Description
从系统的可扩展性和兼容性的方面来说。
市场上控制类产品繁多，无论DCS还是PLC，均有很多厂商在生产和销售。对于PLC系统来说，一般没有或很少有扩展的需求，因为PLC系统一般针对于设备来使用。一般来讲，PLC也很少有兼容性的要求，比如两个或以上的系统要求资源共享，对PLC来讲也是很困难的事。而且PLC一般都采用专用的网络结构，比如西门子的MPI总线性网络，甚至增加一台操作员站都不容易或成本很高。
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New Juniper NS-5000-8G2 Netsreen 8 GigE Secure Port Mod
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Net Promina 800 IDNX 90 Multiplexer Loaded
Nokia NIF4585FRU 1Port 10GBASE-SR Int ADP IP2255
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Nokia NIF4525FRU 10-Gigabit Ethernet Int SR IP2250
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Nortel Passport 8610 Switch 8692SF 8648TXE 8608GBE AC
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