531X303MCPARG1 F31X303MCPAPG100600

在处理串行通讯时，通讯线路服务器(CLS)是一个很好的选择。它能实施对冗余的物理路径进行遥测和，进行无缝的在线切换，可满足不同的通信网络，不同的通信媒介，提供多种通信协议。

　　3、 数据库子系统

　　I/A SCADA数据库建立在VERSANT对象数据库管理系统上，它是专门为多用户的分散应用设计的，并且使用了统一的基于对象的结构，因此提供了系统的高可用性。分布式的实时数据库以优先级顺序的方式提供了内在的容错特性，允许将冗余的数据对象配置在多个服务器/工作站上。I/A SCADA系统支持多个并发的数据库实例，允许多个实例同时运行、仿真、测试和开发。

　　I/A SCADA数据库提供了关系数据库管理系统的功能，但是消除了关系数据库中的关系联结(关系联结是影响关系数据库性能的问题)，因此获得高度实时的系统性能。数据库可以扩展到1，000，000个对象，在连续操作的条件下提供了高可靠性、灵活性和可用性。I/A SCADA数据库的数据还可以实时映射到ORACLE数据库中。

　　to schedule these patching tasks around process activities rather than always immediately deploying the updates."The DeltaV system combines the rings of pro

　　tection, in which an intruder must get past successive layers of protection devices, with defense in depth, consisting of protections enabled within the security rings. The DeltaV network sits at the center of protection layers that provide as much system isolation as possible from attacks originating in the plant LAN network space. The basic security strategy for any automation system is to manage user and network access to the syste

　　m to protect the controller from attack.About WurldtechWurldtech Security Technologies, headquartered in Vancouver, BC, Canada, is the leading provider of security solutions to SCADA, process control and mission-critical industries. Founded in 2006 based on research conducted at the British Columbia Institute of Technology (BCIT), Wurldtech is committed to delivering breakthrough products and services that he

　　lp protect global critical infrastructure and address the security needs of major industrial organizations and government agencies worldwide.About Emerson Process ManagementEmerson Process Management, an Emerson business, is a leader in helping businesses automate their production, processing and distribution in the chemical, oil and