3BSE004191R1張力傳感器,3BSE004191R1使用參數(shù)
電磁干擾源及對(duì)系統(tǒng)的干擾
1干擾源及干擾一般分類(lèi)
影響DCS控制系統(tǒng)的干擾源與一般影響工業(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。3BSE004191R1張力傳感器
干擾類(lèi)型通常按干擾產(chǎn)生的原因、噪聲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;
按噪聲干擾模式不同,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(lèi)方法。共模干擾是信號(hào)對(duì)地的電位差,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)電壓迭加所形成。共模電壓有時(shí)較大,特別是采用隔離性能差的配電器供電室,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(guò)不對(duì)稱(chēng)電路可轉(zhuǎn)換成差模電壓,直接影響測(cè)控信號(hào),造成元器件損壞(這就是一些系統(tǒng)I/O模件損壞率較高的主要原因),這種共模干擾可為直流、亦可為交流。差模干擾是指作用于信號(hào)兩極間的干擾電壓,主要由空間電磁場(chǎng)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,這種直接疊加在信號(hào)上,直接影響測(cè)量與控制精度。
2 DCS控制系統(tǒng)中電磁干擾的主要來(lái)源
2.1來(lái)自空間的輻射干擾3BSE004191R1張力傳感器,3BSE004191R1使用參數(shù)
空間的輻射電磁場(chǎng)(EMI)主要是由電力網(wǎng)絡(luò)、電氣設(shè)備的暫態(tài)過(guò)程、雷電、無(wú)線電廣播、電視、雷達(dá)、高頻感應(yīng)加熱設(shè)備等產(chǎn)生的,通常稱(chēng)為輻射干擾,其分布極為復(fù)雜。若DCS系統(tǒng)置于所射頻場(chǎng)內(nèi),就回收到輻射干擾,其影響主要通過(guò)兩條路徑:一是直接對(duì)DCS內(nèi)部的輻射,由電路感應(yīng)產(chǎn)生干擾;而是對(duì)DCS通信內(nèi)網(wǎng)絡(luò)的輻射,由通信線路的感應(yīng)引入干擾。
act; The stepper motor control starts to move downward, while the other stepper motor control horizontal axis starts to move forward; The servo motor drives the manipulator to rotate to the position where it just grabs the goods, then inflates, and the manipulator clamps the goods.
The stepper motor drives the vertical axis to rise, and the other stepper motor drives the horizontal axis to move forward; The DC motor of the rotary table rotates to make the manipulator move as a whole and turn to the goods receiving place; The stepper motor drives the longitudinal shaft down again. After reaching the specified position, the air valve deflates and the manipulator releases the goods; The system returns to its position for the next action. Background of PAC control technology
Since the 1970s, PLC replaced the original relay control system, it has been widely used in various control systems and become a highly competitive control tool in the field of automation.