140SAI94000S
140SAI94000S
采用上述方案后，操作管理网络的通讯效率和可靠性都得到了较大提升。其实类似的分段措施在控制网络层也有使用，最典型的就是在日立公司HIACS3000／5000系统和FOXBORO公司的I/ASeries系统，其示意图如图3所示，此时控制层网络按照系统划分为燃烧系统、汽水系统和给水系统等。通过划分，各个控制网络段的通讯负荷有效降低，通讯实时性大大提高，可靠性也得到显著改善。但是需要注意的是，采用这种方式时，控制网络段的划分和控制机柜的合理分布非常关键，在可能的情况下，将数据交换频繁的控制机柜放在同一控制网络段上可以大大改善通讯实时性。例如根据日立公司提供的相关资料，在日立HIACS3000／5000系统中，机柜内数据传输周期为lOOms，而同一控制网络上控制机柜数据交换需要200ms，如果需要在不同控制网络上控制机柜之间交换数据则需要400ms时间。采用这种方式的潜在优点就是可以更好地实现控制机柜的物理分散，因为控制网络段可以根据需要加以灵活配置，这在FOXBORO公司的DCS实际应用系统中得到了较好的体现。
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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