描述
BENTLY-167699-02
PLC于60年代末期在美國(guó)首先出現(xiàn),目的是用來(lái)取代繼電器,執(zhí)行邏輯、計(jì)時(shí)、計(jì)數(shù)等順序控制功能,建立柔性程序控制系統(tǒng)。1976年正式命名,并給予定義:PLC是一種數(shù)字控制專(zhuān)用電子計(jì)算機(jī),它使用了可編程序存儲(chǔ)器儲(chǔ)存指令,執(zhí)行諸如邏輯、順序、計(jì)時(shí)、計(jì)數(shù)與演算等功能,并通過(guò)模擬和數(shù)字輸入、輸出等組件,控制各種機(jī)械或工作程序。經(jīng)過(guò)30多年的發(fā)展,PLC已十分成熟與完善,并開(kāi)發(fā)了模擬量閉環(huán)控制功能。PLC在FCS系統(tǒng)中的地位似乎已被確定并無(wú)多少爭(zhēng)論。IEC推薦的現(xiàn)場(chǎng)總線控制系統(tǒng)體系結(jié)構(gòu),PLC作為一個(gè)站掛在高速總線上。編者以為,輔助車(chē)間的控制系統(tǒng)應(yīng)以遵循現(xiàn)場(chǎng)總線通訊協(xié)議的PLC或能與FCS進(jìn)行通訊交換信息的PLC為優(yōu)選對(duì)象。自1973年提出第一臺(tái)以微處理器為基礎(chǔ)的控制器以來(lái),它逐步完善,并最終形成功能齊全、安全可*的數(shù)字式分散控制系統(tǒng)DCS。它的性能大大優(yōu)于以住任何一種控制系統(tǒng)??梢詽M足火電廠DAS、MCS、SCS和APS各系統(tǒng)的各種要求,目前還可以通過(guò)工業(yè)以太網(wǎng)建立管理層網(wǎng)絡(luò),以滿足火電廠呼聲越來(lái)越高的加強(qiáng)管理的要求??梢赃@樣說(shuō),DCS系統(tǒng)的監(jiān)控可以復(fù)蓋大型火電機(jī)組的工藝全過(guò)程。
但是,自從有了FCS,并于90年代走向?qū)嵱没詠?lái),不斷有如下論點(diǎn)在公開(kāi)刊物上發(fā)表,即:“從現(xiàn)在起,新的現(xiàn)場(chǎng)總線控制系統(tǒng)FCS將逐步取代傳統(tǒng)的DCS”;“當(dāng)調(diào)節(jié)功能下放到現(xiàn)場(chǎng)去以后,傳統(tǒng)的DCS就沒(méi)有存在的必要而會(huì)自動(dòng)消失”;“今后十年,傳統(tǒng)的4~20mA模擬信號(hào)制將逐步被雙向數(shù)字通信現(xiàn)場(chǎng)總線信號(hào)制所取代,模擬與數(shù)字的分散型控制系統(tǒng)DCS將更新?lián)Q代為全數(shù)字現(xiàn)場(chǎng)總線控制系統(tǒng)FCS”……。這些論點(diǎn)歸納為一句話:FCS將取代DCS,DCS從此將消亡。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門(mén)子,摩托羅拉,安川。力士樂(lè)。ACSO,橫河等進(jìn)口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
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Fanuc Drive Board OPT3 A16B-2200-0941
Fanuc Drive Board OPT2 A16B-2200-0931 /03A
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Siemens Servomotor 1FT5044-1AF71-4?EA0 + ROD 426
Bosch Rexroth Servodyn KM 3300-T 054915-106 KM3300
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Siemens Simodrive 610 Leistungsteil 20A 6SC6120-0FE01
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Bosch Servo Drive Modul DM 15K1101-D DM 15K-1101-D
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Siemens Sinumerik 6FX1125-1AA01 + 2 x 570515.9001.00
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Siemens Simatic S5 6ES5308-3UC11 6ES5-308-3UC11 V.9
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