XV371a

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。

 

NetApp 14 x 1TB MK2 AT Disk Shelf - X269, X269A disks

NetApp FAS3070 Filer DS14MK2-AT 14x 500GB X267A-R5 7TB!

NEW! 12 Pack Netapp X298A-R5 1TB SATA FAS2040 FAS2050 !

Qty 5 Netapp DS14MK2-AT 14x 500GB X267A SATA 35TB!!!!!

NEW 12-Pack Netapp X298A-R5 1TB SATA FAS2020 FAS2050

NEW 12-Pack Netapp X298A-R5 1TB SATA 2020 2040 2050 

NetApp FAS3050 Filer 2x DS14MK2 14x 144GB 15K X275A-R5

NetApp FAS3050 Filer 2x DS14MK2 14x 144GB 15K X275A-R5

5pcs of Netapp DS14MK2AT 14x X267A 500GB SATA 35TB!!

NEW 12-Pack Netapp X298A-R5 1TB SATA FAS2020 FAS2050

NetApp FAS3050 Filer 2x DS14MK2-AT 14x 500GB X267A-R5 ~

NetApp FAS3050 Filer w/2x DS14MK2-AT 14x 500GB X267A-R5

NetApp NetCache C1200 Appliance 1U 3x 36GB HD

Netapp FAS3020 filer 

Network Appliance NetApp F820C