這樣，用PLC實(shí)現(xiàn)模擬量控制是完全可能的?？刂频膯挝恢悼尚〉?/span>212分之一的測(cè)量程值，多數(shù)也是足夠的。
PLC進(jìn)行模擬量控制，還有A/D、D/A組合在一起的單元，并可用PID或模糊控制算法實(shí)現(xiàn)控制，可得到很高的控制質(zhì)量。
用PLC進(jìn)行模擬量控制的好處是，在進(jìn)行模擬量控制的同時(shí)，開關(guān)量也可控制。這個(gè)優(yōu)點(diǎn)是別的控制器所不具備的，或控制的實(shí)現(xiàn)不如PLC方便。
當(dāng)然，若純?yōu)槟M量的系統(tǒng)，用PLC可能在性能價(jià)格比上不如用調(diào)節(jié)器。這也是應(yīng)當(dāng)看到的。
3.3用于運(yùn)動(dòng)控制
實(shí)際的物理量，除了開關(guān)量、模擬量，還有運(yùn)動(dòng)控制。如機(jī)床部件的位移，常以數(shù)字量表示。
運(yùn)動(dòng)控制，有效的辦法是NC，即數(shù)字控制技術(shù)。這是50年代誕生于美國(guó)的基于計(jì)算機(jī)的控制技術(shù)。當(dāng)今已很普及，并也很完善。目前，先進(jìn)國(guó)家的金屬切削機(jī)床，數(shù)控化的比率已超過(guò)40％～80％，有的甚至更高。
備貨，備貨，降降降，火火火，火火火……
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