plc可编程控制器系统ram存储区包括i/o映象区以及各类软设备（例如：逻辑线圈、数据寄存器、计时器、计数器、变址寄存器、累加器等）存储区。
（a）i/o映象区
由于plc投入运行后，只是在输入采样阶段才依次读入各输入状态和数据，在输出刷新阶段才将输出的状态和数据送至相应的外设。因此，它需要有一定数量的存储单元（ram）以供存放i/o的状态和数据，这些存储单元称作i/o映象区。一个开关量i/o占用存储单元中的一个位（bit）,一个模拟量i/o占用存储单元中的一个字（16个bit)。因此，整个i/o映象区可看作由开关量的i/o映象区和模拟量的i/o映象区两部分组成。
（b）系统软设备存储区
除了i/o映象区以外，系统ram存储区还包括plc内部各类软设备（逻辑线圈、数据寄存器、计时器、计数器、变址寄存器、累加器等）的存储区。该存储区又分为具有失电保持的存储区域和无失电保持的存储区域，前者在plc断电时，由内部的锂电子供电。使这部分存储单元内的数据得以保留；后者当plc停止运行时，将这部分存储单元内的数据全部置“零”。
产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。
主营dcs系统配件
机器人系统配件
大型伺服系统配件
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agilestar - 15454-gbic-38-1?- for cisco - new in box
agilestar - 15454-gbic-38-9?- for cisco - new in box
agilestar - 15454-gbic-39-7?- for cisco - new in box
agilestar - 15454-gbic-40-5?- for cisco - new in box
agilestar - 15454-gbic-42-1?- for cisco - new in box
agilestar - 15454-gbic-42-9?- for cisco - new in box
agilestar - 15454-gbic-43-7?- for cisco - new in box
agilestar - 15454-gbic-44-5?- for cisco - new in box
agilestar - 15454-gbic-46-1?- for cisco - new in box
agilestar - 15454-gbic-46-9?- for cisco - new in box
agilestar - 15454-gbic-47-7?- for cisco - new in box
agilestar - 15454-gbic-48-5?- for cisco - new in box
agilestar - 15454-gbic-50-1?- for cisco - new in box
agilestar - 15454-gbic-50-9?- for cisco - new in box
agilestar - 15454-gbic-51-7?- for cisco - new in box
agilestar - 15454-gbic-54-1?- for cisco - new in box
agilestar - 15454-gbic-54-9?- for cisco - new in box
agilestar - 15454-gbic-55-7?- for cisco - new in box
agilestar - 15454-gbic-56-5?- for cisco - new in box
agilestar - 15454-gbic-58-1?- for cisco - new in box
agilestar - 15454-gbic-58-9?- for cisco - new in box
agilestar - 15454-gbic-59-7?- for cisco - new in box
agilestar - 15454-gbic-60-6?- for cisco - new in box
agilestar - 3he00070aa - for alcatel-lucent - nib
agilestar - 3he00070ab - for alcatel-lucent - nib
agilestar - 3he00070ac - for alcatel-lucent - nib
agilestar - 3he00070ad - for alcatel-lucent - nib
agilestar - 3he00070ae - for alcatel-lucent - nib
agilestar - 3he00070af - for alcatel-lucent - nib
agilestar - 3he00070ag - for alcatel-lucent - nib
agilestar - 3he00070ah - for alcatel-lucent - nib
agilestar - 3he00045aa-as - for alcatel - new in box
agilestar - 10112 - for extreme networks - new in box
agilestar - 10113 - for extreme networks - new in box
agilestar - f5upgxfperopr-a?s - for f5 networks - new in
agilestar - xenpak-1xge-er - juniper - new in box
agilestar - 15454-gbic-52-5?- for cisco - new in box
agilestar - su69cc-as - for marconi - xfp 10gbase-er sm
agilestar - as-xfp-10g-er - for agilestar - new in box
agilestar - sfp-gig-extnd - for alcatel-lucent - nib
agilestar - sfp-gig-47cwd60 - for alcatel-lucent -nib
agilestar - sfp-gig-49cwd60 - for alcatel-lucent -nib
agilestar - sfp-gig-51cwd60 - for alcatel-lucent -nib
agilestar - sfp-gig-53cwd60 - for alcatel-lucent - nib
agilestar - sfp-gig-55cwd60 - for alcatel-lucent - nib
agilestar - sfp-gig-57cwd60 - for alcatel-lucent - nib
agilestar - sfp-gig-59cwd60 - for alcatel-lucent - nib
agilestar - sfp-gig-61cwd60 - for alcatel-lucent -nib
agilestar - sf2g-lx3-5c-47-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-49-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-51-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-53-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-55-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-57-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-59-?as - for fibrolan - new in b
agilestar - sf2g-lx3-5c-61-?as - for fibrolan - new in b
agilestar - xfp-10g-e-oc192?-ir1 - juniper - new in box
agilestar - 10g-xnpk-er - for foundry networks - nib
agilestar - 3cxenpak96 - for use in 3com - 10gbase-er
agilestar - 1184560p1 - for use in adtran - new in box
agilestar - as-x2-10g-er - for agilestar - new in box
agilestar - as-xen-10g-er - for agilestar - new in box
agilestar - su69ca-as - for marconi - xfp 10gbase-lr sm
agilestar - 10gbase-er-xfp - enterasys networks - nib
agilestar - e1mg-bxd-40km-a?s - for foundry - new in box
agilestar - e1mg-bxu-40km-a?s - for foundry - new in box
agilestar - 15454-gbic-1470 - for cisco - new in box
agilestar - 15454-gbic-1490 - for cisco - new in box
agilestar - 15454-gbic-1510 - for cisco - new in box
agilestar - 15454-gbic-1530 - for cisco - new in box
agilestar - 15454-gbic-1550 - for cisco - new in box
agilestar - 15454-gbic-1570 - for cisco - new in box
agilestar - 15454-gbic-1590 - for cisco - new in box
agilestar - 15454-gbic-1610 - for cisco - new in box
agilestar - as-sfp10g-er - for agilestar - new in box
agilestar - ftlx1612m3btl - for finisar - new in box
agilestar - ons-se-622-1490 - for cisco - new in box
agilestar - ons-se-622-1570 - for cisco - new in box
agilestar - ons-se-622-1470 - for cisco - new in box
agilestar - ons-se-622-1530 - for cisco - new in box
agilestar - ons-se-622-1610 - for cisco - new in box
agilestar - ons-se-622-1510 - for cisco - new in box
agilestar - ons-se-622-1550 - for cisco - new in box
agilestar - ons-se-622-1590 - for cisco - new in box
agilestar - ex-xfp-10ge-er - juniper - new in box
agilestar - 10124 - for extreme networks - new in box
agilestar - j8438a - for hp - new in box
agilestar - at-xper40 - for use in allied telesis - nib
agilestar - gp-xfp-1e - for force 10 networks - nib
agilestar - xfp-10ge-er40 - for alcatel-lucent - nib
agilestar - ftrx-1611-3 - for finisar - new in box
agilestar - aa1419066-e6-as - for nortel - new in box
agilestar - 3he00042aa - for alcatel-lucent - nib
agilestar - 3cxfp96 - for use in 3com - new in box
agilestar - ons-se-z1 - for cisco - new in box
agilestar - xfp-lr-as - for alcatel - new in box
agilestar - xfp-10ger-oc192?ir - for cisco - new in box
agilestar - xfp-10ge-er - for redback - new in box
agilestar - xenpak-10gb-er - for cisco - new in box
agilestar - aa1419053-e6-as - for nortel - new in box
agilestar - aa1419054-e6-as - for nortel - new in box
agilestar - aa1419056-e6-as - for nortel - new in box
agilestar - aa1419058-e6-as - for nortel - new in box
agilestar - dwdm-sfp-30.33 - for cisco - new in box
agilestar - dwdm-sfp-31.12 - for cisco - new in box
agilestar - dwdm-sfp-31.90 - for cisco - new in box
agilestar - dwdm-sfp-32.68 - for cisco - new in box
agilestar - dwdm-sfp-34.25 - for cisco - new in box
agilestar - dwdm-sfp-35.04 - for cisco - new in box
agilestar - dwdm-sfp-35.82 - for cisco - new in box
agilestar - dwdm-sfp-36.61 - for cisco - new in box
agilestar - dwdm-sfp-38.19 - for cisco - new in box
agilestar - dwdm-sfp-38.98- for cisco - new in box
agilestar - dwdm-sfp-39.77- for cisco - new in box
agilestar - dwdm-sfp-40.56- for cisco - new in box
agilestar - dwdm-sfp-42.14- for cisco - new in box
agilestar - dwdm-sfp-42.94- for cisco - new in box
agilestar - dwdm-sfp-43.73- for cisco - new in box
agilestar - dwdm-sfp-44.53- for cisco - new in box
agilestar - dwdm-sfp-46.12- for cisco - new in box
agilestar - dwdm-sfp-46.92- for cisco - new in box
agilestar - dwdm-sfp-47.72- for cisco - new in box
agilestar - dwdm-sfp-48.51- for cisco - new in box
agilestar - dwdm-sfp-50.12- for cisco - new in box
agilestar - dwdm-sfp-50.92- for cisco - new in box
agilestar - dwdm-sfp-51.72- for cisco - new in box
agilestar - dwdm-sfp-52.52- for cisco - new in box
agilestar - dwdm-sfp-54.13- for cisco - new in box
agilestar - dwdm-sfp-54.94- for cisco - new in box
agilestar - dwdm-sfp-55.75- for cisco - new in box
agilestar - dwdm-sfp-56.55- for cisco - new in box
agilestar - dwdm-sfp-58.17- for cisco - new in box
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