PLC作用：
PLC是多數工業控制和工廠自動化系統的核心組成部分，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、系統穩定性以及與連接的自動化系統的互操作性。
現在工業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)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。
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，幾乎所有工業行業都需要用到它。
2、用于模擬量控制
模擬量，如電流、電壓、溫度、壓力等等，它的大小是連續變化的。工業生產，特別是連續型生產過程，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技術的發展，其數據存儲區越來越大。PLC還可配置上小型打印機，定期把DM區的數據打出來。PLC也可與計算機通訊，由計算機把DM區的數據讀出，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、用于信號監控
PLC自檢信號很多，內部器件也很多，多數使用者未充分發揮其作用。其實，*可利用它進行PLC自身工作的監控，或對控制對象進行監控。
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