GE IC697MDL341
咨詢熱線--17750626260
界上公認(rèn)的臺(tái)PLC是1969年美國數(shù)字設(shè)備公司(DEC)研制的。限于當(dāng)時(shí)的元器件條件及計(jì)算機(jī)發(fā)展水平,早期的PLC主要由分立元件和中小規(guī)模集成電路組成,可以完成簡單的邏輯控制及定時(shí)、計(jì)數(shù)功能。20世紀(jì)70年代初出現(xiàn)了微處理器。人們很快將其引入可編程控制器,使PLC增加了運(yùn)算、數(shù)據(jù)傳送及處理等功能,完成了真正具有計(jì)算機(jī)特征的工業(yè)控制裝置。為了方便熟悉繼電器、接觸器系統(tǒng)的工程技術(shù)人員使用,可編程控制器采用和繼電器電路圖類似的梯形圖作為主要編程語言,并將參加運(yùn)算及處理的計(jì)算機(jī)存儲(chǔ)元件都以繼電器命名。此時(shí)的PLC為微機(jī)技術(shù)和繼電器常規(guī)控制概念相結(jié)合的產(chǎn)物。
20世紀(jì)70年代中末期,可編程控制器進(jìn)入實(shí)用化發(fā)展階段,計(jì)算機(jī)技術(shù)已全面引入可編程控制器中,使其功能發(fā)生了飛躍。更高的運(yùn)算速度、超小型體積、更可靠的工業(yè)抗干擾設(shè)計(jì)、模擬量運(yùn)算、PID功能及極高的性價(jià)比奠定了它在現(xiàn)代工業(yè)中的地位。20世紀(jì)80年代初,可編程控制器在先進(jìn)工業(yè)國家中已獲得廣泛應(yīng)用。這個(gè)時(shí)期可編程控制器發(fā)展的特點(diǎn)是大規(guī)模、高速度、高性能、產(chǎn)品系列化。這個(gè)階段的另一個(gè)特點(diǎn)是上生產(chǎn)可編程控制器的國家日益增多,產(chǎn)量日益上升。這標(biāo)志著可編程控制器已步入成熟階段。
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廈門莫格電氣自動(dòng)化有限公司
聯(lián)系人:張芳(銷售工程師)
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OMRON POWER SUPPLY S82J-15024D1 NNB
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ALLEN BRADLEY RELAY 700-HB32A1-3-4 NIB
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ACOPIAN 250V 3/8A POWER SUPPLY W/ BRACKET, B12TN100
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ALLEN BRADLEY MEMORY MODULE 1772-ME S/REV A
SIEMENS C25 400V-440V 3 POLE CIRCUIT BREAKER 5 SX23
TOSHIBA 5K TRANSISTOR MODULE MG15N6EK1
POWERVOLT 5VDC 3A DC POWER SUPPLY BVA-5AS3/OVP
WESTINGHOUSE NR SIZE #4 110V. CONTACTOR 60CY 1596633
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HUBBELL 125V 15A 2P 3W DUPLEX RECEPTACLES, CR5252 *NEW LOT OF 5*
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TOSHIBA 5E MODULE MG30G1BL2
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CROUSE-HIND RECEPTACLE AR642 MODEL M3, 60AMP 3 WIRE 4 POLE, NNB
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