描述

用戶可以用編程器讀出RAM中的內容，也可以將用戶程序寫入RAM，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，價格低，改寫方便。為了在關斷PLC外部電源后，保存RAM中的用戶程序和某些數(shù)據(jù)(如計數(shù)器的計數(shù)值)，為RAM配備了一個鋰電池?，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，PLC面板上的“電池電壓過低”發(fā)光二極管亮，同時有一個內部標志位變?yōu)閘狀態(tài)，可以用它的常開觸點來接通控制屏面板上的指示燈或聲光報警器，通知用戶及時更換鋰電池。

(2)只讀存儲器(ROM)

ROM的內容只能讀出，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的隨機存取優(yōu)點。但是寫入信息所需的時間比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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Family Certification

Level Hardware Manufacturer Board BSP Name

68030 Wind River Product Motorola,Inc.Motorola MVME147A mv147

68040 Wind River Product Motorola,Inc.Motorola MVME162PA mv162

68040 Wind River Product Motorola,Inc.Motorola MVME167PA mv167

68060 Wind River Product Motorola,Inc.Motorola MVME172PA mv172

68060 Wind River Product Motorola,Inc.Motorola MVME177P/PA mv177

683xx Wind River Product Freescale,Inc.M86EN302 FADS fads302en

683xx Wind River Product Wind River Wind River SBC360 wrSbc360

AMCC 4xx Wind River Product AMCC AMCC 405GP Walnut Board walnut

AMCC 4xx Wind River Product AMCC AMCC PPC 440GP Ebony ebony

AMCC 4xx Wind River Product AMCC AMCC PPC 440GX Ocotea ocotea

AMCC 4xx Wind River Product Wind River Wind River PPMC440GP wrPpmc440gp

AMCC PPC405xx Uncertified Advanet Inc.A6pci7503 VxWorks 5.5.1 BSP for A6pci7503

AMCC PPC405xx Uncertified Advanet Inc.Advme7507A VxWorks 5.5.1 BSP for Advme7507A

AMCC PPC440xx Uncertified Advanet Inc.Advme7510 VxWorks 5.5.1 BSP for Advme7510

AMCC PPC440xx Not Supported AMCC PPC440SP Evaluation Board(Luan)VxWorks 5.5.1 BSP for amcc440sp

AMCC PPC440xx Not Supported AMCC PPC440SPE Evaluation Board(Yucca)VxWorks 5.5.1 BSP for AMCC440spe

AMD Uncertified ADLINK TECHNOLOGY INC.(Ampro)ETX-GX2 VxWorks 5.5.1 BSP for ETX-GX2

ARM Other Wind River Product ARM Ltd.ARM Integrator 946ES integrator946es

ARM Other Wind River Product ARM Ltd.ARM Integrator 966ES integrator966es

ARM7 Thumb Wind River Product ARM Ltd.ARM Integrator 720T integrator720t

ARM7 Thumb Wind River Product ARM Ltd.ARM Integrator 740T integrator740t

ARM7 Thumb Wind River Product ARM Ltd.ARM Integrator 7T integrator7t

ARM9 Not Supported Fujitsu airman926ej/Fujitsu SoC 802.16 Reference Kit airman926ej

ARM9 Thumb Wind River Product ARM Ltd.ARM Integrator 920T integrator920t

ARM9 Thumb Wind River Product ARM Ltd.ARM Integrator 940T integrator940t

Broadcom BCM125x Wind River Product Broadcom Corporation Broadcom BCM91250a VxWorks 5.5.1 BSP for bcm1250

Broadcom BCM125x Wind River Product Broadcom Corporation Broadcom BCM91250e Sentosa bcm1250e

Cavium Octeon Wind River Product Cavium Networks CN30XX-EVB-HS5,CN52XX-EVB-MB4-Y VxWorks 5.5.1 BSP for Cavium CN50xx/CN52xx

Cavium Octeon Not Supported Cavium Networks CN5800-EVB-NIC4,CN5600-EVB-MB12 VxWorks 5.5 BSP for Cavium OCTEON CN58XX,CN56XX/5434R/54XX

Celeron Uncertified ADLINK TECHNOLOGY INC.(Ampro)ETX-IM266 VxWorks 5.5.1 BSP for ETX-IM266

Celeron Uncertified ADLINK TECHNOLOGY INC.(Ampro)ETX-IM333 VxWorks 5.5.1 BSP for ETX-IM333

Celeron Uncertified ADLINK TECHNOLOGY INC.(Ampro)cPCI-3840 VxWorks 5.5.1 BSP for cPCI-3840

Celeron Uncertified Advanet Inc.Advme8017 VxWorks 5.5.1 BSP for Advme8017

Core 2 Not Supported Emerson Network Power Emerson CPCI-7200 VxWorks 5.5.1 BSP for Emerson CPCI-7200

Core 2 Not Supported Intel Corporation Miscowabic Peak VxWorks 5.5.1 BSP for Miscowabic Peak(AMP)

Freescale 74xx Wind River Product Freescale,Inc.Freescale Sandpoint with PMC74xx VxWorks 5.5.1 BSP for sp74xx

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Freescale 74xx Wind River Product Motorola,Inc.Motorola PRPMC800 prpmc800

Freescale 74xx Wind River Product Wind River Wind River PPMC74xx wrPpmc74xx

Freescale 74xx Wind River Product Wind River Wind River SBC7410 wrSbc7410

Freescale 74xx Uncertified Kontron AG VxG4 Dual and Quad 7410 Computing Node VxWorks 5.5.1 BSP for VxG4