| 摘要 |
<p>An information network to which centralized interaction devices for monitoring and controlling the operation of a plurality of plants and individual interaction devices for monitoring and controlling each plant are connected, and a control network to which controllers and the individual interaction devices are connected are connected via gateway means. When a significant change in the plant is detected, the controllers transmit the state to the control network as Tag in a multicast mode. The centralized interaction devices and the individual interaction devices transmit inquiries about a plant state to the control network in a multicast mode and updates the responses from the controllers.</p> |
