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    • 4. 发明授权
    • Function block implementation of a cause and effect matrix for use in a process safety system
    • 功能块实现用于过程安全系统的因果矩阵
    • US06898468B2
    • 2005-05-24
    • US10401655
    • 2003-03-28
    • Michael OttGary LawDennis StevensonRobert HavekostJulian NaidooGodfrey R. Sherriff
    • Michael OttGary LawDennis StevensonRobert HavekostJulian NaidooGodfrey R. Sherriff
    • G05B9/02G05B11/01
    • G05B9/02
    • A cause and effect function block, which can be easily integrated into a function block diagram programming environment in a process plant safety system to implement the cause and effect logic specified by a traditional cause and effect matrix, includes a set of cause inputs and a set of effect outputs. A multiplexer within the cause and effect function block receives each of the cause inputs and is coupled to one or more state machines, with a separate state machine existing for each effect output. The multiplexer decodes each of the cause inputs and, based on the cause inputs and previously identified cause and effect matrix logic, provides a trip signal to one or more of the state machines. Upon receiving a trip signal, a state machine forces an associated effect output into a tripped or safe state. If desired, the state machine may then use one or more other signals, such as signals from a user or from the process, to transition between a set of different states used to safely return the process plant back to the normal operating state from the tripped or safe state.
    • 一个因果函数块,可以轻松地集成到一个过程工厂安全系统的功能框图编程环境中,以实现由传统因果矩阵指定的因果逻辑,包括一组原因输入和一组 的效果输出。 原因和效果功能块内的多路复用器接收每个原因输入,并且耦合到一个或多个状态机,其中存在用于每个效果输出的单独的状态机。 多路复用器解码每个原因输入,并且基于原因输入和先前识别的因果矩阵逻辑,向一个或多个状态机提供跳闸信号。 在接收到跳闸信号时,状态机强制相关联的效果输出进入跳闸或安全状态。 如果需要,状态机可以然后使用一个或多个其他信号,例如来自用户或来自过程的信号,以在用于将处理设备安全地从处理器返回到正常操作状态的一组不同状态之间转换 或安全状态。
    • 5. 发明申请
    • DISTRIBUTED EQUIPMENT ARBITRATION IN A PROCESS CONTROL SYSTEM
    • 分布式设备在过程控制系统中的仲裁
    • US20100185801A1
    • 2010-07-22
    • US12356385
    • 2009-01-20
    • Godfrey R. SherriffGary K. Law
    • Godfrey R. SherriffGary K. Law
    • G06F13/18
    • G05B19/41865G05B2219/32079G05B2219/32328Y02P90/20
    • A distributed process control equipment ownership arbitration system and method for arbitrating equipment ownership conflicts are disclosed. Individual control modules representing various process control entities within a process control system define a plurality of lists or queues for storing equipment arbitration information. Requests by one process control entity to acquire ownership over another process control entity are represented by an arbitration token that represents the ownership relationship sought by the acquiring process control entity. Copies of the arbitration token are communicated between the respective control modules and stored in the various arbitration queues defined by the control modules, depending on the status of the acquisition request. Upon receiving an acquisition request from another process control entity, the control module associated with the targeted process control entity decides whether the targeted process control entity is available to be acquired by the requesting control entity based on arbitration rules that are embedded within the control module itself. Once the targeted process control entity has been acquired by another process control entity it may not be acquired by any other process control entity until it has been released by the acquiring process control entity.
    • 披露了分布式过程控制设备所有权仲裁系统和仲裁设备所有权冲突的方法。 表示过程控制系统内的各种过程控制实体的各个控制模块定义用于存储设备仲裁信息的多个列表或队列。 一个过程控制实体对另一过程控制实体获取所有权的请求由代表获取过程控制实体所寻求的所有权关系的仲裁令牌来表示。 仲裁令牌的副本在相应的控制模块之间通信,并且根据获取请求的状态存储在由控制模块定义的各种仲裁队列中。 在从另一个进程控制实体接收到获取请求时,与目标进程控制实体相关联的控制模块基于嵌入在控制模块本身内的仲裁规则来决定目标进程控制实体是否可被请求控制实体获取 。 一旦目标过程控制实体已被其他过程控制实体获取,则在获取过程控制实体已被释放之前,其可能不被任何其他过程控制实体获取。