405-4DAC西門子
405-4DAC西門子
相對(duì)于PLC系統(tǒng)來(lái)說(shuō)，DCS通常更加昂貴，而且與今天面臨的狀況不同，當(dāng)年很多工廠對(duì)生產(chǎn)速度、產(chǎn)量、廢物排放、安全性和遵循法規(guī)上的需求并不高。正是因?yàn)檫@樣，基于PLC的系統(tǒng)才獲得了發(fā)展，因?yàn)樗鼈兡軌蛱峁└偷墓潭ㄙY產(chǎn)投資，同時(shí)提供的功能也足夠用。但是隨著時(shí)代的變遷，在市場(chǎng)范圍DCS系統(tǒng)的價(jià)格不斷降低，制造企業(yè)對(duì)其需求也隨之上升。因此，在投建新自動(dòng)化項(xiàng)目時(shí)，很多控制系統(tǒng)工程師、維護(hù)和工廠開始重新審視DCS和PLC控制系統(tǒng)兩者的優(yōu)劣。
過(guò)去國(guó)內(nèi)的自動(dòng)化設(shè)備廠商，仿造德系、日系、臺(tái)系等品牌的PLC、變頻器、伺服產(chǎn)品，盡管價(jià)格較低，但是質(zhì)量工藝并未達(dá)到標(biāo)準(zhǔn)，產(chǎn)品使用周期較短，造成了用戶對(duì)國(guó)產(chǎn)品牌產(chǎn)品較差的印象。
以變頻器生產(chǎn)為例，與許多產(chǎn)業(yè)一樣，變頻器行業(yè)zui先起步主要依靠模仿國(guó)外產(chǎn)品技術(shù)起步。但是，與歐美、日本等工業(yè)化國(guó)家已經(jīng)擁有了比較成熟的變頻器技術(shù)和相關(guān)產(chǎn)業(yè)相比，國(guó)內(nèi)技術(shù)難以抗衡。變頻器國(guó)產(chǎn)化成為了無(wú)數(shù)中國(guó)工控人畢生奮斗的目標(biāo)，在變頻器國(guó)產(chǎn)化征程上，涌現(xiàn)了很多的傳奇人物和無(wú)數(shù)的傳奇企業(yè)。如：普傳、英威騰、四方、利德華福、阿爾法等企業(yè)，如今國(guó)內(nèi)變頻器廠商在走向，不少國(guó)產(chǎn)品牌的崛起*可與品牌廠商抗衡。
經(jīng)濟(jì)型CPU 224特點(diǎn)：
集成14輸入/10輸出共24個(gè)數(shù)字量I/O點(diǎn)；
可連接7個(gè)擴(kuò)展模塊，zui大擴(kuò)展至256路數(shù)字量I/O點(diǎn)或32路模擬量；
24K字節(jié)程序和10K數(shù)據(jù)存儲(chǔ)空間；
數(shù)據(jù)存儲(chǔ)器掉電可保五年；
布爾量運(yùn)算執(zhí)行時(shí)間0.15us；
2個(gè)RS485通訊/編程口，具有PPI /自由口通訊能力。
支持軟件中的所有向?qū)Чδ堋?/p>
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