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廈門鈦霓電氣有先公司
主營產(chǎn)品： 電工電氣，工控設(shè)備，PLC |
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廈門鈦霓電氣有先公司
主營產(chǎn)品： 電工電氣，工控設(shè)備，PLC |
暫無信息 |
| 參考價 | 面議 |
1786-RG6
1786-RG6
.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(xù)變化的。工業(yè)生產(chǎn)，特別是連續(xù)型生產(chǎn)過程，常要對這些物理量進(jìn)行控制。
作為一種工業(yè)控制電子裝置，PLC若不能對這些量進(jìn)行控制，那是一大不足。為此，各PLC廠家都在這方面進(jìn)行大量的開發(fā)。目前，不僅大型、中型機(jī)可以進(jìn)行模擬量控制，就是小型機(jī)，也能進(jìn)行這樣的控制。
PLC進(jìn)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。
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