描述

1747-L553

我們已經(jīng)知道有的FCS是由PLC發(fā)展而來(lái)，而有的FCS是由DCS發(fā)展而來(lái)，那么，今天FCS已走向?qū)嵱没琍LC與DCS前景又將如何。
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)。可以滿足火電廠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。

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
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