传统的继电器控制系统中使用了大量的中间继电器、时间继电器。由于触点接触不良，容易出现故障，PLC用软件代替大量的中间继电器和时间继电器，仅剩下与输入和输出有关的少量硬件，接线可减少互继电器控制系统的1/10--1/100，因触点接触不良造成的故障大为减少。

PLC采取了一系列硬件和软件抗干扰措施，具有很强的抗干扰能力，平均无故障时间达到数万小时以上，可以直接用于有强烈干扰的工业生产现场，PLC已被广大用户公认为***可靠的工业控制设备之一。

NetApp X680 7x72GB 10K BCS FC9 Shelf

NetApp DS14 MK2 AT shelf w/ 14x 500GB SATA drives X267A

NetApp DS14MK2 AT shelf + 14x 500GB X267A + 2x AT-FCX

Network Appliance NetApp F880 Filer Head
One-day shipping ***ailable

NetApp FAS960 Filer NEW WITHOUT ORIGINAL BOX LOW PRICE

NETAPP X5611A 106-00024+A0 STORAGE CONTROLLER MODULE!

NetApp Emulex LP11002 4GB Dual Port FC HBA X1087 A R6

NetApp DS14 MK2 FC w/ 14x X274 a 144GB 10krpm HD +ESH 

NetApp DS14 mk2 AT w/ 14x320GB HDD, 2x AT-FC Modules 

NetApp C6100 NetCache Proxy Server 
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NetApp DS14 MK2 Fiber Storage Shelf 14x 144GB 2TB
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp DS14 MK2 14x 144GB 2TB Fiber Shelf
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp FAS270 Filer No Disk Network Appliance 
Disk ***ailable!! 1 Year Warranty! We ship worldwide!!!

NetApp FAS270 Filer No Disk Network Appliance 
Disk ***ailable!! 1 Year Warranty! We ship worldwid