| 詳細參數(shù) | |||
|---|---|---|---|
| 品牌 | AB(Allen-Bradley) | 型號 | 1747-L542 |
| 結(jié)構(gòu)形式 | 模塊式 | 安裝方式 | 控制室安裝 |
| LD指令處理器 | 硬PLC | 加工定制 | 否 |
1747-L542
作為一種工業(yè)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(fā)。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(shù)字量相互轉(zhuǎn)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(zhuǎn)換成數(shù)字量，然后送入PLC。D/A單元，是把PLC的數(shù)字量轉(zhuǎn)換成模擬量，再送給外電路。
作為一種特殊的I/O單元，它仍具有I/O電路抗干擾、內(nèi)外電路隔離，與輸入輸出繼電器（或內(nèi)部繼電器，它也是PLC工作內(nèi)存的一個區(qū)?？勺x寫）交換信息等等特點。
備貨，備貨，降降降，火火火，火火火……
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