Currently, Invensys is executing a number of digital I&C upgrade projects (both safety and non-safety related) at a number of US and overseas Nuclear Power Plants (NPP). In addition Invensys is in the final shipment stage of Lungmen, NPP project, where its scope consisted of Balance of Plant Distributed Control Information System (DCIS), including Plant Computer System (PCS). This article describes the approach and details of Invensys DCIS architecture, which is used in parts throughout various upgrade projects as well as in its entirety for a complete NPP DCIS. Figure 1 shows Invensys' Tricon Safety System and non safety-related I/A DCIS connected on a MESH Fast Ethernet communications network. A similar architecture is currently being implemented to various degrees on several nuclear projects in US and abroad. The communication backbone of the system is a switched Ethernet MESH network based on IEEE 802.3u (Fast Ethernet) and IEEE 802.3z (Gigabit Ethernet) standards. The control network offers essentially unlimited expansion capability by addition of processors and interconnecting Ethernet Switches.
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机译：目前，Invensys正在在许多美国和海外核电站（NPP）上执行许多数字I＆C升级项目（安全和非安全相关）。此外，Invensys是龙门，NPP项目的最终装运阶段，其范围包括工厂分布式控制信息系统（DCIS）的平衡，包括植物计算机系统（PC）。本文介绍了Invensys DCIS架构的方法和细节，该架构在各种升级项目中的零件中使用，以及完整的NPP DCIS的整体。图1显示了在网格快速以太网通信网络上连接的Invensys'Tricon安全系统和非安全相关I / A DCIS。目前在美国和国外的几个核项目上实施了类似的架构。系统的通信骨干是基于IEEE 802.3U（快速以太网）和IEEE 802.3z（千兆以太网）标准的交换以太网网状网络。控制网络通过添加处理器和互连以太网交换机提供基本上无限的扩展功能。
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