AB 1756-N2
為適應(yīng)工業(yè)環(huán)境使用,與一般控制裝置相比較,PLC機(jī)有以下特點(diǎn):
1. 可靠性高,抗*力強(qiáng)
工業(yè)生產(chǎn)對控制設(shè)備的可靠性要求:
①平均故障間隔時間長
②故障修復(fù)時間(平均修復(fù)時間)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、過電壓、欠電壓、振動等引起的故障。這類故障,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PLC而言,受外界影響后,內(nèi)部存儲的信息可能被破壞。
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恢復(fù)正常,這樣就能提高平均故障間隔時間;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,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)時間。為此,各PLC的生產(chǎn)廠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,能及時給出出錯信息,停止運(yùn)行等待修復(fù)外,還使PLC具有了很強(qiáng)的抗*力。
廈門莫格電氣自動化有限公司
:張 美 霞
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FARRAND 51 & 1/2" O.A.L. TAPE SPAR LINEAR SCALE 218052-15-1038
TOL-O-MATIC B3W LINEAR BELT DRIVE ACTUATOR WITH MOTOR, NNB
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36.562" O.A.L. PRECISION BALL SCREW 80198 / C-160
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42" O.A.L. PRECISION BALL SCREW C-270
48" O.A.L. PRECISION BALL SCREW A-60292
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THREAD CRAFT INC T-2569 COMMERCIAL BACKLASH BALL SCREW 38 OAL 30 TRAV NIB
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44'' LINEAR GUIDE RAIL
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THOMPSON SUPER 24 BALL BEARING LINEAR BUSHING NIB
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DAYTRonIC LINEAR SENSOR DS6000A
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CAIPO DIS 10292 35 X 30 SCREW ACTUATOR
BELOIT CORP. SCREW JACK 274817D023-0-00?5
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THREAD CRAFT INC T-6235 COMMERCIAL BACKLASH BALL SCREW 49 OAL 42 TRAV NIB
1244.5MM O.A.L. PRECISION BALL SCREW C-264
IKO 13-HOLE LINEAR GUIDE RAILWAY LWH 55 101018
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EMCOR 47.812" O.A.L. PRECISION BALL SCREW E-6630
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HEIDENHAIN 620MM, LINEAR SCALE LS 704
TEMPOSonIC R SERIES LINEAR-POSITION SENSOR RHT0065UD601V01
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IDEAL .69-1.25D, SAE SIZE 12, CLAMP 62M12, BOX OF 10 *NEW*
AEROQUIP HOSE CUT OFF MACHINE S1104-2-1
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REX 5FT MAT TOP CHAIN LF5936-12 *NEW*