对于需要与ISA S84.01-1996中描述的安全仪表系统相当的极高可用性的应用,3500系列机械保护系统支持三模块冗余(TMR)继电器模块。TMR
继电器模块使用三个独立的继电器来驱动单个继电器输出。TMR继电器模块与一个特殊的TMR机架接口模块和三个监视器模块-起工作, 为输入提
供三选二表决。
TMR继电器模块上使用的每个继电器都包括“报警驱动逻辑”。报警驱动逻辑是使用AND和OR逻辑编程,且可以利用来自机架中任何监视器通道
或监视器通道的任何组合的报警输入(警报和危险)。此报警驱动逻辑编程使用3500机架配置软件来满足应用的特定需求。
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