JP7418979B2 - Telemeters and telemeter systems - Google Patents

Description

Embodiments of the present invention relate to telemeters and telemeter systems.

In order to realize automatic operation of sewage plants, etc., for example, DCS (Distributed Control System) is used, in which multiple equipment (measuring instruments, pumps, etc.) and control devices that control them are connected via a network. ) has been constructed. In the DCS, a control device transmits various information collected from equipment to, for example, an HMI (Human Machine Interface) and/or an information processing server.

When a device to be controlled is located in a remote location, a telemeter system is constructed that includes a master station control device and a slave station control device. The master station control device is housed in a LAN (Local Area Network) to which an HMI and an information processing server are connected, and is connected to the slave station control device via a communication network. The slave station control device collects measurement results from equipment provided as a monitoring target, and transmits the collected information to the master station control device.

In a conventional telemeter system, a master station control device and a slave station control device are connected one-to-one or one-to-N using analog telephone lines. When the master station control device and the slave station control device are connected 1:N via an analog line, a line switching device is used, and the line switching device allows the slave station control device to communicate with the master station control device. , for example, can be switched cyclically.

Incidentally, recently, it has been proposed to replace the connection between the master station control device and the slave station control device from an analog line to a digital line. However, the number of slave station control devices that can be connected to one master station control device cannot be as large as in the case of connections using analog lines. This is because the communication module installed in the master station control device has a small number of sockets, and when the master station control device attempts to open a communication session with a slave station control device for transmission and reception, two sockets are required. It is.

JP2015-35080A

Therefore, an object of the present invention is to provide a telemeter and a telemeter system that can be connected to a larger number of slave station control devices without hindrance to operation.

According to an embodiment, the telemeter system includes a first telemeter and a second telemeter. The first telemeter includes a communication module that can be configured with a plurality of sockets, and transmits a signal from each of the plurality of sockets other than the socket to any one of the plurality of second telemeters, and transmits a signal to any one of the plurality of second telemeters. Storing data regarding the equipment included in the received signal in a storage area allocated to the second telemeter that transmitted the signal received at the socket, among the storage areas allocated to each of the plurality of second telemeters. let The second telemeter transmits and receives digital signals to and from the first telemeter. At least two or more second telemeters among the plurality of second telemeters transmit a signal to one socket that is a preset destination among the plurality of sockets of the communication module.

FIG. 1 is a block diagram showing the functional configuration of a supervisory control system according to this embodiment and a controlled object controlled by this supervisory control system. FIG. 2 is a diagram showing the functional configuration of the master station control device and the slave station control device shown in FIG. 1, and the communication connection between the master station control device and the slave station control device. FIG. 3 is a flowchart showing the operation when the master station control device shown in FIG. 2 stores abnormal log data. FIG. 4 is a diagram showing a general connection between a master station control device and a slave station control device.

Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of the functional configuration of a supervisory control system 1 according to the present embodiment and control objects 30-1 to 30-n controlled by this supervisory control system 1. The monitoring control system 1 shown in FIG. 1 is an example of a DCS, and collects measurement information from a plurality of equipment installed in control objects 30-1 to 30-n, and based on the collected measurement information, This is a system that realizes automatic operation from -1 to 30-n.

The controlled objects 30-1 to 30-n shown in FIG. 1 are, for example, locations away from the base station where the HMI (Human Machine Interface) 11, the information processing server 12, etc. are installed (hereinafter referred to as remote locations). This is a sewage plant operated in In a sewage plant, sewage (water to be treated) such as domestic wastewater or industrial wastewater is treated using, for example, activated sludge to remove organic matter and the like. In addition, in this embodiment, the control target of the supervisory control system 1 is not limited to a sewage plant. Industrial plants such as chemicals, plants that manage and control wellheads and their surroundings such as gas fields and oil fields, plants that manage and control power generation such as hydropower, thermal power, nuclear power, etc., plants that manage and control energy generation such as solar power and wind power. , a plant that manages and controls water supply, dams, etc.

The controlled objects 30-1 to 30-n are provided with various equipment 31-1 to 31-n for managing the equipment within the controlled objects. When the controlled objects 30-1 to 30-n are sewage plants, the equipment 31-1 to 31-n includes, for example, sensors such as water level sensors, turbidity sensors, and flow rate sensors, pumps, valves, compressors, and opening/closing gates. Note that the equipment is not limited to these, and does not necessarily need to include all of these.

The supervisory control system 1 shown in FIG. 1 includes, for example, an HMI 11, an information processing server 12, a master station control device 21, a master station router 22, slave station routers 23-1 to 23-n, and a slave station control device 24-1. ~24-n. The HMI 11, the information processing server 12, and the master station control device 21 are housed in a control LAN (Local Area Network). The control LAN is constructed using a general-purpose communication protocol such as Ethernet (registered trademark), for example.

Note that FIG. 1 illustrates an example in which one HMI 11 and one information processing server 12 are connected to the control LAN. The number of HMI 11 and information processing server 12 connected to the control LAN is not limited to one each, and a plurality of them may be provided.

The HMI 11 includes a display, and displays the current states of the controlled objects 30-1 to 30-n, for example, in chronological order on the display. Specifically, for example, the HMI 11 receives a process signal transmitted from the master station control device 21. A process signal is, for example, a signal that includes data necessary for process control. Generated based on. The HMI 11 detects an abnormality in the controlled objects 30-1 to 30-n to which the equipment 31-1 to 31-n are installed, based on the data of the equipment 31-1 to 31-n included in the received process signal. Determine whether it has occurred. The HMI 11 displays a preset type of information or a type of information specified by the operator on the display based on the received process signal, the determination result of abnormality occurrence, or a combination of at least one of these. .

The HMI 11 receives an operation from an operator regarding the content displayed on the display, and controls the master station control device 21 based on the received operation. Specifically, the HMI 11 generates an operation signal based on an operation input by an operator. The operation signal is, for example, a signal to turn on or off any of the equipment 31-1 to 31-n. The HMI 11 transmits the generated operation signal to the master station control device 21 in a communication format compatible with a general-purpose communication protocol using, for example, TCP (Transmission Control Protocol) or UDP (User Datagram Protocol).

The information processing server 12 manages data generated within the monitoring control system 1. Specifically, for example, the information processing server 12 stores a process signal transmitted from the master station control device 21 or an operation signal transmitted from the HMI 11.

The master station control device 21 is, for example, a PLC (Programmable Logic Controller). The master station control device 21 controls the equipment 31-1 to 31-n provided in the controlled objects 30-1 to 30-n, such as sensors such as water level sensors, turbidity sensors, and flow rate sensors, pumps, and valves. , compressor, opening/closing gate, etc., are controlled via slave station control devices 24-1 to 24-n. Specifically, for example, the master station control device 21 generates control signals for the equipment 31-1 to 31-n based on information signals transmitted from the slave station control devices 24-1 to 24-n. The master station control device 21 transmits the generated control signal to the slave station control device 24 connected to the equipment 31 to be controlled, using, for example, TCP or UDP. Further, the master station control device 21 transmits the operation signal transmitted from the HMI 11 to the slave station control device 24 connected to the equipment 31 to be operated, using, for example, TCP or UDP. Note that, for example, the equipment 31 whose operation has been stopped by the operation signal is not subject to control by the master station control device 21.

The master station control device 21 generates a process signal based on, for example, data regarding the equipment 31-1 to 31-n transmitted from the slave station control devices 24-1 to 24-n. The master station control device 21 transmits the generated process signal to the HMI 11 and/or the information processing server 12 at a preset period. At this time, the master station control device 21 transmits the process signal in a communication format compatible with a general-purpose communication protocol using, for example, TCP or UDP.

The master station control device 21 is a telemeter or a first This is an example of a telemeter. The telemeter system 20 is a system that transmits and receives data between the slave station control devices 24-1 to 24-n provided at remote locations and the master station control device 21. The master station control device 21 is connected to an external network via the master station router 22.

Although FIG. 1 shows an example in which one master station router 22 is connected to the master station control device 21, the number of master station routers connected to the master station control device 21 is one. Not limited. A plurality of master station routers may be provided, and each master station router may be connected to any one of the slave station routers 23-1 to 23-n.

The slave station control devices 24-1 to 24-n control equipment 31-1 to 31-n provided in the control targets 30-1 to 30-n under control from the master station control device 21.

The slave station control devices 24-1 to 24-n are connected to external networks via slave station routers 23-1 to 23-n, respectively. The slave station control devices 24-1 to 24-n are examples of second telemeters. The slave station control devices 24-1 to 24-n acquire the data acquired by the equipment 31-1 to 31-n, and send transmission signals including the acquired data to the master station using, for example, TCP or UDP. It is transmitted to the control device 21.

FIG. 2 shows an example of the functional configuration of the master station control device 21 and slave station control device 24-1 shown in FIG. 1, and communication connections between the master station control device 21 and slave station control devices 24-1 to 24-n. It is a schematic diagram showing an example.
The master station control device 21 shown in FIG. 2 includes, for example, a processing circuit 211, a storage section 212, and communication modules 213 and 214.

The processing circuit 211 includes, for example, a CPU (Central Processing Unit), a memory used by the CPU when executing processing, and the like. The processing circuit 211 realizes, for example, the functions of the control section 2111, the communication control section 2112, and the transmission abnormality logging section 2113 by causing the CPU to execute the application program stored in the storage section 212. Note that the processing circuit 211 may include an FPGA (Field Programmable Gate Array) or the like that executes predetermined processing under control from the CPU.

The control unit 2111 controls the equipment 31-1 to 31-n provided in the control targets 30-1 to 30-n via the slave station control devices 24-1 to 24-n. Specifically, the control unit 2111 generates control signals for the equipment 31-1 to 31-n based on information signals transmitted from the slave station control devices 24-1 to 24-n, for example.

The communication control unit 2112 controls communication via the control LAN and communication with the slave station control devices 24-1 to 24-n. Specifically, for example, the communication control unit 2112 controls the communication modules 213 and 214 to communicate with the HMI 11 and the slave station control devices 24-1 to 24-n. The communication control unit 2112 receives the operation signal transmitted from the HMI 11 through the communication module 213. The communication control unit 2112 transmits the received operation signal from the communication module 214 to the slave station control device 24 that controls the equipment 31 that requires operation, using TCP or UDP, for example. Furthermore, the communication control unit 2112 transmits the control signal generated by the control unit 2111 from the communication module 214 to the slave station control device 24 that controls the equipment 31 to be controlled, using TCP or UDP, for example. .

Furthermore, the communication control unit 2112 receives transmission signals transmitted from the slave station control devices 24-1 to 24-n using the communication module 214. The communication control unit 2112 transmits a process signal based on data regarding the equipment 31-1 to 31-n included in the received transmission signal from the communication module 213 to the HMI 11.

The transmission abnormality logging unit 2113 stores abnormality log data, for example, when signals transmitted from the slave station control devices 24-1 to 24-n are not normally received.

The storage unit 212 is realized by, for example, a nonvolatile storage circuit such as an HDD or SSD that stores various information, or a volatile storage circuit such as an SDRAM or SRAM that is held by a battery power source or an AC/DC power source. Ru. Note that the storage unit 212 may be a drive device or the like that reads and writes various information to and from a portable storage medium such as a CD-ROM, a DVD, and a flash memory. The storage unit 212 stores, for example, an application program according to the present embodiment.

Furthermore, the storage unit 212 stores data included in transmission signals transmitted from each of the slave station control devices 24-1 to 24-n. Specifically, for example, in the storage unit 212, a storage area is allocated to each of the slave station control devices 24-1 to 24-n. The storage unit 212 stores data included in the transmission signals transmitted from each of the slave station control devices 24-1 to 24-n in corresponding areas.

The communication module 213 is a general-purpose communication module such as an Ethernet module. The communication module 213 is connected to the control LAN via, for example, a cable.

The communication module 214 is a general-purpose communication module such as an Ethernet module. In the communication module 214, a communication session is identified, for example, by setting a protocol, an IP address, and a port number. In this embodiment, an identification unit identified by a protocol, an IP address, and a port number is called a socket. Generally, in the communication module 214, one socket is required to transmit a signal to one destination, and one socket is required to receive a signal from one receiving source.

The communication module 214 provided in the master station control device 21 as a PLC often has a small number of sockets. For example, in the communication module 214 shown in FIG. 2, eight sockets can be configured.

The communication module 214 includes, for example, a CPU, and is set to receive at least one of the signals transmitted from the slave station control devices 24-1 to 24-n through one socket. Specifically, for example, the first socket 2141 is preset as a transmission destination when the slave station control device 24-1, slave station control device 24-2, and slave station control device 24-3 transmit transmission signals. has been done. Further, the fifth socket 2145 is set in advance as a transmission destination when the slave station control device 24-4, slave station control device 24-5, and slave station control device 24-6 transmit transmission signals.

On the other hand, control signals and the like are transmitted to the slave station control devices 24-1 to 24-n using one socket. Specifically, for example, the second socket 2142 is set in advance so that the slave station control device 24-1 is the transmission destination. Further, the third socket 2143 is set in advance so that the slave station control device 24-2 is the transmission destination. Further, the fourth socket 2144 is set in advance so that the slave station control device 24-3 is the transmission destination. Further, the sixth socket 2146 is set in advance so that the slave station control device 24-4 is the transmission destination. Further, the seventh socket 2147 is set in advance so that the slave station control device 24-5 is the transmission destination. Further, the eighth socket 2148 is set in advance so that the slave station control device 24-6 is the transmission destination.

The slave station control device 24-1 shown in FIG. 2 includes, for example, a processing circuit 241, a storage section 242, and a communication module 243. Note that the slave station control devices 24-2 to 24-n have the same configuration as the slave station control device 24-1, but in FIG. 2, only the configuration of the slave station control device 24-1 is shown as an example. There is. Further, the slave station control device 24-1 has a communication module for communicating with the equipment 31-1, but it is not shown in FIG. 2.

The processing circuit 241 includes, for example, a CPU and a memory used when the CPU executes processing. The processing circuit 241 realizes, for example, the functions of the control section 2411, the communication control section 2412, and the transmission abnormality logging section 2413 by causing the CPU to execute the application program stored in the storage section 242. Note that the processing circuit 241 may include an FPGA or the like that executes predetermined processing under control from the CPU.

The control unit 2411 controls the equipment 31-1 provided in the controlled object 30-1, for example, in accordance with a control signal from the master station control device 21.

The communication control unit 2412 controls communication with the master station control device 21 and communication with the equipment 31-1. Specifically, for example, the communication control unit 2412 controls the communication module 243 to communicate with the master station control device 21. The communication control unit 2412 receives a control signal or an operation signal transmitted from the master station control device 21 through the communication module 243. Further, the communication control unit 2412 transmits a transmission signal including data transmitted from the equipment 31-1 from the communication module 243 to the master station control device 21 using, for example, TCP or UDP.

The transmission abnormality logging unit 2413 stores abnormality log data, for example, when a control signal or the like transmitted from the master station control device 21 is not normally received.

The storage unit 242 is realized by, for example, a nonvolatile storage circuit such as an HDD or SSD that stores various information, or a volatile storage circuit such as an SDRAM or SRAM that is held by a battery power source or an AC/DC power source. Ru. Note that the storage unit 242 may be a drive device or the like that reads and writes various information to and from a portable storage medium such as a CD-ROM, a DVD, and a flash memory. The storage unit 242 stores, for example, an application program according to this embodiment.

The communication module 243 is a general-purpose communication module such as an Ethernet module. The communication module 243 shown in FIG. 2 includes, for example, a CPU, and is provided with a first socket 2431 for reception and a second socket 2432 for transmission. Specifically, for example, the first socket 2431 is set in advance as a socket for receiving a signal transmitted from the second socket 2142 of the master station control device 21. Further, the second socket 2432 is set in advance as a socket for transmitting a signal to the first socket 2431 of the master station control device 21.

Next, communication operations between the master station control device 21 and the slave station control devices 24-1 to 24-n in the above configuration will be explained.
(Signal transmission from slave station control devices 24-1 to 24-n to master station control device 21)
The slave station control device 24-1 acquires measurement information from the connected equipment 31-1, for example, at a preset period. The processing circuit 241 of the slave station control device 24-1 controls the communication module 243 using the communication control section 2412. The communication module 243 generates a digital transmission signal including the acquired measurement information according to a predetermined communication program, and transmits the generated transmission signal to the master station control device 21 at a preset period. At this time, the communication module 243 sends information that the second socket 2432 of the slave station control device 24-1 is the transmission source and information that the first socket 2141 of the master station control device 21 is the transmission destination. Include in the transmitted signal. Note that the cycle at which the slave station control device 24-1 transmits a transmission signal to the master station control device 21 may be longer than the cycle at which the slave station control device 24-1 acquires measurement information from the equipment 31-1. do not have.

The transmission signal transmitted from the slave station control device 24-1 is transmitted to the master station control device 21 via the slave station router 23-1 and the master station router 22.
The master station control device 21 receives the transmission signal supplied from the master station router 22 through the first socket 2141 of the communication module 214 .

Similarly, the slave station control devices 24-2 and 24-3 acquire measurement information from the connected equipment 31-2 and 31-3, for example, at a preset period. The slave station control devices 24-2 and 24-3 generate transmission signals including the acquired measurement information according to a predetermined communication program, and transmit the generated transmission signals to the master station control device 21 at preset intervals. do. At this time, the slave station control device 24-2 receives information that the second socket of the slave station control device 24-2 is the transmission source and information that the first socket 2141 of the master station control device 21 is the transmission destination. information is included in the transmitted signal. The slave station control device 24-3 also receives information that the second socket of the slave station control device 24-3 is the transmission source, and information that the first socket 2141 of the master station control device 21 is the transmission destination. and is included in the transmitted signal.

The transmission signals transmitted from the slave station control devices 24-2 and 24-3 are transmitted to the master station control device 21 via the slave station routers 23-2 and 23-3 and the master station router 22.
The master station control device 21 receives the transmission signal supplied from the master station router 22 through the first socket 2141 of the communication module 214 .

Similarly, the slave station control devices 24-4 to 24-6 acquire measurement information from the connected equipment 31-4 to 31-6, for example, at a preset period. The slave station control devices 24-4 to 24-6 generate transmission signals including the acquired measurement information according to a predetermined communication program, and transmit the generated transmission signals to the master station control device 21 at preset intervals. do. At this time, the slave station control device 24-4 receives information that the second socket of the slave station control device 24-4 is the transmission source and information that the fifth socket 2145 of the master station control device 21 is the transmission destination. information is included in the transmitted signal. The slave station control device 24-5 also receives information that the second socket of the slave station control device 24-5 is the transmission source, and information that the fifth socket 2145 of the master station control device 21 is the transmission destination. and is included in the transmitted signal. The slave station control device 24-6 also receives information that the second socket of the slave station control device 24-6 is the transmission source, and information that the fifth socket 2145 of the master station control device 21 is the transmission destination. and is included in the transmitted signal.

The transmission signals transmitted from the slave station control devices 24-4 to 24-6 are transmitted to the master station control device 21 via the slave station routers 23-4 to 23-6 and the master station router 22.
The master station control device 21 receives the transmission signal supplied from the master station router 22 through the fifth socket 2145 of the communication module 214.

When the master station control device 21 receives a transmission signal at the first socket 2141 or the fifth socket 2145 of the communication module 214, the communication control unit 2112 stores data related to equipment included in the received transmission signal in a predetermined location in the storage unit 212. is stored in the area. Specifically, for example, the communication control unit 2112 acquires information regarding the transmission source included in the transmission signal received by the first socket 2141 or the fifth socket 2145. The communication control unit 2112 stores data related to the equipment included in the transmission signal in a storage area allocated to the source of the received transmission signal among the storage areas set in the storage unit 212.

More specifically, for example, when the transmission source of the transmission signal received by the first socket 2141 is the slave station control device 24-1, the communication control unit 2112 controls the slave station from the storage area of the storage unit 212. The data regarding the equipment 31-1 included in the transmission signal is stored in the storage area allocated to the control device 24-1. Furthermore, if the transmission source of the transmission signal received by the first socket 2141 is the slave station control devices 24-2, 24-3, the communication control unit 2112 stores the slave station control device in the storage area of the storage unit 212. The data regarding the equipment 31-2 and 31-3 included in the transmission signal is stored in the storage areas assigned to 24-2 and 24-3. Furthermore, if the transmission source of the transmission signal received by the fifth socket 2145 is the slave station control devices 24-4 to 24-6, the communication control unit 2112 stores the slave station control device in the storage area of the storage unit 212. The data regarding the equipment 31-4 to 31-6 included in the transmission signal is stored in the storage areas allocated to 24-4 to 24-6.

Note that when two or more transmission signals are received substantially simultaneously by a single socket, data included in the signal received first is stored in the storage unit 212 first. While processing is being performed on the first received signal, later received signals are held, for example, in a buffer (not shown) provided in the communication module 214.

When the transmission signals transmitted from the slave station control devices 24-1 to 24-6 cannot be received normally, the master station control device 21 causes the transmission abnormality logging section 2113 to store the abnormality log data in the storage section 212. .
FIG. 3 is a flowchart showing an example of the operation when the master station control device 21 shown in FIG. 2 stores abnormal log data in the storage unit 212.

First, the transmission abnormality logging unit 2113 of the master station control device 21 determines whether a transmission signal transmitted from any one of the slave station control devices 24-1 to 24-6 has been normally received (step S31). ). Specifically, for example, the transmission abnormality logging unit 2113 determines whether the next transmission signal has been received within a predetermined time after receiving the transmission signal from the slave station control device immediately before. The predetermined period of time is, for example, a period of time with a certain amount of margin added to the predetermined cycle. Further, for example, the transmission abnormality logging unit 2113 may use an error identifier included in the transmission signal to determine whether an abnormality has occurred in the transmission signal.

If it is determined that the signal has not been received normally (Yes in step S31), the transmission abnormality logging unit 2113 determines that an abnormality has occurred in the transmission of the signal, and records data indicating that the transmitted signal was not received normally. It is stored in the storage unit 212 as abnormal log data (step S32). The abnormality log data is stored in association with, for example, the time when the abnormality occurred, the cause of the abnormality, the number of times the abnormality repeatedly occurred, and the like. Note that the collection of abnormal log data may be performed using the method described in Japanese Patent No. 5740332.

(Signal transmission from master station control device 21 to slave station control devices 24-1 to 24-n)
The processing circuit 211 of the master station control device 21 uses the control unit 2111 to generate, for example, a digital control signal for the equipment 31-1. The processing circuit 211 controls the communication module 214 using the communication control unit 2112. The communication module 214 converts the generated control signal into a format conforming to a predetermined communication protocol and transmits it to the slave station control device 24-1. At this time, the communication module 214 sends information that the second socket 2142 of the master station control device 21 is the transmission source and information that the first socket 2431 of the slave station control device 24-1 is the transmission destination. Convert control signals to include:

The control signal transmitted from the master station control device 21 is transmitted to the slave station control device 24-1 via the master station router 22 and the slave station router 23-1.
The slave station control device 24-1 receives the control signal supplied from the slave station router 23-1 through the first socket 2431.

Similarly, the processing circuit 211 of the master station control device 21 uses the control unit 2111 to generate a control signal for at least one of the equipment 31-2 to 31-6, for example. The communication module 214 converts the generated control signal into a format compliant with a predetermined communication protocol and transmits it to at least one of the slave station control devices 24-2 to 24-6. When the slave station control device 24-2 is the transmission destination, the communication module 214 sends information that the third socket 2143 of the master station control device 21 is the transmission source, and the first socket of the slave station control device 24-2. The control signal is converted to include information indicating that the destination is the destination. Further, when the slave station control device 24-3 is the transmission destination, the communication module 214 sends information that the fourth socket 2144 of the master station control device 21 is the transmission source and the fourth socket 2144 of the slave station control device 24-3. The control signal is converted to include information indicating that one socket is the destination. Furthermore, when the slave station control device 24-4 is the transmission destination, the communication module 214 sends information that the sixth socket 2146 of the master station control device 21 is the transmission source, and the information that the sixth socket 2146 of the master station control device 21 is the transmission source. The control signal is converted to include information indicating that one socket is the destination. Further, when the slave station control device 24-5 is the transmission destination, the communication module 214 sends information that the seventh socket 2147 of the master station control device 21 is the transmission source, and the information that the seventh socket 2147 of the slave station control device 24-5 is the transmission source. The control signal is converted to include information indicating that one socket is the destination. Further, when the slave station control device 24-6 is the transmission destination, the communication module 214 sends information that the eighth socket 2148 of the master station control device 21 is the transmission source, and the information that the eighth socket 2148 of the master station control device 21 is the transmission source, and The control signal is converted to include information indicating that one socket is the destination.

The control signal transmitted from the master station control device 21 is transmitted to the slave station control devices 24-2 to 24-6 via the master station router 22 and the slave station routers 23-2 to 23-6, respectively.
The slave station control device 24-2 receives the control signal supplied from the slave station router 23-2 through the first socket. Further, the slave station control device 24-3 receives a control signal supplied from the slave station router 23-3 through the first socket. Further, the slave station control device 24-4 receives a control signal supplied from the slave station router 23-4 through the first socket. Further, the slave station control device 24-5 receives a control signal supplied from the slave station router 23-5 through the first socket. Further, the slave station control device 24-6 receives a control signal supplied from the slave station router 23-6 through the first socket.

When the slave station control devices 24-1 to 24-6 cannot normally receive the transmission signal transmitted from the master station control device 21, the transmission abnormality logging section 2413 stores the abnormality log data in the storage section 242. .
The slave station control devices 24-1 to 24-6 perform operations similar to those of the master station control device 21 shown in FIG. 3, for example.
First, the transmission abnormality logging unit 2413 of the slave station control devices 24-1 to 24-6 determines whether or not the control signal etc. transmitted from the master station control device 21 has been normally received. Specifically, for example, the transmission abnormality logging unit 2413 determines whether the next control signal has been received within a predetermined time after receiving the control signal from the master station control device 21 immediately before. The predetermined period of time is, for example, a period of time with a certain amount of margin added to the predetermined cycle. Further, for example, the transmission abnormality logging unit 2413 may use an error identifier included in the control signal or the operation signal to determine whether an abnormality has occurred in the control signal or the operation signal.

If it is determined that the control signal has not been received normally, the transmission abnormality logging unit 2413 determines that an abnormality has occurred in the transmission of the signal, and stores data indicating that the control signal was not received normally in the storage unit as abnormal log data. 242.

As described above, in this embodiment, the master station control device 21 connects the socket of the communication module 214 and the slave station control device 24 on a one-to-one basis when transmitting a signal. On the other hand, when receiving a signal, the master station control device 21 connects the socket of the communication module 214 and the slave station control device 24 in a 1:N ratio. As a result, as shown in FIG. 2, the slave station control devices 24-1 to 24-6 are connected to the communication module 214, which can be configured with eight sockets.

FIG. 4 is a schematic diagram showing an example of a general connection between a master station control device and a slave station control device. As shown in FIG. 4, it is necessary to allocate two sockets of the communication module in order to communicate with the slave station control device in the vertical direction. Then, the maximum number of slave station control devices that can be connected to one master station control device is half the number of sockets of the communication module. For this reason, when the number of slave station control devices to be connected is large, it is necessary to add a master station control device, which causes an increase in the installation cost of the supervisory control system and an increase in the mounting space of the supervisory control system.

Since the master station control device 21 according to the present embodiment receives signals from a plurality of slave station control devices 24 through one socket of the communication module 214, it is compared with a case of a general configuration. This makes it possible to connect to many slave station control devices.

By the way, the master station control device 21 according to this embodiment does not transmit signals to a plurality of slave station control devices through one socket. When trying to send a signal to multiple slave station control devices using one socket, if the transmission to any one slave station control device is not carried out normally, the signal will not be transmitted to other slave station control devices until the timeout occurs which causes a transmission error. Signaling may not occur. In such a case, signal transmission to other slave station control devices will be delayed. In the master station control device 21 according to the present embodiment, by using one socket at a time for transmission, there is no delay in signal transmission to other normal slave station control devices even when a timeout occurs due to an abnormal transmission. In this way, by setting transmission to one-to-one and reception to one-to-N, it is possible to improve the safety and stability of plant monitoring and control, and to reduce costs.

Furthermore, in this embodiment, the master station control device 21 stores abnormality log data when it cannot normally receive transmission signals from the slave station control devices 24-1 to 24-n. This makes it possible to operate the plant safely.

Therefore, according to the master station control device 21 and the telemeter system 20 according to the present embodiment, it is possible to connect to a larger number of slave station control devices without hindrance to operation.

In the above embodiment, an example will be described in which the first socket 2141 of the communication module 214 of the master station control device 21 receives transmission signals of three lines transmitted from the slave station control devices 24-1 to 24-3. did. However, the number of lines that can be accepted by one socket is not limited to three. For example, the first socket 2141 receives transmission signals of seven lines transmitted from the slave station control devices 24-1 to 24-7, and the second to seventh sockets 2142 to 2147 receive transmission signals from the slave station control devices 24-1 to 24-7. 24-7, respectively. The number of lines that can be accepted by a single socket is determined by, for example, the signal transmission cycle, the signal capacity, the processing capacity of the communication module, the processing capacity of the processing circuit, and the like.

Furthermore, in this embodiment, the case where the master station control device 21 and the slave station control devices 24-1 to 24-n are connected in a 1:N ratio has been described as an example. The master station control device 21 may be connected one-to-one with the slave station control device 24.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

1... Monitoring control system 12... Information processing server 20... Telemeter system 21... Master station control device 211... Processing circuit 2111... Control section 2112... Communication control section 2113... Transmission abnormality logging section 212... Storage section 213, 214... Communication module 2141...First socket 2142...Second socket 2143...Third socket 2144...Fourth socket 2145...Fifth socket 2146...Sixth socket 2147...Seventh socket 2148...Eighth socket 22...Master station router 23-1 to 23 -n...Slave station router 24, 24-1 to 24-n...Slave station control device 241...Processing circuit 2411...Control section 2412...Communication control section 2413...Transmission abnormality logging section 242...Storage section 243...Communication module 2431...th 1 socket 2432...Second socket 30-1 to 30-n...Controlled object 31-1 to 31-n...Equipment equipment

Claims (1)

a first telemeter comprising a communication module configurable with a plurality of sockets;
comprising a plurality of second telemeters that transmit and receive digital signals to and from the first telemeter,
At least two or more second telemeters among the plurality of second telemeters transmit a signal to one socket that is a preset destination among the plurality of sockets of the communication module,
The first telemeter transmits a signal from each of the plurality of sockets other than the socket to any one of the plurality of second telemeters,
The first telemeter stores data about the equipment included in the signal received by the socket in the second telemeter that transmitted the signal received by the socket, out of the storage areas allocated to each of the plurality of second telemeters. Store in the storage area allocated to the telemeter
telemeter system.