JP2560531B2 - Data transmission method in centralized monitoring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is a centralized monitoring system that controls terminal devices such as air conditioners and lights installed in buildings and factories based on measurement values measured by measurement sensors. More particularly, the present invention relates to a data transmission method in a centralized monitoring device when distributing a measurement value measured by a measurement sensor to locations used for control.

[Conventional technology]

Conventionally, as shown in FIG. 3, a centralized monitoring device of this type has a main control unit 31 and a keyboard or CRT connected to the main control unit 31.
Terminal devices 32 such as, relays 33-1, 33-2 connected to the main control unit 31 via a transmission line 38, and transmission lines 39-1, 39-to the relays 33-1, 33-2. Terminal devices 35-1, 35 connected via 2
-2,35-3,35-4, and connect the measurement sensor 36 for measuring the temperature and humidity in the factory etc. to the nearest terminal device 35-4 and control target equipment such as air conditioner and lighting. Terminal 37
-1,37-2,37-3 were connected to terminal devices 35-1,35-2,35-3 which control them based on the measurement data. Then, in the main control unit 31, provided is a table that stores, for each measurement point by the measurement sensor 36, the terminal device name that refers to the measurement data at the measurement point, and the main control unit 31 causes the transmission path 38 and the repeater 33
2, the measurement value of each measurement point by the measurement sensor 36 is periodically collected via the transmission path 39-2 and the terminal device 35-4, and the collected measurement data is referred to by the table of the terminal device 35-1. ~
35-3 includes a transmission line 38, repeaters 33-1, 33-2, transmission lines 39-1, 39
-2 was being sent.

[Problems to be Solved by the Invention]

Conventionally, as described above, the measurement data of the measurement sensor 36 is used as the terminal device 35-1 for controlling the terminals 37-1 to 37-3.
It has been distributed to ~ 35-3, so the following problems existed.

(1) Since the measurement data is once collected in the main control unit 31 and distributed from the main control unit 31 to each place, if the main control unit 31 stops its operation due to a failure or the like, distribution of all the measurement data will be stopped. .

(2) Since the measurement data is once collected in the main control unit 31 and is distributed to each place from here, the transmission delay time until the measurement data reaches the intended place becomes large, and the total traffic on the transmission path is increased. The amount increases.

The present invention has solved such conventional problems,
The purpose is to avoid stopping the distribution of all measurement data due to a failure at a specific location, and to suppress the transmission delay time required for distribution of measurement data and the overall traffic volume on the transmission path. It is to provide a data transmission method in a centralized monitoring device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a main control unit, a plurality of repeaters connected to the main control unit via transmission lines, and a plurality of terminal control units connected to each repeater via transmission lines. And a terminal device that is a control target device connected to each terminal control unit, and a measurement sensor, and distributes the measurement value measured by this measurement sensor to the terminal control unit that is referencing it. In the data transmission system in the centralized monitoring device that controls the terminal connected to the own terminal control unit based on the distributed measurement value, the unit uses the measurement sensor between the measurement sensor and the nearest repeater. It has a reference specification table that holds the presence or absence of reference specification for each measurement point, acquires the measurement value of each measurement point by the measurement sensor, and the acquired measurement value is the measurement value applied to the measurement point with reference specification. If there is As a result, it is possible to provide an arithmetic unit for transmitting data including the measurement point information, the information with reference designation and the measured value to the nearest repeater, and to transmit the measurement point information to each repeater. A transmission control table indicating the correspondence with the destination information is provided, and when each of the relays receives the data including the measurement value, when the data includes the information with the reference designation, the data is included in the data. The transmission destination information corresponding to the included measurement point information is acquired from the transmission control table, and the received data is transmitted to the destination indicated by the acquired transmission destination information.

Further, in a preferred embodiment of the present invention, the arithmetic device has a configuration for acquiring the measurement value of each measurement point by the measurement sensor at a constant cycle, and when a plurality of measurement sensors are provided, the arithmetic device is The configuration provided for each measurement sensor is adopted.

[Action]

In the data transmission method in the centralized monitoring device of the present invention, a reference designation table in which an arithmetic unit provided between the measurement sensor and the nearest repeater holds the presence or absence of reference designation for each measurement point by the measurement sensor. The measurement value of each measurement point by the measurement sensor is acquired in a constant cycle, and the acquired measurement value is the measurement value applied to the measurement point with reference specification. Upon the determination, the data including the measurement point information, the information with reference designation, and the measurement value is transmitted to the nearest repeater. Each repeater has a transmission control table showing the correspondence between the measurement point information and the destination information, and when the repeater connected to the arithmetic unit receives the data including the measurement value, there is a reference designation in this data. Information is included in the data, the destination information corresponding to the measurement point information included in the data is acquired from the transmission control table in the local repeater, and the destination indicated by the acquired destination information, for example, The received data is transmitted to the terminal control unit connected to the repeater or another repeater. The repeater that receives the data including the measurement value relayed from another repeater also performs the same operation, whereby the measurement value of the measurement sensor is distributed to the desired terminal control unit without passing through the main control unit. It

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the configuration of a centralized monitoring apparatus to which the data transmission system of one embodiment of the present invention is applied. As shown in the figure, the centralized monitoring apparatus includes a main control unit 1, a terminal device 2 such as a keyboard and a CRT connected to the main control unit 1, and a repeater connected to the main control unit 1 via a transmission line 8. 3-1, 3-2 and repeater 3
-1 via the transmission line 9-1 to the terminal control unit 5-
1, 5-2, and a terminal control unit 5-3 and an arithmetic unit 4 which are connected to the repeater 3-2 via a transmission line 9-2. The arithmetic unit 4 is provided with temperature and humidity in a factory or the like. A measurement sensor 6 for measuring, for example, is connected to each of the above-mentioned terminal control units 5-1 to 5
-3 is a terminal device 7-1 to 7- that is a control target device such as an air conditioner.
3 is connected.

The main control unit 1 is a unit that performs the main control of the centralized monitoring apparatus as a whole, and controls various data input from an operator through the terminal device 2, for example, the terminal control units 5-1 to 5-3 and the arithmetic unit 4. Data is transmitted through the transmission line 8, the repeater 3-1,
Controlled by transmitting to the corresponding terminal control unit or arithmetic unit 4 via 3-2 and transmission lines 9-1, 9-2, and collecting the state data of each unit, etc. by the route opposite to the above. And terminal device 2
It has the function of outputting to the operator through.

The repeaters 3-1 and 3-2 have a function of relaying the data received from the main control unit 1 to the terminal control units 5-1 and 5-2, the terminal control unit 5-3 and the arithmetic unit 4, and vice versa. Control unit 5
-1 and 5-2, a function of relaying the data transmitted from the terminal control unit 5-3 and the arithmetic unit 4 to the main control unit 1, and a transmission control table indicating the correspondence between the measurement point information and the destination information. When the data including the measured value is received and the information with reference designation is included in the data, the transmission control table is set to the destination information corresponding to the measurement point information included in the data. It further has a function of transmitting the received data to the destination indicated by the acquired transmission destination information. Further, in particular, the repeater 3-2 receives the data received from the arithmetic unit 4 via the transmission line 9-2 to the terminal control unit 5-3 under its own repeater 3-2 via the same transmission line 9-2. It has the function of relaying.

The arithmetic unit 4 has a reference designation table that holds the presence or absence of reference designation for each measurement point by the measurement sensor 6, acquires the measurement value of each measurement point by the measurement sensor 6 at regular time intervals,
By knowing from the contents of the reference specification table that the acquired measurement value is the measurement value related to the measurement point with reference designation, the data including the measurement point information, the information with reference designation, and the measurement value is relayed. It has a function of transmitting to the device 3-2.

The functions of the terminal control units 5-1 to 5-3 are almost the same as the functions of the terminal devices 35-1 to 35-3 in FIG. Terminals 7-1 to 7
-3 is controlled.

Now, for convenience of explanation, the measurement points by the measurement sensor 6 are set to a, b,
There are four values c and d, and the measurement value at the measurement point a is the terminal control unit 5-1.
, The terminal control unit 5-2 refers to the measurement value of the measurement point b, the terminal control unit 5-3 refers to the measurement value of the measurement point c, and the measurement value of the measurement point d is not referred to in any case. I shall. In such a case, the reference designation table in the arithmetic unit 4 holds the information with reference designation corresponding to the measurement points a to c, and the information without reference designation corresponding to the measurement point d. In addition, the transmission control table in the repeater 3-2 includes
The information with the repeater 3-1 as the transmission destination corresponding to the measurement points a and b is
Information that the destination is the terminal control unit 5-3 is held corresponding to the measurement point c, and the transmission control table in the repeater 3-1 sets the terminal control unit 5-1 as the transmission destination corresponding to the measurement point a. Information
Information that has the terminal control unit 5-2 as a transmission destination corresponding to the measurement point b is held. Then, in such a case, regarding the distribution of the measurement values of the measurement sensor 6, the arithmetic unit 4 and the repeaters 3-1, 3-1.
3-2 performs the following operations.

First, when the measurement value collection period arrives, the arithmetic unit 4 acquires the measurement value of the measurement point by the measurement sensor 6 as shown in FIG. 2 (21), and this measurement value refers to the measurement point with reference designation. The internal reference specification table is used to check whether or not the measured value is (22). If the measurement point without reference designation, that is, the measurement value of the measurement point d in the present example, terminates the process, but if the measurement point has reference designation, that is, the measurement values of measurement points a to c, Repeater 3-2 connected to its own device with data including point information, information with reference designation, and measurement values
Send to (23).

When the repeater 3-2 receives the data including the measured value from the arithmetic unit 4 (24 in FIG. 2), it checks whether or not the data includes reference-designated information (25). If the information with reference designation is not included, the process is terminated. If the information is included, the destination information corresponding to the measurement point information included in the data is sent to the own repeater 3
-2, the terminal control unit 5-3 for the destination indicated by the acquired destination information, that is, the measurement point c in the present example, and the repeater 3-1 for the measurement points a and b. The received data is transmitted to. As a result, the measurement value at the measurement point c is promptly distributed from the arithmetic unit 4 to the terminal control unit 5-3 via the transmission line 9-2, the repeater 3-2, and the transmission line 9-2.

In addition, the measurement points a and b are transmitted from the repeater 3-2 via the transmission line 8.
The repeater 3-1 which has received the data including the measured value also performs the operations of steps 24 to 26 in FIG. As a result, the data including the measurement value of the measurement point a is transmitted to the terminal control unit 5-1 and the data including the measurement value of the measurement point b is transmitted to the terminal control unit 5-2.

When each of the terminal control units 5-1 to 5-3 receives the distributed data (27 in FIG. 2), the measured value in the data is stored in the internal memory corresponding to the measurement point (28), After that, it is used as various control data to control the terminals 7-1 to 7-3.

In the above embodiment, the measurement value by the measurement sensor 6 was not transmitted to the main control unit 1 at all, but it is transmitted to the main control unit 1 for the reason of displaying the measurement value on the terminal device 2 to confirm the operation. To do so, it is sufficient to indicate to that effect to the repeaters 3-1 and 3-2 and the arithmetic unit 4. In this case, the arithmetic unit 4
If it is found from the contents of the reference specification table that the acquired measurement value is the measurement value related to the measurement point without reference specification, the measurement point information, the information without reference specification, and the measurement value are included without ending the processing. The data is transmitted to the repeater 3-2. Further, when each of the repeaters 3-1, 3-2, particularly the repeater 3-2 to which the arithmetic unit 4 is connected, receives the data including the measurement value, the data includes the information with reference designation. When it is in the same state, the same operation as described above is performed, and the data is relayed to the main control unit 1 via the transmission line 8. When the data without reference designation is included, the data is transmitted to the main control unit. Only the operation of relaying to 1. By performing such an operation in the arithmetic unit 4 and the repeater 3-2, the measurement sensor 6
It is possible to transmit the measured value of 1 to the main control unit 1 and display it on the terminal device 2.

In the above, the centralized monitoring device having only one measurement sensor is taken as an example, but in reality, a plurality of measurement sensors are installed, and an arithmetic device such as the arithmetic device 4 is provided for each measurement sensor.

〔The invention's effect〕

According to the data transmission system in the centralized monitoring device of the present invention described above, the following effects can be obtained.

(1) When a failure occurs in a repeater to which the arithmetic unit is not connected, the measurement data is not distributed only to the terminal control unit under the repeater. Further, the measurement data that is not distributed when a failure occurs in the arithmetic device or the repeater connected to the arithmetic device is limited to the measurement value of the measurement sensor connected to the arithmetic device. Further, since the main control unit does not intervene in the measurement value distribution path, the measurement values can be distributed even if the main control unit is stopped due to a failure or the like. As a result,
The impact of failure at a specific location is locally limited. Further, as a reflexive effect, it is easy to add or change a part of the configuration.

(2) The measurement data is distributed without going through the main control unit, and, for example, when the measurement value is distributed to the terminal control unit under the relay device to which the arithmetic unit is connected, the measurement data is distributed within the relay device. Since the transmission path to the main control unit is not used due to the loop, the transmission delay time at the time of distribution of the measured values is shortened, and the total traffic volume on the transmission path is suppressed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a centralized monitoring device to which the present invention is applied, FIG. 2 is a flow chart showing an operation example of an arithmetic unit, a repeater, and a terminal control unit, and FIG. 3 is a configuration diagram of a conventional example. is there. In the figure, 1 ... Main control unit 2 ... Terminal equipment 3-1 and 3-2 ... Repeater 4 ... Computing device 5-1 to 5-3 ... Terminal control unit 6 ... Measurement sensor 7-1 ~ 7-3 …… Terminals 8,9-1,9-2 …… Transmission path

Claims (3)

(57) [Claims] 1. A main control unit, a plurality of repeaters connected to the main control unit via transmission lines, a plurality of terminal control units connected to the respective relay units via transmission lines, and to each terminal control unit. It includes a connected terminal device and a measurement sensor, and distributes the measurement value measured by the measurement sensor to the terminal control unit that refers to it, and each terminal control unit performs its own operation based on the distributed measurement value. In a data transmission method in a centralized monitoring device that controls terminals connected to a terminal control unit, the presence or absence of reference designation for each measurement point by the measurement sensor is held between the measurement sensor and the nearest repeater. It has a reference designating table, and obtains the measurement value of each measurement point by the measurement sensor, and it is found from the content of the reference designating table that the obtained measurement value is a measurement value related to a measurement point with reference designation. By doing the measurement point information and Provided with an arithmetic unit for transmitting data including information with reference designation and measurement values to the nearest repeater, and providing a transmission control table showing correspondence between measurement point information and destination information in each of the repeaters, Each of the repeaters, when receiving the data including the measurement value,
If the data includes information with reference designation, the destination information corresponding to the measurement point information included in the data is acquired from the transmission control table, and the destination indicated by the acquired destination information is acquired. A data transmission method in a centralized monitoring device, characterized in that the received data is transmitted to a device. 2. The data transmission system in a centralized monitoring apparatus according to claim 1, wherein the arithmetic unit acquires the measured values of each measurement point by the measurement sensor at a constant cycle. 3. A data transmission system in a centralized monitoring device according to claim 2, wherein a plurality of measurement sensors are provided, and the arithmetic unit is provided for each measurement sensor.