描述
PLC采用扫描方式工作。从实时性要求来看，处理速度应越快越好，如果信号持续时间小于扫描时间，则PLC将扫描不到该信号，造成信号数据的丢失。
处理速度与用户程序的长度、CPU处理速度、软件质量等有关。目前，PLC接点的响应快、速度高，每条二进制指令执行时间约0.2～0.4Ls，因此能适应控制要求高、相应要求快的应用需要。扫描周期（处理器扫描周期）应满足：小型PLC的扫描时间不大于0.5ms/K；大中型PLC的扫描时间不大于0.2ms/K。
NetApp DSX-10.5TB-QS-R5 DS14MK2-AT 14) X268A-R5 750GB
NetApp DSX-10.5TB-R5-C DS14MK2-AT 14x X268A-R5 750GB
NetApp DS14MK2-AT 10.5TB w/ 14x 750GB 7.2K SATA HDs
NetApp DS14MK2-AT 10.5TB (14) X268A 750GB SATA Drives
NetApp DS14MK2-AT 10.5TB 14x X268A-R5 750GB SATA Drives
NetApp 14 x 750gb MK2 AT Disk Shelf – X268, X268A disks
NetApp X306A-R5 2TB 7.2K RPM 3Gb SATA HDD for DS4243
NetApp DS14MK2 AT 14x X268A-R5 750GB SATA HDs 10.5TB!!!
