JPH1090250A - Transmission method for distributing water quality monitor measuring value data in water quality control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the lapse time variation of a measuring value in a sub-station (distributing water quality monitor), at a master station, at the time not only when an abnormal condition is generated, but also when a variation more than an allowable variation is generated. SOLUTION: When a calling from a master station is received (S3 YES), the transmission of the measuring data (S6, S7) is carried out until a master station circuit is cut off (S8 NO → YES), and when an abnormal condition is generated in a sub-station (S4 YES), the master station is called (S5), the transmission of the measuring data ia carried out (S1 to S11) until the master station circuit is cut off (S8 NO → YES), in this system. In such a system, a means S41 to compare the deflection between the newest measuring data Xn at the sub-station and the data Xn-1 before one step, and an allowable deflection, is provided, and when the deflection of the data is made larger than the allowable deflection, the master station is called (S5), and the transmission of the measuring data (S6, S7) is carried out until the master station circuit is cut off (S8 NO → YES).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for transmitting water quality measurement data from a distribution water quality monitoring road station installed on a water distribution network to a central monitoring and control device such as a water purification plant in a water quality management system. The present invention relates to a method for transmitting measured water distribution water quality measurement data in a water quality management system that performs data transmission by intermittent connection communication using a general public line and a modem with an NCU (network control device) function.

[0002]

2. Description of the Related Art In a water quality management system, a station on a distribution water quality monitor (slave station) installed on a distribution network is located several kilometers away from a central monitoring and control device (master station) such as a water purification plant. It is difficult for a person to go around the slave stations one by one and collect the measurement data.

Therefore, as one conventional method, a data transmission method using a general public line and a modem with an NCU function is used. FIG. 7 shows the configuration of the water quality management system.

Referring to FIG. 7, 1 is a master station, 2 and 3 are modems [1] and [2], 4 is a general public line, 5 is a water distribution network, 6 is a slave station, and 7 is a water purification plant (center). The master station 1 is installed in a water purification plant 7.

A data transmission method for normal data will be described with reference to FIG. The distribution water quality measurement data continuously measured (S1) by the slave stations 6 installed so as to be scattered on the distribution pipe network 5 is held at regular intervals (S2) and installed at the center 7 The called master station 1 makes a telephone call to the slave station 6 using the modem [1] and the general public line 4 periodically or irregularly, connects the communication line, and calls the slave station. When called and confirmed (S3Y), the slave station transmits the held data toward the master station (S6, S7).

There is no call from the master station (S3N
If an abnormality such as an abnormality in a measured value or a failure of the child station occurs in the child station of O) (S4), the abnormal child station calls the modem (2) to call the master station. (S
5), and transmit the data held from the slave station (S6, S
7) The measurement value data is continuously transmitted to the master station until the master station disconnects the line (S8 YES) (S9, S7).
In the data transmission, in both normal and abnormal cases, the disconnection of the line from the master station is confirmed (S8 YES), the data transmission is terminated (S10), the measured value data is deleted (S11), and the processing is terminated.

FIG. 9 shows an image of transmission data by the above data transmission method. In FIG. 9, the horizontal axis represents the elapsed time, the vertical axis represents the water quality measurement value in the slave station, X is the number of communications by calling from the master station during normal times, t is the data sampling period in the slave station, and T is the normal master time. Indicates the slave station call cycle from the station.

[0008]

In the above conventional method,
Only when calling a slave station from the master station or when an error occurs, the latest value will enter the master station, so once communication ends, the abnormal value must be exceeded until the next communication starts. Unless this is the case, changes in the water quality measurement data cannot be grasped. That is, in the data transmission method using the NCU function modem, since the line connection between the master station and the slave station is intermittent, there is a problem that a change in the water quality measurement value cannot be grasped at any time by the master station.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method of measuring a time change of a measured value in a slave station not only when an abnormality occurs, but also when a change exceeding an allowable deviation. It is an object of the present invention to provide a method for transmitting distribution water quality monitor measurement value data in a water quality management system in which a master station can confirm measurement values before and after the occurrence of the occurrence.

[0010]

According to the present invention, when a call from the master station is received, the measured value data is transmitted until the master station line is disconnected, and when an abnormality occurs in the slave station, the master station is called to disconnect the master station line. In the method of transmitting measured water data using a modem with an NCU function in a water quality management system that transmits measured data up to, the measured value is allowed except when an abnormality occurs in the distribution water quality monitor that is a slave station. Even when a change equal to or larger than the deviation is indicated, the master station is called and the measured value data is transmitted. In this case, all measured value data stored after the previous line disconnection in the slave station is compared with the latest measured value data, and even a time change of the measured value longer than the sampling period is detected as a change larger than the allowable deviation. Good.

[0011] Alternatively, in addition to the occurrence of an abnormality in the distribution water quality monitor serving as a slave station, when the line is disconnected even when the abnormality is recovered, the master station is called and the measured value data is transmitted.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment FIG. 1 shows a flow of a method for transmitting distribution water quality monitor measured value data according to a first embodiment, and FIG. 2 shows an image of transmission data by the transmission method.

In FIG. 1, X in step S41
_n is the latest measured data, X _n-1 is the latest measured data X
Measurement value data immediately before _n , △ indicates an allowable deviation. In FIG. 2, the horizontal axis represents the elapsed time, the vertical axis represents the water quality measurement value in the slave station, x is the number of communications by calling from the master station in normal times, t is the data sampling period of the slave station,
T indicates the calling cycle of the slave station from the master station, and △ indicates the allowable deviation.

Data transmission of the water quality management system (FIG. 7) is performed according to the flow of FIG. The difference from the conventional FIG.
That is, 1 is added.

(1) Normal operation Normal operation is similar to the conventional case of FIG. 8, in which the slave station is called at every slave station calling cycle T of the master station (S3), and the measurements collected by the slave stations (S1, S2). The value data is transmitted from the slave station using the modem [1] and the general public line (S6, S
7).

(2) At the time of measuring a change exceeding the permissible deviation There is no call from the master station and no occurrence of abnormality (S3NO,
S4NO), if it is determined in S41 that the difference between the latest measured value _Xn and the previous measured value _{Xn-1 has} exceeded the allowable error を, the modem [2] of the master station is switched off in the same manner as in the conventional case of abnormality. After calling (S5) from the slave station and transmitting the measured value data collected (S1, S2) at the slave station (S6, S7), the measured value data is transmitted at any time until the line is disconnected at the master station (S8 NO → YES). Transmit (S9, S7) ("1" to
"3").

Embodiment 2 FIG. 3 shows a flow of transmission water quality measurement value data transmission, and FIG. 4 shows an image of transmission data by the transmission method. In FIG. 3, X _n is the most recent measurement data in step S43, X _m is the previous communication at the end after the measured value data collected to the latest measurement values, △ denotes the allowable deviation, respectively.
In FIG. 4, the horizontal axis represents the elapsed time, the vertical axis represents the water quality measurement value in the slave station, x is the number of communications by calling from the master station during normal times, t is the data sampling cycle of the slave station, and T is the master station's data sampling period. Only the slave station calling cycle, △ indicates the allowable deviation.

Data transmission of the water quality management system (FIG. 7) is performed according to the flow of FIG. The difference from the conventional FIG.
This is the point where the processing of 2 to S45 has been added.

(1) Normal operation Normal operation is similar to the conventional case of FIG. 8, in which the slave station is called at every slave station calling cycle T of the master station, and the measured value data collected by the slave station is transmitted to the modem [1] and the modem [1]. Using a public telephone line,
Transmit from slave station.

(2) At the time of measuring a change exceeding the allowable deviation When there is no call from the master station and no abnormality has occurred (S3N
O, S4NO), and the determination of | X _n -X _nm | ≧ △ is performed in S43. N This determination is the latest measured value X _n, whether the difference between the measured value X _m so far exceeds the allowable deviation △ from m = 1
The determination is performed while increasing m one by one until ≧ n (S42).
To S45). If the difference between the X _n and X _m exceeds △, call from the slave station modem [2] of the master station as well as abnormal in the conventional view 8 (S5), collected by the slave station (S1, S2) After transmitting the measured value data (S6, S7), the measured value data is transmitted at any time until the master station disconnects the line (S8 NO → YES) (S9, S7) (“1” in FIG. 4,
"3").

Embodiment 3 FIG. 5 shows a flow of a method of transmitting measured water quality monitor measured value data, and FIG. 6 shows an image of transmission data by the transmission method. The difference between FIG. 5 and FIG.
41 'is that the judgment of the occurrence of the abnormality and the judgment of the recovery from the abnormality can be made.

(1) Normal operation In the normal operation, a slave station is called in the same manner as in the conventional case of FIG. 8, and the slave station transmits collected measurement data from the slave station using the modem [1] and a general public line.

[0023] (2) whether as in the case of change exceeds the allowable deviation of the measurement time of FIG. 3, the difference between the latest measured values X _n and the measured value X _m of far in S43 exceeds the allowable deviation △ If the value exceeds the allowable value, the modem [2] of the master station is called from the slave station, and the data collected by the slave station is transmitted. Until the disconnection, the measurement value data is transmitted as needed.

(3) When an error occurs If the master station has already been called in S5 before and after the occurrence of the abnormality, the line is cut off at the master station (S8 NO → YES).
The measurement value data is transmitted as needed (S6, S7) ("1", "3" in FIG. 6).

If the line is disconnected in the abnormal state, the modem [2] of the master station is called from the slave station at the time of recovery from the error (S4'YES) (S5), and collected by the slave station (S5).
After transmitting the measured data (1, S2), the measurement data is transmitted as needed (S6, S7) until the master station disconnects the line (S8 NO → YES) (“5” in FIG. 6).

[0026]

Since the present invention is configured as described above, the following effects can be obtained.

(1) The time change of the measured value in the slave station is
Not only when an abnormality occurs but also when a change exceeding the allowable deviation occurs, the master station can check the measured values before and after the change.

(2) shorter than the calling cycle from the master station,
Even for a time change of the measured value longer than the data sampling cycle of the slave station, the time required for confirmation by the master station can be reduced.

(3) Calling the master station from the slave station not only at the time of occurrence of an error but also at the time of recovery from the error, the master station can temporarily disconnect the line even when the slave station is in an error state.

(4) The line connection time in one communication can be reduced by the above (3).

(5) As a result, the communication cost per operation can be reduced.

(6) Also, it is possible to respond more quickly to a call from another abnormal child station.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a method of transmitting water distribution monitor measurement value data according to the first embodiment.

FIG. 2 is a graph showing an image of transmission data according to the same method.

FIG. 3 is a flowchart showing a method for transmitting water distribution monitor measurement value data according to the second embodiment;

FIG. 4 is a graph showing an image of transmission data according to the same method.

FIG. 5 is a flowchart showing a method for transmitting distribution water quality monitor measurement value data according to the third embodiment.

FIG. 6 is a graph showing an image of transmission data according to the same method.

FIG. 7 is a configuration diagram of a water quality management system.

FIG. 8 is a flowchart showing a conventional method of transmitting water distribution monitor measurement value data.

FIG. 9 is a graph showing an image of transmission data according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Central monitoring and control apparatus (master station) 2 ... Modem (1) 3 ... Modem (2) 4 ... General public line 5 ... Water distribution pipe network 6 ... Water quality monitor (slave station) 7 ... Water purification plant (central).

Claims (3)

[Claims] When a call is received from a master station, measurement value data is transmitted until the master station line is disconnected, and when an abnormality occurs in the slave station, the master station is called and the measurement value data is transmitted until the master station line is disconnected. In the transmission method of distribution water quality measurement data using a modem with NCU function in the water quality management system, the distribution water quality monitor which is a slave station,
A method for transmitting measured water data in a water quality management system in a water quality management system, wherein a master station is called to transmit measured value data even when the measured value shows a change larger than an allowable deviation. 2. The apparatus according to claim 1, wherein all measured value data stored since the previous line disconnection in the slave station and the latest measured value data are compared, and a time variation of the measured value longer than the sampling cycle is allowed. A method for transmitting distribution water quality monitor measurement value data in a water quality management system, wherein the above-described change is captured, and a master station is called to transmit measurement value data. 3. When a call from the master station is received, the measured value data is transmitted until the master station line is disconnected, and when an abnormality occurs in the slave station, the master station is called and the measured value data is transmitted until the master station line is disconnected. In the transmission method of distribution water quality measurement data using a modem with NCU function in the water quality management system, the distribution water quality monitor which is a slave station,
A method for transmitting measured water value data in a water quality management system in a water quality management system, wherein a measured value data is transmitted by calling a master station when a line is disconnected even after an abnormal recovery.