Telemeter, monitoring and control system, and monitoring and control method

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

Technical Field

[0001] The present invention relates to a telemeter, a monitoring and control system, and a monitoring and control method.

Background Art

[0002] Conventionally, there has been known a monitoring and control system that captures data of a monitoring target into a communication terminal installed at a site and transfers and displays the data (status data of the monitoring target) to a monitoring and control device installed at a remote location via communication, and sends a command to equipment at the site according to the situation to perform remote operation. For example, the monitoring and control system is used in water supply and distribution facilities for water supply and sewerage, water level monitoring of rivers, and industrial production facilities. Such technology is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2016-1414 (Patent Document 1). Further, a remote data collection device that automatically collects data detected by a sensor installed on-site and transmits the data to a monitoring and control device is well known as a "telemeter".

[0003] In such a monitoring and control system and telemeter, an analog dedicated line or a broadband line is used as a communication line.

[0004] In the water distribution system of a water supply, for example, there is known a method of storing tap water in a tank installed on a high place and distributing the water to a demand area by natural flow due to gravity. Since a water purification plant that produces tap water is often provided on flat land where construction of treatment facilities is easy, the tank and the water purification plant are often in remote locations.

[0005] Therefore, it is necessary to pump water from the water purification plant to the tank using a pump. Control of such a pump involves capturing the water level data of the tank transmitted from the telemeter into the monitoring and control device, the monitoring and control device monitoring the change in the state of the water level data, and when the water level of the tank exceeds a specified value, instructing the pump control device at the pump station at a remote location to stop the pump, and when it falls below the specified value, performing control such as operating the pump.

[0006] In recent years, many telemeters are of a form in which a transmission module corresponding to the connection to a communication line is added to a PLC (Programable Logic Controller). In many cases, the interface (IF) of the telemeter uses input / output by contact signals, and sequence processing is often performed before outputting a signal from the telemeter to the control circuit of the pump and then outputting. Therefore, basing on a PLC that is good at these processes has advantages in product development and actual operation.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Generally, a monitoring and control system includes a telemeter composed of a slave station that collects and records data and a master station that receives data transmitted from the slave station via a communication line, and a monitoring and control device that receives data transmitted from the master station of the telemeter, records the data, displays the data and information processed from the data, and transmits an operation signal (control signal) to operating equipment installed on-site according to the situation.

[0009] In such a monitoring and control system, when any communication abnormality occurs between the slave station and the master station, during the communication abnormality period, the master station cannot receive data from the slave station. As a result, the monitoring and control device stops receiving data from the master station and cannot obtain data during the communication abnormality period. That is, a deficiency occurs in the recorded data of the monitoring and control device. Communication abnormalities can occur, for example, due to disconnection, short circuit, poor contact, or lightning surge in the communication line, or when any abnormality occurs in the communication equipment on the slave station side. In the monitoring and control system, when such data deficiency occurs, the monitoring and control device cannot fully grasp the local state, making it difficult to perform appropriate monitoring and control.

[0010] Therefore, an object of the present invention is to provide a telemeter, a monitoring and control system, and a monitoring and control method capable of eliminating data deficiency by enabling the slave station of the telemeter to transmit data during the communication abnormality period to the master station when the communication abnormality occurs between the slave station and the master station.

Means for Solving the Problems

[0011] To solve the above problems, in one example of the present invention, there is provided a telemeter including a slave station that records collected data and a master station that receives and records the data recorded by the slave station, wherein the slave station transmits the data to the master station, and the master station records the received data and determines that a communication abnormality has occurred when the data from the slave station is not received within a predetermined time. Then, when it is determined that the communication abnormality has been resolved because the transmission of the data from the slave station has started, a transmission request for the data during the communication abnormality period from the occurrence of the communication abnormality to the resolution of the communication abnormality is sent to the slave station, the data during the communication abnormality period is received from the slave station, and the data during the communication abnormality period is recorded.

[0012] Further, as another example of the present invention, there is provided 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 via a communication line, and a monitoring and control device that receives and records the data recorded by the master station and performs monitoring and control based on the recorded data. The slave station transmits the data to the master station, and the master station records the received data and transmits the data to the monitoring and control device. When the data is not transmitted from the slave station within a predetermined time, it is determined that a communication abnormality has occurred. Then, when the reception of the data from the slave station is started, it is determined that the communication abnormality has been resolved. When it is determined that the communication abnormality has been resolved, a transmission request for the data during the communication abnormality period from the time when the communication abnormality occurred to the time when the communication abnormality was resolved is made to the slave station, the data during the communication abnormality period is received from the slave station, the data during the communication abnormality period is recorded, and the data is transmitted to the monitoring and control device. The monitoring and control device records the transmitted data during the communication abnormality period. This is a monitoring and control system.

[0013] Still further, as another example of the present invention, there is provided a telemeter including a slave station that records measured data and a master station that receives and records the data recorded by the slave station, and a monitoring and control method that receives and records the data recorded by the master station and performs monitoring and control based on the recorded data. The slave station transmits the data to the master station, and the master station determines that a communication abnormality has occurred when the data is not transmitted from the slave station within a predetermined time. Then, when the reception of the data from the slave station is started, it is determined that the communication abnormality has been resolved. When the master station determines that the communication abnormality has been resolved, the master station makes a transmission request for the data during the communication abnormality period from the time when the communication abnormality occurred to the time when the communication abnormality was resolved to the slave station, and receives the data during the communication abnormality period from the slave station and records the data during the communication abnormality period. This is a monitoring and control method.

Advantages of the Invention

[0014] According to the present invention, even when a communication abnormality occurs, it is possible to transmit data during the communication abnormality period from the slave station to the master station when the communication abnormality is resolved. Therefore, it is possible to provide a telemeter, a monitoring and control system, and a monitoring and control method that solve the problem of data loss.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a monitoring and control system in an embodiment of the present invention. FIGS. 2 to 4 are diagrams for explaining the processing operations of the embodiment shown in FIG. 1.

[0017] Here, the present invention is not to be construed as being limited to the description of the embodiments described below. Those skilled in the art can easily understand that the configuration can be changed without departing from the technical idea or spirit of the present invention.

[0018] Also, in the configuration of the embodiments described below, the same reference numerals are commonly used among different drawings for the same device or parts having similar functions, and duplicate explanations may be omitted.

[0019] Also, notations such as "first" and "second" in this specification are for identifying components and do not necessarily limit the number, order, or content. Also, the numbers for identifying components are used for each sub-branch, and the numbers used in one context may not necessarily indicate the same configuration in other contexts. Also, it does not prevent a component identified by a certain number from having the functions of a component identified by another number.

[0020] Also, the positions, sizes, shapes, ranges, etc. of each configuration shown in the drawings may not represent the actual positions, sizes, shapes, ranges, etc. in order to facilitate the understanding of the invention. Therefore, the present invention is not limited to the positions, sizes, shapes, ranges, etc. of the configuration devices disclosed in the drawings.

[0021] Also, components represented in the singular form in this specification shall include the plural form unless otherwise clearly indicated in the context.

[0022] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. The monitoring control system in FIG. 1 includes slave stations 101, 102, 10N that constitute a telemeter, and a master station 200. A communication line 300 such as a broadband line is used for data transmission and reception between the slave stations and the master station. The communication line 300 may be any type as long as mutual communication is possible, and 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. Also, in addition to the telemeter, the monitoring control system includes a monitoring control device 500 that receives data transmitted from the master station 200 of the telemeter, records (stores) the data, and performs monitoring control based on the recorded data.

[0023] Here, the monitoring and control means recording (storing) the data received from the telemeter in the storage unit, performing data processing such as processing, editing, and storing the recorded data or the data, displaying the information necessary for monitoring on the display device for monitoring, and calculating a control signal (operation signal) for performing control to operate the operating device located at a remote location based on such information, and so on.

[0024] In this embodiment, a PLC 400 having a relay function is provided between the master station 200 of the telemeter and the monitoring and control device 500, configured to receive the data transmitted from the master station 200 and transmit the data to the monitoring and control device 500. However, in the present invention, the connection between the master station 200 and the monitoring and control device 500 may be directly connected without passing through the PLC 400. In particular, when the distance between the monitoring and control device 500 and the master station 200 is short, for example, by using a LAN (Local Area Network) or the like, the configuration can be simplified by directly connecting so that communication (data transmission and reception) is possible.

[0025] Also, in this embodiment, the slave stations of the telemeter are configured to have a plurality of units, but it can also be realized with one unit. In FIG. 1, the configurations of the respective slave stations are the same, and only the representative detailed configuration of the slave station 101 is described in detail, and for the sake of simplifying the explanation, the description of the detailed configurations of the other slave stations (102, 10N) is omitted. In addition, the data D from the sensors (not shown) input to each slave station is generally different for each slave station. Note that the configurations of the slave stations do not necessarily have to be the same for each slave station, but by making the configurations of the respective slave stations the same, the construction of the system becomes easy. Also, it is preferable in terms of facilitating the maintenance, inspection work, and repair of the system.

[0026] Furthermore, in this embodiment (FIG. 1), although the master station 200 is different from the slave stations in terms of function, the hardware configuration is substantially the same as the configuration of the slave stations. Therefore, the content described for the configuration of the slave stations may be omitted as the description of the corresponding configuration of the master station.

[0027] Next, the configuration and operation of the slave stations will be described. First, the configurations and functions (operations) of each slave station in this embodiment are the same. Therefore, here, only the configuration and operation of slave station 101 will be described, and the descriptions of other slave stations (102, 10N) will be omitted. Note that each slave station in this embodiment is configured to sequentially transmit data to the master station in a predetermined order.

[0028] Slave station 101 has the function of a computer (calculator) in which an arithmetic processing device 121 such as a CPU executes a series of processing operations according to an operation program stored in an internal storage unit 122. In this embodiment, a PLC is adopted for slave station 101. A CPU module 110, a transmission module 120, and an IF module 130 are attached to 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 program) by itself. For example, the CPU module 110 executes telemetry software S1 created according to the transmission content such as a ladder program.

[0029] Also, the transmission module 120 also has the function of a computer that can execute software (stored program) by itself. Therefore, the transmission module 120 includes an arithmetic processing unit 121 such as a microcomputer that executes software, a storage unit 122 such as a ROM that stores a program and a flash memory that stores input data, etc., an IF 123 for communicating (data transmission) with the CPU module 110, and a port 124 based on a standard such as Ethernet for connecting to the communication line 300. In the transmission module 120, the input data is recorded (stored), and data is automatically transmitted to the master station 200 via the communication line 300, and in accordance with a data transmission request from the master station 200, the recorded data is transmitted to the master station 200, etc. Such arithmetic processing is executed by the arithmetic processing circuit 121 according to the program recorded in the storage unit 122.

[0030] The CPU module 110 performs input / output of signals to the IF module 130 and transmission / reception of data to / from the transmission module 120 through the processing of the telemetry software S1.

[0031] The transmission module 120 converts the data received from the CPU module 110 into a communication telegram and the communication telegram received from the communication line 300 into PLC data by software (program) executed in the arithmetic processing unit 121.

[0032] Also, the transmission module 120 in this embodiment generates a first management number, associates this first management number with the data, and stores them in the storage unit 122. In the following description, the information including the 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) together with the data to the master station 200. In this case, as will be described later, the first management number uses the value of the healthy counter (hereinafter referred to as the first healthy count value C1) that can be used when diagnosing the communication state (performing a healthy check) on the master station side.

[0033] Next, the configuration and operation of the master station 200 will be described. The master station 200 is composed of a CPU module 210, a transmission module 220, and an IF module 230. The transmission module 220 is a computer that can execute software (stored program) by itself. The transmission module 220 has an arithmetic processing unit 221 such as a microcomputer that executes software, a storage unit 222 such as a flash memory that stores a ROM for storing programs and input data, and an IF 223 for communicating with the CPU module 210.

[0034] The hardware configuration of this transmission module 220 is the same as that of the transmission module 120 of the slave station 101. The transmission module 220 receives the data transmitted from the slave station 101 via the port 124 and the first healthy count value C1, generates a second healthy count value C2, which is the management number on the master station side, based on the first healthy count value C1, and records (stores) the received data together with this second healthy count value C2 in the storage unit 222. Further, the transmission module 220 performs a conversion for passing 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 IF223. 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.

[0035] In this embodiment, the CPU module 210 transmits the received data D and the second healthy count value C2 (data information) to the PLC 400 via the IF module 230.

[0036] The PLC 400 is connected to the IF module 230 of the master station 200, and this PLC 400 is also connected to the monitoring and control device 500. That is, the data information (data D and the second healthy count value C2) transmitted from the master station 200 is once input to the PLC 400 and then transmitted to the monitoring and control device 500 via the PLC 400.

[0037] The monitoring and control device 500 receives the data information transmitted from the master station 200 via the PLC 400, that is, the data D and the second healthy count value C2, and stores them in the storage unit 530 via the IF 510.

[0038] Here, the monitoring and control device 500 has the function of a computer. Therefore, when a computer is provided at a higher level of the system, instead of providing the monitoring and control device 500 independently as shown in FIG. 1, the upper-level computer may be used. In that case, the configuration of the entire system can be simplified, and there is also an advantage in terms of cost.

[0039] In addition, the monitoring and control device 500 can also be realized by using an external server such as a cloud service for part or all of the monitoring and control functions. That is, for example, the monitoring data information transmitted from the master station 200 of the telemeter is stored in an external server, and on the monitoring-side terminal device (such as a personal computer or a smartphone), the data information stored in the external server is obtained via the Internet or the like, and the terminal device executes monitoring and control based on the data information. Also, a configuration may be adopted in which not only data recording but also the monitoring and control function is performed on the server side, and the terminal device can obtain the monitoring and control result. By using such a cloud service, it is possible to reduce the equipment investment cost of the entire monitoring and control system.

[0040] Next, with reference to FIG. 2, the operation processing content when no communication abnormality has occurred (normal time) will be described. Note that the system configurations of FIGS. 1 and 2 are the same.

[0041] The CPU module 110 of the slave station 101 inputs the data D collected by a sensor or the like (not shown) and transmits it to the transmission module 120. The transmission module 120 creates (generates) the value of the healthy counter (the 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) from the port 124 via the communication line 300 to the master station 200.

[0042] At the master station 200 (specifically, the transmission module 220), the data information (data D and the first healthy count value C1) transmitted from the slave station 101 is received by the transmission module 220 via the port 224. When the transmission module 220 receives the data information from the slave station 101, it generates the second healthy count value C2, which is the management number at the master station, based on the first healthy count value C1. The transmission module 220 records (stores) the data information in which the data D and the second healthy count value C2 are set in the storage unit 222. The first healthy count value C1 is also recorded.

[0043] Subsequently, the arithmetic processing unit 221 of the transmission module 220 of the master station 200 performs conversion for passing the data information (data D and the second healthy count value C2) recorded in the storage unit 222 to the CPU module 210. Then, this data information is transmitted to the CPU module 210 via the IF223.

[0044] Also, the transmission module 220 (arithmetic processing unit 221) determines that the communication state is normal on the condition that data information has been 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 time, and it is confirmed that no communication abnormality has occurred (that is, it is normal). Note that if the first healthy count value C1 is not updated within a predetermined time, it is determined that there is a communication abnormality, but the operation processing in case of communication abnormality will be described later.

[0045] The CPU module 210 transmits the data information (received data D and the second healthy count value C2) to the PLC 400 via the IF module 230.

[0046] The PLC 400 transmits this received data information to the IF510 of the monitoring control device 500.

[0047] The monitoring control device 500 (arithmetic processing unit 520) records (stores) the data information (data D and the second healthy count value C2) acquired via the IF510 in the storage unit 530.

[0048] Also, 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 time, and confirms that the communication is being performed normally because the update is continuously performed. Thereby, also in the monitoring control device 500, it is possible to monitor that the communication state is normal.

[0049] In this way, when communication is carried out normally, the data information (data D and healthy count value C2) transmitted from the slave station 101 to the master station 200 is recorded in the monitoring and control device 500 via the PLC 400. Based on this recorded data information (data D and the second healthy count value C2), the monitoring and control device 500 executes monitoring and control.

[0050] Next, with reference to FIG. 3, the operation processing in the case of communication abnormality (for example, when the communication line 300 is disconnected) between the slave station and the master station will be described.

[0051] Whether a communication abnormality has occurred can be determined by the master station 200 (transmission module 220) based on the fact that the continuously received and recorded data information cannot be received within a predetermined time, thereby determining a communication abnormality. In this embodiment, it is determined based on whether the first healthy count value C1 is updated within a predetermined time. That is, it is determined that a communication abnormality has occurred when the first healthy count value C1 is not updated within a predetermined time. The first healthy count value C1 and the second healthy count value C2 at the time point when it is determined that a communication abnormality has occurred (when a communication abnormality occurs) are stored in the storage unit 222 as information indicating the time point when the communication abnormality occurs.

[0052] 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 there is a communication abnormality. Further, the operation of transmitting the data information recorded in the storage unit 122 to the master station 200 is continued. That is, the same operation as in the case of normal communication is continued. By recording data regardless of the presence or absence of such a communication abnormality, when the communication state is restored later, it becomes possible to transmit the data during the communication abnormality period to the master station.

[0053] The master station 200 (specifically, the transmission module 220) determines that there is a communication abnormality by confirming that the first healthy counter C1 received from the slave station 101 is not updated. As the start time of the communication abnormality, it records the values of the healthy counter C1 and the healthy counter C2 at that time in the storage unit 222. Also, it passes the data and the second healthy count value C2 at that time to the CPU module 210.

[0054] The CPU module 210 transmits the data information (data D and the second healthy count value C2) at that time to the PLC 400 via the IF module 230. That is, it transmits the data information (data D and the second healthy count value C2) at the time of the communication abnormality.

[0055] The PLC 400 transmits this data information to the monitoring control device 500.

[0056] The monitoring control device 500 records the data information (data D and the second healthy count value C2) obtained via the IF 510 in the storage unit 530. Then, it checks the state of the recorded second healthy count value C2, and can determine that there is a communication abnormality when the second healthy count value C2 is not updated within a predetermined time. That is, when a communication abnormality occurs, the data information transmitted from the master station 200 is interrupted, so by monitoring the state of the second healthy count value C2 included in that data information, it is possible to determine the occurrence of a communication abnormality. When the second healthy count value C2 is not updated within a predetermined time, the monitoring control device 500 records the second healthy count value C2 at that time in the storage unit 530 as the information at the time of the communication abnormality.

[0057] In this way, when a communication abnormality occurs, the master station 200 and the monitoring control device 500 can determine that "a communication abnormality has occurred".

[0058] Next, with reference to FIG. 4, the processing operations in the state where the communication abnormality state has been resolved (at the time of communication abnormality resolution) will be described.

[0059] Here, as described above, regardless of the change in the communication state, the transmission module 120 of the slave station 101 continues the recording operation of data information (data D and the first healthy count value C1) to the storage unit during the communication anomaly period from the occurrence of the communication anomaly to the resolution of the communication anomaly, as well as the data transmission operation of transmitting the data information to the master station 200, just as in the normal state.

[0060] When the communication anomaly is resolved, the master station 200 (transmission module 220) can receive the data D and the first healthy count value from the slave station 101 again. Therefore, it can confirm the reception of the data information (data and the first healthy count value C1) and determine that the communication anomaly has been resolved, that is, the communication has been restored. The transmission module 220 records the first healthy count value C1 received from the slave station 101 at the start of the re-reception into the storage unit 222 as information indicating the time when the communication anomaly is resolved.

[0061] When the master station 200 (transmission module 220) determines that the communication anomaly has been resolved due to starting to receive the data information from the slave station 101 again, it sends a transmission request R for the data information (data D and the first healthy count value C1) during the communication anomaly period from the start of the communication anomaly to the time when the communication anomaly is resolved to the slave station 101 (transmission module 120). This transmission request R includes the first healthy count value C1 at the time of the occurrence of the communication anomaly and the first healthy count value C1 at the time of the resolution of the communication anomaly.

[0062] The slave station 101 (transmission module 120) can grasp the range of the data information (the data information recorded during the communication anomaly period) during the communication anomaly period based on the first healthy count value C1 at the time of the occurrence of the communication anomaly included in this transmission request R and the first healthy count value C1 at the time of the resolution of the communication anomaly. The slave station 101 extracts the data information during the communication anomaly period from the data recorded in the storage unit 122 and transmits it to the master station 200.

[0063] When the transmission module 220 of the master station 200 receives data information (data D and the first healthy count value C1) during the communication abnormal period from the slave station 101, it generates a 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 abnormal period in the storage unit 222. Also, the transmission module 220 transmits the data information during the communication abnormal period to the CPU module 210.

[0064] Also, the transmission module 220 delivers both the latest data information (data D and the second healthy count value D2) recorded based on the latest data information transmitted from the slave station to the CPU module 210. After that, the operations during normal communication will be executed. That is, the transmission module 220 delivers the latest data information to the CPU module 210 based on the data information from the slave stations received one after another. Note that the transmission module 220 performs information conversion necessary when delivering data information to the CPU module 210.

[0065] The master station 200 (CPU module 210) transmits the data information (data D and the second healthy count value C2) during the communication abnormal period and the latest data information to the PLC 400 via the IF module 230.

[0066] The PLC 400 transmits the data information during the communication abnormal period and the latest data information received from the master station 200 to the monitoring and control device 500.

[0067] The monitoring and control device 500 records these data information (data information during the communication abnormal period and the latest data information) obtained via the IF 510 in the storage unit 530. That is, the data information during the communication abnormal period (data during the communication abnormal period and the second healthy count value) is recorded following the information recorded at the time of communication abnormal occurrence in the storage unit 530, and the latest information is recorded following the information during the communication abnormal period. Note that thereafter, as described in the case of normal operation, the data information transmitted successively from the master station side is sequentially recorded in the storage unit 530.

[0068] As a result, the master station 200 of the telemeter and the monitoring and control device 500 can record data information (data D and the healthy count value C2) during the communication abnormal period in the internal storage unit. Therefore, even when a communication abnormality occurs, the data information during the communication abnormal period can be obtained and recorded when the communication abnormality is resolved, so that monitoring and control can be performed without data loss.

[0069] As described above, according to the embodiment of the present invention, even when some communication abnormality occurs between the master station and the slave station of the telemeter, it is possible to transmit the data information during the communication abnormal period from the slave station to the master station when the communication abnormality is resolved. Therefore, it is possible to realize highly reliable monitoring and control that does not cause data loss.

[0070] In addition, in the embodiment of the present invention, a management number is generated together with the data and the data information is recorded, which facilitates the management of the data. Furthermore, by adopting the healthy count value that can execute the healthy check as this management number, it is possible to easily determine the communication abnormality in the master station 200. Also, by transmitting this management data to the monitoring and control device 500 as well, it becomes possible to manage the communication abnormality also in the monitoring and control device.

Description of Reference Numerals

[0071] 101, 102, 10N... slave stations, 110... CPU module, 120... transmission module, 121... arithmetic processing unit, 122... storage unit, 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 and control device, 510... IF, 520... arithmetic processing unit, 530... storage unit

Claims

1. 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 abnormality has occurred when the data from the slave station is not received within a predetermined time, and then determines that the communication abnormality has been resolved when the transmission of the data from the slave station is started. When it is determined that the communication abnormality has been resolved, a transmission request for the data during the communication abnormality period from the occurrence of the communication abnormality to the resolution of the communication abnormality is made to the slave station, the data during the communication abnormality period is received from the slave station, and the data during the communication abnormality period is recorded. The slave station generates a first management number for data management and transmits the data to the master station together with the first management number. The master station generates a second management number, which is a management number on the master station side, based on the first management number, and records the data from the slave station together with the second management number. The first management number is a first healthy check value for performing a healthy check, and the master station determines that the communication abnormality has occurred when the first healthy check value is not updated within the predetermined time. The master station uses a second healthy check value as the second management number and records the second healthy check value together with the data. The master station is a telemeter that transmits the data to a monitoring control device that performs monitoring control.

2. A monitoring control system comprising 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 via a communication line, and a monitoring control device that receives and records the data recorded by the master station and performs monitoring 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 monitoring and control device, determines that a communication abnormality has occurred when the data is not transmitted from the slave station within a predetermined time, and then determines that the communication abnormality has been resolved when the reception of the data from the slave station starts. When it is determined that the communication abnormality has been resolved, a data transmission request during the communication abnormality period from the occurrence of the communication abnormality to the resolution of the communication abnormality is made to the slave station, the data during the communication abnormality period is received from the slave station, the data during the communication abnormality period is recorded, and the data is transmitted to the monitoring and control device. The monitoring and control device records the data during the transmitted communication abnormality period. The slave station generates a first management number for data management, transmits the data to the master station together with the first management number, the master station generates a second management number which is a management number on the master station side based on the first management number, and records the data from the slave station together with the second management number. The first management number is a first healthy check value for performing a healthy check, and the master station determines the occurrence of the communication abnormality when the first healthy check value is not updated within a predetermined time. The master station uses a second healthy check value as the second management number, transmits the second healthy check value to the monitoring and control device together with the data, and the monitoring and control device is a monitoring and control system that confirms the occurrence of the communication abnormality based on the transmitted second healthy check value.

3. In the monitoring and control system according to claim 2, A monitoring and control system characterized in that a PLC having a relay function for receiving the data transmitted by the master station and transmitting the data to the monitoring and control device is provided.

4. In the monitoring and control system according to claim 2, A monitoring and control system characterized in that at least some functions of the monitoring and control device are provided in an external server.

5. In the monitoring and control system according to claim 2, the monitoring and control device is a host computer, and the monitoring and control system is characterized by this.

6. 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, the master station receiving and recording the data recorded by the master station, and performing monitoring and control based on the recorded data, and the slave station transmits the data to the master station, and the master station determines that a communication abnormality has occurred when the data is not transmitted from the slave station within a predetermined time, and then determines that the communication abnormality has been resolved when the reception of the data from the slave station has started. When the master station determines that the communication abnormality has been resolved, the master station requests the slave station to transmit the data during the communication abnormality period from the time when the communication abnormality occurred to the time when the communication abnormality was resolved, receives the data during the communication abnormality period from the slave station, and records the data during the communication abnormality period. The slave station generates a first management number for data management, transmits the data to the master station together with the first management number, and the master station generates a second management number which is a management number on the master station side based on the first management number, and records the data from the slave station together with the second management number. The first management number is a first healthy check value for performing a healthy check, and the master station determines that the communication abnormality has occurred when the first healthy check value is not updated within a predetermined time. At the master station, a second healthy check value is used as the second management number, and the second healthy check value is recorded together with the data. The master station is a monitoring and control method for transmitting the data to a monitoring and control device that performs monitoring and control.

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