KR100736355B1 - Remote control system using an embeded type remote terminal unit - Google Patents

Abstract

A remote control system using an embedded type remote terminal device is provided to reduce personnel expenses and a failure rate, and improve user convenience in maintenance. A remote terminal device(100) includes a PLC(Programmable Logic Controller) ladder unit for controlling control targets(46-49), an RTU(Remote Terminal Unit) for collecting/controlling data outputted from the control targets(46-49), data communication units for performing bi-directional data communication, memory units for storing information on data transmission, information related to calculation, and a result of the calculation, a kernel controller for transmitting output signals of the PLC ladder unit and the RTU to a controller or a control command of the controller to the PLC ladder unit and the RTU. The PLC ladder unit and the RTU are implemented with an embedded type on a single board. A server device(22) performs data communication with the remote terminal device(100) and inputs a control command for controlling the control targets(46-49). A monitor(24) displays a state of the control targets(46-49).

Description

Remote control system using an embedded remote terminal unit

1 is a schematic configuration diagram of a conventional remote control system using a network,

2 is a schematic configuration diagram of a remote control system using an embedded remote terminal device 100 according to the present invention.

3 is an internal block diagram of the embedded remote terminal device 100 shown in FIG. 2.

<Description of the symbols for the main parts of the drawings>

10: network,

20: central control room,

22: server device,

24: monitor,

30: notebook computer,

32: wireless communication,

34: (wired or wireless) communication,

40, 40a, 40b, 40n: remote place,

42: computer,

44: PLC,

45: RTU,

46: measuring instrument,

47: beacon,

48: pump,

49: blower,

50, 50a, 50b, 50n: remote place,

100: remote terminal device,

110: CPU,

120: SDRAM,

130: flash memory,

140: USB communication unit,

150: data communication unit,

170: data input unit,

180: PLC ladder unit,

190: RTU unit,

200: HMI unit,

210: Web service department.

The present invention relates to a remote control system, and more particularly, to a remote control system using an embedded remote terminal device that performs a complex function.

Generally, a telemetering telecontrol (TM / TC) system is a system for centrally measuring and controlling various equipments located at remote locations. In such a TM / TC system, an essential basic equipment is a remote terminal unit (RTU). Since these RTUs collect and control data at remote sites, they operate mostly unattended and the stability of the device is of paramount importance.

1 is a schematic configuration diagram of a conventional remote control system using a network. As shown in FIG. 1, the central control room 20 is provided with a server device 22 connected to a network 10 such as the Internet, and a plurality of monitors 24 capable of detecting a control situation of each remote site. .

The plurality of remote locations 40 are far apart from each other, and water treatment facilities such as water quality monitoring facilities in rivers, lakes, rivers, and the sea, purification treatment facilities, wastewater treatment facilities, terminal treatment plants, waterworks production facilities, and electric power transmission scada facilities. It can be either.

The remote site 40 is provided with a measuring device 46, a signal signal 47, a pump 48, a motor, a blower 49, and the like, as necessary. The measuring device 46 may be a pressure sensor, a temperature sensor, a water level sensor, a concentration sensor, a current sensor, a voltage sensor, or the like.

In addition, the control targets 46, 47, 48, and 49 are connected to the PLC 44 and the RTU 45, and the PLC 44 and the RTU 45 are connected to a separate computer 42. have. The computer 42 communicates with the network 42, stores various operations and calculation results, outputs control commands, and the like.

However, such a conventional remote control system has the following problems. Each remote location 40 has a PLC 44, an RTU 45, and a separate computer 42, and there is a hassle and inconvenience of connecting them. Therefore, there is an inconsistency that systems at each remote site become complicated, and a large amount of manpower and cost are consumed to install or operate them.

Therefore, the present invention has been made to solve the above problems, the first object of the present invention, PLC ladder unit 180, RTU unit 190, HMI unit 200 and Web service unit 210 To provide a remote control system using an embedded remote terminal device that is designed and implemented on a single board embedded.

A second object of the present invention is to provide a remote control system using an embedded remote terminal device that can be installed and operated with only a single device in an embedded form without installing a separate computer at each remote site.

The object of the present invention as described above, connected to the control target 46, 47, 48, 49, PLC ladder unit for controlling the control target 46, 47, 48, 49 in accordance with a predetermined programmed instruction. 180; An RTU unit 190 connected to a control object 46, 47, 48, 49 to collect and control the output from the control object 46, 47, 48, 49; Data communication units 140 and 150 connected to the network 10 to enable bidirectional data communication; A memory unit (120, 130) and a controller (110) for transmitting data between the data communication unit (140, 150), the PLC ladder unit (180) and the RTU unit (190), and storing the result of the operation; Is connected between the PLC ladder unit 180, the RTU unit 190 and the control unit 110 to transmit the output signal of the PLC ladder unit 180, RTU unit 190 to the control unit 110 or the control unit Kernel control unit 160 for transmitting the control command of the 110 to the PLC ladder unit 180, RTU unit 190; consisting of, the PLC ladder unit 180, RTU unit 190 is a board A remote terminal device 100 implemented as embedded on the system;

A server device 22 connected to a network 10 to enable data communication with the remote terminal device 100 and to input a control command for controlling the control object; And

An embedded remote device, comprising: a monitor 24 connected to a server device 22 to display a state of the control targets 46, 47, 48, and 49 controlled by the remote terminal device 100; It can be achieved by a remote control system using a terminal device.

The remote terminal device 100 further includes an HMI unit 200 for visually displaying signals transmitted between the PLC ladder unit 180, the RTU unit 190, and the control unit 110. The unit 200 is preferably implemented on the board embedded.

In addition, the remote terminal device 100 is connected to the network 10, and the signals transmitted between the PLC ladder unit 180, the RTU unit 190 and the control unit 110 to the World Wide Web (www) Further comprising a web service unit 210 to implement in a form, it may be more suitable that the web service unit 210 is implemented on the board embedded.

In addition, the remote terminal device 100 is most preferably provided with a plurality.

The network 10 is a wireless network, and most preferably further includes a notebook computer 30 connectable to the wireless network.

In addition, the memory units 120 and 130 may include an SDRAM 120 and a flash memory 130, and each of the SDRAM 120 and the flash memory 130 may be connected to the control unit 110 in parallel. Do.

And, the data communication unit 140, 150 is most preferably composed of the USB communication unit 140 and the data communication unit 150 for LAN communication.

In addition, the control target 46, 47, 48, 49 may suitably include at least one of the measuring device 46, the signal signal 47, the pump 48, the blower 49, and the motor.

In addition, the control target may be applied to one of a water quality monitoring facility, a water treatment facility, and a power transmission skada facility.

In addition, the data communication unit 140, 150 is most preferably performed by at least one of the wireless VHF / UHF, dedicated line, CDMA, VSAT, xDSL, telephone line.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments described in conjunction with the accompanying drawings.

The invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments are shown.

2 is a schematic configuration diagram of a remote control system using an embedded remote terminal device 100 according to the present invention. As shown in FIG. 2, the central control room 20 is provided with a server device 22 connected to a network 10 such as the Internet, and a plurality of monitors 24 capable of detecting a control situation of each remote site. .

The plurality of remote locations 50 are far from each other, and water treatment facilities such as water quality monitoring facilities, purification treatment facilities, wastewater treatment facilities, terminal treatment plants, water production facilities, etc. in rivers, lakes, rivers, and the sea, and electric power transmission skadar facilities. It can be either.

The remote location 50 is provided with the measuring device 46, the signal 47, the pump 48, the motor, the blower 49, etc. as needed. The measuring device 46 may be a pressure sensor, a temperature sensor, a water level sensor, a concentration sensor, a current sensor, a voltage sensor, or the like.

In addition, the control targets 46, 47, 48, and 49 are connected to the remote terminal device 100, and the remote terminal device 100 is connected to the network 10 again. Therefore, in FIG. 2, there is the convenience that a separate computer of the remote place 50 is not installed. In addition, the remote terminal device 100 communicates with the network 42, stores various operations and calculation results, and outputs control commands.

The network 10 may be a wired internet or a wireless internet, and in the case of the wireless internet, the network 10 may communicate with a notebook computer (or a PDA or a mobile phone) 30 through a wireless communication 32. Therefore, the administrator can know in real time the situation of each remote location 50 through his or her laptop computer (or PDA, mobile phone) 30 from outside or on-site, and can control in real time.

Wired and wireless communication used in the present invention may be implemented by at least one of wireless VHF / UHF, dedicated line, CDMA, VSAT, xDSL, telephone line, for this purpose, various such as PPP, Telnet, TCP / IP, ICMP, HTTP Use a protocol.

3 is an internal block diagram of the embedded remote terminal device 100 shown in FIG. 2. As shown in FIG. 3, the inside of the remote terminal device 100 is roughly a CPU (or controller) 110, an SDRAM 120, a flash memory 130, a USB communication unit 140, a data communication unit 150, The kernel controller 160, the data input unit 170, the PLC ladder unit 180, the RTU unit 190, the HMI unit 200, the web service unit 210, and the like.

The CPU (or the controller) 110 performs various operations, executes data transmission and control, and determines whether or not the condition is completed. The CPU can employ an embedded microprocessor for 180 MHz 32-bit.

The SDRAM 120 uses 64 MB SDRAM as a memory for storing calculations, calculation results, and the like of the CPU 110. Then, embedded O / S is mounted.

The flash memory 130 uses 16 MB of flash memory to record and read necessary data (for example, automatic backup, recovery function, self-diagnosis, etc. of data in case of communication loss).

The USB communication unit 140 is provided to expose the USB port on the outer surface of the device in order to perform various purposes such as connecting to an external device and data communication.

The data communication unit 150 may be a LAN card or the like for communicating with the network 10. In the case of wireless communication, the data communication unit 150 may be configured as a wireless modem.

The kernel controller 160 is provided between the CPU 110 and the PLC ladder unit 180, the RTU unit 190, the HMI unit 200, and the web service unit 210 to provide the PLC ladder unit 180 and the RTU unit ( 190, the CPU 110 and the signal output from the web service unit 210 convert the input so that the CPU 110 can recognize it. On the contrary, the controller 110 transmits a control signal from the CPU 110 to the PLC ladder unit 180, the RTU unit 190, the HMI unit 200, and the web service unit 210. The kernel control unit 160 may be made of software implemented on the CPU (110).

The data input unit 170 performs a function of receiving various operation options, digital signal input, analog signal input, and the like from the outside. For this purpose, 4 to 32 channel input ports are provided, and in the case of analog signals, analog / digital converters are separately provided. The data input unit 170 may be used to perform a self-diagnosis function.

The programmable logic controller (LADDER) unit 180 is provided in an embedded form on a board provided in the remote terminal device 100. The PLC ladder unit 180 controls the sequential control type using a programmable logic command.

The RTU unit 190 processes the data collected from various control objects and converts the data into a form that can be remotely monitored. The RTU unit 190 is also provided in an embedded form on one board provided in the remote terminal device 100.

The HMI unit 200 displays data converted by the RTU unit 190 on a computer screen or a display device so that an administrator or an operator can visually confirm the data. The HMI unit 200 is also provided in an embedded form on one board provided in the remote terminal device 100.

The web service unit 210 is provided in an embedded form on one board provided in the remote terminal device 100. The web service unit 210 may display data converted by the RTU unit 190, graphic data displayed by the HMI unit 200, and control commands output through the kernel controller 160. ) And converts it into a form (especially HTML form) and implements it on the Internet.

Hereinafter will be described the operation of the embedded remote terminal device performing a complex function having the configuration as described above.

For example, a signal generated from the measuring device 46 of the remote place 50 is transmitted to the PLC unit 180, and collects the RTU unit 190 so as to be remotely controlled (for example, voltage signal adjustment, etc.). To). At this time, the signal generated from the measuring device may be hydrologic data, temperature, pressure, flow rate, valve opening and closing. The converted signal is transmitted to the CPU 110 through the kernel controller 160. In parallel, the HMI unit 200 displays the measured signal on a separate display, and the web service unit 210 displays the measured signal on the web of the Internet. If there is a notebook 30, it can be displayed on its notebook 30 via the wireless network 32.

The CPU 110 transmits the measured signal to the server device 22 through the data communication unit 150 and the network 10. The server device 22 then displays the received measurement signal on the monitor 24 to inform the administrator. Through this process, data is transmitted from each remote 50 to the central control room 20.

Then, when the administrator of the central control room 20 monitors the monitor 24 and inputs or manipulates a predetermined control command, the signal is transmitted to the remote terminal device 100 through the network 10.

Then, in the remote terminal device 100, the signal transmitted through the data communication unit 150, the motor through the CPU 110, kernel control unit 160, RTU unit 190 and PLC ladder unit 180 again And, it is transmitted to the blower 49, the signal 47 and the like to operate. The flow of the control signal may be transmitted with some components omitted depending on the type of the control target or the format of the control command. Therefore, the administrator in the central control room 20 can not only easily control the remote control target, but also can grasp the current state of each control target in real time.

Therefore, according to an embodiment of the present invention as described above, the PLC ladder unit 180, RTU unit 190, HMI unit 200 and Web service unit 210 is designed on the same board embedded type Can be implemented. As a result, it is possible to install and operate only a single device in an embedded form without installing a separate computer at each remote site.

This leads to a reduction in labor costs, a failure rate, and ease of maintenance.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that all modifications fall within the scope of the appended claims.

Claims (4)

A PLC ladder unit (180) connected to a control target (46, 47, 48, 49) and controlling the control target (46, 47, 48, 49) according to a command programmed in a predetermined order; An RTU unit 190 connected to the control targets 46, 47, 48, and 49 for collecting and controlling the outputs from the control targets 46, 47, 48, and 49; Data communication units 140 and 150 connected to the network 10 to enable bidirectional data communication; A memory unit (120, 130) and a controller (110) for transmitting data between the data communication unit (140, 150), the PLC ladder unit (180) and the RTU unit (190), and storing the result of the operation; Is connected between the PLC ladder unit 180, the RTU unit 190 and the control unit 110 to transmit the output signal of the PLC ladder unit 180, RTU unit 190 to the control unit 110 or the control unit Kernel control unit 160 for transmitting the control command of the 110 to the PLC ladder unit 180, RTU unit 190; consisting of, the PLC ladder unit 180, RTU unit 190 is a board A remote terminal device 100 implemented as embedded on the system; A server device 22 connected to the network 10 to enable data communication with the remote terminal device 100 and to input a control command for controlling the control object; And An embedded type, comprising: a monitor (24) connected to the server device (22) to display a state of the control target (46, 47, 48, 49) controlled by the remote terminal device (100); Remote control system using remote terminal device. The method of claim 1, The remote terminal device 100 further includes an HMI unit 200 for visually displaying signals transmitted between the PLC ladder unit 180, the RTU unit 190, and the control unit 110. The HMI unit 200 is a remote control system using an embedded remote terminal device, characterized in that implemented on the board embedded. The method of claim 1, The plurality of remote terminal devices 100 are connected to the network 10 to receive signals transmitted between the PLC ladder unit 180, the RTU unit 190, and the control unit 110. Further comprising a web service unit 210 to implement in the form, The web service unit 210 is a remote control system using an embedded remote terminal device, characterized in that embedded on the board. The method of claim 1, The network 10 is a wireless network, Remote control system using an embedded remote terminal device, characterized in that it further comprises a notebook computer (30) connectable to the wireless network.

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