JPH0969001A - Operation display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation display unit which enables screen data pro vided in the operation display unit to easily be used by a screen generating device which generates a display program for the operation display unit. SOLUTION: A screen data transmitting program P2 is stored in a program storage means 2A of the operation display unit PDA. With the signal from a screen data transmission start switch SW1, the screen data transmitting program P2 is started and screen data DD consisting of a display program stored in the screen data storage means 21 and standard display data as fixed data determining a display format referred to by this display program are transmitted to the screen generating device MC through a 2nd input/output part 7. The screen generating device MC generates a new display program on the basis of the transmitted screen data DD and transmits the new program to the operation display unit PDA.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation display device for displaying the state of a controlled object controlled by a control device such as a programmable controller and for transmitting an operation signal to the control device.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional operation indicator (hereinafter referred to as POD (Programmable Operati).
on Display)) is an explanatory view of an example. In the figure, A1
Is a programmable controller (Programmable C) that mainly performs sequence control, which is one type of control device.
ontroller is abbreviated as PC in the following explanation) and PL
Is a plant controlled by PCA1. Plant PL
Is a plant that heats the liquid LQ within a predetermined temperature range and sends it to the next process, and the liquid LQ is a tank via the valve V2.
The liquid LQ, which is injected into TK and heated by the heater HT that circulates the steam installed in the tank TK, is heated by the pump.
It is sent to the next process by P through the valve V3. The flow rate of vapor to the heater is adjusted by the valve V1, the temperature of the liquid LQ is measured by the thermometer T, the liquid level of the liquid LQ in the tank TK is measured by the liquid level gauge H, and the delivery flow rate is measured by the flow meter FL. To be measured. PCA1 controls the valve V1 so that the flow rate of the vapor becomes an appropriate value from the data of the temperature from the thermometer T and the data of the delivery flow rate from the flow meter FL, and from the data of the liquid level gauge H, The amount of the liquid LQ flowing in through the valve V2 is controlled so that the liquid level in the tank TK falls within a predetermined range. In order to perform the above control, the PCA1 has signal lines for transmitting signals S1 to S3 for communicating among the valves V1, V2, V3, the motor M, etc., which are the objects of operation of the PCA1, for each operation target. Signals S10 to S12 from the thermometer T, the liquid level gauge H, the flowmeter FL, etc., which are necessary and indicate the state of the plant PL.
A signal line from each signal source for transmitting, etc. is required. Therefore, many signal lines are wired between PCA1 and the plant PL.

As shown in the above example, a PC is generally used.
Since a large number of signal lines need to be wired between the control target and the control target, and noise ingress into the signal control line must be limited to an allowable level or less, the PC should be installed near the control target. Required. However, when the PC is installed in the vicinity of the controlled object, when operating the controlled object or monitoring the state of the controlled object, all the operations and monitoring are performed via the PC, so that the PC is used each time. I have to go to the installation site. Therefore, the POD is used as a device for transmitting an operation signal to the PC and transmitting and displaying information of a control target held in the PC even from a place away from the installation place of the PC.

In FIG. 4, PD is POD, and POD is
PD is connected to PCA1 by signal line SL. Signal line SL is P
It is a signal line for transmitting a signal to be communicated between ODPD and PCA1. Since communication between PODPD and PCA1 uses a standard serial transmission system, a signal line between PCA1 and plant PL is used. The number of signal lines SL may be extremely small compared to the number. As shown in the figure, the PODPD is the operating switch OSi.
(I is the number of a plurality of operation switches OS, a number representing one of them), and a display screen DS. The operation switch OSi has a switch for generating an operation signal to each part constituting the plant PL via the PCA1, for example, a signal for starting and stopping the motor M, data for updating the set value of the temperature, and the like, which the PCA1 has. Data, for example, a switch that gives a command to PCA1 to transmit the temperature of the liquid LQ.

When using the PODPD, for example, to display the temperature of the liquid LQ, when one of the operation switches OSi for instructing the display is pressed, the display command signal of the temperature of the liquid LQ becomes PCA1. P that received this signal
CA1 transmits the data of the temperature of the liquid LQ to PODPD, and PODPD having received this data displays this data according to the display format indicated by the standard display data stored in advance.

FIG. 5 is a block diagram showing the inside of the PODPD shown in FIG. As shown in the figure, the PODPD is a display unit having a control calculation unit 1, a program storage unit 2, a screen data storage unit 21, a data storage unit 3, an input unit 4 which is an input unit, and a display screen DS shown in FIG. First input / output unit 6, which is a circuit for inputting and outputting a signal for communicating with PCA1 (see FIG. 4) via the unit 5 and the signal line SL, POD
The second input / output unit 7 is a circuit for inputting / outputting a signal for communicating with a screen creating device (not shown) for creating a PD program. The control calculation means 1 executes the program stored in the program storage means 2 or the graphic data storage means 21 to realize the function of PODPD. In the following description, it is assumed that the functions realized by the control calculation means 1 executing the program are realized by the program.

A signal from the operation switch OSi of the input section is input to the program storage means 2 to generate a code corresponding to this switch, or input / output from the first input / output section 6 or the second input / output section 7. A basic program P0 for performing basic operations of the PODPD such as controlling a signal to be controlled and displaying data in the screen area D0 of the data storage means 3 on the display unit 5 is stored. The screen data storage means 21 is a read-only storage medium whose stored contents can be rewritten, for example, a RAM having a guaranteed power supply in the event of a power failure or an area having a flash memory as the storage medium. , Screen data DD consisting of a display program DP, which is a program that makes the display contents special contents according to the controlled object, and standard display data DSD, which is fixed data that defines the display format referred to by the display program DP. Is stored. The data storage means 3 includes a screen area D0 composed of data corresponding to each pixel constituting the display screen of the display unit 5 and a storage area for storing dynamic data for determining the contents of the screen area D0. A screen information area D1 and an area such as a work area D2 which is a data area dynamically used by the control calculation means 1 to execute a program are provided.

FIG. 6 is a display screen of the POD PD shown in FIG.
It is the figure which showed an example of the screen on DS. This screen is shown in Figure 4.
The case where the temperature of the liquid LQ of the plant PL shown in is displayed is shown. When a signal is sent from PODPD to PCA1 to transmit the liquid LQ data, PCA1 determines the current value of the temperature, which is dynamic data, and the liquid LQ generated in the past, as data related to the temperature of the liquid LQ held by PCA1. It returns the minimum and maximum temperatures, and the lower and upper limits that are allowed for the liquid LQ temperature. Upon receiving these data, PODPD fills the undecided data in this format with the data received from PCA1 according to the display format for the temperature display of liquid LQ stored as standard display data DSD of PODPD in advance, and completes. The displayed data is stored in the screen information area D1. The contents stored in the screen information area D1 are
The basic program P0 converts the data into the screen area D0, and the converted data is converted into P by the basic program P0.
It is displayed on the display unit 5 (see FIG. 5) of the ODPD. As shown in FIG. 6, the liquid LQ temperature display format displays the current value of the temperature as a numerical value, for example, 50.0 (the degree of the unit is omitted), and the data related to the current value of the liquid LQ. For example, the minimum value of the temperature that has occurred in the past is displayed as 49.5, the maximum value is displayed as 50.6, and the lower limit value of the temperature allowed for the temperature of the liquid LQ is displayed as 49 and the upper limit value is displayed as 51. Of the displayed contents, the scale of the indicating instrument style and the characters that represent the data items are fixed display data, and are stored as standard display data DSD in the area of screen data DD.

FIG. 7 shows the same contents as the liquid temperature display shown in FIG. 6 as a display screen DS of the PODPD shown in FIG. 4 as a level style display screen PT2 different from the indicating instrument style screen PT1. It is the figure which showed the case where it was displayed on DS. On the level style display screen PT2,
It is assumed that the temperature is at a high level, and the lower limit value, upper limit value, minimum value, and maximum value of the temperature are displayed in a vertical positional relationship on the screen corresponding to the size, and the current location is indicated by "PV" in a circle. It is displayed at the position of the displayed line.

FIG. 8 shows, as an example of a display screen created by the screen data DD, the indicating instrument style screen PT shown in FIG.
The same screen as 1 (abbreviated as screen PT1 in the following description)
The screen data DD that creates PT1 will be described. As the display program DP, which is the contents of the screen data DD, the indicating instrument style program is stored in the screen data storage means 21, and as the standard display data DSD, the fixed data referred to by the indicating instrument style program is stored in the screen data storage means 21. Therefore, the function based on the screen data DD becomes the function of displaying the indicating instrument display style.

The screen PT1 uses a part of the screen made up of a set of pixels constituting the display screen DS. In the figure,
X0 to Xm-1 are coordinate axes that represent the coordinates of pixels on the screen DS in the horizontal axis direction, and Y0 to Yl are coordinate axes that represent the coordinates in the vertical axis direction. Pixels are present at the intersections of the coordinate axes X0 to Xm-1 and the coordinate axes Y0 to Yl. Each pixel is a screen area D0
Data corresponding to a data area consisting of a plurality of bits at one address (see FIG. 5) and representing the density of a pixel is stored in the data area corresponding to each pixel. Pointer PT
The coordinates of the pixel representing the tip of the pointer are (Xi, Yj), and the coordinates of the pixel representing the base of the pointer PT are (Yk, Yl).

The coordinates of the pixel and the address of the area for storing the data corresponding to the pixel of the screen area correspond as described below. If the address of the data area corresponding to the pixel at coordinates X0 and Y0 is A0, the address of the rightmost pixel on the Y0 axis is (A0 +
(m-1)), and the address of the data area corresponding to the pixel of coordinates X0, Y1 is (A0 + m), and the addresses of the pixels in the same column of one pixel are the same in the previous row. It is the address obtained by adding "m" to the address of the data corresponding to the pixel in the column. Therefore, the address of the pixel at the coordinate (Xi, Xj), which is the tip of the pointer PT, is (A0 + m *
j + i) (where * is a multiplication code), and the address of the pixel at the coordinates (Xk, Yl) at the base of the pointer PT is (A0 + m * l + k). The coordinates of the pixels forming the pointer PT can be obtained from the equation of a straight line connecting the coordinates of the tip and the base of the pointer PT. When displaying the pointer PT, the coordinates (Xk, Xl) at the base of the pointer PT are the coordinates given as a fixed point, so the display program DP is PCA1.
From the current value received from the coordinates (Xi, Y
j) is defined, and after that, the area of the data corresponding to the pixel displaying the pointer PT is determined by the program that performs the processing in accordance with the expression indicating the pointer PT, and the data indicating the density of the pointer PT is stored in the determined area. . Since the data indicating the shape of the pointer and the density of the pointer are fixed data, they are stored as standard display data DSD, and are referred to in the process of processing the display program DP. The fixed characters indicating the data items such as the current value and the minimum value and the display position of the characters are stored in the screen display means 21 in advance as the standard display data DSD like the fixed data for the pointer, so the display to be displayed If the dynamic data such as the current value is confirmed, the display program DP
Completes the screen information by supplementing the standard display data DSD with the determined dynamic data and stores it in the screen information area D1. The contents of the screen information area D1 are converted as the data of the screen area D0, and the converted data is displayed as a figure.

Since POD is applied to various objects, it is necessary to support a plurality of display modes. POD programs for all display formats to support multiple display formats
However, this method is not suitable for a POD that requires a small size and low price. Therefore, in the POD, the display program of any one display method and the standard display data referred to by this program are displayed in the display program DP and the standard display data DSD.
When changing to another display method, it is replaced with another screen data by an operation from the program creating device.

FIG. 9 shows an explanatory diagram for updating the screen data DD shown in FIG. In the figure, PD is the same POD as the same POD as shown in FIG. 5, and MC is a personal computer that is a screen creation device equipped with a screen creation program for creating screen data DD. When changing the display form of PODPD to another display form, for example, the level form display shown in FIG. 7, the screen forming device MC creates the level form display program as the display program DP and refers to the level form display program. Prepared fixed data as standard display data DSD. The screen creation device MC is connected to the PO via the standard signal line.
First, the display program DP is connected to the second input / output unit 7 (see FIG. 5) of the DPD and operated by the screen creating device MC.
The area (see FIG. 5) is erased. Next, the screen data DD including the already created display program DP and standard display data DSD is sequentially transmitted to the POD via the signal line SL. The POD sequentially stores the received screen data DD in a predetermined area of the screen data storage means.

As described above, in order to update the display format, it is necessary to update the screen data, but it is rare to create new screen data, and if a part of the existing screen data is changed. Often sufficient. For example, FIG.
For example, when changing the thickness of the pointer of the indicating instrument display format PT1 shown in and changing the radius of the scale. Therefore, in general, save the screen data for POD,
It is widely practiced to reuse existing screen data when modifying the display content of the POD.

[0016]

As described above, when changing the display format in the conventional POD, the screen data after the change is prepared by the screen creating device, and the screen data is sent to the POD via the signal line. Send and in POD,
A method of replacing existing screen data with transmitted screen data is used. When preparing screen data after change, existing screen data is often reused, so it is desirable to save existing screen data systematically so that it can be searched easily. The contents displayed by POD are extremely diverse, and the places in which they are used are enormous, so display programs that can be systematically stored and managed are limited to basic patterns. There was no choice but to rely on the screen data stored by the screen creation device that developed the screen data for POD. Therefore, it cannot be said that the screen data is always saved.

In view of the above-mentioned circumstances, the present invention makes it possible to easily use the screen data held by the operation display device in the screen creating apparatus, and to use the individually developed screen data in the screen creating apparatus. It is an object of the present invention to provide an operation display device in which necessary screen data can be surely and easily obtained without saving.

[0018]

In order to achieve the above-mentioned object, in the present invention, control calculation means, program storage means for storing a program executed by the control calculation means, and screen data for storing screen data. The storage device includes a storage device, a data storage device, an input device, and a display device. The screen data includes standard display data and a display program, and the standard display data defines a format for displaying a graphic on the display device. It is fixed data, and the display program is
In the operation display unit, which is a program that displays dynamic data on the display unit according to the format indicated by the standard data, the input unit that has the function of communicating with the screen generation unit that has the function of generating the screen data for the operation display unit. A program for transmitting screen data having an output section is stored in the program storage means, and the control operation means executes the screen transmission program in response to a signal from the input section to create screen data via the input / output section. It is characterized by transmitting to the device.

Therefore, when the operation display device of the present invention receives a signal indicating that the screen data should be transmitted from the input section to the external screen creation device, it activates the screen data transfer program and causes the screen data storage means to execute the operation. The screen data is sequentially read, and the read screen data is transmitted to the screen creation device via the input / output unit. Further, in the present invention, it is preferable that the screen data storage means is a read-only storage means in which the stored contents can be rewritten, that is, a flash memory or a RAM in which a power source is secured in the event of a power failure. That is, when modifying the screen data stored in the operation display unit, the screen data stored therein is transmitted to an external screen creation device, and the screen data received by the screen creation device that received this screen data Modify the target screen data,
The modified screen data is transmitted from the screen creating device to the operation display unit and stored in the graphic data storage means of the operation display unit.

Furthermore, the input / output unit is a circuit having a function of communicating with other operation display devices, and it is assumed that screen data is transmitted to another operation display device via the input / output unit by a signal from the input unit. It is suitable. That is, according to the operation display device of the present invention, it is possible to transmit the screen data held by the operation display device to another operation display device and display the transmitted screen data on the other operation display device.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an explanatory view of a POD PDA which is an example of an embodiment of the present invention. 1 (a) is a block diagram showing the inside of the operation display PDA.
(b) is a diagram showing a relationship between the operation display device PDA and a screen creation device MC having a function of creating a display program for the operation display device PDA.

As shown in FIG. 1 (a), the PODPDA includes a control calculation unit 1, a program storage unit 2A, a screen data storage unit 21, a data storage unit 3, an input unit 4, a display unit 5, and a first unit.
The input / output unit 6, the second input / output unit 7, and the third input / output unit 7 are included. Among these elements constituting the PODPDA, those denoted by the same reference numerals as those of the PODPD shown in FIG. 5 have the same functions as those of the PODPD, and therefore the description thereof will be omitted. The program storage means 2A stores a basic program PO and a screen data transmission program P2, and the program storage means 2A is the POD shown in FIG.
Program storage means 2 of PD and screen data transmission program
The program storage means has the same function as the program storage means 2 shown in FIG. 5 except that P2 is stored. The screen data storage means 21 stores the screen data DD
Is stored. The screen data DD has the same structure as the screen data DD shown in FIG. 5, which includes the display program DD and the standard display data DSD.

When a signal for transmitting the screen data DD from the input unit 4 to a screen creating device (not shown) is input, this signal is processed by the basic program P0, and the basic program P0 is processed.
P0 starts the screen data transfer program P2. The screen data transfer program P2 reads the screen data DD word by word and stores the read command or data for one word in the register IR which is a temporary storage area of the second input / output unit 7.
The second input / output 7 converts the content stored in the register IR into a signal suitable for the transmission of the signal line SL, and transmits it as a serial signal according to the standard rule to the screen creating device. When a signal for updating the screen data DD is input from the input unit 4, this signal is processed by the basic program P0, and the basic program P0 sets the second input / output unit 7 to a state in which a signal from the outside can be received. To do. When data or a program is received from an external device, for example, a screen creating device, the received content is temporarily stored in the register IR of the second input / output unit, and when the stored received content reaches a predetermined capacity, the basic program is stored. It is read to P0 and stored in the work area D2. When the reception from the external device is completed, the program or data stored in the work area D2 is inspected by the basic program PO, and if no abnormality is found as a result of the inspection, this program or data is inspected by the basic program P0. The new screen data DD is stored in the storage means 21.
If the old screen data remains in the screen data storage area 21, the basic program P0 erases the contents before storing the new screen data. Also,
If the storage medium forming the screen data storage means 21 is a storage medium of a format that cannot be rewritten, the screen data DD
Is used as read-only data without being updated.

In FIG. 1B, PDA is the same POD as PODPDA shown in FIG. 1A, and MC is PODPD.
It is a personal computer as a screen creation device having a function of creating graphic data DD for A. PODPDA
And the screen creation device MC are connected by the signal line SLS, and the screen creation device MC is in the reception state, the screen data transmission start switch SW1 (in the following description, the switch SW1 and the switch SW1 (Abbreviated) is operated to close the circuit, the basic program P0 (see (a) in FIG. 1) that has input the signal indicating the closed circuit from this switch starts the screen data transmission program P2, and the PODPDA process is executed by this program. Transmits the graphic data DD to the screen creating device MC via the signal line SLS in accordance with the standard serial transmission system.

FIG. 2 is an explanatory diagram showing a case where graphic data is transmitted from one POD indicator PDA1 to the other POD PDA2. In the figure, both PODPDA1 and PODPDA2 have the same functions as the PODPDA shown in FIG. PO
When transmitting the graphic data DD (see (a) in FIG. 1) from DPDA1 to PODPDA2, the signal line is transmitted via the second input / output unit 7 (see (a) in FIG. 1) of each of PODPDA1 and PODPDA2. Connect with SLS and set P on POD PDA2 on the receiving side.
A signal for setting the second input / output circuit 7 of the ODPDA2 to the receiving state is input from the screen data reception start switch SW2 (abbreviated as switch SW2 in the following description). The basic program P0 of the POD PDA2 (Fig. 1) that receives the signal of the switch SW2
(See (a)) puts the second input / output circuit 7 into a receiving state.
In this state, when the switch SW1 of the ODPDA1 on the transmission side is operated, the screen data transmission program P2 (see (a) in FIG. 1) is started as described above, and the standard data is transmitted via the signal line SLS. The graphic data DD is transmitted from the POD PDA1 according to the serial signal transmission method of P, and the transmitted graphic data DD is P
It is received by ODPDA2.

FIG. 3 is a flow chart showing the operation of the PODPDA shown in FIG. 1 for transmitting and receiving screen data.
As shown in the figure, in process F1, PODPDA proceeds to process F2 when it receives a signal for requesting transmission / reception of screen data, which is transmitted by closing switch SW1 or switch SW2 shown in FIG. Determine whether it is due to the closing of SW1. If the switch SW1 is closed, the process proceeds to step F3 to start transmitting screen data. When the end of the transmission is confirmed in the process F4, the transmission process of the screen data ends. If it is determined in the process F2 that the transmission switch is not closed, the process proceeds to a process F5, the POD PD is set to the screen data receivable state, the transmitted screen data is sequentially received, and the process F6 completes the reception. If confirmed, the reception process ends.

[0027]

As described above, the operation display device of the present invention includes the control calculation means, the program storage means for storing the program executed by the control calculation means, and the screen data storage means for storing the screen data. , A data storage means, an input device, and a display device, the screen data consists of standard display data and a display program, and the standard display data is fixed data that defines the format for displaying graphics on the display device. The display program is a program that displays dynamic data on a display device according to the format indicated by standard data.In the operation display device, a screen creating device having a function of creating screen data for the operation display device is used. It has an input / output unit having a function of communicating, a program for transmitting screen data is stored in the program storage means, and a program from the input unit is used for receiving the program. , And transmits to the screen generating apparatus via the input-output unit the screen data by the control operation unit screen transmission program executes.

Therefore, in the screen creating apparatus, when new screen data is created or the screen data is modified by referring to the screen data having the same contents as the screen data stored in the operation display unit, The screen data that is the same as the screen data stored in the operation display unit as in the past is stored, and the screen stored in the operation display unit does not need to be referenced or modified even if the stored screen data is referenced. Since it is sufficient to send data and use the sent screen data for reference and modification, there is no management problem of storing a huge amount of individual screen data, and it is absolutely necessary. Screen data to be obtained.

In the operation display device according to the second aspect of the present invention, the screen data storage means is a read-only storage means capable of rewriting the stored contents, such as a flash memory or a power failure. RAM with secured power
Therefore, the screen creation device is made to send the screen data from the operation display unit, and the screen data updated based on the sent screen data or the newly created screen data is sent via the communication line. , The screen data held by the operation display can be updated.

Further, in the operation display device of the present invention according to claim 3, the input / output unit is a circuit having a function of communicating with another operation display device, and the screen data is input / output by a signal from the input unit. To other operation indicators via the unit. That is, according to the operation display device of the present invention, screen data can be transmitted and received between the operation display devices and the screen data held by the other operation display devices can be displayed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an operation display device which is an example of an embodiment of the invention described in claim 1, (a) is a block diagram showing the inside of the operation display device, and (b) is an operation display device. Diagram showing the connection relationship between the display unit and the screen data creation device for the operation display unit

FIG. 2 is a diagram showing a connection relationship when screen data is transmitted from an operation display unit having the same function as the operation display unit shown in FIG. 2 to the other operation display unit.

FIG. 3 is a flowchart showing an operation of transmitting and receiving screen data of the operation display unit shown in FIG.

FIG. 4 is a diagram showing an example of a conventional operation indicator and a system to which the operation indicator is applied.

5 is a block diagram showing the inside of the operation display shown in FIG.

FIG. 6 is a diagram showing an example of a screen displayed on the display screen of the operation display unit.

FIG. 7 is a diagram showing another example of the screen displayed on the display screen of the operation display unit.

FIG. 8 is an explanatory diagram showing an example of creating a display screen by giving dynamic data to screen data.

FIG. 9 is a diagram showing a connection relationship when screen data is transmitted from the screen creation device to the operation display unit.

[Explanation of symbols]

 PDA operation display 1 control calculation means 2A program storage means P0 basic program P2 screen data transmission program 21 screen data storage means DD screen data 3 data storage means 4 input section 5 display section 6 first input / output section 7 second input / output section SW1 Screen data transmission start switch MC screen creation device

Claims (3)

[Claims] 1. A control calculation means, a program storage means for storing a program executed by the control calculation means, a screen data storage means for storing screen data, a data storage means, an input device, and a display device. The screen data includes standard display data and a display program, the standard display data is fixed data that defines a format for displaying a graphic on the display device, and the display program is dynamic data. Is a program for displaying on the display device according to the format indicated by the standard data, in the operation display device, an input device having a function of communicating with a screen creation device having a function of creating screen data for the operation display device. A program that has an output section and transmits screen data is stored in the program storage means, and the image is transmitted by a signal from the input section. An operation display device characterized by transmitting screen data to the screen creation device via the input / output unit by the control calculation means executing a surface transmission program. 2. The operation display device according to claim 1, wherein the screen data storage means is a read-only storage means of a format in which the stored contents can be rewritten, and a flash memory or a power source during a power failure is secured. An operation display characterized by being a RAM. 3. The operation display device according to claim 1 or 2, wherein the input / output unit is a circuit having a function of communicating with another operation display device, and the screen data is generated by a signal from the input unit. Is transmitted to the other operation display device via the input / output unit.