JP2002091515A - Communication system for control, and recording medium recorded with communication program for control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To browse a user screen to be displayed on a programmable display, etc., even at a place distant from its installing place. SOLUTION: A browser 34 acquires applet specified by an HTML file obtained from an HTML file storage part 31a and makes a virtual machine 33 execute it. The virtual machine 33 acquires an XML file to be required for display of the user screen from an XML file storage part 31b and generates a plotting method as referring to it. The virtual machine 33 inquires a server part 11 about the contents (data) of a device address of a device 8 via communication by both data communication processing parts 32 and 17. The server part 11 reads the data corresponding to applet by receiving an inquiry and transmits it to a client device 3. The display of the user screen displayed on the client device 3 is updated according to the acquired data by the plotting method on the side of the client device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device which can confirm a screen displayed on a control display device by a terminal device arranged at a place distant from the control display device such as a programmable display device. The present invention relates to a communication system.

[0002]

2. Description of the Related Art An industrial control device called a programmable logic controller (hereinafter, referred to as a PLC) or the like is used to implement various controls such as a sequence control, in order to realize various controls such as a belt conveyor type automatic assembling machine. It is widely used as a control device for controlling a target system. Further, in recent years, with the complexity of the target system, a plurality of PLCs have been used in cooperation with each other. The display of data from each PLC and the control instruction to the PLC are performed not only by a control display device arranged near the PLC, but also by a control device installed at a location away from these display devices. In some cases, a control system is constructed so that a host computer can display or operate the computer.

Specifically, for example, as shown in FIG. 14, in a conventional control system, a PLC 101 is positioned as a center of control, and each PLC 101 has an input / output device 102a of a target system 102.
And the status of the device, and the PLC 101
And a programmable display device 103 for giving a control instruction to the computer. Further, the PLC 101 has another P
An LC 101 and a control host computer 104 are connected via a serial cable 105, and the PLC 10
1 and the control host computer 104 and each PLC
The transfer of control data between the PLCs 101
1 is performed using the communication function.

In the above configuration, the programmable display 103 performs display / control based on screen data.
The screen data includes position information for specifying an area on the base screen and a device 1 corresponding to display and input in the area.
The information indicating the correspondence with the address 02a is set as a unit, and is configured by a combination of the information. Such screen data is generated by the image processing unit 104a of the control host computer 104, and then distributed to each programmable display 103.

On the other hand, a display processing unit 104b of the control host computer 104 communicates with the PLC 101, receives data indicating the state of the device 102a, displays a screen according to the state, and responds to a user input. P
Control data is sent to the LC 101, and the target system 102 is controlled according to the control data. Similarly,
The programmable display 103 displays / controls the state of the device 102a while communicating with the PLC 101.

[0006]

However, the control host computer 104 is provided with a programmable display 103.
Therefore, both the hardware configuration such as a CPU and a memory map and the software configuration such as an operating system are different. Therefore, the display processing unit 104b of the control host computer 104 cannot perform display based on the screen data of the programmable display 103. Therefore, in order to confirm the display content of the programmable display 103, it is necessary to go to the installation location of the programmable display 103 and confirm.

Further, the above-mentioned control system is basically a closed system, and it is not possible to see the state of the control system such as a screen of a programmable display from a remote place.

[0008] The present invention has been made in view of the above circumstances, and enables a screen displayed on a control display device such as a programmable display device to be viewed even in a place separated from a place where the control display device is installed. It is intended to realize a control communication system that can perform the control.

[0009]

In order to solve the above-mentioned problems, a control communication system according to the present invention displays the status of a device on a display screen created in advance and issues a control instruction to the device. A server device having a control display device provided through the display screen and server-side communication means for transmitting device data while acquiring device data indicating the status of the device from the control display device Terminal-side storage means for storing screen data, which is data of the display screen, in a form suitable for display processing, and obtaining the device data corresponding to the screen data stored in the terminal-side storage means by the server A display process for making an inquiry to the communication device on the side and displaying the display screen according to the device data transmitted from the communication device on the server side. Means, and a plurality of terminal devices having terminal-side communication means for communicating via the local network with the server-side communication means for receiving the device data as an inquiry and a response by the display processing means. It is characterized by having.

In the above configuration, in the terminal device, when the display processing means obtains device data corresponding to the image data stored in the terminal side storage means by inquiring of the server side communication means, the display processing means responds to the device data. To display the display screen. Therefore, the same display screen as the display screen displayed on the control display device can be displayed even in the terminal device located at a position separated from the control display device. Also, since communication between the server device and the terminal device is performed between the server-side communication means and the terminal-side communication means via a local network, a Web server or a CG
Efficient communication with a relatively high communication speed can be performed without using a communication mode with a poor execution efficiency via I (Common Gateway Interface).

In the above control communication system, the server device stores the screen data in a form suitable for display processing, and performs communication between the server communication device and the public network. Having a communication relay unit for relaying, the server-side communication unit acquires the screen data stored in the server-side storage unit, while giving the screen data to the communication relay unit, and the display processing unit, Inquiry of the server side communication means by relay communication via the relay means by the public network to the server side communication means for obtaining the screen data stored in the server side storage means and the corresponding device data, According to the screen data transmitted in the relay communication and the device data corresponding thereto, Display screen, and when the screen data stored in the terminal-side storage unit is obtained, the server-side communication unit performs communication via the local network, while the screen data stored in the server-side storage unit is obtained. It is preferable that the server-side communication means perform communication via the public network when acquiring screen data.

With this configuration, in the terminal device, the display processing means inquires of the server-side communication means by relay communication via the relay means via the public network, thereby displaying the image stored in the server-side storage means. When the data and the corresponding device data are obtained, the display screen is displayed according to the screen data and the corresponding device data. Therefore, the same display screen as the display screen displayed on the control display device can be displayed even in the terminal device located at a position separated from the control display device. Further, the display processing means causes the server-side communication means to perform communication via the local network when acquiring the screen data stored in the terminal-side storage means, and acquires the screen data stored in the server-side storage means. When the server side communication means performs communication via the public network, the display processing means obtains any screen data according to a user's instruction, and automatically performs communication via the local network or the public network. Is selected.

[0013] In order to solve the above-mentioned problems, the recording medium of the present invention stores a control communication program for executing each processing for realizing each means of each of the above control communication systems. Therefore, similarly to the above-described control communication systems, it is not necessary to store the screen data in the server device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the control communication system according to the present embodiment includes a host computer 1 and a plurality of programmable displays (hereinafter referred to as displays) 2.
, A plurality of client devices 3 and a plurality of PLCs 4.

The host computer 1 and the display 2
Are connected to each other via a control-side common network 5 capable of performing communication using a common communication protocol. On the other hand, the display 2 and the PLC 4 are individually connected via a dedicated network 6 capable of performing communication using a unique communication protocol for each PLC 4. Further, the host computer 1 and the client device 3 are connected to each other via a public common network 7.

In the present embodiment, when the display 2 performs data communication via the control-side common network 5, control is performed so that communication can be performed using a unified communication protocol regardless of the communication protocol transmitted through the dedicated network 6. A communication protocol (common protocol) common to communication protocols that can be transmitted in the side common network 5 is defined. Specifically, in the present embodiment, a local area network (LAN) such as Ethernet (trademark: Xerox Corporation) is used as the control-side common network 5.
CP / IP is employed.

On the other hand, the public common network 7 as a local network is a local network such as an intranet unified to TCP / IP, which is a standard communication procedure of the Internet. By employing such a public common network 7, it is possible to divert an application program used on the Internet as it is. Since the public-side common network 7 is a network form for exchanging information in a closed area such as in a company, it is necessary to protect important information that cannot be disclosed outside by a firewall.

The PLC 4 includes a CPU / power supply module,
An input unit and an output unit are provided. CPU
The power supply module includes a CPU unit including a CPU and a memory, and a power supply unit that supplies power to each unit of the PLC 4. The CPU controls the devices 8 to be controlled in accordance with the control program. More specifically, the CPU performs arithmetic processing of control data to be given to an output device also as the device 8 based on a signal input from the input device 6 as the device 8 via the input unit. Each of the input unit and the output unit is a portion having an interface function connected to an input / output device, and exchanges a digital signal or an analog signal input / output between these devices with the CPU unit. Has become.

Input devices include sensors (temperature sensors,
Devices such as optical sensors) and switches (pushbutton switches, limit switches, pressure switches, etc.) are used. As the output device, an actuator, a relay, a solenoid valve, a display, or the like is used. These input / output devices are arranged in required parts of various target systems such as a production line.

The display 2 as a control display device has an RA
It has memories such as M, ROM, flash ROM, and VRAM, and an arithmetic processing unit such as a CPU, and controls the operation of each unit of the display 2 by these. As shown in FIG. 2, the display 2 includes a data processing unit 21, interface units (I / Fs in the figure) 22 and 23, and an input unit 2.
4, a display unit 25, a conversion data storage unit 26, and a user memory 27.

The data processing section 21 performs various types of data processing in order to perform protocol conversion processing described later and processing for controlling display of a user screen (display screen).

The data processing unit 21 is connected to both networks 4.
When the communication protocols in 5 are different from each other, the above protocol conversion processing is performed so as to convert from one communication protocol to the other communication protocol with reference to the data stored in the conversion data storage unit 27. This protocol conversion is performed, for example, in International Patent Publication WO99 / 5618.
No. 6 performs the method.

The data processing unit 21 includes a drawing unit 13 described later.
Based on the data (screen data) of the user screen created in the above, the above-described display control is performed so that the display unit 25 draws the user screen using a VRAM or the like. In addition, the data processing unit 21 switches a plurality of user screens in response to a switching instruction input by a user.

On the user screen, the above-mentioned preset parts and tags are combined as symbols on a background screen imitating the target system. In the user screen configured as described above, the operation status of the device 8 and the input operation from the input unit 24 described later are performed based on the movement or display state (color, etc.) of the component or tag according to the actual operation of the device 8. Is reflected as a change. As shown in FIG. 6, for example, each user screen includes a static figure B, such as a nameplate, whose display content is not changed.
Shape, like switches, lamps, meters, etc.
A component graphic J (J1) as a display element for which a display state such as a color or a blinking state is converted is formed on a base screen.

On the other hand, the screen data of the user screen is
As shown in FIG. 3, a file number F of the base screen and an event name N for specifying the operation content to be executed on the base screen
And a processing instruction word W including one or a plurality of pieces of reference information R referred to for each execution event. As shown in FIG. 4, a processing instruction word W as specific information for specifying a display element (part or tag) is transferred to a predetermined screen area (display coordinate range) in accordance with the content of a predetermined device address. In the case of the processing instruction word WL for displaying J, the reference information R includes the display coordinate range (X, Y), the device address A, and, for example, when the component graphic J is a switch, a graphic file indicating ON and OFF. And a file number FL to be referred to at the time of display, such as a file of a figure indicating the above. In addition, as shown in FIG.
In the case of a processing instruction word WT that defines an input operation via
The reference information R includes input coordinate ranges X and Y on the touch panel in the input unit 24 and a device address A that is turned on in conjunction with the designation of the input coordinate range.

The data processing section 21 is software that can be provided in the form of a program medium as package software, and is downloaded from the host computer 1 to the display 2 in advance. In addition, this software can be used when shipping the display 2 if necessary.
It may be installed in the display 2 in advance.

Here, the above-mentioned program medium is a recording medium which is configured to be separable from the host computer 1 and the display 2, and is a tape system such as a magnetic tape or a cassette tape, or a magnetic disk system such as a floppy disk or a hard disk. , CD-ROM, MO, MD, DVD, etc., optical disk system, IC card (including memory card), card system such as optical card, or mask R
It may be a medium that carries a fixed program including a semiconductor memory such as an OM, an EPROM, an EEPROM, a flash ROM, or the like.

Further, since the control communication system has a system configuration connectable to a communication network including the Internet, the control communication system may be a medium that carries a program in a fluid manner so as to download the program from the communication network. . However, when the program is downloaded from the communication network as described above, the download program is stored in the host computer 1 in advance.
, Or may be installed from another recording medium.

The interface unit 22 is connected to the control-side common network 5 for performing communication between the host computer 1 and another display device 2. In communication via the control-side common network 5, P
Output data of the LC 4 is transmitted from the display 2 to the host computer 1, and a control instruction from the host computer 1 is transmitted to the display 2. On the other hand, the interface unit 23 is connected to the dedicated network 6 for performing communication with the PLC 4. In the communication via the dedicated network 6, output data from the PLC 4 is transmitted to the display 2 as described later, and the above-described control instruction is transmitted from the display 2 to the PLC 4.

The input unit 24 is constituted by an input device such as a touch panel for inputting on the display surface of the display unit 25. The display unit 25 is configured by a flat display element such as a liquid crystal panel or an EL panel in order to configure the display 2 in a small size that is easy to incorporate into a control panel or the like.

The conversion data storage unit 26 stores data necessary for protocol conversion processing. This data may be in any format as long as the communication protocol can be converted between the dedicated network 6 and the control-side common network 5, but the converted data storage unit 26 according to the present embodiment.
Stores a data transfer format indicating the format of data transmitted on the dedicated network 6 and a command conversion table indicating the correspondence between command codes transmitted on both networks 5.6.

The user memory 27 includes a drawing unit 13 described later.
And a memory for storing a user screen created by the user, which comprises a flash ROM or the like.

In the display 2 configured as described above, as shown in FIG. 6, the file number F of the base screen is read from the user memory 27 described later at predetermined time intervals by the data processing section 21. The processing instruction word WL, which is the base screen being displayed, is extracted, the content of the device address A of each processing instruction word WL is read from the memory 4a of the PLC 4, and the component graphic J corresponding to the content is displayed on the display surface of the display unit 25. To be displayed. For example, the processing instruction word WL1 stored in the user memory 27 indicates a switch, and corresponds to the device having the device address A1.

When the processing instruction word WL1 is executed, since the content of the device address A1 is "0", the data processing unit 21 determines that the switch is OFF, and stores it in the memory 21a of the data processing unit 21. Among the stored files, the graphic of the file FL1 associated with OFF is displayed in the display coordinate range (X, Y). As a result, in the coordinate range (X, Y), the component graphic J1 indicating the switch in the OFF state is displayed. As described above, when the data processing unit 21 executes the processing instruction word WL1 or the like in the screen data at predetermined time intervals, the state of the device is reflected on the user screen displayed on the display 2.

When the data processing unit 21 receives an input operation of the operator, such as a pressing operation of the input unit 24 on the touch panel, the data processing unit 21 converts the screen data stored in the user memory 27 into the base screen currently displayed. A search is made for an input processing instruction word WT that matches the above input operation, and the device address A indicated by the processing instruction word WT is determined according to the input result.
Change the content of For example, the valid input coordinate range (X,
Y) is set in the same coordinate range as the above-mentioned part graphic J1,
When the processing instruction word WT1 for changing the contents of the same device address A1 is included in the screen data, when the operator presses the part graphic J1 on the screen shown in FIG. The directive WT1 is found. Then, the data processing unit 21 sets the processing instruction word WT
Rewrite the contents of the device address A1 corresponding to No. 1.

Further, after the input operation, the data processing unit 21
Processes the processing instruction word WL1, as shown in FIG.
Since the content of the device address A1 has been changed to “1”, the data processing unit 21 corresponds to the file FL2,
A part graphic J2 indicating ON is displayed on the user screen. As a result, the data processing unit 21 rewrites the content of the device address according to the input operation, and updates the display state of the user screen according to the content of the device address.

The device address A is an address (the above-mentioned input / output number) for specifying a device to be controlled (the input device 6 and the output device 7).
It represents an area of a storage device provided in the display 2, the PLC 4, the host computer 1, or the like, such as the memory 4a of the LC 4. In addition, the above-described device includes an input unit 24
Alternatively, the memory may store data manually input from an input device such as the above. Further, for example, the interface units 22 and 23 of the display 2
By communicating with the PLC 4 and the other display 2 connected to the device, the contents of each address can be obtained or the contents can be changed. Here, the acquisition / change of the contents may be instructed each time, or a cache is prepared in the display 2 and, when the contents are acquired / changed, the cache is accessed, and at a predetermined time interval or at a predetermined time. Communication may be performed for each event to synchronize with the entity of the device address A.

Host computer 1 as server device
Is the same as a general-purpose personal computer,
U, memory (RAM, ROM, etc.), external storage device (hard disk drive, MO drive, etc.), display device and input device (keyboard, mouse, etc.). The host computer 1 includes a server unit 11, an interface unit (I / F in the figure) 12, a drawing unit 13,
Screen data file storage unit 14, file conversion unit 15,
Display file storage unit 16, server-side data communication processing unit 1
7 and an execution unit 18.

The interface unit 12 is connected to the control-side common network 5 for performing communication with the display 2.

The server unit 11 performs data communication processing with the display units 2 via the control-side common network 5,
4 to collect output data of the PLC 4 transferred via the display 2. The output data is data (device data) indicating a device state (numerical value, ON / OFF, etc.) or an output of the PLC 4 itself (alarm output, etc.). In addition, the server unit 11 distributes a screen data file stored in a screen data file storage unit 14 to be described later to the designated display 2.

The server section 11 supplies the output data and the device address to the server-side data communication processing section 17 upon request. Further, upon receiving the instruction to change the content of the device address A from the client device 3, the server unit 11 rewrites the content of the device address A to a value corresponding to the instruction.

The drawing unit 13 is configured such that the display 2 has the devices 8.
This is screen creation software for creating a user screen to be displayed on the display unit 25 so as to have a function as a terminal for inputting setting values for various monitors and devices such as operation statuses and work instructions.

In general, the drawing unit 13 includes a switch, a lamp, a numeric keypad, various displays (for example, a numerical display, a meter display, and a graph display) so that a user screen, which is a screen unique to the user, can be created. It has components (display elements), a tag setting function, a drawing function, a text input function, and the like. As components, not only a single component with a single function, but also a compound switch with multiple functions,
Composite parts such as a counter and a timer are prepared.
Like the single component, such a composite component is registered in a library format so that it can be arranged at a desired position on the base screen by an operation such as drag and drop. The tag as a display element is a desired moving image function set at a desired position (area) in order to express a dynamic change such as a numerical value or a straight line at an arbitrary position on the screen.

The drawing unit 13 also stores the input / output numbers (device addresses) assigned to the input / output terminals of the PLC 4 to which the respective devices 8 corresponding to the components and tags arranged on the created user screen are connected. Allocate to the above parts and tags via variables.

The screen data file storage unit 14 stores the screen data for one screen of the user screen created by the image creating unit 13 as one file (screen data file). The screen data stored here is delivered to the display 2 by the server unit 11 as described above as necessary, and downloaded to the user memory 27.

The file converter 15 converts the screen data file stored in the screen data file storage 14 into an HT
ML (HyperText Markup Language) file and XML
Generated by converting to an L (extensible Mark-up Language) file. The file conversion unit 15 converts, for example, the file number F of the base screen from the screen data for the display 2.
Is a predetermined value, the processing instruction word of the unit screen (processing instruction word W
L. WT, etc.) are sequentially extracted, an XML element corresponding to the extracted XML element is generated, and the content of the XML element is set according to the processing instruction word, thereby creating an XML file of the unit screen.

The display file storage unit 16 as the server side storage means includes an HTML file storage unit 16a and an XML file storage unit 16a.
It has a file storage 16b and a display applet storage 16c. The HTML file storage unit 16a stores an HTML file generated by the file conversion unit 15 and suitable for display processing. On the other hand, the XML file storage unit 16b stores the XML file generated by the file conversion unit 15 and suitable for display processing. The display applet storage unit 16c stores an applet for causing the host computer 1 to display a user screen displayed on the display device 2.

Here, the above-mentioned HTML file, XML
Describe files and applets.

First, an XML file stored in the XML file storage section 16b is created for each unit screen (one user screen) included in the screen data for the display device 2. Each XML file includes an XML element indicating each processing instruction word related to the unit screen.

For example, the processing data (display tag) WL for displaying the base screen (unit screen) = 1 (main screen) is included in the screen data for the display 2 in the format shown in FIG. If there is, the XML element corresponding to the main screen includes a Tag element E1 corresponding to the processing instruction word WL as shown in FIG. This Tag element E1
Include a TagName element E11, an X element E12 and a Y element E13, a LibraryNo element E14 corresponding to an event name, a display coordinate range, a reference file number, a device address, and the like.
BitSymbolName element E15 and the like are included. Librar
The yNo element E14 represents a registration number in a library tag for using a figure registered in the library by the user. The content (content) of each of the elements E11 to E15 is, for example, “L_0000”, −232 and 120, 101, 0 according to the content of the processing instruction word WL, respectively.
It is set to 10100.

In a Tag element E2 (here, touch panel input tag) corresponding to the input processing instruction word (input tag) WT shown in FIG. 5, an event name, a device address,
TagName element E2 corresponding to each valid input range
1. The contents of the SymbolName element E22, X element E23 and Y element E24, X2 element E25 and Y2 element E26 are set according to the contents of the processing instruction word WT.

On the other hand, as shown in FIG. 9, a character string P1 for causing the above-described applet to be executed by a virtual machine 33 of the client device 3 as shown in FIG.
1 and a character string P1 required as an HTML document such as “<HTML>” or “<TITLE>”. Also, HT
The ML file may include, for example, a character string P2 conforming to the HTML format, such as a character string describing an image displayed on the display 2 displayed by the applet or an image. Further, the HTML file may include a character string P12 for executing an applet for switching unit screens.

In the present embodiment, an XML file is provided for each unit screen.
The information (global information) related to the entire screen data (display 2) such as the specification of the unit screen to be displayed first and the specification of display 2 when the browser 34 displays the above HTML file is the above-mentioned characters. It is included in column P11. In the case of the present embodiment, the information is specified as a parameter when executing the applet. For example, the first unit screen is the attribute name “BASESCR” of the PARAM element.
(In this example, “1”).

The applet stored in the applet storage unit 16c is referred to by the above-mentioned HTML file, and is equivalent to the operation when the display 2 displays or operates the unit screen while referring to the above-mentioned XML file. The behavior of
This is a program to be executed by the execution unit 18 described later. This applet is realized as bytecode described in Java (registered trademark) language.

The above applet is a class in which a method corresponding to a type of a processing instruction word (tag) that can appear in screen data is defined, and a method for referring to an XML file and calling a method corresponding to the tag type. Is defined. The execution unit 18 that executes this applet refers to the XML file and displays the XML indicating the tag.
Based on the element, you can call the method according to the tag type.

For example, among the methods executed by the execution unit 18, the method corresponding to the tag type is a display tag,
This drawing method is called at a predetermined time interval, requests data of a specific device address to the server unit 11, and performs display according to the response. The method corresponding to the input tag is an input method that is called when an input event occurs and requests the server unit 11 to write data corresponding to the input result to a specific device address.

Here, in the screen data according to the present embodiment, the switching operation of each unit screen is also realized as an input tag, and the input tag has a device address as a device address in the storage area in the display 2. Among them, a system area in which data indicating the currently displayed unit screen is stored is associated.

Therefore, of the above input methods,
The input method for requesting an instruction to change to the specific system area is the same as the normal input method.
1, and transmits an XML file corresponding to the unit screen after the change. Thus, the host computer 1 and the display 2 can always display the same unit screen.

The input method may change the contents of an alternative storage area provided in the host computer 1 instead of transmitting the change instruction to the specific system area. In this case, when referring to the system area by another method, the alternative storage area is referred to instead of making an inquiry to the server unit 11. In this case, the host computer 1 can display a unit screen for the display 2 that is different from the unit screen currently displayed on the display 2.

Further, for example, the same unit screen as that of the display unit 2 can be designated by setting the parameters at the time of execution of the applet described later, or by displaying a menu in conjunction with the selection operation of the unit screen and allowing the selection. Display or
Each of the above methods may be created so that it is possible to select whether to display a different unit screen. In this case, for example, when the user wants to monitor the operation of the operator of the display unit 2 in spite of using the same applet or XML file, the former is selected and the display unit 2 is displayed separately from the operation of the operator. If you want to monitor, you can choose the latter.

The method for referring to the XML file is, for example, an XML file indicating a tag from the XML file.
The L element is extracted, an instance of a class corresponding to the type of the tag (for example, the content of the TagName element in the XML element) is generated, and the parameter of the tag (for example, the XML element in the XML element) is added to the field of the instance. For example, the execution unit 18 can execute a method corresponding to the XML file by setting the content of each element).

The server-side data communication processing unit 17 as a server-side communication unit communicates with an applet described later in the client device 3 via the client-side data communication processing unit 32. The server-side data communication processing unit 1
Reference numeral 7 functions as a center of communication processing in the host computer 1, and accesses from a client-side data communication processing unit 32 of the client device 3, and accesses from the display file storage unit 16 and the server unit 11 in the host computer 1. And a communication process for accessing the server unit 11 and the client-side data communication processing unit 32. In this communication processing, for example, HT
The ML file, the XML file, and the device data are sent to the execution unit 18 in response to a request for an applet stored in the applet storage unit 16c, and in response to a request from an applet stored in an applet storage unit 31c to be described later. By accessing the server unit 11, the data is returned to the client-side data communication processing unit 32.

The server-side data communication processing unit 17
It has a user account file, and performs protection processing according to the level of access from the client device 3 using this user account file.
The server-side data communication processing unit 17 performs, for example, a user name, a password,
Access levels, alarm log creation, comments, etc. are set for each user. The access level includes a level for reading the display contents of the display 2, a level for permitting not only reading but also writing, a level for enabling transmission of a reset command to the display 2, and creation of an alarm log file. For example, the level of permission is given.

The reset command described above is a command for resetting the display 2 as a means for recovering from the occurrence of an abnormality such as a communication error in the display 2. By transmitting such a command from the host computer 1, the host computer 1 can take recovery measures. The alarm log file is a file for causing the host computer 1 to display alarm information from the PLC 4 stored in the display 2.

The execution unit 18 is a program for executing an applet stored in the applet storage unit 16c, and has a function equivalent to a virtual machine.

The server section 11, server-side data communication processing section 17, and execution section 18 are software that can be provided in the form of program media as package software, and are installed in the host computer 1 in advance. This program medium is also a recording medium that is configured to be separable from the host computer 1 and the display 2, similarly to the above-described program medium. The file conversion unit 15 is also software that can be provided in the form of program media as package software, and is installed in the host computer 1 in advance. This program medium also has a host computer 1 and a display 2 similar to the aforementioned program medium.
A recording medium configured to be separable from the recording medium.

The client device 3 as a terminal device
For example, it is configured by a general-purpose personal computer or the like, and includes a display file storage unit 31, a client-side data communication processing unit 32, a virtual machine 33, and a browser.

The display file storage unit 31 as a terminal side storage unit has an HTML file storage unit 31a, an XML file storage 31b, and a display applet storage unit 31c. HTML file storage unit 31a and XM
The L file storage unit 31b includes the HTML file storage unit 16a and the XML file storage unit 16b, respectively.
, The same file as the HTML file and the XML file. The display applet storage unit 31c stores an applet created in advance for each specification of the client device 3.

The applet stored in the applet storage section 31c has almost the same function as the applet stored in the above-described applet 16c, but displays the user screen displayed on the display 2 by the client device 3. This is different from the above-described applet in that it is executed by the virtual machine 33 in order to enable operation from the user screen. Therefore, the virtual machine 33 executing this applet refers to the XML file and
A method according to the tag type is called based on the ML element. For example, of the methods executed by the virtual machine 33, the method corresponding to the display tag is the above-described drawing method, and the method corresponding to the input tag is the above-described input method.

Virtual machine 3 as display processing means
3 is capable of executing a Java language program and converts platform-independent bytecode into native code of the client device 3. On the other hand, browser 3
4 causes the virtual machine 33 to execute the above-described applet received via the client-side data communication processing unit 32. Also, a browser 34 as a display processing means
Is H from the received HTML file storage unit 31a.
The applet specified in the TML file is acquired via the client-side data communication processing unit 32, and is executed by the virtual machine 33.

The above-described virtual machine 33 and browser 34 can be realized by general-purpose browser software preinstalled in many computers. therefore,
These computers can operate as the client device 3 without installing a special program. Also, if a program for downloading a program via various communication paths including the control-side common network 5 and the public-side network 7 is installed in the computer in advance, the computer is connected to the computer via these communication paths. The above program can be distributed to

The client-side data communication processing unit 32 as the terminal-side communication means communicates with the server-side data communication processing unit 17 via the public-side common network 7 in response to the request from the applet. Further, the client-side data communication processing unit 32 functions as a center of communication processing in the client device 3, and accesses from the display file storage unit 31, access from the server-side data communication processing unit 17, access from the virtual machine 33, and the like. To perform communication processing for. In this communication processing, for example, in response to a request from an applet, the HTML file and the XML file from both the file storage units 31a and 31b are downloaded to the virtual machine 33, while the device data obtained from the server unit 11 is It is obtained by accessing the server-side data communication processing unit 17.

In the control communication system configured as described above, when the host computer 1 is instructed to display the user screen displayed on the display 2 on the host computer 1, the host computer 1 stores the user screen in the HTML file storage section 16a. The stored HTML file is opened. Then
The execution unit 18 extracts and executes each APPLET element (“<APPLET>” to “</ APPLET>”) in the HTML file received via the server-side data communication processing unit 17. Further, the execution unit 18 transmits the XML file necessary for displaying the user screen to the server-side data communication processing unit 17.
Via the XML file storage unit 16b. Further, the execution unit 18 refers to the XML file,
The user screen of the display 2 specified by the HTML file is displayed on a display unit (not shown) provided in the host computer 1, and control according to the operation on the user screen is also provided in the host computer 1. An instruction is given by an input from an operation unit (not shown).

As described above, by causing the execution unit 18 to execute the applet, the user screen displayed on the display 2 is displayed on the host computer 1 and the host computer 1 can perform an input operation from the user screen. it can.

Next, a process for displaying the screen data of the display 2 on the client device 3 in the above-described control communication system will be described with reference to the flowchart of FIG.

When the process of displaying the user screen displayed on the display 2 on the client device 3 is instructed by the user on the client device 3 side, the applet storage unit 31
The applet stored in the HTML file storage unit 31a is a default file default.htm.
(S1). In this state, the client device 3
An HTML file corresponding to a desired user screen of the display 2 to be displayed in the HTML file storage unit 31
a, the client-side data communication processing unit 32
Is activated (S2).

The client-side data communication processing unit 32
When the server-side data communication processing unit 17 in the host computer 1 is accessed via the public-side common network 7, the server-side data communication processing unit 17 uses the above-described security setting to set the user name received from the client device 3, It is checked whether the display / control on the user screen is permitted to the client device 3 or the user by confirming whether the password or the like is registered in advance (S3), The access from the client device 3 which is not permitted is rejected. At this time, the access level is also checked.

When the access is permitted, the client-side data communication processing unit 32 accesses the server unit 11 via the server-side data communication processing unit 17 and instructs the user to display a user screen of a certain display 2. (S4). The server-side data communication processing unit 17 restricts access to data of the display 2 via the server unit 11 according to a preset access level.

Next, the browser 3 of the client device 3
4 is H through the client-side data communication processing unit 32
An HTML file is obtained from the HTML file storage unit 31a, and each APPLET element (“<APPL
ET> ”to“ </ APPLET> ”), also obtains the applet specified from the HTML file storage unit 31a and causes the virtual machine 33 to execute the applet (S5). XML file necessary for the client side data communication processing unit 3
2 from the XML file storage unit 31b,
An instance corresponding to each processing instruction word is generated with reference to the XML file (S6). Of these instances, the drawing method of the instance corresponding to the processing instruction for display is executed at predetermined time intervals. As a result, the virtual machine 33 queries the server unit 11 about the contents of the device address A via communication between the client-side data communication processing unit 32 and the server-side data communication processing unit 17 (S7).

On the other hand, upon receiving the inquiry, the server section 11 reads data from the area corresponding to the device address A in the user's storage area corresponding to the applet, and transmits the data to the client device 3 by the above-described communication ( S8). The data is the public common network 7
Is transmitted to the client device 3 via the client device 3 according to the data (contents of the device address A), a predetermined display area (X, Y) on the user screen displayed on the client device 3 is transmitted. ) Is updated (S9).

Here, the XML file and the HTML file for calling the applet are generated based on the screen data, and each instance refers to the same device address as the corresponding processing instruction word in the screen data. It is set as follows. The drawing method of each instance is created so as to display the same image as the processing instruction word when the contents of the device address are the same. Therefore, when the applet is executed, a component graphic J1 (J2) indicating the state of the device is displayed on the display surface of the client device 3, similarly to the screens shown in FIGS.

The above HTML file includes a plurality of applets.
From 4, drawing is performed with relative coordinates in the screen area (for example, relative coordinates based on the upper left corner or the like). Therefore, the client device 3 can display the status of the device regardless of the number and order of the applets included in the HTML file.

On the other hand, when an input operation such as a mouse operation is performed during the execution of the applet, the virtual machine 33 sets the input method of the instance corresponding to the input operation among the instances corresponding to the input processing directive. Execute As a result, the virtual machine 33 requests the server unit 11 via the communication with the data communication processing units 32 and 17 to write the data corresponding to the input result to the specific device address. The server unit 11 rewrites the contents of the area of the requested device address A in the storage area. The rewritten content is transmitted to the display 2 via the control-side common network 5. As a result, the user screen displayed on the client device 3 includes:
After writing, when the above input method is executed,
The operation result is reflected as in the case of the display 2.

Thus, even when the client device 3 is connected to the host computer 1 via the public common network 7 from a place separated from the display device 2, the client device 3 has the same contents as the screen of the display device 2. Display the screen and control the device status with the same operation.

Here, the host computer 1 synchronizes the content stored in the server section 11 with the entity of the device address stored in the display 2. When the synchronization is performed, the transmission direction is determined in accordance with, for example, a change time or an operation priority.

For example, when updating the storage contents of the server unit 11 in accordance with the contents of the device address of the display 2,
The server unit 11 acquires the contents of the device address as in the case of the display unit 2 and transmits the acquired contents as device data. Conversely, when the change of the storage content of the server unit 11 is transmitted to the entity of the device address, the server unit 11 reads out the stored device data and accesses the display unit 2 when the display unit 2 accesses. Send to

In this embodiment, the HTML file and the XML file generated based on the screen data are stored in the HTML file storage unit 16a and the XML file storage unit 16b, but the file formats are not limited to these. Not done. For example, a file for displaying based on device data, such as an HTML file for displaying data obtained by statistically processing device data, may be made public.

For example, based on the screen data and the device data, the host computer 1 converts an image file in a format that can be displayed with the same contents as the screen display of the display unit 2 (such as a bitmap format or a JPEG format file). It may be generated by a file conversion unit instead of the unit 15. In this case, although the state of the device cannot be controlled from the client device 3, the display device 2 can be controlled from a remote location.
Screen can be displayed. Also in this case, each display 2
It is not necessary to previously install the program for displaying the user screen on the host computer 1, so that it is possible to reduce the labor, time and cost of installation.

As described above, in the control communication system according to the present embodiment, the applet installed in each client device 3 includes the client-side data communication processing unit 32 and the server-side data communication processing unit 17. The server unit 11 of the host computer 1 is configured to send an inquiry for causing the virtual machine 33 to execute a display operation or an instruction to change the content of a device address via communication between the servers. As a result, the contents of the user screen displayed on the display device 2 are simultaneously viewed on the display device 2 by the plurality of client devices 3 installed at a location separated from the location where the display device 2 is installed. And an operation on the user screen can be performed.

Further, since the host computer 1 has the execution unit 18 accessible to the data communication processing unit on the herber side, the host computer 1 executes the applet stored in the applet storage unit 16c. therefore,
The host computer 1 can also browse the contents of the user screen displayed on the display 2 at the same time as the content is displayed on the display 2, and can also perform operations on the user screen.

HTTP (Hyper Text Transfer Protocol)
A server device that performs general Internet communication using the Web server needs to include Web server software and CGI for exchanging information with a client device. Is not so good. In contrast, in the control communication system described above, communication between the host computer 1 and the client device 3 is performed directly through communication between the server-side data communication processing unit 17 and the client-side data communication processing unit 32. It is done on a regular basis. This improves the communication speed,
The exchange of information between the host computer 1 and the client device 3 can be performed efficiently.

Further, in this control communication system, the security function of the Web server software cannot be used for access from the client device 3 because the host computer 1 does not have the Web server software. However, in the server-side data communication processing unit 17, access to data on the display 2 is restricted at an access level set in advance for each user, so that maintainability can be improved. In addition, with such an access restriction method, it is possible to set access at a detailed level without collectively granting or denying access at all levels as in general access restriction in Internet communication. . therefore,
For example, it is possible to perform access management such as permitting a higher-level access to a user in an important position deeply involved in the control communication system such as a system administrator.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. Note that, in the present embodiment, components having the same functions as those of the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 11, the control communication system according to the present embodiment includes a host computer 1 and a plurality of programmable displays (hereinafter, referred to as displays) 2.
, A plurality of client devices 3, and a plurality of PLCs 4 ...
And a plurality of client devices 9. The client device 9 is connected to the host computer 1 via the Internet 10 as a public network so that Internet communication is possible.

The host computer 1 of the present embodiment is different from the host computer 1 of the first embodiment in that a public server unit 19 and a CGI (Common Ga
teway Interface) 20.

The client device 9 as a terminal device is
For example, a virtual machine 91 and a browser 92
And The virtual machine 91 as a display processing unit is capable of executing a Java language program, and converts a bytecode into a native code of the client device 9. On the other hand, browser 92 as display processing means
Communicates with a device connected to the Internet 10 and causes the virtual machine 91 to execute the received applet. In addition, the browser 92 can receive a document such as an HTML document from an arbitrary server device using a protocol such as HTTP, and browse the document.

The virtual machine 91 and the browser 92 can be realized by general-purpose browser software preinstalled in many computers. therefore,
These computers can operate as the client device 9 without installing a special program. If a program for downloading a program via various communication paths including the Internet 10 is installed in the computer in advance, the program may be distributed to the computer via the communication path. Can also.

When the browser 92 is instructed to access the host computer 1 and display a user screen as a Web page on the client device 9, that is, the HTML file stored in the HTML file section 16a and the XML file 16b When acquiring the XML file and the XML file, it recognizes that the communication using HTTP is performed. On the other hand, when the browser 34 of the client device 3 is instructed to display the user screen on the client device 3, that is, the HTML file unit 31a and the XML file 3
When acquiring the HTML file and the XML file stored in 1b, when the user opens the HTML file stored in the HTML file storage unit 31a, it recognizes that communication through the client-side data communication processing unit 32 is performed.

Public server section 19 as communication relay means
Is composed of general-purpose Web server software or the like. In response to a request from the client device 9, for example, an HTML file and an XML file requested by the client device 9 based on a URI (Universal Resource Interface), or The applets are determined and distributed to the client device 9. The public server unit 19 sends the above-described applet to the client device 9 via the Internet 10. The host computer 1 functions as a Web server on the Internet 10 by including the public server unit 19.

The CGI 20 as a communication relay means is a platform-independent interface program provided in a server device in general Internet communication. This CGI 20 is the browser 9
2 accesses the server-side data communication processing unit 17 via the public server unit 19, and outputs a response (HTML data) from the server-side data communication processing unit 17 to the access to the public server unit 19.

In the host computer 1 according to the present embodiment, the server unit 11 determines the number of nodes accessed from the client device 9 via the CGI 20 to the server-side data communication processing unit 17 and the server-side data communication processing unit 17. Count the number of relay accesses to other stations via
It has a function to display it. This facilitates access management, so that the server-side data communication processing unit 1
7 can be grasped, and unauthorized access can be verified.

Next, a description will be given, with reference to the flowchart of FIG. 12, of a process in the case where the screen data of the display 2 is displayed on the client device 9 in the above-described control communication system.

First, the client device 9 accesses via the public server unit 19 in the host computer 1 via the Internet 10 and instructs to display a user screen of a certain display 2 (S11). Then
The public server unit 19 confirms whether or not the identification number, the password, and the like received from the client device 9 are registered in advance. Alternatively, it is checked whether or not the user is permitted (S1).
2) Reject access from the client device 9 that is not permitted. At this time, the server-side data communication processing unit 17 checks whether or not the client device 9 can access the server-side data communication processing unit 17 as described above (S3 in FIG. 10).

When access is permitted and a request for generating a public file is received from the client device 9 through access to the server-side data communication processing unit 17 via the CGI 20, the file conversion unit 15 A public file such as an HTML file and an XML file is generated based on the screen data file stored in the storage unit 14 and stored in a user area in the HTML file storage unit 16a and the XML file storage unit 16b. (S13). Public server unit 19
Stores the HTML file for displaying the user screen requested by the client device 9 only for the authorized regular client device 9 in the HTML file storage unit 1.
6a, the file is relayed from the server-side data communication processing unit 17 via the CGI 20, and further transmitted from the public server unit 19 to the client device 9 via the Internet 10 (S14). Further, a user screen is displayed by the client device 9 using the file (S15), and a series of processing is completed.

Here, the processing in S15 will be described in more detail.

First, the browser 92 of the client device 9
Represents each APPLET element (“<APPLET>
“</ APPLET>” to the applet specified from the server unit 11 and executed by the virtual machine 91. The virtual machine 91 also outputs an XML file necessary for displaying the user screen to the public server. The virtual machine 91 obtains the XML from the unit 19.
It communicates with the public server unit 19 while referring to the file, and displays the user screen of the display unit 2 specified by the HTML file.

More specifically, the virtual machine 91
Referring to the ML file, an instance corresponding to each processing instruction word is generated. Of these instances, the drawing method of the instance according to the processing instruction for display is
It is executed at a predetermined time interval. As a result, the virtual machine 91 inquires of the public server unit 19 about the contents of the device address A.

Upon receiving the inquiry, the public server section 19 causes the server section 11 to read data from the area corresponding to the device address A in the storage area of the user corresponding to the applet and transmit the data to the client device 9. When the data is transmitted to the client device 9 via the Internet 10, the above-mentioned drawing method performs a predetermined display on the user screen displayed on the client device 9 according to the data (contents of the device address A). The display of the area (X, Y) is updated in the same manner as the display update in the client device 3 described above.

On the other hand, the virtual machine 91 communicates with the public server unit 19 while referring to the XML file,
From the user screen displayed as described above, the control corresponding to the operation on the user screen is instructed. At this time, when an input operation such as a mouse operation is performed during the execution of the applet, the virtual machine 91 executes an input method of an instance corresponding to the input operation among the instances corresponding to the input processing directive. I do. This allows
The virtual machine 91 stores data according to the input result,
A request is made to the server unit 11 via the public server unit 19 to write to a specific device address. Server unit 11
Rewrites the contents of the area of the requested device address A in the storage area. The rewritten content is transmitted to the display 2 via the control-side common network 5. As a result, the operation result is reflected on the display surface of the client device 3 when the above-described drawing method is executed after writing, similarly to the display device 2.

Here, the host computer 1 synchronizes the contents stored in the server section 11 with the entity of the device address stored in the display 2 as in the configuration of the first embodiment.

In this embodiment, as in the first embodiment, the file format is an HTML file and an X file.
It is not limited to the ML file.

For example, based on the screen data and the device data, the host computer 1 can display an image file (a bitmap format or a JPEG format file) that can be displayed by the client device 9 with the same contents as the screen display of the display 2. And the like, and transmit the file to the client device 9. In this case, although the state of the device cannot be controlled from the client device 9, the screen of the display 2 can be displayed from a remote place. Also in this case, it is not necessary to install a program for displaying the screen of each display 2 in the client device 9 in advance, so that it is possible to reduce the labor, time and cost of installation.

However, if the communication speed between the public server unit 19 and the client device 9 is low, such as when the client device 9 is communicating via the Internet 10, when data indicating the screen is transmitted, the screen of the client device 9 is displayed. The update speed decreases.

On the other hand, in the present embodiment, an applet that causes the client device 9 to perform the above inquiry, change instruction, and display operation is distributed, so that the amount of data transmission can be significantly reduced, and the response in the client device can be reduced. Speed can be greatly improved. Further, for example, a user interface such as cursor movement can be processed on the client device side, so that the response speed can be further improved.

Also, in the present embodiment, the case where the applet is made public has been described as an example. However, instead of the applet, the applet is created by compiling a programming language such as basic, for example. Almost the same effects can be obtained by distributing an execution program that causes the client device 9 to execute the operation.

However, as in the present embodiment, when the virtual machine 91 of the client device 9 interprets and displays and controls the applet, if the client device 9 has a virtual machine, the operating system of the client device is used. Even if the machine language executable by the (OS) or the CPU is different, the applet can be executed. Therefore, the display / control can be performed by more client devices 9 in the same manner as the display device 2 without increasing the types of applets distributed by the public server unit 19.

Further, in the control communication system shown in FIG. 11, an example has been described in which the client device 3 and the client device 9 are constituted by different computers, but as shown in FIG. 9 may be configured together in one computer.

In this control communication system, the virtual machine 91 of the client device 9
And the browser 92 of the client device 9 is functionally integrated with the browser of the client device 3. Also,
When displaying the user screen on the client device 3 based on the file of the host computer 1, the browser 34 recognizes the user screen as described above and causes the server-side data communication processing unit 17 to perform communication via the Internet 10. On the other hand, when the user screen is displayed using the file of the client device 3, the user screen is recognized as described above, and the server-side data communication processing unit 17 performs communication via the public-side common network 7.

Therefore, in such an integrated client device 3, simply by the user selecting one of the communications, the browser 34 performs either the communication via the Internet 10 or the communication via the public common network 7. Perform a process that is appropriate for one of them. Therefore, the user can display the user screen and perform an operation from the displayed user screen without being aware of the difference in the communication mode. As a result, the user performs a special operation between the communication via the general Internet 10 via the CGI 20 and the communication via the public-side common network 7 which can perform higher-speed communication than this communication. Can be used without.

[0121]

As described above, the control communication system of the present invention provides a control display device for displaying the status of a device on a display screen created in advance, and a device data of the device from the control display device. A server device having server-side communication means for transmitting the device data, a terminal-side storage means for storing the screen data of the display screen in a form suitable for display processing, and storing the screen data in the terminal-side storage means Display processing means for inquiring the server-side communication means to obtain the device data corresponding to the screen data, and displaying the display screen according to the device data transmitted from the server-side communication means, and The server-side communication means communicates with the display processing means for receiving the inquiry and the device data as a response to the inquiry. A configuration in which a plurality of terminal devices having a terminal-side communication means for via a local network between.

Thus, in the terminal device, when the display processing means acquires device data corresponding to the image data stored in the terminal side storage means from the server side communication means, the display screen is displayed in accordance with the device data. indicate. Therefore, the same display screen as the display screen displayed on the control display device can be displayed even in the terminal device located at a position separated from the control display device. In addition, since the communication between the server device and the terminal device is performed via the local network between the server-side communication means and the terminal-side communication means, the communication between the server device and the terminal device is performed through Web server software as in general Internet communication. Efficient communication with a relatively high communication speed can be performed without using a communication form with poor execution efficiency. Therefore, there is an effect that it is possible to efficiently browse the display screen on the terminal device located at a place separated from the control display device.

In the above control communication system, the server device stores the screen data in a form suitable for display processing, and performs communication between the server communication device and the public network. Having a communication relay unit for relaying, the server-side communication unit acquires the screen data stored in the server-side storage unit, while giving the screen data to the communication relay unit, and the display processing unit, The screen data stored in the server-side storage means and the device data corresponding to the screen data are inquired to the server-side communication means by relay communication via the relay means by the public network, and the server-side communication means According to the screen data transmitted in the relay communication and the device data corresponding thereto, Display screen, and when the screen data stored in the terminal-side storage unit is obtained, the server-side storage unit performs communication via the local network, while the screen data stored in the server-side storage unit is obtained. When acquiring screen data, the server-side communication means performs communication via the public network.

With this, in the terminal device, when the display processing means acquires the image data stored in the server-side storage means and the device data corresponding thereto by the relay communication through the relay means by the public network, the screen data is And the display screen is displayed according to the device data corresponding thereto. Therefore, the same display screen as the display screen displayed on the control display device can be displayed even in the terminal device located at a position separated from the control display device. Also, the display processing means causes the server-side communication means to perform communication via the local network when acquiring the screen data stored in the terminal-side storage means, and acquires the screen data stored in the terminal-side storage means. When the server side communication means performs communication via the public network, the display processing means obtains any screen data according to a user's instruction, and automatically performs communication via the local network or the public network. Is selected. Therefore, there is an effect that communication suitable for the acquisition source of the screen data can be performed without the user being conscious.

The recording medium of the present invention has recorded thereon a control communication program for executing each processing for realizing each means of the above-mentioned control communication system. Therefore, the same effects as the effects of the above-described control communication systems are obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a control communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a programmable display in the control communication system.

FIG. 3 is an explanatory diagram showing a data structure of a processing instruction word included in the screen data.

FIG. 4 is an explanatory diagram showing an example of a data structure of a display processing instruction word among the processing instruction words.

FIG. 5 is an explanatory diagram showing an example of a data structure of an input processing instruction word among the processing instruction words.

FIG. 6 is an explanatory diagram showing a relationship between screen data and a displayed user screen when a switch in a programmable display of the control communication system is in an OFF state.

FIG. 7 is an explanatory diagram showing a relationship between screen data and a displayed user screen when a switch in a programmable display of the control communication system is in an ON state.

FIG. 8 is an XM stored in an XML file storage unit in the public server computer of the control communication system.
FIG. 4 is an explanatory diagram illustrating an example of an L file.

FIG. 9 shows H stored in an HTML file storage unit of the public server computer of the control communication system.
FIG. 4 is an explanatory diagram illustrating an example of a TML file.

FIG. 10 is a flowchart showing a processing procedure for displaying a user screen displayed on a programmable display on a client device in the control communication system.

FIG. 11 is a block diagram showing a configuration of a control communication system according to another embodiment of the present invention.

12 is a flowchart showing a processing procedure for displaying a user screen displayed on a programmable display on a client device in the control communication system of FIG. 11;

FIG. 13 is a block diagram showing another configuration of the control communication system according to another embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration of a conventional control system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Host computer (server apparatus) 2 Programmable display (control display apparatus) 3 Client apparatus (terminal apparatus) 7 Public side common network (local network) 8 Device 10 Internet (public network) 16 Display file storage means (server side storage) 17) server-side data communication processing unit (server-side communication unit) 19 public server unit (communication relay unit) 20 CGI (communication relay unit) 31 display file storage unit (terminal-side storage unit) 32 client-side data communication processing unit ( Terminal side communication means) 33 Virtual machine (display processing means) 34 Browser (display processing means) 91 Virtual machine (display processing means) 92 Browser (display processing means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B076 AB17 BA04 BB06 5C025 BA25 BA28 CA03 CA09 CB03 CB10 5C064 BA01 BC18 BC23 BD02 BD08 BD09 5H220 BB05 CC09 CX06 CX08 EE01 EE09 EE10 HH01 HH04 JJ15 JJ29

Claims (3)

[Claims] 1. A control display device for displaying a status of a device on a display screen created in advance, and giving a control instruction to the device via the display screen. While acquiring device data which is data indicating the status of the server, the server device having server-side communication means for transmitting the device data, and the screen data which is the data of the display screen are stored in a form suitable for display processing. Terminal-side storage means, and inquires of the server-side communication means to obtain the device data corresponding to the screen data stored in the terminal-side storage means, and in accordance with the device data transmitted from the server-side communication means Display processing means for displaying the display screen, and the data which is an inquiry and a response to the inquiry by the display processing means. Control communication system characterized by comprising a plurality of terminal devices having a terminal-side communication means for via a local network between the server side communication means to communicate for receiving the chair data. 2. The server device according to claim 1, wherein said server device has a server storage means for storing said screen data in a form suitable for display processing, and a communication relay means for relaying communication between said server communication means and a public network. The server-side communication means obtains the screen data stored in the server-side storage means, while providing the screen data to the communication relay means, and the display processing means stores the screen data in the server-side storage means. Inquiry of the server-side communication means by relay communication via the relay means by the public network to obtain the obtained screen data and the device data corresponding to the screen data, and transmitted by the relay communication from the server-side communication means. Displaying the display screen according to the screen data and the device data corresponding to the screen data; The server-side communication means performs communication via the local network when acquiring the screen data stored in the storage means, and the server-side communication means when acquiring the screen data stored in the server-side storage means. 2. The control communication system according to claim 1, wherein the control unit causes the communication unit to perform communication via the public network. 3. A computer-readable recording medium on which a control communication program for operating the control communication system according to claim 1 or 2 is recorded. A recording medium on which a communication program is recorded.