咨詢熱線--17750626260
PLC的各種功能主要是通過運行控制程序來實現。編制程序時,需要合理使用PLC提供的編程元件(即軟元件)。FPO型PLC中常用的編程元件有兩種:位元件(bit)和字元件(word)。位元件實際上是PLC內存區域所提供的一個二進制位單元,又被稱為軟繼電器,主要用作基本順序指令的編程元件,如輸入繼電器Xn、輸出繼電器Yn、內部通用繼電器Rn、定時(計數)器等,其參與控制的方式主要是通過對應觸點的通斷狀態改變影響邏輯運算結果即輸出。
字元件則為PLC內存區域內的一個字單元(16bit),主要用作功能指令和指令的編程元件,通常用以存放數據,如數據寄存器DTn,定時(計數)器的設定值SVn、經過值EVn等。字元件沒有觸點,通常以整體內容參與控制。
值得注意的是內存中的輸入(X)區、輸出(Y)區和內部通用(R)區,該區中的每個bit均可用作位元件,而且每16bit可構成一個字元件,如WRIO即是由16個位元件R100~R10F構成的字元件,該字元件中的內容一旦發生變化,這16個位的狀態也隨之發生改變.
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廈門莫格電氣自動化有限公司
張芳(銷售工程師)
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