| 摘要 |
A distributed monitoring method, which can be used in a security system, a fire prevention system, transformer stations, base stations for mobile communication and places for internal management of many kinds of facilities, uses a controller and at least two field devices, and the communication between the controller and the field devices is by way of a fieldbus. A signal frame transmitted therein includes a field device address segment, a field device subaddress segment, a read/write flag segment, a data exchange segment between the controller and a field device and a reporting request by a field device to the controller. If none of the field devices detects any abnormal event, the controller performs inspection of all the field devices in turn; when one of the field devices finds an abnormal event, this field device sends a reporting request to the controller. It is possible to reduce the system's power consumption by setting a different power status for the field devices.
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