產(chǎn)品

PLC常用以下幾種存儲器：
    (1)隨機(jī)存取存儲器：(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／寫存儲器。它是易失性的存儲器，將它的電源斷開后，儲存的信息將會丟失。
    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)只讀存儲器(ROM)TEL:19959282717
    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

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