描述
PLC是微机技术与传统的继电器-接触器控制技术相结合的产物，其基本设计思想是把计算机功能完善、灵活、通用等优点和继电器控制系统的简单易懂、操作方便、价格便宜等优点结合起来，控制器的硬件是标准的、通用的。根据实际应用对象，将控制内容编成软件写入控制器的用户程序存储器内。继电器控制系统已有上百年历史，它是用弱电信号控制强电系统的控制方法，在复杂的继电器控制系统中，故障的查找和排除困难，花费时间长，严重地影响工业生产。
NetApp F760 Cluster (F760c) w/ (2) FC9 7 x 36GB
5 Year Next Business Day Warranty on All NetApp
NetApp X3146A-R5 NVRAM Card
NetApp 114-00014 Hot-Swap 650 Watt DC Power Supply
NetApp X500 14x36GB 10K DS14 Shelf Network Appliance
NetApp X1201B ATM OC-3 LANE – NEW
NETAPP X287A-6PK-R5 Disk Drives,6Pack,300GB,15k,SAS,R5
One-day shipping available
NETAPP X287A-R5 6-Pack 300GB 15K SAS Disk Drives
One-day shipping available
NETAPP X287A-6PK-R5 Disk Drives,6Pack,300GB,15k,SAS,R5
One-day shipping available
NETAPP X287A-R5 6-Pack 300GB 15K SAS Disk Drives
One-day shipping available
NetApp FAS3020c Network Appliance Filer Head 2.8GHz
NetApp X500 DS14 FC-AL Disk Shelf Base with (2) PS
NetApp X550 DS14mk2 FC-AL Disk Shelf Base 2 PS
NETAPP FAS3020 Filer Head 2x DC Power Supply FAS 3020 *
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS
