XVME-400
1.概述
隨著科學(xué)技術(shù)的發(fā)展，PLC在工業(yè)控制中的應(yīng)用越來越廣泛。PLC控制系統(tǒng)的可靠性直接影響到工業(yè)企業(yè)的安全生產(chǎn)和經(jīng)濟(jì)運(yùn)行，系統(tǒng)的抗干擾能力是關(guān)系到整個(gè)系統(tǒng)可靠運(yùn)行的關(guān)鍵。自動(dòng)化系統(tǒng)中所使用的各種類型PLC，有的是集中安裝在控制室，有的是安裝在生產(chǎn)現(xiàn)場和各電機(jī)設(shè)備上，它們大多處在強(qiáng)電電路和強(qiáng)電設(shè)備所形成的惡劣電磁環(huán)境中。要提高PLC控制系統(tǒng)可靠性，設(shè)計(jì)人員只有預(yù)先了解各種干擾才能有效保證系統(tǒng)可靠運(yùn)行。
2.電磁干擾源及對(duì)系統(tǒng)的干擾是什么？
影響PLC控制系統(tǒng)的干擾源于一般影響工業(yè)控制設(shè)備的干擾源一樣，大都產(chǎn)生在電流或電壓劇烈變化的部位，這些電荷劇烈移動(dòng)的部位就是噪聲源，即干擾源。
干擾類型通常按干擾產(chǎn)生的原因、噪聲的干擾模式和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、浪涌噪聲、高頻振蕩噪聲等；按噪聲的波形、性質(zhì)不同，分為持續(xù)噪聲、偶發(fā)噪聲等；按聲音干擾模式不同，分為共模干擾和差模干擾。共模干擾和差模干擾是一種比較常用的分類方法。共模干擾是信號(hào)對(duì)地面的電位差，主要由電網(wǎng)串入、地電位差及空間電磁輻射在信號(hào)線上感應(yīng)的共態(tài)（同方向）電壓送加所形成。共模電壓有時(shí)較大，特別是采用隔離性能差的電器供電室，變送器輸出信號(hào)的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過不對(duì)稱電路可轉(zhuǎn)換成差模電壓，直接影響測控信號(hào)，造成元器件損壞（這就是一些系統(tǒng)I/O模件損壞率較高的原因），這種共模干擾可為直流、亦可為交流。差模干擾是指用于信號(hào)兩極間得干擾電壓，主要由空間電磁場在信號(hào)間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模干擾所形成的電壓，這種讓直接疊加在信號(hào)上，直接影響測量與控制精度。
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6AR1303-0AF00-0AA0 [12 MONTHS WARRANTY]
2 931 39
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6AR1303-0AA01-0AA0 [12 MONTHS WARRANTY]
2 931 39
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SL3000-0BE21-0AA0 [12 MONTHS WARRANTY]
2 931 39
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SL3546-0FB21-1PA0 [12 MONTHS WARRANTY]
2 947 99
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6AG1331-7KF02-2AB0 [12 MONTHS WARRANTY]
3 496 13
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 3RK1325-6KS71-2AA5 [12 MONTHS WARRANTY]
2 308 61
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE ABB CPU86-NDP [12 MONTHS WARRANTY]
6 560 42
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 505-2557 [12 MONTHS WARRANTY]
4 608 85
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 7KM4212-0BA00-3AA0 [12 MONTHS WARRANTY]
2 798 56
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SL3210-1KE21-7AP0 [12 MONTHS WARRANTY]
3 786 76
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens C98043-A1210-L21 [12 MONTHS WARRANTY]
3 703 75
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES7972-0AB01-0XA0 [12 MONTHS WARRANTY]
2 582 64
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES7355-1VH10-0AE0 [12 MONTHS WARRANTY]
3 188 81
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES5095-8MA05 [12 MONTHS WARRANTY]
3 006 18
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6RB2100-0NA11 [12 MONTHS WARRANTY]
2 541 14
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6GK1510-0AC00 [12 MONTHS WARRANTY]
2 541 14
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE OMRON NT21-ST121B-E [12 MONTHS WARRANTY]
4 517 53
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6BK1800-5ST00-0AA0 [12 MONTHS WARRANTY]
2 433 14
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SL3000-0CE32-3AA0 [12 MONTHS WARRANTY]
3 031 08
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SE9521-8CC40 [12 MONTHS WARRANTY]
6 012 28
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES5946-3UA22 [12 MONTHS WARRANTY]
8 968 65
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES5946-3UA21 [12 MONTHS WARRANTY]
8 968 65
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SL3040-1LA00-0AA0 [12 MONTHS WARRANTY]
2 781 96
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6AV8100-0CA00-0AA1 [12 MONTHS WARRANTY]
3 404 73
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES7223-1PL22-0XA0 [12 MONTHS WARRANTY]
2 582 64
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SE6440-2AC23-0CA1 [12 MONTHS WARRANTY]
3 512 73
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6ES7341-1AH02-0AE0 [12 MONTHS WARRANTY]
3 022 78
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SN1118-1NJ01-0AA1 [12 MONTHS WARRANTY]
3 022 78
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6SN2132-1BC11-1BA1 [12 MONTHS WARRANTY]
4 750 05
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens 6DS1312-8BB [12 MONTHS WARRANTY]
5 555 54
Shipping not specified
Watch
From Czech Republic
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
SERVICE Siemens C98043-A1051-L210 [12 MONTHS WARRANTY]
4 625 45
