1756-A13
1756-A13
用PLC進行開關量控制實例是很多的,冶金、機械、輕工、化工、紡織等等,幾乎所有工業行業都需要用到它。目前,PLC首用的目標,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。
3.2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。
作為一種工業控制電子裝置,PLC若不能對這些量進行控制,那是一大不足。為此,各PLC廠家都在這方面進行大量的開發。目前,不僅大型、中型機可以進行模擬量控制,就是小型機,也能進行這樣的控制。
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。
A/D單元是把外電路的模擬量,轉換成數字量,然后送入PLC。D/A單元,是把PLC的數字量轉換成模擬量,再送給外電路。
◆ 企業名稱:廈門泰尼電氣有限公司
◆ 企業性質: 有限責任公司
◆ 主營業務:DCS,PLC
◆ 經營模式: 貿易
◆ 貿易地區: 全國
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◆ 郵政編碼: 361026
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