Data acquisition method in centralized remote-supervisory system and apparatus used therefor

Claim 2

A centralized remote-supervisory system comprising a central processing unit, a plurality of terminal units connected to the central processing unit, and at least a sensor connected to each of the terminal units, wherein said central processing unit comprises means for providing a criterion value corresponding to each of a plurality of time zones and means for transmitting said criterion value to each of said terminal units; and wherein each of said terminal units comprises means for selecting the data detected by said sensor using said criterion value, and means for transmitting said selected data to said central processing unit based on said criterion value corresponding to each of said plurality of time zones.

Claim 3

A centralized remote-supervisory system as recited in claim 1, wherein said means for selecting the detected data further comprises means for obtaining a differential between a current detected data and a previously detected data and means for comparing the differential with a threshold level which is obtained by calculation using said criterion value.

Claim 4

A centralized remote-supervisory system as recited in claim 2, wherein said detected data is transmitted to the central processing unit when said differential is larger than said threshold level.

Claim 5

A centralized remote-supervisory system as recited in claim 2, wherein said selection of the detected data is done at regular intervals.

Claim 6

A centralized remote-supervisory system as recited in claim 2, wherein said transmission of the detected data is done at regular intervals.

Claim 7

A centralized remote-supervisory system as recited in claim 2, wherein said threshold level is the same as said criterion value transmitted from the central processing unit corresponding to each of said time zones.

Claim 8

A centralized remote-supervisory system as recited in claim 2, wherein said criterion value is a multiplication factor and said threshold level is obtained by multiplying a predetermined quantity by said criterion value.

Claim 9

A centralized remote-supervisory system as recited in claim 1, wherein said system comprises sensors for controlling building facilities including any one selected among an air-conditioner, an illumination equipment and an aqueduct equipment.

Claim 10

A centralized remote-supervisory system as recited in claim 8, wherein said system comprises a sensor for detecting temperature for an air-conditioning equipment.

Claim 11

A centralized remote-supervisory system as recited in claim 1, wherein said system comprises a sensor for detecting a water level in a dam facility.

Claim 12

A centralized remote-supervisory system as recited in claim 10, wherein said sensor detects water storage capacity in a dam power station.

Claim 13

A centralized remote-supervisory system comprising a central processing unit, a plurality of terminal units connected to the central processing unit, and at least a sensor connected to each of the terminal units, wherein said central processing unit comprises means for storing a time zone in which delay in data processing is anticipated, and means for transmitting a criterion value to each of said terminal units when the system enters into said time zone, the criterion value being set up for said time zone; and wherein each of said terminal units comprises means for storing a current detected data and a previously detected data by said sensor, and means for obtaining a differential between said current and previously detected data, and means for comparing whether said differential is larger than a threshold level obtained using said criterion value corresponding to each of said plurality of time zones, and means for transmitting said current detected data to the central processing unit when said differential is larger than the threshold level, and means for replacing said stored previously detected data with the current detected data when the current detected data is transmitted to the central processing unit.

Claim 14

A centralized remote-supervisory system comprising a central processing unit, a plurality of terminal units connected to the central processing unit, and at least a sensor connected to each of the terminal units, wherein said central processing unit comprises means for storing a time zone in which delay in data processing is anticipated, and means for transmitting a criterion value to each of said terminal units when the system enters into said time zone, the criterion value being set up for said time zone; and wherein each of said terminal units comprises means for storing a current detected data and a previously detected data by said sensor, and means for obtaining a differential between said current and previously detected data, and means for comparing whether said differential is larger than a threshold level obtained using said criterion value corresponding to each of said plurality of time zones, and means for transmitting said current detected data to the central processing unit when said differential is larger than the threshold level, and means for replacing said stored previously detected data with the current detected data when the current detected data is transmitted to the central processing unit.

Claim 15

A centralized remote-supervisory system as recited in claim 12, wherein said threshold level is the same as said criterion value transmitted from the central processing unit corresponding to said time zones.

Claim 16

A centralized remote-supervisory system as recited in claim 12, wherein said criterion value is a multiplication factor and said threshold level is obtained by multiplying a predetermined quantity by said criterion value.

Claim 17

A data acquisition method in a centralized remote-supervisory system, wherein said system comprises a central processing unit and a plurality of terminal units connected to the central processing unit, each terminal unit comprising at least a sensor, said method comprising the steps of: (a) storing a plurality of time zone data and a plurality of criterion values corresponding to each of said time zones in the central processing unit; (b) transmitting said criterion value from the central processing unit to each terminal unit each time when the system enters into said time zone; (c) storing a current detected data and a previously detected data by said sensor; (d) calculating a differential between said current and previously detected data; (e) comparing said differential with a threshold level, the threshold level being obtained by calculation using said criterion value corresponding to each of said plurality of time zones; and (f) transmitting said current detected data to the central processing unit only when said differential is larger than said threshold level, and replacing said stored previously detected data with said current detected data when said current detected data is transmitted to the central processing unit.

Claim 18

A data acquisition method in a centralized remote-supervisory system, wherein said system comprises a central processing unit and a plurality of terminal units connected to the central processing unit, each terminal unit comprising at least a sensor, said method comprising the steps of: (a) storing a plurality of time zone data and a plurality of criterion values corresponding to each of said time zones in the central processing unit; (b) transmitting said criterion value from the central processing unit to each terminal unit each time when the system enters into said time zone; (c) storing a current detected data and a previously detected data by said sensor; (d) calculating a differential between said current and previously detected data; (e) comparing said differential with a threshold level, the threshold level being obtained by calculation using said criterion value corresponding to each of said plurality of time zones; and (f) transmitting said current detected data to the central processing unit only when said differential is larger than said threshold level, and replacing said stored previously detected data with said current detected data when said current detected data is transmitted to the central processing unit.

Claim 19

A data acquisition method as recited in claim 15, wherein said criterion value in step (a) is the same as said threshold level in step (d), and no calculation is necessary for obtaining the threshold level in step (d).

Claim 20

A data acquisition method as recited in claim 15, wherein said threshold level is obtained by multiplying a predetermined quantity by said criterion value.

Claim 21

A data acquisition method as recited in claim 15, wherein said criterion value set up for the time zone in which data detected by the sensor shows a rapid change is selected to be larger than those for other time zones.