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   1．向高速度、大容量方向發展

 為了提高PLC的處理能力，要求PLC具有更好的響應速度和更大的存儲容量。目前，有的PLC的掃描速度可達0.1ms/k步左右。PLC的掃描速度已成為很重要的一個性能指標。

 在存儲容量方面，有的PLC最高可達幾十兆字節。為了擴大存儲容量，有的公司已使用了磁泡存儲器或硬盤。

    2．向超大型、超小型兩個方向發展

 當前中小型PLC比較多，為了適應市場的多種需要，今后PLC要向多品種方向發展，特別是向超大型和超小型兩個方向發展。現已有I/O點數達14336點的超大型PLC，其使用32位微處理器，多CPU并行工作和大容量存儲器，功能強。

 小型PLC由整體結構向小型模塊化結構發展，使配置更加靈活，為了市場需要已開發了各種簡易、經濟的超小型微型PLC，最小配置的I/O點數為8～16點，以適應單機及小型自動控制的需要，如三菱公司α系列PLC。

    3．PLC大力開發智能模塊，加強聯網通信能力

 為滿足各種自動化控制系統的要求，近年來不斷開發出許多功能模塊，如高速計數模塊、溫度控制模塊、遠程I/O模塊、通信和人機接口模塊等。這些帶CPU和存儲器的智能I/O模塊，既擴展了PLC功能，又使用靈活方便，擴大了PLC應用范圍。

加強PLC聯網通信的能力，是PLC技術進步的潮流。PLC的聯網通信有兩類：一類是PLC之間聯網通信，各PLC生產廠家都有自己的專有聯網手段；另一類是PLC與計算機之間的聯網通信，一般PLC都有專用通信模塊與計算機通信。為了加強聯網通信能力，PLC生產廠家之間也在協商制訂通用的通信標準，以構成更大的網絡系統，PLC已成為集散控制系統（DCS）不可缺少的重要組成部分。

     4．增強外部故障的檢測與處理能力

     根據統計資料表明：在PLC控制系統的故障中，CPU占5%，I/O接口占15%，輸入設備占45%，輸出設備占30%，線路占5%。前二項共20%故障屬于PLC的內部故障，它可通過PLC本身的軟、硬件實現檢測、處理；而其余80%的故障屬于PLC的外部故障。因此，PLC生產廠家都致力于研制、發展用于檢測外部故障的專用智能模塊，進一步提高系統的可靠性。

    5．編程語言多樣化

  在PLC系統結構不斷發展的同時，PLC的編程語言也越來越豐富，功能也不斷提高。除了大多數PLC使用的梯形圖語言外，為了適應各種控制要求，出現了面向順序控制的步進編程語言、面向過程控制的流程圖語言、與計算機兼容的高級語言（BASIC、C語言等）等。多種編程語言的并存、互補與發展是PLC進步的一種趨勢。

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Emerson LD320EM2 A1AFP011 LCD Digital Main CBA Board Unit Motherboard

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Emerson LE220EM3 (BA21N0G0401 2) Main Board

Emerson LE220EM3 Cable Ribbon (Main Board to IR Sensor / Keyboard)

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Emerson LE220EM3 Digital Main Board (BA21N0G0401 1) A2171MMA-001

Emerson LE220EM3 Digital Main Board BA21N0G0401 1, U9001UZ, U9001UT

Emerson LE220EM3 IR Sensor Board BA21N0G0203 2

Emerson LE220EM3 IR Sensor Board Cable

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Emerson LE290EM4 LED Light Board Assembly UDULEDWPC007

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EMERSON LE290EM4 Power and Main Board Set BA31M0F0102 4 BAFUG0201 1

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Emerson LE290EM4 Power Supply Board to Main Board Flat Flexible Cable Ribbon

Emerson LE290EM4F LE290EM4 Digital Main Board (BA31MOG0201 1) A31M0MMA-003

Emerson LE290EM4F LVDS Cable Ribbon (Main Board to Panel)

Emerson LE290EM4F Power Supply Board To Main Board Cable

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Emerson LF320EM4 32ME303V/F7 A S/N ME3 Main Board / Power Supply BA4AFSG0201 1

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Emerson LF320EM4 A BA4AFCG0201 2 LED LCD Main Power Supply Board Unit

Emerson LF320EM4 A BA4AFCG0201 2 LED LCD Main Power Supply Board.

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Emerson LF320EM4 A ME2 Main / Power Board (BA4AFCG0201 2) A4AFCMMA-001

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Emerson LF320EM4 LF320EM4F Digital Main Board A3AFCMMA A3AF012 BA31MOG0201

EMERSON LF320EM4 MAIN BOARD / POWER SUPPLY (A4AFSMMA-001)

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Emerson LF320EM4 ME5 BA3AFUG0201 1 V.2 Digital Main Video Board Motherboard

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EMERSON LF320EM4A POWER /MAIN BOARD A4AF0-MMA A4AF0UH BA4AF0G0201 2

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