1783-BMS20CA

1783-BMS20CA

1783-BMS20CA

由于图]所示分层网络体系中一般都采用了双服务器和多操作员站的配置，因此可以将操作管理网络人为划分为两个相对独立的以太网，两个网络通过网桥连接，两个服务器分别挂接在两个以太网上，而操作员站则平分在两个网络上，例如目前一般一套机组DCS配有5个操作员站，因此可以按2、3分布，如图2所示。这样，在正常情况下，每个服务器都只服务与各自对应的操作员站，从而减少了网络传输负荷和服务器负荷，可以显著提高系统的响应速度度。如果出现异常情况，譬如一台服务器瘫痪，那么通过网桥两个以太网又成为一个整体，此时工作的服务器同时服务于所有操作员站，此时虽然响应速度稍微慢一些，但是完全不影响正常使用。采用这种方法不仅充分利用了两台服务器，而且只增加一个网桥的情况下就可以明显改变系统响应速度，因此是一种“低投入，高回报”的解决方案。根据作者的了解，目前贝利公司的SYMPHONY、ABB公司的PROCONTROI。P和日立公司的HIACS5000+都采用了该措施。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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◆ 企业名称：厦门泰尼电气有限公司

◆ 联系人： 小廖（女士）

◆ 电话：0592-6539066
   
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