在整个过程控制系统中***容易发生故障地点在现场，表2列出了现场中***容易出故障的几个方面。

***类故障点(也是故障***多的地点)在继电器、接触器。如该生产线PLC控制系统的日常维护中，电气备件消耗量***大的为各类继电器或空气开关。主要原因除产品本身外，就是现场环境比较恶劣，接触器触点易打火或氧化，然后发热变形直至不能使用。在该生产线上所有现场的控制箱都是选用密闭性较好的盘柜，其内部元器件较其他采用敞开式盘柜内元器件的使用寿命明显要长。所以减少此类故障应尽量选用高性能继电器，改善元器件使用环境，减少更换的频率，以减少其对系统运行的影响。

NetApp X6203B FC7/FC8 Fan Network Appliance

NetApp X1025D 106-00014 Optical Gigabit Ethernet Card
Expedited shipping ***ailable

NetApp RS-1400-FC DS14 Xyratec W/ 14x 73GB DK 32EJ-72FC

NetApp Hard Drive 500GB SATA X267A-R5 FOR DS14 MK2
90 day warranty

Netapp XLPSU-NR1 X610B PSU Power Supply Module FC7 FC8

NetApp X5612A-R5 106-00101 AT-FCX Controller Module

NetApp X267A-R5 500GB SATA Drive DS14Mk2-AT 108-00088

NetApp CompactFlash Boot Card & Adapter for Filer
One-day shipping ***ailable

Netapp XLPSU-NF2 PSU Power Supply Module FC9 FC8

NetApp 112-02115 AMPHENOL FCAL shelf to shelf cable NEW

Networkappli 200-01579 Control Board For Net App Server
One-day shipping ***ailable

Netapp 108-02290 301w X721a Psu
One-day shipping ***ailable

Netapp GBIC 2 GB Optical Adapter x6529 332-00006

NETAPP 108-02290 301W X721A PSU

NetApp X276A-R5 300GB FC 10K DS14 & DS14MK2 WARRANTY