JP2016201027A - Remote control monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio remote control monitoring system that can sufficiently communicate even if a site where a PLC for controlling an apparatus is installed is distant from a remote place where remote control is performed and is not influenced by a communication situation.SOLUTION: A remote control monitoring system comprises: a PLC 1 that controls an apparatus and is installed at a site A for collecting operation situation data on the apparatus; and a remote control terminal 9 that is placed at a remote place B for remotely operating the PLC 1 by radio via a communication line 8. A site operation terminal 7 placed at the site A communicates with the PLC 1 and enables operation monitoring of data on the PLC 1, and the remote control terminal 9 connects with the site operation terminal 7 via the communication line 8 and enables operation monitoring of data on the PLC 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system for remotely monitoring and monitoring PLC (programmable control device, sequencer) data for controlling equipment installed at a site and collecting operation status data of the equipment. It is.

  Conventionally, PLC state data for controlling equipment installed on site is controlled by an operation terminal (personal computer) using SCADA (supervisory control and data acquisition) program. In addition, a system that performs operation monitoring such as collecting operation status data and outputting it as operation data is known.

  Then, as shown in FIG. 2, the operation monitoring system initially collects the operation status and management data and outputs it as operation data in order to control the PLC 1 that controls the device (not shown) at the site A. The operation terminal (personal computer) 2 is connected to the serial communication cable 4 via, for example, the hub 3 to edit the program of the PLC 1 and collect the operation status data of the device.

  However, in order to install an operation monitoring system consisting of the PLC 1 and the operation terminal (personal computer) 2 connected by the serial communication cable 4 at the site A, the communication distance is limited, especially when it is desired to operate from a remote location. However, there is a problem that it is necessary to install the cable 4 over a long distance, and that the connection of the cable 4 makes communication difficult due to signal attenuation at a long distance.

  In order to solve these problems, instead of using the serial communication cable 4, the connection is made through a public line such as a telephone line and a modem that mutually converts serial communication signals and public line communication signals. Such an operation monitoring system is disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-222133 (Patent Document 1), but there is a problem in that maintenance of public lines and communication costs increase and communication speed is slow.

  Further, as shown in FIG. 3, a router 5 having a PLC 1 and a data communication card 6 attached thereto and connected to the PLC 1 is installed at a site A, and this is also used as an operation terminal (to which the data communication card 6 is connected). There has also been proposed a remote operation monitoring system in which a personal computer 2 is installed in a remote location B and both are connected by a communication line 8 such as a wireless LAN using the data communication card 6 (Japanese Patent Laid-Open No. 2001-125645). (Patent Document 2)).

  Here, the wireless remote operation monitoring system as presented in the above publication exchanges various data via a communication line 8 such as a wireless LAN, and does not require a dedicated line and is like a public line. It has the advantage that it is suitable for inexpensive remote control because it does not require troublesome wiring.

  However, the conventional wireless remote operation monitoring system has a problem that the communication distance is not sufficient and the remote distance is limited, and the communication condition is affected, for example, communication is interrupted.

JP 2005-222133 A JP 2001-125645 A

  The present invention has been made to solve the problems of the conventional wireless remote operation monitoring system, and it is sufficient even if the site where the PLC for controlling the device is installed and the remote place where the remote operation is performed are separated from each other. It is an object of the present invention to provide a wireless remote control monitoring system that can communicate with each other and is not affected by the communication status.

  The present invention, which has been made to solve the above-mentioned problems, remotely controls the PLC wirelessly through a communication line, and a PLC installed on the site for controlling the device and collecting the operation status data of the device. In a remote operation monitoring system provided with a remote operation terminal arranged at a remote place for operation, the PLC operation is monitored by communicating with the PLC by the on-site operation terminal arranged at the site. The remote operation terminal is connected to the on-site operation terminal via the communication line to enable operation monitoring of the PLC data.

  According to the present invention, the PLC data is operated and monitored through the on-site operation terminal by once connecting to the on-site operation terminal without directly communicating with the PLC from the remote operation terminal as in the prior art. Even if communication from the remote operation terminal is interrupted, there is no effect on the processing at the site. In addition, it can be used continuously for 24 hours at the site using a terminal for site operation installed at the site.

  In the present invention, when the communication line connecting the remote operation terminal and the on-site operation terminal is the Internet, it can be installed anywhere in the country as long as it is in the Internet area. There is no need for a dedicated device or application as in the case of using a communication line, which is advantageous in terms of economy.

  Further, when the on-site operation terminal is an environment-resistant BOX personal computer, it can be used even in a poor on-site environment. In particular, in the case of a compact BOX personal computer, no installation space is required, so even in a small environment. It is possible to install.

  In addition, when the communication line is a VPN (Virtual Private Network), a higher security can be provided.

  According to the present invention, wireless remote control is possible even if the site where the PLC for controlling the device is installed and the remote site where the remote control is performed are sufficiently remote and not affected by the communication status. A monitoring system can be provided.

Schematic showing a preferred embodiment of the present invention Explanatory drawing which shows a prior art example. Explanatory drawing which shows a different prior art example.

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

  FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention. In the field A, a PLC 1 for controlling equipment (not shown) and collecting operational status data of the equipment, An on-site operation terminal 7 such as an environmentally resistant BOX compact personal computer (industrial personal computer) is connected to the PLC 1's Ethernet (registered trademark) interface via a router 5, and data is exchanged via Ethernet (registered trademark) communication. It can be carried out.

  In addition, a data communication card 6 for connecting to a communication line 8 that is the Internet is connected to the router 5 arranged at the site A.

  On the other hand, in a remote location B far from the site A, for example, SCADA (supervisory control and data acquisition) which is a program for monitoring the operation of the PLC 1 for controlling equipment installed in the site A ) A remote operation terminal 9 comprising a personal computer that can use the program is installed. The remote operation terminal 9 is connected to a data communication card 6 for connecting to a communication line 8 which is the Internet.

  In the present embodiment having the above configuration, the data (data) of the PLC 1 can be monitored at the site A via the router 5 by the site operation terminal 7. In addition, in order to monitor the data (data) of the PLC 1 by the remote operation terminal 9, it is installed at the site A from the remote operation terminal 9 via the communication line 8 without directly monitoring the PLC 1 data (data). It is possible to browse and monitor the data (data) of the PLC 1 that is connected to the field operation terminal 7 and collected at the field operation terminal 7. In this embodiment, the ladder circuit of the PLC 1 installed at the site A can be changed from the remote operation terminal 9, but the ladder circuit of the PLC 1 can also be changed from the site operation terminal 7 installed at the site A. It is possible to make changes on site A very accurately.

  As described above, the present embodiment always controls and monitors the PLC 1 at the on-site operation terminal 7, and even if communication from the remote operation terminal 9 is interrupted, the processing at the on-site A is not affected. . Further, it can be used continuously at the site A for 24 hours by the site operation terminal 7 installed at the site A.

  In the present embodiment, since the communication line 8 connecting the remote operation terminal 9 and the on-site operation terminal 7 is the Internet, it can be monitored by high-speed communication anywhere in the country as long as it is within the Internet area. There is no need for a dedicated device or application as in the case of using a special communication line, which is advantageous in terms of economy.

  Furthermore, in the present embodiment, the on-site operation terminal 7 is an environment-resistant BOX personal computer, so that it can cope with an inferior on-site environment. It can also be installed at an environmental site.

  If the communication line is a VPN (Virtual Private Network), it is possible to provide a higher security one.

  1 PLC, 2 operation terminal, 3 hub, 4 serial communication cable, 5 router, 6 communication card, 7 field operation terminal, 8 communication line, 9 remote operation terminal, A field, B remote area

Claims (5)

  Remote location control for controlling a device and for installing a PLC for collecting the operation status data of the device and a remote location for remotely operating the PLC wirelessly via a communication line In the remote operation monitoring system comprising a terminal for operation, the field operation terminal arranged at the field communicates with the PLC to enable operation monitoring of data in the PLC, and from the remote operation terminal A remote operation monitoring system characterized in that operation monitoring of the PLC data is enabled by connecting to the field operation terminal via a communication line.   2. The remote operation monitoring system according to claim 1, wherein a communication line connecting the remote operation terminal and the on-site operation terminal is the Internet.   The remote control program according to claim 1 or 2, wherein the PLC operation monitoring program for controlling the equipment installed on the site is a SCADA (supervisory control and data acquisition) program. Operation monitoring system.   4. The remote operation monitoring system according to claim 1, wherein the on-site operation terminal is an environment-resistant BOX personal computer.   5. The remote operation monitoring system according to claim 1, wherein the communication line is a VPN (Virtual Private Network).

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