMAT?IC DOUBLE ACTING VALVE POSITIonER P-2020 NIB
WHITEY 200PSI MAX 90 PNEUMATIC SPRING RETURN ACTUATOR 133 SR W/ MB-133
CMT 80 PSI, 2.5" STROKE DOUBLE ACTING IMPACT MARKER 288SUBK.OB.25.R
YUKEN CYLINDER CJT70-TC40B320B?-ABA-EK 20A
PARKER SCHRADER BELLOWS 24 VDC SOLENOID PNEUMATIC VALVE W2154L579B
YUKEN HYDRAULIC CYLINDER CJT70-FA32B325B?-BCB-EK 20A
FESTO PNEUMATIC CYLINDER DZH-50-200PPV-A
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PARKER JIC P 16 SS FLUID ConNECTING NUT, LOT OF 17
HYDRAULIC THREAD NUT HMV 134/A-101
NUMATICS 150 PSIG SOLENOID VALVE I24SS415K
NUMATICS 110/120V .37A 150 PSIG-AIR SOLENOID VALVE W/ base, 554SA43AK000030
