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AssigneeHitachi, Ltd.
InventorsKazuhiko Miura, Shoei Takahashi, Kazuyasu Asakura, Yoshio Maruyama, Katsuhito Shimizu, Yukiko Mori, Tohru Akatsu
Estimating the term…
A multiplexing control system has a common process input/output unit for distributing process signals from sensors for measuring the same state variable of a process to digital controllers. One process input/output unit for inputting/outputting a process signal between the multiplexing control system and plant is provided for each process signal. The process input/output unit for the process signal of high importance is triplexed. A process controller having an operating function is provided to each of the triplexed process input/output units. A process input/output unit for the process signal of intermediate importance is diplexed. A process input/output unit for the process signal of low importance is monoplexed. The process signals of the diplexed process input/output units and the monoplexed process input/output unit are controlled by a controller having a master right among the process controllers.
A multiplexing control system characterized by comprising plural sensors which detect a same state variable in a process;
A multiplexing control system including a plural microcomputers for controlling a plant and a process input/output unit, characterized in that a single process input/output unit is connected to the plural microcomputers via plural interface boards.
A multiplexing control system in which process input/output units which input/output process signals are provided for every process signal, characterized in that a redundancy structure of each of the process input/output units which inputs/outputs a concerned process signal is varied depending on the type of the process signals and further a signal of a process input/output unit having small redundancy is designed to be inputted/outputted via a process input/output unit having large redundancy.
A multiplexing control system in which process input/output units which input/output process signals are provided for every process signal, characterized in that the process signal of a “high” importance is triplexed as well as a process controller having a processing function is provided for each of the triplexed input/output units, the process input/output unit for the process signal of an “intermediate” importance is diplexed, the process input/output unit for the process signal of a “low” importance is monoplexed as well as the output of the respective process signals of the diplexed input/output unit and the monoplexed input/output unit is designed to be processed by either of the process controllers.
A multiplexing method of a control system in which process input/output units which input/output process signals are provided for every process signal, characterized in that the redundancy structure of the input/output units for inputting and outputting process signals are either triplexed, diplexed or monoplexed depending on importance of the process signals.
Dependencies are inferred from the claim text.