JP2001014023A - Monitor control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an unauthorized access to a system when a portable personal computer is connected with a central processing unit by using a public line capable of being connected by anyone. SOLUTION: In this monitor control system, when a portable personal computer 2 is operated and a connection request is issued, the connection request is checked whether it is the one performed via a PHS telephone set 4 with a telephone number in which the connection request is preliminarily registered, with normal log-in ID and a normal password or not by a central processing unit 5, when the connection request is the normal one, remote access by the portable personal computer 2 is permitted, requested display information, etc., are displayed on the portable personal computer 2 and a plant is controlled based on an control instruction request to be outputted from the portable personal computer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring and control system for monitoring and controlling facilities such as water and sewage treatment plants, building factory facilities, and production plants.

[0002]

2. Description of the Related Art Conventionally, a monitoring and control system for monitoring and controlling facilities such as a water and sewage treatment plant, a building factory facility, and a production plant by using a portable terminal device combining a personal computer device and a mobile phone such as a PHS phone has been developed. Are known.

This monitoring and control system takes in a state detection signal output from a plant by a central processing unit, and displays an operation state of the plant on a monitoring screen,
Based on instructions from the operator in the central monitoring room, various control signals are generated to control the plant to be monitored and controlled. When an operator outside the central monitoring room operates a portable personal computer with a PHS telephone and issues a connection request, it is supplied to the central processing unit via a public line. Login authentication is performed, and it is checked whether the request is a legitimate connection request. If the request is a legitimate connection request using a legitimate login ID and a legitimate password, the connection is permitted. Thereafter, the portable personal computer device is operated to input a display instruction request, and this is supplied to the central processing unit via a public line, and the central processing unit requests the stored information from among the stored information. The information is read out, sent out on the public line, and displayed on the portable personal computer, and the portable personal computer is operated to input a control instruction request, which is transmitted via the public line to the central processing unit. , The central processing unit generates various control signals corresponding to the control instruction, and controls a plant to be monitored and controlled.

[0004]

In such a conventional monitoring and control system, a portable personal computer and a central processing unit are connected via a public line. A connection request can be issued to the central processing unit via the CPU, and when a person other than the operator who has received the special connection permission issues a connection request to the central processing unit, the central processing unit detects this and designates the connection request. There is a risk of starting processing.

For this reason, in such a monitoring and control system, a display instruction request and a control instruction request are supplied from a portable personal computer via a public line, and when these are input to the central processing unit, the central processing unit transmits the request. It checks whether the portable personal computer that issued the connection request after performing login authentication is a portable personal computer that is permitted to connect, and the display instruction request and the control instruction request are from the portable personal computer that is permitted to connect. At this time, the display instruction request and the control instruction request are accepted so that the system does not malfunction due to a wrong telephone call or the like.

However, in recent years, hackers and the like often enter the network and steal passwords, and it is difficult to secure the security of the system only with the above-described login authentication. However, there has been a strong demand for the development of a system that can prevent unauthorized entry.

SUMMARY OF THE INVENTION In view of the above circumstances, according to the first aspect of the present invention, access control is strictly controlled, system security can be dramatically improved, system information can be prevented from leaking, and external information can be prevented. It is an object of the present invention to provide a monitoring and control system that can prevent unauthorized operations and dramatically increase the safety of the system.

[0008]

To achieve the above object, according to the present invention, a central processing unit for monitoring and controlling a plant is connected to the central processing unit via a portable telephone line. A portable terminal device for performing a process of downloading monitoring control information on the central processing unit side, wherein the portable terminal device is disposed in the central processing unit, and a line is transmitted from the portable terminal device via the portable telephone line. A connection request permission / inhibition determining means for permitting a line connection only when a transmitter number supplied from the portable terminal device is a pre-registered transmitter number when a connection request is made; And

According to a second aspect of the present invention, a central processing unit for monitoring and controlling a plant is connected to the central processing unit via a portable telephone line, and a portable type for performing a process of downloading monitoring control information on the central processing unit side. In a control system having a terminal device, the control device is disposed in the central processing unit,
A radio base station ID in which a radio base station ID supplied from the mobile phone line is registered in advance when there is a line connection request from the portable terminal device via the mobile phone line
And a connection request permission / non-permission determining means for permitting the line connection only when.

According to a third aspect of the present invention, a central processing unit for monitoring and controlling the plant is connected to the central processing unit via a portable telephone line, and the portable processing unit downloads the monitoring control information on the central processing unit side. In a control system having a terminal device, the control device is disposed in the central processing unit,
When there is a line connection request from the portable terminal device via the portable telephone line, an area where the portable terminal device is located is determined based on a wireless base station ID supplied from the portable telephone line. It is characterized by comprising an area determining means and a monitoring information supply means for supplying monitoring information corresponding to the area to the portable terminal device based on the determination result.

According to the first aspect of the present invention, when a line connection request is received from a portable terminal device via a mobile telephone line, the connection request availability determining unit disposed in the central processing unit determines whether or not the portable terminal device has a connection request. When the transmitter number supplied from the terminal device is a pre-registered transmitter number, the line connection is permitted, and otherwise, the line connection is cut off so that anyone can connect. , Even when the portable terminal device is connected to the central processing unit, the connection permission is issued only when accessing using a specific mobile phone. Strictly control access, dramatically increase system security, prevent system information from being leaked, and prevent unauthorized operations from outside. To dramatically enhance the safety of the system.

According to the second aspect, via a PHS telephone line,
When a line connection request is received from the portable terminal device, the connection request availability determination unit disposed in the central processing unit determines whether or not P
When the wireless base station ID supplied from the HS telephone line is a pre-registered wireless base station ID, the line connection is permitted, and otherwise, anyone can connect by disconnecting the line connection. Even when the portable terminal device and the central processing unit are connected using a public line that can be used, connection permission is issued only when accessing from within a preset area, and other Occasionally, the connection is refused, thereby strictly controlling access, dramatically increasing the security of the system, preventing the leakage of system information, and preventing unauthorized operations from the outside. Dramatically enhance the sex.

[0013] According to claim 3, via a PHS telephone line,
When there is a line connection request from the portable terminal device, the PHS
Based on the wireless base station ID supplied from the telephone line, the monitoring information supply unit disposed in the central processing unit determines an area where the portable terminal device is located, and, based on the determination result, corresponds to the area. By supplying the monitoring information to the portable terminal device, when the portable terminal device is connected to the central processing unit using a public line, only the devices in the area where the connection request was issued are provided. This allows the portable terminal device to be used as an on-site monitoring and control device, thereby facilitating the monitoring and control of each part of the plant even if the plant to be monitored and controlled is huge.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS << First Embodiment >> FIG. 1 is a block diagram showing the overall configuration of a supervisory control system according to the present invention, and FIG. 2 corresponds to claim 1 of the supervisory control system according to the present invention. It is a block diagram showing an embodiment.

As shown in FIG. 1, the monitoring control system 1
Carried by operators, etc., outside the central monitoring room,
A portable personal computer 2 used for monitoring and controlling a plant, a PHS telephone 4 attached to the portable personal computer 2 and connecting the portable personal computer 2 to the public line 3, It is arranged in a room or the like and receives a state detection signal output from a plant to be monitored and controlled, and displays the operation state of the plant on a monitoring screen while operating contents of an operator in the central monitoring room or via a public line 3. A central processing unit 5 for monitoring and controlling the plant to be monitored and controlled in accordance with the operation content supplied from the portable personal computer device 2.

In the monitoring and control system 1, the central processing unit 5 captures a state detection signal output from the plant, and displays an operation state of the plant on a monitoring screen while giving instructions from an operator in the central monitoring room. , Various control signals are generated to control the plant to be monitored and controlled. When an operator outside the central monitoring room issues a connection request from the portable personal computer 2 and supplies it to the central processing unit 5 via the public line 3, the central processing unit 5 sends the connection request. Checks whether the connection request is made via the PHS telephone 4 having a telephone number registered in advance and with a regular login ID and a regular password, and checks whether the connection request is a telephone number registered in advance. When the connection request is made via the PHS telephone 4 and with the regular login ID and the regular password, the remote access by the portable personal computer device 2 is permitted, and the requested display information and the like are transmitted to the portable personal computer. The plan to be monitored and controlled based on a control instruction request output from the portable personal computer device 2 while being displayed on the device 2 To control.

The portable personal computer 2 has a connection screen necessary for logging in to the central processing unit 5 via the public line 3 and various buttons necessary for operating a plant to be monitored and controlled. A display processing unit 6 for displaying an operation screen, a monitoring screen for notifying the operation state of the plant and the like on a display unit, and a central processing unit 5 via a public line 3
And a remote access processing unit 7 for managing a login ID, a password, and the like necessary to log in to the server. When a connection request is issued from the remote access processing unit 7,
A process for controlling the S telephone 4 to establish a wireless line with the public line 3 and calling the central processing unit 5, a process for establishing a communication line with the central processing unit 5 using a login ID, a password, etc., input by an operator A communication processing unit 8 that performs a process of supplying the received display instruction request, control instruction request, and the like to the central processing unit 5, a process of taking in display information and the like output from the central processing unit 5 and passing it to the display processing unit 6; It has.

In this portable personal computer device 2,
When a connection request is input from a keyboard or the like by an operator, the central processing unit 5 is called via the PHS telephone 4, and a communication line with the central processing unit 5 is established using a login ID, a password, and the like. Then
When a display instruction request, a control instruction request, or the like is input from the keyboard by the operator, the portable personal computer device 2 →
The PHS telephone 4 → public line 3 → central processing unit 5 sends a display instruction request, a control instruction request, etc. to the central processing unit 5.
The central processing unit 5 also outputs display information and the like indicating the operating state of the plant, etc., which is routed through the central processing unit 5 → public line 3 → PHS telephone 4 → portable personal computer device 2 to the portable type. When it is supplied to the personal computer 2, it is taken in and the operating status of the plant is displayed on the monitoring screen.

The PHS telephone 4 is a portable personal computer 2
A communication processing unit 9 for performing processing of transmitting and receiving signals to and from the public line 3 using wireless signals;
When a connection request is output from the portable personal computer 2 while being connected to the portable personal computer 2, the portable telephone 2 goes off-hook and transmits its own telephone number to the public line 3. After establishing a wireless line with the public line 3 and transmitting a telephone number of a communication destination output together with the connection request to the public line 3 to establish a communication line with the central processing unit 5, an output from the portable personal computer 2 is made. The login ID and the password are transmitted to the public line 3 and the central processing unit 5 receives the login permission. When a display instruction request, a control instruction request, or the like is output from the portable personal computer device 2, the display instruction request, the control instruction request, or the like is transmitted via the PHS telephone 4 → the public line 3 → the central processing unit 5. And display information and the like are output from the central processing unit 5 to the central processing unit 5 → public line 3 → P
When display information or the like is supplied through the route of the HS telephone 4, it is supplied to the portable personal computer 2.

The public line 3 includes a receiving antenna 10 for transmitting and receiving a radio signal to and from the PHS telephone 4, and a PHS which has issued a calling signal among the PHS telephones 4 using the radio signal.
It has a communication processing unit 11 for communicating with the telephone 4 or the PHS telephone 4 as a call destination, and selects the PHS telephone 4 to be a communication destination or a communication source from among the PHS telephones 4 via the reception antenna 10. The PHS exchange 1 confirms a telephone number of a communication destination and a communication source with the PHS telephone 4, establishes a wireless line, and performs information transmission / reception processing.
2, a transmission / reception processing unit 13 for inputting / outputting information to / from the PHS exchange 12, a transmission / reception processing unit 14 for inputting / outputting information to / from the central processing unit 5 via a wired line, 14 has a data conversion processing unit 15 for mutually exchanging the standard of information input and output between the PHS exchanges 14. When a call signal is output from the PHS exchange 12, a wired line is selected based on the telephone number of the communication destination. , A central processing unit 5 and the like, and a communication line is established. After that, the central processing unit 5 or the PHS telephone 4 is provided with a wireless monitoring processing unit 16 which maintains the communication line until the on-hook processing is performed.

When a radio signal including a call signal, a telephone number of the PHS telephone 4, a telephone number of a communication destination, and the like is transmitted from the PHS telephone 4, it is received and included in the radio signal. Call signal, PHS
After demodulating the telephone number of the telephone 4, the telephone number of the communication destination, and the like, a wire line is selected based on the telephone number of the communication destination, and the central processing unit 5 is called. After supplying information such as the telephone number of the wireless base station 4 and the number of the wireless base station that has received the wireless signal (wireless base station ID), and establishing a communication line, the PHS telephone 4 sends a login ID, a password, a display instruction request, When a wireless signal including a control instruction request is transmitted, the wireless signal is received, and the login ID, the password, the display instruction request, the control instruction request, and the like included in the wireless signal are demodulated, and the communication for the wired line is performed. The information is converted into standardized information and supplied to the central processing unit 5, and when display information or the like is output from the central processing unit 5, the display information or the like is fetched and used for the wireless line. Converts the information signal standard, it modulates the information, and generates a radio signal, and transmits it to the PHS telephone set 4. Thereafter, the central processing unit 5
Alternatively, when any one of the PHS telephones 4 performs the on-hook processing, the communication line between the central processing unit 5 and the PHS telephone 4 is cut off.

The central processing unit 5 is disposed in a central monitoring room or the like, and performs a process of interfacing various information, a process of storing various information, and the like.
An operation screen on which various buttons and the like necessary for operating the plant to be monitored and controlled, an operator station device 23 for displaying a monitoring screen indicating the operation state of the plant, and the like; and a plant to be monitored and controlled. To generate display information indicating the operation state of the plant, supply the display information to the operator station device 23 and the server station device 22, and
3. A process control device 24 that generates a control signal when a control instruction request is issued from the server station device 22, supplies the control signal to the plant, and controls the operation state of the plant.

In particular, as shown in FIG. 2, the server station device 22a according to the first embodiment includes a communication processing unit 17, a sender information file unit 18, a transmitter determination processing unit 19, a remote access processing unit The section 20 and the display data processing section 21 perform various information interface processing, various information storage processing, and the like.

The central processing unit 5 captures a state detection signal output from the plant, displays the operating state of the plant on a monitoring screen, and performs various operations based on instructions from an operator in the central monitoring room. A control signal is generated, and the plant to be monitored and controlled is controlled. Also, by an operator outside the central monitoring room,
When the portable personal computer device 2 is operated and a connection request is issued and supplied to the central processing unit 5 via the public line 3, the transmitter information (PHS) supplied from the public line 3 is supplied together with the connection request. Checking of the telephone number of the telephone 4) and login authentication are performed, and the connection request is made via the PHS telephone 4 having the telephone number registered in advance, and the connection is made with the regular login ID and the regular password. Check whether the request is a request, and if the connection request is made via the PHS telephone 4 having a telephone number registered in advance and the connection request is made with a regular login ID and a regular password, the connection is permitted. I do. Thereafter, the portable personal computer device 2 is operated to input a display instruction request,
When this is supplied to the central processing unit 5 via the public line 3, the central processing unit 5 reads out the requested information from the stored information and sends it out to the public line 3. Is displayed on the portable personal computer 2, and when the portable personal computer 2 is operated and a control instruction request is input and supplied to the central processing unit 5 through the public line 3, the central processing unit By device 5
It generates various control signals corresponding to the control instruction request, and controls a plant to be monitored and controlled.

At this time, when the communication processing unit 17 of the server station device 22a shown in FIG. 2 receives the call signal from the wireless monitoring processing device 16, the communication processing unit 17 goes off-hook and establishes a communication line with the wireless monitoring processing device 16. At the same time, the information output from the wireless monitoring processing device 16 is fetched and passed to the remote access processing unit 20, and the information output from the remote access processing unit 20 is fetched and transmitted to the wireless monitoring processing unit 20. When the line interruption instruction is output from the portable personal computer 2 and is supplied via the wireless monitoring processing device 16 or when the line interruption instruction is output from the remote access processing unit 20, the communication is performed. Cut off the line.

The caller information file section 18 has registered therein caller information such as a login ID and a password assigned to an authorized operator, and a telephone number of the PHS telephone 4 held by the authorized operator. When a read command is output from the determination processing unit 19, the caller information specified by the read command is read and supplied to the transmitter determination processing unit 19.

When the telephone number, login ID, and password of the communication source are input from the remote access processing unit 20, the transmitter determination processing unit 19
Refers to each telephone number, each login ID, and each password registered in, and determines whether the input telephone number, login ID, and password of the communication source are those provided to an authorized operator, and inputs When the telephone number, login ID, and password of the communication source provided to the authorized operator, a connection permission is generated and supplied to the remote access processing unit 20. When the number, the login ID, and the password are not provided to the authorized operator, a disconnection instruction is generated and supplied to the remote access processing unit 20.

When the communication processing unit 17 goes off-hook, the remote access processing unit 20 fetches the telephone number, login ID, and password of the communication source output from the public line 3 via the communication processing unit 17. Then, after passing this to the transmitter determination processing unit 19, when a disconnection instruction is output from the transmitter determination processing unit 19, the communication processing unit 17 is set to an on-hook state to terminate the communication. When the connection permission is output from the determination processing unit 19, communication with the remote access processing unit 7 via the communication processing unit 17, the public line 3, and the PHS telephone 4 is started.

When a display instruction request is output from the portable personal computer 2, the request is fetched and passed to the display data processing unit 21. When display information or the like is output from the display data processing unit 21, Is supplied to the portable personal computer 2, and when a control instruction request is output from the portable personal computer 2, a control signal corresponding to the control instruction request is generated and transmitted to the process control device 24. Then, when a connection disconnection request is output from the portable personal computer device 2, the communication processing unit 17 is set to an on-hook state to terminate the communication.

When a display instruction request is output from the remote access processing unit 20, the display data processing unit 21 accesses a database unit (not shown) based on the display instruction request and receives the request. The display information is read out, output to the remote access processing unit 20, and supplied to the portable personal computer 2.

As described above, in this embodiment, the operator outside the central monitoring room operates the portable personal computer 2 to issue a connection request, which is transmitted via the public line 3 to the central processing unit 5. The connection request is sent by the central processing unit 5 via the PHS telephone 4 having a telephone number registered in advance, and with a regular login ID and a regular password. If the connection request is made via the PHS telephone 4 of the telephone number registered in advance and the connection request is made with the regular login ID and the regular password, the remote access by the portable personal computer device 2 is performed. And the requested display information is displayed on the portable personal computer 2 and output from the portable personal computer 2. Based on your instruction request, since to control the plant that is the supervisory control object,
Using the public line 3 that anyone can connect,
Even when the portable personal computer device 2 and the central processing unit 5 are connected, the connection permission is issued only when the access is performed using the specific PHS telephone 4, and the connection is refused otherwise. This makes it possible to tighten access control, dramatically increase system security, prevent system information from being leaked, and prevent unauthorized operations from the outside.
The safety of the system can be dramatically improved.

<< Second Embodiment >> FIG. 3 is a block diagram showing a second embodiment of the monitoring control system according to the present invention. In this figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

The monitoring control system 1b shown in FIG.
3 is different from the monitoring control system 1a shown in FIG. 3 in that, instead of the server station device 22a, a position information file unit 26 and a transmission position confirmation processing unit 27 are added as shown in FIG. A server station device 22b having a modified processing procedure is provided, and when a call signal is supplied from the public line 3, checking of the transmitter information (the telephone number of the PHS telephone 4) supplied from the public line 3 and checking of the PHS telephone The base station ID (wireless base station ID) of the PHS wireless base station that has received the call signal from the base station 4 and the login authentication are performed, and the PHS telephone 4 that has issued the connection request is registered in each area. Is checked, and a PHS telephone 4 having a telephone number whose connection request is registered in advance is checked. Via to, and regular login ID,
It is checked whether or not the connection request has been made with a regular password, and the PHS telephone 4 that issued the connection request exists in any of the areas registered in advance, and the connection request is registered in advance. The connection is permitted when the connection request is made via the PHS telephone 4 having the telephone number and with the regular login ID and the regular password.

In this case, the server station device 22b
The location information file unit 26 is provided with a radio device of each PHS radio base station that has a transmission / reception area for each area to which remote control from the portable personal computer device 2 is permitted, for example, an incineration plant, a pumping station, or another area related to the plant. When the base station ID is registered and a read command is output from the transmission position confirmation processing unit 27, the wireless base station ID specified by the read command is read and supplied to the transmission position confirmation processing unit 27.

The originating position confirmation processing unit 27 receives the radio base station ID of the PHS radio base station from the remote access processing unit 20.
Is supplied, the wireless base station ID supplied from the remote access processing unit 20 is referred to each wireless base station ID registered in the position information file unit 26, and the wireless base station ID of the wireless base station ID registered in advance is registered. It is checked whether it matches any of them. When the wireless base station ID supplied from the remote access processing unit 20 matches any of the wireless base station IDs registered in advance, the PHS telephone 4
Is determined to be present in any of the areas related to the plant, a connection permission is generated, and the connection permission is supplied to the remote access processing unit 20.
If the wireless base station ID supplied from 0 does not match any of the wireless base station IDs registered in advance, PH
It is determined that the S telephone 4 is not present in any of the areas related to the plant, and a disconnection instruction is generated,
This is supplied to the remote access processing unit 20.

When the communication processing unit 17 goes off-hook, the remote access processing unit 20 fetches the telephone number, login ID, and password of the communication source output from the public line 3 via the communication processing unit 17. Then, this is passed to the transmitter determination processing unit 19, and the radio base station ID output from the public line 3 is taken in. After passing this to the transmission position confirmation processing unit 27, the transmission position confirmation processing unit 27 or When a disconnection request is output from any of the transmitter determination processing units 19, the communication processing unit 17 is set to an on-hook state to terminate communication, and the transmission position confirmation processing unit 27, the transmitter determination processing unit 19 When the connection permission is output from, the communication with the remote access processing unit 7 via the communication processing unit 17, the public line 3, and the PHS telephone 4 is started.

When a display instruction request is output from the portable personal computer 2, the request is taken and passed to the display data processing unit 21. When display information and the like are output from the display data processing unit 21, Is supplied to the portable personal computer 2, and when a control instruction request is output from the portable personal computer 2, a control signal corresponding to the control instruction request is generated and transmitted to the process control device 24. Then, when a connection disconnection request is output from the portable personal computer device 2, the communication processing unit 17 is turned on and the communication is terminated.

As described above, in this embodiment, when a call signal is supplied from the public line 3, the transmitter information (the telephone number of the PHS telephone 4) supplied from the public line 3 is checked and the PHS telephone The base station ID (wireless base station ID) of the PHS wireless base station that has received the call signal from the base station 4 and the login authentication are performed, and the PHS telephone 4 that has issued the connection request is registered in each area. Check if it exists in any of the
Further, a P having a telephone number whose connection request is registered in advance
It is checked whether or not the connection request has been made via the HS telephone 4 and with the regular login ID and the regular password, and any of the PHS telephones 4 that issued the connection request in each area registered in advance. And a PHS telephone 4 having a telephone number for which a connection request is registered in advance.
When a connection request is made with a regular login ID and a regular password via the Internet, the connection is permitted, so that anybody can use the public line 3 to connect, Even when the personal computer 2 and the central processing unit 5 are connected, it is possible to issue a connection permission only when accessing from within a preset area, and to refuse the connection otherwise. Can,
This makes access control even more rigorous, dramatically increasing system security and preventing system information from being leaked, and preventing unauthorized operations from the outside to increase system security. Can be increased.

<< Third Embodiment >> FIG. 4 is a block diagram showing a third embodiment of the monitoring control system according to the present invention. In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals.

The monitoring control system 1c shown in FIG.
4 is different from the monitoring control system 1b shown in FIG. 4 in that a display information file section 29 and a display data processing section 30 are added as shown in FIG. 27, a server station device 22c in which the processing procedure of the display data processing unit 21 and the remote access processing unit 20 is changed, and when a calling signal is supplied from the public line 3, the PHS radio base supplied from the public line 3. Station radio base station ID
Based on this, the area in which the portable personal computer device 2 is located is determined, and based on this determination result, display information necessary for performing monitoring control of the plant equipment provided in this area is selected, and this is displayed on the portable computer. This is to display on the personal computer device 2.

In this case, the display information file unit 29 stores a screen number (a screen number necessary for monitoring and controlling each plant device provided in each area) corresponding to each area registered in the position information file unit 26. When the read command is output from the transmission position confirmation processing unit 27, the screen number specified by the read command is selected and supplied to the transmission position confirmation processing unit 27.

The transmission position confirmation processing unit 27 receives the radio base station ID of the PHS radio base station from the remote access processing unit 20.
Is supplied, the wireless base station ID supplied from the remote access processing unit 20 is referred to each wireless base station ID registered in the position information file unit 26, and the wireless base station ID of the wireless base station ID registered in advance is registered. It is checked whether it matches any of them. When the wireless base station ID supplied from the remote access processing unit 20 matches any of the wireless base station IDs registered in advance, the PHS telephone 4
Is determined to be present in any of the areas related to the plant, a connection permission is generated, and this is supplied to the remote access processing unit 20, and based on the number of the matching area (area number), Display information file part 2
9 is accessed, the screen number corresponding to the area number is read, and the screen number and the area number are supplied to the display data processing unit 21. Also, the remote access processing unit 2
If the wireless base station ID supplied from 0 does not match any of the wireless base station IDs registered in advance, PH
It is determined that the S telephone 4 is not present in any of the areas related to the plant, and a disconnection instruction is generated,
This is supplied to the remote access processing unit 20.

When the communication processing unit 17 goes off-hook, the remote access processing unit 20 fetches the telephone number, login ID, and password of the communication source output from the public line 3 via the communication processing unit 17. Then, this is passed to the transmitter determination processing unit 19, and the radio base station ID output from the public line 3 is taken in. After passing this to the transmission position confirmation processing unit 27, the transmission position confirmation processing unit 27 or When a disconnection request is output from any of the transmitter determination processing units 19, the communication processing unit 17 is set to an on-hook state to terminate communication, and the transmission position confirmation processing unit 27, the transmitter determination processing unit 19 When the connection permission is output from, the communication with the remote access processing unit 7 via the communication processing unit 17, the public line 3, and the PHS telephone 4 is started.

When a display instruction request is output from the portable personal computer device 2, it is fetched and passed to the display data processing unit 21. When display information and the like are output from the display data processing unit 21, Is supplied to the portable personal computer 2, and when a control instruction request is output from the portable personal computer 2, a control signal corresponding to the control instruction request is generated and transmitted to the process control device 24. Then, when a connection disconnection request is output from the portable personal computer device 2, the communication processing unit 17 is turned on and the communication is terminated.

Further, when a display instruction request is output from the remote access processing unit 20, the display data processing unit 21 uses the database unit (based on the area number output from the transmission position confirmation processing unit 27 and the screen number). (Illustration is omitted), the display information corresponding to the area where the portable personal computer device 2 is arranged is read out of the display information corresponding to the display instruction request, and supplied to the display data processing unit 30. .

The display data processing unit 30 sorts the display information output from the display data processing unit 21 based on the display instruction request output from the remote access processing unit 20, and converts the display information into the display information corresponding to the display instruction request. After the processing, the display information obtained by this processing is displayed on the display data processing unit 21.
The information is supplied to the portable personal computer 2 via the remote access processing unit 20, the communication processing unit 17, the public line 3, and the PHS telephone 4 sequentially.

Thus, if the portable personal computer 2 is placed in the initial sinking place such as a sewage treatment facility, a screen showing the initial sinking status is displayed on the display of the portable personal computer 2. If the portable personal computer 2 is located near the incinerator, a screen related to incineration is displayed on the display of the portable personal computer 2, and the place where the portable personal computer 2 is placed. Even if is outside the field, if it is placed near the pump, this portable personal computer device 2
On the display of the pump station and its basin, and, if the portable personal computer 2 is placed in a public office, a screen on the portable personal computer 2 that shows the entire public office Is displayed.

As described above, in this embodiment, when a call signal is supplied from the public line 3, the portable personal computer 2 is based on the wireless base station ID of the PHS wireless base station supplied from the public line 3. Is determined, and based on the determination result, display information necessary for monitoring and controlling the plant equipment provided in this area is selected and displayed on the portable personal computer 2. Therefore, when the portable personal computer device 2 is connected to the central processing unit 5 using the public line 3, only the devices in the area where the connection request is issued by the portable personal computer device 2 This allows the portable personal computer device 2 to be used as an on-site monitoring and control device, so that even if the plant or the like to be monitored and controlled is huge, Supervisory control of each unit can be easily performed.

[0049]

As described above, according to the present invention, in the monitoring control system according to the first aspect, a portable terminal device and a central processing unit are connected to each other by using a public line to which anyone can connect. Even when connected, the connection is permitted only when accessing using a specific PHS telephone, and at other times, the connection is refused, so that access control is strictly controlled and the system is controlled. It is possible to dramatically increase security and prevent leakage of system information, and to prevent unauthorized operation from the outside, thereby dramatically improving system security.

In the monitoring and control system according to the second aspect, even when the portable terminal device and the central processing unit are connected using a public line to which anyone can connect, a preset area is set. Only when accessing from inside, grant connection permission, otherwise refuse connection, strictly control access, dramatically improve system security, do not leak system information In addition to this, unauthorized operation from the outside can be prevented, and the security of the system can be dramatically improved.

According to the third aspect of the present invention, when the portable terminal device and the central processing unit are connected to each other using the public line, only the devices in the area where the connection request is issued are monitored. This allows the portable terminal device to be used as an on-site monitoring and control device, thereby facilitating the monitoring and control of each part of the plant even when the plant to be monitored and controlled is huge.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a monitoring control system.

FIG. 2 is a block diagram showing an embodiment corresponding to claim 1 in the monitoring control system according to the present invention.

FIG. 3 is a block diagram showing an embodiment corresponding to claim 2 in the monitoring control system according to the present invention.

FIG. 4 is a block diagram showing an embodiment corresponding to claim 3 in the monitoring control system according to the present invention.

[Explanation of symbols]

1, 1a, 1b, 1c: monitoring control system 2: portable personal computer (portable terminal) 3: public line (PHS telephone line) 4: PHS telephone 5: central processing unit 6: display processing unit 7: remote access Processing unit 8, 9, 11, 17: Communication processing unit 10: Receiving antenna 12: PHS exchange 13, 14: Transmission / reception processing unit 15: Data conversion processing unit 16: Wireless monitoring processing unit 18: Sender information file unit 19: Transmission Device determination processing unit (connection request availability determination unit) 20: remote access processing unit 21: display data processing unit 22, 22a, 22b, 22c: server station device 23: operator station device 24: process control device 26: position information file unit 27: originating position confirmation processing unit (connection request availability determination unit, monitoring information supply unit) 29: display information file File unit 30: Display data processing unit

Claims (3)

[Claims] 1. A central processing unit for monitoring and controlling a plant, and a portable terminal device connected to the central processing unit via a mobile phone line and performing processing for downloading monitoring control information on the central processing unit side. In the control system having: a transmitter number provided in the central processing unit, and when a line connection request is made from the portable terminal device via the mobile phone line, a transmitter number supplied from the portable terminal device is set in advance. A monitoring control system comprising: a connection request availability determination unit for permitting a line connection only when the registered transmitter number is a registered transmitter number. 2. A central processing unit for monitoring and controlling a plant, and a portable terminal device connected to the central processing unit via a mobile phone line and performing processing for downloading monitoring control information on the central processing unit side. In the control system having: a radio base station ID provided in the central processing unit and supplied from the mobile phone line when a line connection request is received from the mobile terminal device via the mobile phone line. A monitoring control system, comprising: a connection request permission / non-permission determining unit that permits a line connection only when the wireless base station ID is registered. 3. A central processing unit for monitoring and controlling a plant, and a portable terminal device connected to the central processing unit via a mobile telephone line and performing processing for downloading monitoring control information on the central processing unit side. In the control system having, based on a wireless base station ID provided from the mobile phone line, when a line connection request is provided from the mobile terminal device via the mobile phone line, the mobile base station device is arranged in the central processing unit. Area determination means for determining an area in which the portable terminal device is placed, and monitoring information supply means for supplying monitoring information corresponding to the area to the portable terminal device based on the determination result. A monitoring control system characterized by the following.