描述

PLC常用以下幾種存儲(chǔ)器：

(1)隨機(jī)存取存儲(chǔ)器：(RAM)

用戶可以用編程器讀出RAM中的內(nèi)容，也可以將用戶程序?qū)懭隦AM，因此RAM又叫讀／寫存儲(chǔ)器。它是易失性的存儲(chǔ)器，將它的電源斷開后，儲(chǔ)存的信息將會(huì)丟失。

RAM的工作速度高，價(jià)格低，改寫方便。為了在關(guān)斷PLC外部電源后，保存RAM中的用戶程序和某些數(shù)據(jù)(如計(jì)數(shù)器的計(jì)數(shù)值)，為RAM配備了一個(gè)鋰電池?，F(xiàn)在有的PLC仍用RAM來儲(chǔ)存用戶程序。

鋰電池可用2~5年，需要更換鋰電池時(shí)，PLC面板上的“電池電壓過低”發(fā)光二極管亮，同時(shí)有一個(gè)內(nèi)部標(biāo)志位變?yōu)閘狀態(tài)，可以用它的常開觸點(diǎn)來接通控制屏面板上的指示燈或聲光報(bào)警器，通知用戶及時(shí)更換鋰電池。

(2)只讀存儲(chǔ)器(ROM)

ROM的內(nèi)容只能讀出，不能寫入。它是非易失的，它的電源消失后，仍能保存儲(chǔ)存的內(nèi)容。ROM—般用來存放PLC的系統(tǒng)程序。

(3)可電擦除的EPROM(EEPROM或E2PROM)

它是非易失性的，但是可以用編程器對它編程，兼有ROM的非易失性和RAM的隨機(jī)存取優(yōu)點(diǎn)。但是寫入信息所需的時(shí)間比RAM長得多，EEPROM用來存放用戶程序。有的PLC將EEPROM作為基本配置，有的PLC將EEPROM作為可選件。

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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