PLC作用：
PLC是多數工業(yè)控制和工廠自動化系統(tǒng)的核心組成部分，通常被稱為工廠的“大腦"，PLC 通過接收和處理來自傳感器和機器的數據來實現廣泛的功能，然后使用這些數據來控制和制動外部設備。除此之外，成功的設計必須具備可靠性、系統(tǒng)穩(wěn)定性以及與連接的自動化系統(tǒng)的互操作性。
現在工業(yè)上使用可編程邏輯控制器已經相當接近于一臺輕巧型計算機，甚至已經出現集成個人計算機(采用嵌入式操作系統(tǒng))與PLC結合架構的可編程自動化控制器(Programmable Automation Controller，簡稱PAC)，能透過數字或模擬輸入/輸出控制機器設備、制造處理流程及其他控制的電子系統(tǒng)。
1、用于開關量控制
目前，PLC的首要目標，也是別的控制器無法與其比擬的，就是它能方便并可靠地用于開關量的控制。用PLC進行開關量控制實例是很多的，冶金、機械、輕工、、紡織等等，幾乎所有工業(yè)行業(yè)都需要用到它。
2、用于模擬量控制
模擬量，如電流、電壓、溫度、壓力等等，它的大小是連續(xù)變化的。工業(yè)生產，特別是連續(xù)型生產過程，常要對這些物理量進行控制。用PLC實現模擬量控制是*可能的。
PLC進行模擬量控制，要配置有模擬量與數字量相互轉換的A/D、D/A單元。它也是I/O單元，不過是特殊的I/O單元。
3、用于運動控制
實際的物理量，除了開關量、模擬量，還有運動控制。PLC可接收計數脈沖，加上PLC有數據處理及運算能力，若再配備相應的傳感器(如旋轉編碼器)或脈沖伺服裝置，則*可以依NC的原理實現種種控制。
4、用于數據采集
隨著PLC技術的發(fā)展，其數據存儲區(qū)越來越大。PLC還可配置上小型打印機，定期把DM區(qū)的數據打出來。PLC也可與計算機通訊，由計算機把DM區(qū)的數據讀出，并由計算機再對這些數據作處理。這時，PLC即成為計算機的數據終端。
5、用于信號監(jiān)控
PLC自檢信號很多，內部器件也很多，多數使用者未充分發(fā)揮其作用。其實，*可利用它進行PLC自身工作的監(jiān)控，或對控制對象進行監(jiān)控。
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