描述
开放式PLC硬件结构采用CPU+外围模块+接口构成，各个接口都按标准设计，大大提高了PLC的开放性，使其能方便地与大系统连接。编程语言遵循国际标准IEC61131-3，并将基于PC的编程软件作为PLC首选编程工具。系统硬件部分采用高性能51内核处理器STC89C51，其为模块化设计，采用滤波、隔离电路，以降低成本。主要电路有：微控制器STC89C51RC、开关量输入电路、继电器输出电路、晶体管输出电路、RS232通信接口电路、电源电路、时钟复位电路和USB通信接口电路等，PLC硬件系统框图如图2所示，软件采用Borland公司集成开发软件C++Builder，通过集成平台对51内核处理器指令集进行解释、编译，使梯形图语言转换为能被51内核处理器识别的代码。
NetApp FAS3020 Filer w/ DS14MK2-AT 14x 750GB X268A-R5
NetApp 14 x 1TB SATA Shelf X269A disks / N-Series Bezel
NetApp DS14MK4 Disk Shelf w/ 7x 450GB 15K FC X291A MK4
NetApp FAS3020 Filer w/DS14MK2 14x 300GB 10K 4.2TB!!!!!
NetApp FAS3020 Filer w/DS14MK2 14x 300GB 10K 4.2TB!!!!!
NetApp FAS3020 Filer w/DS14MK2 14x 300GB X276A 4.2TB!!!
NetAPP FAS270 Network Appliance Filer + 14 x 300GB
Lot 10pc Netapp X269A-R5 SP-269A-R5 108-00180 1TB SATA
NetApp FAS3050 Filer w/ DS14MK2 14x 144GB 15K X275A-R5
NetApp FAS3050 Filer w/ DS14MK2 14x 144GB 15K X275A-R5
Network Appliance NetApp FAS3070 Filer
NetApp FAS3050 Filer w/DS14MK2 14x 144GB 15K X275A-R5 !
NetApp DS14MK2 10.5TB 14x750GB SATA Disk Shelf 10.5TB
NetApp FAS3050 Filer DS14MK2 14x 144GB 15K X275A-R5 2TB
NetApp FAS3050 Filer w/ DS14MK2 14x 144GB 15K X275A-R5
