JP2023065118A - Telemeter, monitoring control system, and monitoring control method - Google Patents

Abstract

To provide a monitoring control system having high reliability and not causing missing of data due to communication abnormality.SOLUTION: Between a master station and a slave station in a telemeter is connected via a communication line. Data aggregated in the master station is transmitted via a PLC, and the data is recorded by a monitoring control device. The monitoring control device implements the monitoring control on the basis of the recorded data. The master station has a function to determine whether or not a communication abnormality has occurred and whether or not the communication abnormality has been resolved. When it is determined that the communication abnormality has been resolved, the master station performs transmission request of the data during the communication abnormality period to the slave station, and acquires the data during communication abnormality period from the slave station. Then, the master station transmits the acquired data during the communication abnormality period to the monitoring control device. The monitoring control device records the data during the communication abnormality period so as to eliminate missing of the data during the communication abnormality period.SELECTED DRAWING: Figure 1

Description

The present invention relates to a telemeter, a supervisory control system and a supervisory control method.

Conventionally, the data of the monitored object is captured by a communication terminal installed on site, and the data (status data of the monitored object) is transferred to and displayed on a monitoring control device installed in a remote location via communication. 2. Description of the Related Art There is known a monitoring control system that sends commands to on-site equipment and remotely controls them. For example, monitoring and control systems are used in water supply and sewerage systems, water distribution facilities, water level monitoring of rivers, industrial production facilities, and the like. Such a technique is disclosed, for example, in Japanese Patent Laying-Open No. 2016-1414 (Patent Document 1). A remote data collection device for automatically collecting data detected by field-mounted sensors and transmitting the data to a supervisory control device is also commonly known as a "telemeter."

Such supervisory control systems and telemeters use analog dedicated lines and broadband lines as communication lines.

As a water supply system for waterworks, for example, a system is known in which tap water is stored in a tank installed on a hill and distributed to a demand area by gravity flow. Water purification plants that produce tap water are often located on flat land where it is easy to construct treatment facilities, so tanks and water purification plants are often located in remote locations.

Therefore, it is necessary to send water from the water treatment plant to the tank using a pump. In such pump control, the tank water level data transmitted from the telemeter is taken into the monitoring control device, the monitoring control device monitors changes in the state of the water level data, and stops the pump when the tank water level exceeds a specified value. A command is issued to a pump control device at a remote pumping station to stop the pump, and when it falls below a specified value, the pump is started.

In recent years, many telemeters have a form in which a PLC (Programmable Logic Controller) is added with a transmission module corresponding to connection to a communication line. In many cases, an input/output using a contact signal is used as an interface (IF) of the telemeter, and sequence processing is often performed before outputting the signal from the telemeter to the control circuit of the pump. Therefore, using a PLC, which is good at these processes, as a base is advantageous in terms of product development and actual operation.

JP 2016-1414 A

Normally, a supervisory control system includes a telemeter that includes a slave station that collects and records data, a master station that receives data transmitted from the slave station via a communication line, and a telemeter master station. Receives transmitted data, records the data, displays the data and information processed from that data, and transmits operation signals (control signals) to operation devices installed on-site depending on the situation. and a monitoring control device.

In such a supervisory control system, if some kind of communication error occurs between the child station and the parent station, the parent station cannot receive data from the child station during the communication error period. As a result, the supervisory control device stops transmitting data from the master station and becomes unable to obtain data during the communication abnormality period. In other words, loss occurs in the data recorded in the supervisory control device. A communication abnormality occurs due to, for example, disconnection, short circuit, poor contact, lightning surge, etc. in a communication line, and also when some abnormality occurs in communication equipment on the slave station side. If such data loss occurs in the supervisory control system, the supervisory control device will not be able to fully grasp the local conditions, making appropriate supervisory control difficult.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable transmission of data during a communication abnormality period from a slave station to a master station when communication is restored when a communication error occurs between a telemeter slave station and a master station, thereby preventing data loss. To provide a telemeter, a supervisory control system and a supervisory control method capable of eliminating the

In order to solve the above problems, the present invention provides, as an example, a telemeter having a slave station that records collected data and a master station that receives and records the data recorded by the slave station. the slave station transmits the data to the master station, the master station records the received data, and if the data is not received from the slave station within a predetermined time, it is determined that a communication error has occurred. After that, it is determined that the communication abnormality has been resolved because the child station has started transmitting the data, and if it is determined that the communication abnormality has been resolved, the child station is notified of the communication abnormality from the time when the communication abnormality occurred to the time when the communication abnormality was resolved. The telemeter requests transmission of the data during the abnormal communication period, receives the data during the abnormal communication period from the child station, and records the data during the abnormal communication period.

Further, as another example of the present invention, a telemeter having a slave station for recording collected data and a master station for receiving and recording the data recorded by the slave station via a communication line; and a supervisory control device that receives and records the data recorded by a master station and performs supervisory control based on the recorded data, wherein the slave station transmits the data to the master station. The master station records the received data, transmits the data to the supervisory control device, and determines that a communication abnormality has occurred if the data is not transmitted from the slave station within a predetermined time. When it is determined that the communication abnormality has been resolved due to the start of receiving the data from the slave station, and if it is determined that the communication abnormality has been resolved, during the communication abnormality period from the time when the communication abnormality occurs to the time when the communication abnormality is resolved with respect to the slave station , receives the data during the abnormal communication period from the child station, records the data during the abnormal communication period, and transmits the data to the supervisory control device, wherein the supervisory control device is A supervisory control system for recording said data transmitted during said communication failure period.

According to still another example of the present invention, a telemeter comprising a slave station that records measured data and a master station that receives and records the data recorded by the slave station is provided, and the telemeter recorded by the master station is provided. A supervisory control method for receiving and recording data and performing supervisory control based on the recorded data, wherein the slave station transmits the data to the master station, and the master station receives the data within a predetermined time. If the data is not transmitted from the slave station at this time, it is determined that a communication abnormality has occurred, and thereafter, when the data reception from the slave station is started, it is determined that the communication abnormality has been resolved, and the master station determines that the communication abnormality has been resolved. If it is determined that, the slave station is requested to transmit the data during the communication abnormality period from the time when the communication abnormality occurs to the time when the communication abnormality is resolved, and the slave station transmits the data during the communication abnormality period. and recording the data during the communication abnormality period.

According to the present invention, even if a communication abnormality occurs, when the communication abnormality is resolved, the data during the period of the communication abnormality can be transmitted from the slave station to the master station. A supervisory control system and a supervisory control method can be provided.

1 is a configuration diagram of a monitoring control system in an embodiment of the present invention; FIG. FIG. 4 is a diagram for explaining processing operations when communication is normal; FIG. 10 is a diagram for explaining processing operations when a communication error occurs; FIG. 4 is a diagram for explaining processing operations when communication is restored;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a supervisory control system in an embodiment of the present invention. 2 to 4 are diagrams for explaining the processing operation of the embodiment shown in FIG.

Here, the present invention should not be construed as being limited to the contents of the examples described below. Those skilled in the art will easily understand that the configuration can be changed without departing from the technical idea or gist of the present invention.

In addition, in the configurations of the embodiments described below, the same reference numerals may be used in common for the same devices or parts having similar functions in different drawings, and redundant description may be omitted.

In addition, notations such as "first" and "second" in this specification are attached to identify the constituent elements, and do not necessarily limit the number, order, or content thereof. Also, numbers for identifying components are used for each context, and numbers used in one context may not necessarily indicate the same configuration in another context. Also, it does not preclude a component identified by a certain number from having the function of a component identified by another number.

Also, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. Accordingly, the present invention is not limited to the location, size, shape, extent, etc. of components disclosed in the drawings.

Also, elements presented herein in the singular shall include the plural unless the context clearly dictates otherwise.

One embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. The supervisory control system in FIG. 1 includes child stations 101, 102, and 10N and a master station 200 that constitute a telemeter. A communication line 300 such as a broadband line is used for data transmission/reception between the slave station and the master station. Any communication line 300 can be used as long as mutual communication is possible. For example, a wired line such as an optical line or a wireless line can be used. Also, the communication line 300 may be a dedicated line or a public line. In addition to the telemeter, the supervisory control system includes a supervisory control device 500 that receives data transmitted from the telemeter master station 200, records (stores) the data, and performs supervisory control based on the recorded data. include.

Here, monitoring control means recording (storing) the data received from the telemeter in the storage unit, performing data processing such as processing, editing, and saving the recorded data or the data, and displaying information necessary for monitoring. These include displaying on a device for monitoring, and based on this information, computing a control signal (operation signal) for controlling operation of a remote control device.

In this embodiment, a PLC 400 having a relay function is provided between the telemeter master station 200 and the supervisory control device 500 to receive data transmitted from the master station 200 and transmit the data to the supervisory control device 500. configured to send to However, in the present invention, the connection between the master station 200 and the supervisory control device 500 may be directly connected without going through the PLC 400 . In particular, when the distance between the supervisory control device 500 and the master station 200 is short, the configuration can be simplified by connecting them so as to be directly communicable (data can be sent and received) via a LAN (Local Area Network) or the like.

Also, although this embodiment is configured to have a plurality of telemeter slave stations, it is also possible to implement the system with only one. In FIG. 1, it is assumed that each slave station has the same configuration, and only the slave station 101 is representatively described in detail. The description of the configuration is omitted. In principle, data D from a sensor (not shown) input to each slave station is different for each slave station. It should be noted that although it is not necessary for each child station to have the same configuration, the construction of the system can be facilitated by making each child station have the same configuration. It is also preferable in terms of facilitating system maintenance/inspection work and repair.

Furthermore, in this embodiment (FIG. 1), the parent station 200 has substantially the same hardware configuration as the child station, although the functions are different from those of the child station. Therefore, the description of the configuration of the slave station may be omitted as the description of the corresponding configuration of the master station.

Next, the configuration and operation of the child station will be described. First, the configurations and functions (operations) of each slave station in this embodiment are the same. Therefore, only the configuration and operation of the slave station 101 will be described here, and the description of the other slave stations (102, 10N) will be omitted. Each slave station in this embodiment is configured to sequentially transmit data to the master station in accordance with a predetermined order.

The child station 101 has the function of a computer (computer) in which an arithmetic processing unit 121 such as a CPU executes a series of processing operations according to an operation program stored in an internal storage unit 122 . It should be noted that, in this embodiment, a PLC is adopted as the slave station 101 . A CPU module 110 , a transmission module 120 and an IF module 130 are attached to the slave station 101 . The CPU module 110 has a storage unit and an arithmetic processing unit (not shown), and has the function of a computer that executes software (stored programs) by itself. For example, the CPU module 110 executes telemetry software S1 created according to transmission contents such as a ladder program.

Also, the transmission module 120 itself has a computer function capable of executing software (a stored program). Therefore, the transmission module 120 communicates (data transmission ), and a port 124 based on standards such as Ethernet for connecting to the communication line 300 . The transmission module 120 records (stores) input data, automatically transmits the data to the master station 200 via the communication line 300, and records according to a data transmission request from the master station 200. Arithmetic processing such as transmitting the data stored in the master station 200 to the master station 200 is executed. This arithmetic processing is executed by the arithmetic processing circuit 121 according to a program recorded in the storage unit 122 .

The CPU module 110 performs signal input/output to the IF module 130 and data transmission/reception to/from the transmission module 120 by processing the telemeter software S1.

The transmission module 120 converts data received from the CPU module 110 into communication telegrams and converts communication telegrams received from the communication line 300 into PLC data by software (program) executed by the arithmetic processing unit 121. .

Also, the transmission module 120 in this embodiment generates a first management number, associates the first management number with the data, and stores them in the storage unit 122 . In the following description, information including data and this management number may be referred to as "data information". When transmitting data to the master station, the transmission module 120 transmits the first management number (data information) to the master station 200 together with the data. In this case, as will be described later, the first management number is a value of a healthy counter (hereinafter referred to as a first healthy count value C1) that can be used when diagnosing the communication state (performing a healthy check) on the master station side. ) is used.

Next, the configuration and operation of master station 200 will be described. A master station 200 is composed of a CPU module 210 , a transmission module 220 and an IF module 230 . The transmission module 220 is itself a computer capable of executing software (stored programs). The transmission module 220 has an arithmetic processing unit 221 such as a microcomputer that executes software, a storage unit 222 such as a ROM that stores programs and a flash memory that stores input data, and an IF 223 for communicating with the CPU module 210. .

The hardware configuration of this transmission module 220 is similar to that of the transmission module 120 of the slave station 101 . Transmission module 220 receives data and first healthy count value C1 transmitted from child station 101 via port 124, and calculates a second healthy count, which is the control number of the parent station, based on first healthy count value C1. A value C2 is generated, and the data received together with this second healthy count value C2 is recorded (stored) in the storage unit 222 . Further, the transmission module 220 converts the data D and the second healthy count value C2 to the CPU module 210 and transmits them to the CPU module 210 via the IF 223 . Such arithmetic processing in the transmission module 220 is executed by a program stored in the storage unit 222 by the arithmetic processing unit 221 .

In this embodiment, CPU module 210 transmits received data D and second healthy count value C2 (data information) to PLC 400 via IF module 230 .

PLC 400 is connected to IF module 230 of master station 200 , and this PLC 400 is also connected to supervisory control device 500 . That is, data information (data D and second healthy count value C2) transmitted from master station 200 is once input to PLC 400 and transmitted to supervisory control device 500 via PLC 400 .

Monitoring control device 500 receives data information transmitted from master station 200 via PLC 400 , that is, data D and second healthy count value C 2 , and stores them in storage unit 530 via IF 510 .

Here, the monitoring control device 500 has a function as a computer. Therefore, when a computer is installed in the upper level of the system, the computer in the upper level may be used instead of providing the supervisory control device 500 independently as shown in FIG. In that case, the configuration of the entire system can be simplified, and there is also an advantage in terms of cost.

In addition, the monitoring control device 500 can be realized by using an external server such as a cloud service for some or all of the monitoring control functions. That is, for example, data information for monitoring transmitted from the telemeter master station 200 is stored in an external server, and data stored in the external server is stored in the terminal device (personal computer, smartphone, etc.) on the monitoring side. Information may be obtained via the Internet or the like, and monitoring control may be performed by the terminal device based on the data information. In addition, the server may be configured not only to record data but also to perform monitoring and control functions, and the terminal device may be configured to obtain the results of the monitoring and control. By using such a cloud service, it is possible to reduce the capital investment cost of the entire supervisory control system.

Next, with reference to FIG. 2, the contents of operation processing when communication abnormality does not occur (normal time) will be described. 1 and 2 have the same system configuration.

The CPU module 110 of the slave station 101 receives data D collected by a sensor or the like (not shown) and transmits the data to the transmission module 120 . The transmission module 120 creates (generates) a healthy counter value (first healthy count value C1) for the data D received from the CPU module 110, and transmits the data D and this first healthy count value C1 (data information). is transmitted from the port 124 to the master station 200 via the communication line 300 .

The master station 200 (specifically, the transmission module 220 ) receives the data information (the data D and the first healthy count value C<b>1 ) transmitted from the slave station 101 to the transmission module 220 via the port 224 . Upon receiving the data information from the child station 101, the transmission module 220 generates a second healthy count value C2, which is the control number in the parent station, based on the first healthy count value C1. The transmission module 220 records (stores) data information in which the data D and the second healthy count value C2 are set in the storage unit 222 . Also, the first healthy count value C1 is recorded.

Subsequently, the arithmetic processing unit 221 of the transmission module 220 of the master station 200 converts the data information (the data D and the second healthy count value C2) recorded in the storage unit 222 to be transferred to the CPU module 210 . Then, this data information is transmitted to the CPU module 210 via the IF 223 .

Also, the transmission module 220 (arithmetic processing unit 221) determines that the communication state is normal on the condition that data information is received within a predetermined time. In this embodiment, it is confirmed that the received first healthy count value C1 has been updated within a predetermined period of time, and that no communication error has occurred (that the communication is normal). If the first healthy count value C1 is not updated within a predetermined period of time, it is determined that there is a communication abnormality.

CPU module 210 transmits data information (received data D and second healthy count value C2) to PLC 400 via IF module 230 .

PLC 400 transmits this received data information to IF 510 of supervisory control device 500 .

Monitoring control device 500 (arithmetic processing unit 520 ) records (stores) data information (data D and second healthy count value C<b>2 ) acquired via IF 510 in storage unit 530 .

In addition, the monitoring control device 500 (arithmetic processing unit 520) determines (confirms) whether or not the second healthy count value C2 in the received data information has been updated within a predetermined period of time, and whether or not the update is continuously performed. Confirm that communication is performed normally by As a result, the monitor control device 500 can also monitor whether the communication state is normal.

In this way, when communication is normally performed, data information (data D and healthy count value C2) transmitted from slave station 101 to master station 200 is sent to supervisory control device 500 via PLC 400. Recorded. The monitor control device 500 executes monitor control based on this recorded data information (data D and second healthy count value C2).

Next, with reference to FIG. 3, operation processing when communication between the slave station and the master station is abnormal (for example, when the communication line 300 is disconnected) will be described.

Whether or not a communication abnormality has occurred can be determined by determining whether data information continuously received and recorded in the master station 200 (transmission module 220) cannot be received within a predetermined period of time. In this embodiment, it is determined whether or not the first healthy count value C1 has been updated within a predetermined period of time. That is, when the first healthy count value C1 is not updated within a predetermined time, it is determined that communication is abnormal. The first healthy count value C1 and the second healthy count value C2 at the time when it is determined that the communication abnormality has occurred (when the communication abnormality occurs) are stored in the storage unit 222 as information indicating the time when the communication abnormality occurs.

On the other hand, the slave station 101 (more specifically, the transmission module 120) continues the operation of storing the data information including the data D and the first healthy count value D1 in the storage unit 122 regardless of whether the communication is abnormal. do. Furthermore, the operation of transmitting the data information recorded in the storage unit 122 to the master station 200 is continued. In other words, the same operation as when communication is normal continues. By recording data regardless of the presence or absence of such a communication abnormality, it becomes possible to transmit the data during the communication abnormality period to the master station when the communication state is restored later.

By confirming that the first healthy counter C1 received from the child station 101 is not updated, the master station 200 (specifically, the transmission module 220) judges that the communication is abnormal, and determines that point as the start of the communication abnormality. The values of the healthy counter C1 and the healthy counter C2 are recorded in the storage unit 222. Also, the data at that time and the second healthy count value C2 are transferred to the CPU module 210 .

CPU module 210 transmits the current data information (data D and second healthy count value C2) to PLC 400 via IF module 230 . That is, the data information (data D and second healthy count value C2) at the time of communication failure is transmitted.

PLC 400 transmits this data information to supervisory control device 500 .

The monitoring control device 500 records the data information (the data D and the second healthy count value C2) acquired via the IF 510 in the storage unit 530 . Then, the state of the recorded second healthy count value C2 is checked, and if the second healthy count value C2 is not updated within a predetermined time, it can be determined that communication is abnormal. That is, since the data information transmitted from the master station 200 is interrupted when the communication abnormality occurs, the occurrence of the communication abnormality can be determined by monitoring the state of the second healthy count value C2 included in the data information. If the second healthy count value C2 is not updated within a predetermined period of time, the monitoring control device 500 records the second healthy count value C2 at that time in the storage unit 530 as information on the occurrence of communication abnormality.

In this way, when a communication abnormality occurs, the master station 200 and the supervisory control device 500 can determine that "communication abnormality has occurred".

Next, with reference to FIG. 4, a processing operation in a state in which the communication abnormality state is resolved (when the communication abnormality is resolved) will be described.

Here, as described above, the transmission module 120 of the slave station 101 maintains data information (data The recording operation of D and the first healthy count value C1) in the storage unit and the data transmission operation of transmitting the data information to the master station 200 are continued.

Since the master station 200 (transmission module 220) can receive the data D and the first healthy count value again from the slave station 101 when the communication abnormality is resolved, the data information (the data and the first healthy count value C1) is received. It is possible to confirm that the communication abnormality has been resolved, that is, to determine that the communication has been restored. The transmission module 220 records the first healthy count value C1 received from the child station 101 at the start of re-reception in the storage unit 222 as information indicating when the communication abnormality is resolved.

When the master station 200 (transmission module 220) determines that the communication abnormality has been resolved by starting to receive data information from the slave station 101 again, the master station 200 (transmission module 120) sends the data from the time when the communication abnormality is started to the time when the communication abnormality is resolved to the slave station 101 (transmission module 120). A transmission request R for the data information (data D and the first healthy count value C1) during the abnormal communication period is issued. The transmission request R includes the first healthy count value C1 when the communication abnormality occurs and the first healthy count value C1 when the communication abnormality is resolved.

The slave station 101 (transmission module 120), based on the first healthy count value C1 at the occurrence of the communication abnormality included in the transmission request R and the first healthy count value C1 at the time when the communication abnormality is resolved, It is possible to grasp the range of data information (data information recorded during a period of abnormal communication). The slave station 101 extracts data information during the communication abnormality period from the data recorded in the storage unit 122 and transmits the extracted data information to the master station 200 .

When the transmission module 220 of the master station 200 receives the data information (data D and the first healthy count value C1) during the communication abnormality period from the slave station 101, the second healthy count value C2 corresponding to the first healthy count value C1 , and records the data information (data D and this second healthy count value C2) during the communication abnormality period in the storage unit 222 . The transmission module 220 also transmits data information during the communication abnormality period to the CPU module 210 .

The transmission module 220 also passes the latest data information (data D and the second healthy count value D2) recorded based on the latest data information transmitted from the child station to the CPU module 210 . After that, the operation during normal communication is executed. That is, the transmission module 220 transfers the latest data information to the CPU module 210 based on the data information from the child stations that are received one after another. It should be noted that the transmission module 220 performs necessary information conversion when transferring data information to the CPU module 210 .

Master station 200 (CPU module 210) transmits the latest data information to PLC 400 via IF module 230 together with the data information (data D and second healthy count value C2) during the communication abnormality period.

PLC 400 transmits the data information received from master station 200 during the communication abnormality period and the latest data information to supervisory control device 500 .

The supervisory control device 500 records these pieces of data information (data information during the communication abnormality period and latest data information) acquired via the IF 510 in the storage unit 530 . That is, the data information during the communication abnormality period (the data during the communication abnormality period and the second healthy count value) is recorded following the information recorded when the communication abnormality occurred in the storage unit 530, and the latest information is recorded during the communication abnormality period. record after the information in After that, the data information successively transmitted from the parent station side is sequentially recorded in the storage unit 530 as described in the case of normal operation.

As a result, the telemeter master station 200 and the supervisory control device 500 can record the data information (the data D and the healthy count value C2) during the communication abnormality period in the internal storage unit. Therefore, even if a communication abnormality occurs, when the communication abnormality is resolved, the data information during the communication abnormality period can be obtained and recorded, so that monitoring control can be performed without data loss.

As described above, according to the embodiment of the present invention, even if some kind of communication abnormality occurs between the telemeter master station and the slave station, data information during the communication abnormality period is transmitted from the slave station when the communication abnormality is resolved. Since it becomes possible to transmit to the master station, it is possible to realize highly reliable supervisory control that does not cause data loss.

In addition, in the embodiment of the present invention, data information is recorded by generating a management number together with data, thereby facilitating data management. Furthermore, by adopting a healthy count value that enables execution of a healthy check as this management number, it is possible to easily determine whether there is a communication abnormality in the master station 200 . Also, by transmitting this management data to the supervisory control device 500, the supervisory control device can also manage communication errors.

DESCRIPTION OF SYMBOLS 101, 102, 10N... Slave station, 110... CPU module, 120... Transmission module, 121... Operation processing part, 122... Storage part, 123... IF, 124... Port, 130... IF module, 200... Master station, 210 CPU module , 220...Transmission module, 221...Arithmetic processing unit, 222...Storage unit, 223...IF, 224...Port, 230...IF module, 300...Communication line, 400...PLC, 500...Monitoring control device, 510...IF, 520 ... arithmetic processing unit, 530 ... storage unit

Claims (15)

A telemeter comprising a slave station that records collected data and a master station that receives and records the data recorded by the slave station,
the slave station transmits the data to the master station;
The master station records the received data, determines that a communication error has occurred when the data is not received from the slave station within a predetermined time, and thereafter starts transmitting the data from the slave station. When it is determined that the communication abnormality has been resolved, the slave station is requested to transmit the data during the communication abnormality period from the time when the communication abnormality occurs until the time when the communication abnormality is resolved. a telemeter that receives the data during the communication failure period from and records the data during the communication failure period. A telemeter as claimed in claim 1, wherein
A telemeter, wherein the master station transmits the data to a supervisory control device that performs supervisory control. A telemeter according to claim 1, comprising:
the slave station generates a first management number for data management and transmits the data together with the first management number to the master station;
A telemeter, wherein the master station generates a second management number, which is a master station side management number, based on the first management number, and records the data from the slave station together with the second management number. A telemeter according to claim 3,
The first management number is a first healthy count value for performing a healthy check, and the master station determines that the communication abnormality has occurred when the first healthy count value is not updated within the predetermined time. and telemeter. A telemeter having a slave station that records collected data, a master station that receives and records the data recorded by the slave station via a communication line, and a telemeter that receives and records the data recorded by the master station. and a supervisory control device that performs supervisory control based on the recorded data,
the slave station transmits the data to the master station;
The master station records the received data, transmits the data to the supervisory control device, determines that a communication error has occurred when the data is not transmitted from the slave station within a predetermined period of time, and then When it is determined that the communication abnormality has been resolved by starting to receive the data from the station, and if it is determined that the communication abnormality has been resolved, the child station is notified of the communication abnormality during the communication abnormality period from the time when the communication abnormality occurs to the time when the communication abnormality is resolved. making a transmission request for the data, receiving the data during the communication abnormality period from the slave station, recording the data during the communication abnormality period, and transmitting the data to the supervisory control device;
The supervisory control system, wherein the supervisory control device records the transmitted data during the communication abnormality period. In the supervisory control system according to claim 5,
The slave station generates a first management number for data management and transmits the data together with the first management number to the master station. A supervisory control system characterized by generating a second management number, which is a management number, and recording said data from said slave station together with said second management number. In the supervisory control system according to claim 6,
The first management number is a first healthy count value for performing a healthy check, and the master station determines that the communication abnormality has occurred when the first healthy count value is not updated for a predetermined time. control system. In the supervisory control system according to claim 7,
The master station uses a second healthy count value as the second management number, transmits the second healthy count value together with the data to the supervisory control device, and the supervisory control device receives the transmitted second healthy count value. A supervisory control system, wherein the occurrence of the communication abnormality is confirmed by a count value. In the supervisory control system according to claim 5,
A supervisory control system comprising a PLC having a relay function for receiving the data transmitted by the master station and transmitting the data to the supervisory control device. In the supervisory control system according to claim 5,
A supervisory control system, wherein at least part of the functions of the supervisory control device are provided in an external server. 6. The supervisory control system according to claim 5, wherein said supervisory control device is a host computer. A telemeter comprising a slave station for recording measured data and a master station for receiving and recording the data recorded by the slave station, receiving and recording the data recorded by the master station, and recording the data. A supervisory control method for supervisory control based on the data obtained,
The slave station transmits the data to the master station, and the master station judges that a communication error occurs when the data is not transmitted from the slave station within a predetermined time, and then receives the data from the slave station. When the master station determines that the communication abnormality has been resolved, the master station informs the slave station of the communication abnormality period from the time when the communication abnormality occurs to the time when the communication abnormality is resolved. and receiving the data during the abnormal communication period from the child station and recording the data during the abnormal communication period. In the monitoring control method according to claim 12,
The slave station generates a first management number for data management, transmits the data together with the first management number to the master station, and the master station sends data to the master station based on the first management number. A supervisory control method characterized by generating a second management number, which is a management number, and recording the data from the child station together with the second management number. In the monitoring control method according to claim 13,
The first management number is a first healthy count value for performing a healthy check, and the master station determines that the communication abnormality has occurred when the first healthy count value is not updated for a predetermined time. control method. In the monitoring control method according to claim 14,
A supervisory control method, wherein the master station uses a second healthy count value as the second management number and records the second healthy count value together with the data.

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