| 詳細(xì)參數(shù) | |||
|---|---|---|---|
| 品牌 | DEIF | 型號(hào) | SCM4-2 |
| 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 | 功能 | PCB卡 |
| 工作電壓 | 電源組24VDC | 數(shù)據(jù)容量 | 4兆字節(jié) |
| 產(chǎn)品認(rèn)證 | CE | 環(huán)境溫度 | 0°Cto,60°C |
| 環(huán)境濕度 | 0到90%的相對(duì)濕度,無(wú)冷凝 | 加工定制 | 否 |
| 重量 | 6.76磅 | ||
DEIF SCM 4-2 PCB 卡
SCM 4-2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(guò)程，常要對(duì)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(duì)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(kāi)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(guò)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(gè)區(qū)?？勺x寫(xiě)）交換信息等等特點(diǎn)。這里的A/D中的A，多為電流，或電壓，也有為溫度。D/A中的A，多為電壓，或電流。電壓、電流變化范圍多為0～5V，0～10V，4～20mA。有的還可處理正負(fù)值的。
SCM 4-2 analog quantity, such as current, voltage, temperature, pressure, etc. its size changes continuously. Industrial production, especially continuous production process, often need to control these physical quantities. As an industrial control electronic device, if PLC can not control these quantities, it is a big deficiency. Therefore, various PLC manufacturers have carried out a lot of development in this regard. At present, not only large and medium-sized computers can carry out analog control, but also small computers can carry out such control. For analog quantity control, PLC shall be equipped with a / D and D / a units for mutual conversion of analog quantity and digital quantity. It is also an I / O unit, but it is a special I / O unit.
A / D unit converts the analog quantity of external circuit into digital quantity, and then sends it to PLC. D / a unit converts the digital quantity of PLC into analog quantity and then sends it to the external circuit. As a special I / O unit, it still has the characteristics of anti-interference of I / O circuit, isolation of internal and external circuits, exchange of inbation with b and output relay (or internal relay, which is also an area of PLC working memory. Read and write), and so on. A in a / D here is mostly current, voltage or temperature. A in D / A is mostly voltage or current. The variation range of voltage and current is mostly 0 ~ 5V, 0 ~ 10V and 4 ~ 20mA. Some can also handle positive and negative values.
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