描述

1C31194G03

70年代是PLC崛起，首先在汽車工業(yè)獲得大量應(yīng)用，在其它產(chǎn)業(yè)部門也開(kāi)始應(yīng)用的時(shí)期。80年代是它走向成熟，全面采用微電子及微處理器技術(shù)；大量推廣應(yīng)用，并奠定其在工業(yè)控制中不可動(dòng)搖地位的時(shí)期。在此階段PLC銷售始終以兩位數(shù)百分點(diǎn)的速度增長(zhǎng)，前六年的增長(zhǎng)率超過(guò)35%，后四年穩(wěn)定發(fā)展，年增長(zhǎng)率約12%。90年代又開(kāi)始了它的第三個(gè)發(fā)展時(shí)期。隨著PLC的國(guó)際標(biāo)準(zhǔn)IEC 61131的正式頒布，推動(dòng)了PLC在技術(shù)上發(fā)動(dòng)新的突破：在系統(tǒng)體系結(jié)構(gòu)上，從傳統(tǒng)的單機(jī)向多CPU和分布式及遠(yuǎn)程控制系統(tǒng)發(fā)展；在編程語(yǔ)言上，文本化和圖形化的語(yǔ)言多樣性，創(chuàng)造了更具表達(dá)控制要求、文字處理、通信能力的編程環(huán)境。

值得注意的是PLC和DCS這些原來(lái)處于不同硬件平臺(tái)的系統(tǒng)，正隨著計(jì)算技術(shù)、通信技術(shù)和編程技術(shù)的發(fā)展，趨向于建立同一硬件平臺(tái)，運(yùn)用同一個(gè)操作系統(tǒng)、同一個(gè)編程系統(tǒng)，執(zhí)行不同的DCS和PLC功能。這就是真正意義上的EIC三電一體化?；蛘哒f(shuō)DCS和PLC的形態(tài)將會(huì)變化，而它們的功能依然存在。其中的關(guān)鍵技術(shù)應(yīng)該是嵌入式PC系統(tǒng)及支持現(xiàn)場(chǎng)總線的I/O （硬件） ，以及以IEC 61161-3為基礎(chǔ)的編程系統(tǒng)及強(qiáng)實(shí)時(shí)(hard real-time)操作系統(tǒng)。

ILX Lightwave LDC-3916 16 calibrated 3916376 & 3916558

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ILX Lightwave MPS-8035 Dual Channel Fiber Optic Sources

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ILX Lightwave FOS79800-315-15?47.5 nm Precision Fiber Op

ILX Lightwave FOS79800-315-15?56.2 nm Precision Fiber Op

ILX Lightwave FOS79800D-000-1?312.00 nm Precision Fiber

ILX Lightwave FOS79800D-000 Laser Source Module 1536,23

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79800B FIBER OPTIC SOURCE ILX LIGHTWAVE

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ILX LIGHTWAVE CSM 39800 CURRENT SOURCE MODULE LDC-3900

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ILX Lightwave CSM39100 Current Source Module, 1000mA

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ILX Lightwave PDA6424 Photodiode Amplifier

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LOT THORLABS ILX LIGHTWAVE LASER OPTICAL DETECTOR HEADS

ILX Lightwave LDM4970 Laser Diode Mount 14-pin Butterfl

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ILX LIGHTWAVE LNF-320 Low Noise Filter

Brand NEW ILX LIGHTWAVE LNF-320 Low Noise CW Filter

ILX LIGHTWAVE LDT-5910 Instruction Manual, Original

ILX Lightwave FOS79800C 1554.13 nm DFB

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