描述
PLC的容量選擇PLC的容量包括I/O點(diǎn)數(shù)和用戶存儲(chǔ)容量?jī)蓚€(gè)方面。
1.I/O點(diǎn)數(shù)
PLC的I/O點(diǎn)的價(jià)格還比較高,因此應(yīng)該合理選用PLC的I/O點(diǎn)的數(shù)量,在滿足控制要求的前提下力爭(zhēng)使用I/O點(diǎn)最少,但必須留有一定的備用量。通常I/O點(diǎn)數(shù)是根據(jù)被控對(duì)象的輸入、輸出信號(hào)的實(shí)際需要,再加上10%-15%的備用量來(lái)確定。
2.用戶存儲(chǔ)容量
用戶存儲(chǔ)容量是指PLC用于存儲(chǔ)用戶程序的存儲(chǔ)器容量。需要的用戶存儲(chǔ)容量的大小由用戶程序的長(zhǎng)短決定。
一般可按下式估算,再按實(shí)際需要留適當(dāng)?shù)挠嗔浚?0%-30%)來(lái)選擇。
存儲(chǔ)容量=開(kāi)關(guān)量I/O點(diǎn)總數(shù)X10十模擬量通道數(shù)X100絕大部分PLC均能滿足上式要求。應(yīng)當(dāng)要注意的是:當(dāng)控制系統(tǒng)較復(fù)雜。數(shù)據(jù)處理量較大時(shí),可能會(huì)出現(xiàn)存儲(chǔ)容量不夠的問(wèn)題,這時(shí)應(yīng)特殊對(duì)待。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
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