HMI是人機界面的簡寫，它為PLC控制系統(tǒng)、I/O或者其他控制系統(tǒng)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(xié)議與這些控制系統(tǒng)交互數(shù)據(jù)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(xiàn)了下面的關鍵功能：
1、實時監(jiān)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(fā)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(shù)據(jù)的能力，這需要HMI集成各種型號的PLC、I/O、各種總線協(xié)議等自控設備的通信協(xié)議;
2. 人機界面(HMI)應該提供一個工具軟件，供客戶開發(fā)基于特定控制系統(tǒng)定制相應的應用;
3. 人機界面(HMI)必須是工業(yè)的產(chǎn)品，能夠適應工業(yè)應用環(huán)境，具有可靠的質(zhì)量和的性能。
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