HMI是人機界面的簡寫，它為PLC控制系統、I/O或者其他控制系統提供一個人性化的操作界面，而人機界面則通過RS232、485、MODBUS、CAN總線等協議與這些控制系統交互數據與控制信號。由于這種交互是實時的，這就使得HMI(人機界面)實現了下面的關鍵功能：
1、實時監控PLC、I/O的運行，并在HMI上形象地顯示出來;
2、操作者可以通過HMI向自動化設備發出控制信號，使得自動化設備可以按照操縱者的意圖運行。
人機界面(HMI)的應用域決定了它必須具備下列特性：
1. 人機界面(HMI)必須具備和各種自控設備交互數據的能力，這需要HMI集成各種型號的PLC、I/O、各種總線協議等自控設備的通信協議;
2. 人機界面(HMI)應該提供一個工具軟件，供客戶開發基于特定控制系統定制相應的應用;
3. 人機界面(HMI)必須是工業的產品，能夠適應工業應用環境，具有可靠的質量和的性能。
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