TRICONEX2551

空调系统的控制主要分为继电器控制系统、直接数字式控制（DDC）系统和可<a>编程序控制器（PLC）系统等级几种。由于故障率高、系统复杂、功耗高等明显的缺点，继电器控制系统已逐渐被淘汰。DDC控制系统虽然在智能化方面有了很大的发展，但由于其本身抗干扰能力差、不易联网、信息集成度不高和分级分步式结构的局限性，从而限制了其应用。相反，PLC控制系统以其运行可靠、使用维护方便、抗干扰能力强、适合新型高速<a>网络</a>结构等显著的优点，在智能建筑中得到了广泛的应用。为了提高空调系统的经济性、可靠性和可维护性，目前空调系统都倾向于采用先进、实用、可靠的PLC来进行控制

Netapp RS-PSU-450-AC2 Netapp Rs-psu-450-ac2

One-day shipping available

Nortel 114-00012+D0 Power Supply Netapp 440w

One-day shipping available

NetApp X3182A 512MB for FAS250 Network Appliance - NEW

NetApp 7 x 36GB Shelf Network Appliance

NETAPP 108-00044 NETAPP 72.8GB 10K DISK FC-AL HS (X235A

NETAPP 114-00012+D0 440W DS14 PSU

NETAPP RS-PSU-450-AC2 450W PSU

NetApp AT-FCX Module X5612 A 2Gb/sec

NetApp X5511 A ESH 2 Storage Controller Module 2Gb/sec

NEW NetApp X5605A R100 R150 Storage Shelf EMU 106-00005

Expedited shipping available

NetApp X1946A Cluster Cable SP-1946A Network Appliance

Network Appliance NetApp FAS960C Filer w/ cards (3)

Network Appliance NetApp FAS960C Filer w/ cards (4)

Network Appliance NetApp FAS960C Filer w/ cards (2)

Netapp F810 Filer Head & 90 Day warray

NetApp Emulex LP1050 2GB Single Port Fiber Channel HBA

NetApp Emulex LP 10000 DC 2GB Dual Port FC HBA

NetApp Infiniband Cluster IB Adapter LC SP-1925A X1925A

NetApp File Server Cabinet