JPH10105211A - Method for processing data received by programmable display device with control function according to kind of the same data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide the kind of communication data without changing communication protocol. SOLUTION: The programmable display device 1 is connected to an external controlled system and controls it to display the state of the controlled system. A procedure which processes communication data received from a support device 7 which supports a display function or control function decides whether the communication data are for display or control first according to a connection check command received from the support device 7 and processes the received communication data according to the decided kind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable display device which is connected to an external control object and has a function of controlling the same, wherein communication data received from a support device supporting the display function or the control function is displayed. The present invention relates to a method of determining which type of communication data is used for communication or control, and processing received communication data based on the determined type.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A system is connected to (9) for displaying the operating state of the system on a screen and controlling a control target. The system includes a programmable display device (10) having a display function and a programmable control device (11) having a control function, and the two devices (10) and (11) are connected to each other by a communication cable (82). ing. Programmable display device (1
0) is a display device (2
0), an operation device (21) composed of a transparent touch panel or the like pasted on the screen of the display device (20), a control circuit (40) composed of a microcomputer or the like, and a display control memory. (50). Further, the programmable display device (10) has a communication I / F for communicating with the outside.
(Interface) (60) (62) is provided. One communication I / F (60) is connected to a display support device (70) via a cable (80). The display support device (70) creates image data to be displayed on the display device (20), transmits and receives the image data to and from the display control memory (50), or in the programmable display device (10). Various system programs are transmitted to the display control memory (50). Transmission and reception of various data or programs between the display support device (70) and the programmable display device (10) are performed based on a predetermined communication protocol.

On the other hand, a programmable controller (11) is generally called a sequencer or a PLC (programmable logic controller), and includes a control circuit (41) composed of a microcomputer or the like and an I / O (input / output) control. It comprises a memory (51) and an I / O unit (3) connected to the control target (9). Also, the programmable controller (11)
Includes communication I / Fs (61) and (62) for communicating with the outside. One communication I / F (61) is connected to a control support device (71) via a cable (81). The control support device (71) creates a control program for operating the control function, and stores the control program in an I / O control memory.
(51), various system programs in the programmable controller (11) are stored in the I / O control memory (5).
1) or monitor or debug the control program. Transmission and reception of various programs and the like between the control support device (71) and the programmable control device (11) are performed based on a predetermined communication protocol. In the following, various data and programs transmitted and received are referred to as communication data. Communication I for programmable display device (10)
/ F (62) and the communication I / O of the programmable controller (11).
By connecting the F (62) with the cable (82), the programmable display device (10) and the programmable control device (11)
Are connected to each other.

The programmable display device (10) generates input data by operating the operation device (21), and transmits the input data to the programmable control device (11). The programmable controller (11) executes a control program based on the received input data, and
The operation of (9) is controlled. Accordingly, the operation of the control target (9) is changed by the operation of the operation device (21). In addition, the programmable controller (11)
A signal indicating the state of (9) is received from the control target (9), and state data is created and transmitted to the programmable display device (10). The programmable display device (10) displays on the display device (20) based on the transmitted status data. Therefore,
The operation state of the control target (9) is displayed on the display device (20).

[0005]

SUMMARY OF THE INVENTION In order to reduce the size of the entire apparatus and to speed up data processing, the applicant of the present application has proposed a programmable display apparatus having a programmable control device as shown in FIG. (1) was developed. Along with this, in order to facilitate maintenance and reduce the number of parts, the communication I / F and the cable connector for transmitting and receiving with the display support device or the control support device are each one, and the communication I / F is provided. It is required that the F (6), the cable connector (83) and the cable (8) be shared between transmission / reception with the display support device and transmission / reception with the control support device. However,
The communication data transmitted / received for the conventional programmable display device (10) and the communication data transmitted / received for the programmable control device (11) have different data contents, storage locations in a memory, and the like. Therefore, the programmable display device (1)
It is necessary to determine whether the received communication data is for display or control, and to perform a process corresponding to the determination.
In addition, in order to maintain compatibility with the conventional programmable display device (10), it is also required that the specification of the communication protocol used in the conventional programmable display device (10) is not changed.

[0006]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, the present inventor has focused on a line connection check performed at an initial stage of a transmission control procedure and has devised the following solution. When performing communication, first, the connection of the line is checked to confirm that the connection is normal. If the connection check command used at this time is changed for display and control, it can be determined whether the communication data is for display or control. The present invention, in a programmable display device having a control function, without changing the conventional communication protocol, by determining the type of data received from the display or control support device, based on the determined type, It is an object to provide a method for processing received communication data.

[0007]

According to the present invention, a connection check command received from a support device determines which type of communication data is for display or control, and based on the determined type, the received data is received. Processing of communication data to be performed.

[0008]

According to the above-mentioned method, the type of communication data can be determined without changing the specification of the communication protocol by the connection check command received from the support device, and the communication data received thereafter becomes the determined type. It can be appropriately processed based on the information. The communication I
/ F, only one cable connector and one cable, and two types of communication data for display and control can be transmitted and received, so maintenance is easier than before,
In addition, the number of parts can be reduced.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. The present invention relates to a programmable display device (1) having a control function as shown in FIGS.
Used in The programmable display device (1) has an I / O unit (3) connected to the device main body (2), and is connected to a control target (9) via the I / O unit (3). The apparatus main body (2) includes a display device (20) composed of an LCD,
An operation device (21) composed of a transparent touch panel attached to the screen of the display device (20), and a display device
(20) and an operation device (21), a control circuit (4) composed of a microcomputer, a display control memory (50) and an I / O control memory (50) connected to the control circuit (4). 51), a communication I / F (6) connected to the control circuit (4) for communicating with the outside, and a cable connector (83) connected to the communication I / F (6). . The control circuit (4)
Connected to I / O unit (3). Cable connector (8
3) is connected to a support device (7) constituted by a personal computer via a cable (8).

The support device (7) has a function of supporting both the conventional display support device (70) and the control support device (71). That is, the support device (7) creates display data such as image data to be displayed on the display device (20) as a display support function, and exchanges the display data with the display control memory (50). It performs transmission and reception, and transmits a display system program in the programmable display device (1) to the display control memory (50). Further, the support device (7) has a control support function,
It creates a control program for operating the control function, transmits and receives the control program to and from the I / O control memory (51), and adds a control function to the programmable display device (1). Control system program I
It transmits to the / O control memory (51) and monitors and debugs the control program and the control system program.

The programmable display device (1) first stores the display system program and display data received from the support device (7) in the display control memory (50), and receives the display system program and display data from the support device (7). The control system program and the control program obtained from the I / O control memory
Store it in (51). Then, the control circuit (4) executes the control program based on the operation of the operation device (21),
The operation of the control target (9) is controlled via the I / O unit (3). Further, the control circuit (4) receives a signal indicating the state of the control target (9) from the control target (9) via the I / O unit (3), and based on the state signal, controls the display control memory ( 50)
Read necessary display data from the display device (20)
To be displayed.

Communication data transmitted and received between the programmable display device (1) and the support device (7) are two types of communication data for display and control.
Data contents, storage locations in memory, etc. are different. Therefore, the type of communication data is determined using the connection check command, and processing corresponding to the type is performed. The connection check command is a command transmitted from the support device (7) to the programmable display device (1) in order to check whether or not the connection is normal before actual data is transmitted / received. The connection check command is several bytes of data, and its value differs depending on the communication protocol.
Upon receiving the connection check command from the support device (7), the programmable display device (1) sends a response indicating normal or abnormal to the support device (7). In the present embodiment, in order to maintain compatibility with the conventional programmable display device (10), the support device (7) and the programmable display device (1)
As a communication protocol for transmitting and receiving communication data between them, a communication protocol of a conventional programmable display device (10) (FIG. 4) is used. Further, in the conventional programmable display device (10), there are two types of a setting mode and an execution mode. When transmitting and receiving communication data for display, the mode is shifted to the setting mode and the programmable display device (10) is executed. At that time, it was shifted to the execution mode. Also in the programmable display device (1) in the present embodiment, when transmitting and receiving communication data for display, the mode is shifted to the setting mode.
On the other hand, when transmitting and receiving control communication data, monitoring and debugging may be performed with the programmable display device (1) in the execution state.

FIG. 3 shows a procedure for determining a communication protocol of data transmitted and received by the programmable display device (1) in the present embodiment. Each processing such as display processing and control processing in the programmable display device (1) is executed by multi-programming, and a program of a procedure for this determination is also executed as one of the multi-programming. That is, the procedure for this determination always operates while the programmable display device (1) is operating, and waits for data reception (S1). At this time, if data has been received, the current mode is checked (S2). If it is not the setting mode, it is checked whether a connection check command is included in the received communication data (S3). Since this communication data is known to be control communication data, the control processing is performed on the received communication data (S4). On the other hand, if the connection check command is included in S3, this communication data
Since it is determined that the communication data is display communication data, the mode is changed from the execution mode to the setting mode (S5), and display processing is performed on the received communication data (S6). Further, in the setting mode in S2, it can be understood that the communication data for display is transmitted and received. At this time, it is checked whether the reset command is included in the received communication data (S7). If the reset command is not included, a process for displaying is performed on the received communication data (S6). If so, the mode is changed from the setting mode to the execution mode (S8). After execution of the control process (S4), execution of the display process (S6), or change to the execution mode (S8), the process returns to S1 and waits for data reception (S1).

At this time, if the communication data received by the programmable display device (1) is display communication data, the programmable display device (1) first receives communication data including a connection check command. Then, the mode is shifted to the setting mode and a response is made to the support device (7). afterwards,
The programmable display device (1) decodes the received communication data for display, and based on the decoding, the support device (7)
And processing for transmitting and receiving display data to and from the display control memory (50). When a series of processes is completed, communication data including a reset command is transmitted from the support device (7), and the programmable display device (1) shifts to an execution mode and performs an execution operation.

If the communication data received by the programmable display device (1) is communication data for control,
Since the communication data transmitted first does not include the connection check command, the programmable display device (1) decodes the received communication data for control in the execution mode. Transmitting and receiving a control program with the support device (7) based on the decryption, storing the control system program in the I / O control memory (51), a control program and a control system program , Monitor, debug, etc.

By following the above procedure, the type of communication data can be determined by the connection check command received from the support device (7) without changing the specification of the communication protocol, and the communication data received thereafter is determined. It can be appropriately processed based on the type. Further, since only one communication I / F, one cable connector, and one cable can be used to transmit and receive two types of communication data for display and control, maintenance is easier and the number of parts is reduced as compared with the related art. be able to. In this embodiment, when transmitting and receiving communication data for display,
Programmable display device to move to setting mode
If (1) is the setting mode, display processing can be executed without going through step (S3) for determining the type of communication data.

The description of the above embodiments is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. or,
The configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims. For example, in the present embodiment, the support device (7) has both the display support function and the control support function. It can also be used separately after being divided into devices (71). Further, in FIG. 1, the display control memory (50) and the I / O control memory (51) are described separately, but they can be allocated to different storage areas in one memory. Even in this case, there is no difference that the data storage positions are different for display and control.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a programmable display device having a control function in which the present invention is used and peripheral devices thereof.

FIG. 2 is a perspective view showing a programmable display device having a control function in which the present invention is used, a support device, and a cable connecting the both.

FIG. 3 is a flowchart illustrating a procedure for executing processing of the communication data based on a type of data received by the programmable display device according to the embodiment.

FIG. 4 is a block diagram showing a conventional programmable display device and a conventional programmable control device.

[Explanation of symbols]

 (1) Programmable display device having control function (4) Control circuit (6) Communication I / F (7) Support device (8) Cable (50) Display control memory (51) I / O control memory

Claims (1)

[Claims] 1. A display device (20) for displaying a state of a control target (9), an operation device (21) for inputting a command to the control target (9), and a display device based on an input from the operation device (21). A control circuit for controlling the operation of the control target (9) by executing a control program, and receiving a status signal from the control target (9) and displaying the status signal on the display device (20) based on the status signal ( 4), a communication interface (6) connected via a cable (8) to a support device (7) for supporting a display function or a control function, and a display control for storing display data and a display system program. A programmable display device (1) having a control function, comprising a memory (50) and an input / output control memory (51) for storing a control program and a control system program, comprising: Connection check command received By determining which type of communication data for display or control, based on the determined type, including a step of processing the received communication data, based on the type of received data A method for performing processing of the data.