描述
在討論控制系統(tǒng)的時(shí)候,I/O點(diǎn)是最經(jīng)常聽到的一個(gè)術(shù)語。它是指輸入/輸出點(diǎn),I代表INPUT,指輸入,O代表OUTPUT,指輸出。輸入/輸出都是針對(duì)控制系統(tǒng)而言,輸入指從儀表進(jìn)入控制系統(tǒng)的測(cè)量參數(shù),輸出指從控制系統(tǒng)輸出到執(zhí)行機(jī)構(gòu)的參量,一個(gè)參量叫做一個(gè)點(diǎn)。一個(gè)控制系統(tǒng)的規(guī)模有時(shí)按照它最大能夠控制的I/O點(diǎn)的數(shù)量來定的。
什么是模擬量和開關(guān)量?
在控制系統(tǒng)中,另一個(gè)常見的術(shù)語就是模擬量和開關(guān)量。不論輸入還是輸出,一個(gè)參數(shù)要么是模擬量,要么是開關(guān)量。模擬量指控制系統(tǒng)量的大小是一個(gè)在一定范圍內(nèi)變化的連續(xù)數(shù)值,比如溫度,從0-100度,壓力從0-10MPA,液位從1-5米,電動(dòng)閥門的開度從0-100%,等等,這些量都是模擬量。而開關(guān)量指該物理量只有兩種狀態(tài),如開關(guān)的導(dǎo)通和斷開的狀態(tài),繼電器的閉合和打開,電磁閥的通和斷等等。
對(duì)控制系統(tǒng)來說,由于CPU是二進(jìn)制的,數(shù)據(jù)的每位有“0”和“1”兩種狀態(tài),因此,開關(guān)量只要用CPU內(nèi)部的一位即可表示,比如,用“0”表示開,用“1”表示關(guān)。而模擬量則根據(jù)精度,通常需要8位到16為才能表示一個(gè)模擬量。最常見的模擬量是12位的,即精度為2-12,最高精度約為萬分之二點(diǎn)五。當(dāng)然,在實(shí)際的控制系統(tǒng)中,模擬量的精度還要受模擬/數(shù)字轉(zhuǎn)換器和儀表的精度限制,通常不可能達(dá)到這么高。
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