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    • 125. 发明授权
    • Protection against communications crosstalk in a factory process control
system
    • 防止工厂过程控制系统中的通信串扰
    • US5917840A
    • 1999-06-29
    • US851977
    • 1992-03-13
    • M. Charles CheneySimon KorowitzWilliam M. SlechtaNathan H. Tobol
    • M. Charles CheneySimon KorowitzWilliam M. SlechtaNathan H. Tobol
    • H04L1/00G06F11/10H03M13/00
    • H04L1/0061H04L1/0086
    • A method for transmitting messages between a communications controller and devices in a factory process control system, wherein each device has an associated identification number which is unique to that device. A message to be transmitted is compiled, and then based on the criticality of the message, one of a standard, secure, or critical message protocols is chosen for the message; each protocol being defined to generate a message checksum for the message in a manner different from the other protocols. The generated checksum is then included in the message. Using the secure and critical protocols, a message checksum is generated from the message to be transmitted and the identification number of the intended recipient device. In the secure protocol, the message checksum is included in the message, but the identification number is not included in the message; in the critical protocol, both the message checksum and the identification number are included in the message. A crosstalk query message may be sent from the controller to determine if a link of a factory process control system is susceptible to crosstalk. The controller sends to a link on which a particular device is known to reside a diagnostic message indicating the identification number of the particular device and requesting any other devices that unintentionally receive the message to transmit a response message to the communications controller.
    • 一种用于在通信控制器和工厂过程控制系统中的设备之间传送消息的方法,其中每个设备具有该设备唯一的相关联的标识号。 要发送的消息被编译,然后基于消息的关键性,为消息选择标准,安全或关键消息协议之一; 每个协议被定义为以不同于其他协议的方式为消息生成消息校验和。 生成的校验和然后包含在消息中。 使用安全和关键的协议,从要发送的消息和预期接收方设备的标识号生成消息校验和。 在安全协议中,消息中包含消息校验和,但标识号不包括在消息中; 在关键协议中,消息中包括消息校验和和标识号。 可以从控制器发送串扰查询消息,以确定工厂过程控制系统的链路是否易于串扰。 控制器发送到特定设备已知的链路,其驻留有指示特定设备的标识号的诊断消息,并且请求无意地接收消息的任何其他设备向通信控制器发送响应消息。