JPH10105212A - Display control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display control system wherein a programmable controller only refers to its own device memory when controlling a controlled system connected to the programmable display device through an I/O unit as to a system constituted by connecting a programmable controller and a programmable display device to each other. SOLUTION: The programmable controller 12 is equipped with an I/O unit 9 which is connected to the controlled system, a control circuit 8 which generates control data to the controlled system, and the device memory 10 which is connected to the control circuit 8. The programmable display device 1 is equipped with a control circuit 3 which controls the display operation of a display unit 3 and controls the input and output of data to and from the controlled system and a control memory 7 which is connected to the control circuit 3. Then the programmable display device 1 writes the data of the control memory 7 periodically in the device memory 10 of the programmable controller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a display function for displaying the operating state of a controlled object with each device constituting a plant of a chemical factory or a production line of a machine factory being controlled, and an operator's operation. The present invention relates to a programmable display device having a control function of controlling the operation of a control target according to a command, and more particularly to a display control system configured by connecting the programmable display device to a programmable control device such as a sequencer.

[0002]

2. Description of the Related Art Conventionally, as a display control system for displaying an operation state of a control target and controlling the control target, as shown in FIG. 5, a programmable display device (11) mainly having a display function is mainly provided. There is known a system in which a programmable control device (12) having a control function is connected to each other by a communication cable (13). The programmable display device (11) includes a display (4) composed of a liquid crystal display or the like, a transparent touch input type operation panel (5) attached to a screen of the display (4), a microcomputer or the like. And a memory (15) for display control. On the other hand, the programmable control device (12) is generally called a sequencer or a programmable logic controller (PLC), and is constituted by a microcomputer or the like and is connected to the programmable display device (11) via a communication cable (13). It has a circuit (16), an input / output control memory (17), and an I / O unit (18) having input / output terminals. (19) is connected.
The control circuit (16) of the programmable control device (12) operates according to a user program created in advance using, for example, a ladder language, and exhibits a predetermined control function.

The data input by operating the operation panel (5) of the programmable display device (11) is supplied to a programmable control device (12) via a communication cable (13), and the programmable control device (12) is correspondingly supplied thereto. The control circuit (16) of (12) creates control data, and the control data is I / O
Output to the control target (19) via the unit (18). As a result, the operation of the control target (19) is controlled.
The state data obtained from the control target (19) is transmitted to the programmable display device (11) through the programmable control device (12).
Input to the control circuit (14), and the control circuit (14)
Creates display control data, and the display control data is
It is supplied to (4). Thus, the operation state of the control target (19) is displayed on the display (4).

[0004]

However, the conventional programmable display device (11) is a programmable control device.
Since the display function and the control function are exhibited in combination with (12), the programmable controller (12) is indispensable even when controlling a single or a small number of control objects, for example, and the entire apparatus is required. There was a problem that was massive.
Further, since communication is performed between the control circuit (14) of the programmable display device (11) and the control circuit (16) of the programmable control device (12) via the communication cable (13), time is required for data processing. There was such a problem.

In view of the above, the applicant has proposed a programmable display device having both a display function and a control function and achieving high-speed data processing (Japanese Patent Application No. 8-232007).
FIG. 1 shows a display control system according to the present invention which is configured by connecting a programmable display device (1) and a programmable control device (12). Has basically the same configuration as the programmable display device (1) shown in FIG.

[0006] As shown in the figure, an I / O unit (2) is connected to the programmable display device (1).
It is possible to connect the control object (19b) to (2). .
Further, similarly to the conventional programmable display device, it is also possible to connect a programmable control device (12) via a communication cable (13) and connect a control target (19a) to the programmable control device (12). .

The programmable display device (1) comprises a display (4) constituted by a liquid crystal display, and the display (4).
Touch input type operation panel attached to the screen of (4) (5)
And a control circuit composed of a microcomputer
(3), an internal memory (6) and a control memory (7) connected to the control circuit (3), and the control circuit (3) includes:
A plurality of tasks such as a communication task, a display task, a touch input task, and a control task are registered. In the programmable display device (1), a control task is additionally registered in the control circuit (3), and the control circuit
The characteristic configuration that the control memory (7) is additionally connected to (3) and the point that the I / O unit (2) is contact-connected without passing through a communication cable is a feature that is not present in the conventional programmable display device. It is.

The programmable controller (12) comprises a control circuit (8), an I / O unit (9) and a device memory (10).
It has a general configuration consisting of

In the programmable display device (1), the function of the control circuit (16) constituting the conventional programmable controller (12) is realized by the control task of the control circuit (3), Since the function of the I / O unit (18) constituting the device (12) is realized by the I / O unit (2) connected to the control circuit (3), the conventional programmable controller (12) is unnecessary. This reduces the overall size of the device. Further, since the programmable display device (1) and the I / O unit (2) are directly contact-connected without a communication cable, data processing is performed at high speed.

[0010]

As shown in FIG. 1, a programmable control device (12) is connected to a programmable display device (1) via a communication cable (13), and a plurality of control objects (19a) (19b) are connected. ) Is controlled, the device memory (10) of the programmable controller (12) stores state data from the control target (19a) connected to the I / O unit (9) and the control target (19a). While the control data of
Control memory of programmable display device (1) (7)
The control target (19b) connected to the I / O unit (2)
And the control data to the control target (19b) are stored, and the data stored in the device memory (10) and the data stored in the control memory (7) are completely different.

However, a programmable display device
Control target connected to (1) via I / O unit (2)
Programmable controller according to the state data of (19b)
When the control target (19a) connected to (12) is controlled by the programmable control device (12), the programmable control device (12) directly reads the contents of the control memory (7) of the programmable display device (1). Since they cannot be referred to, communication via the communication cable (13) becomes indispensable, and there is a problem that a user program to be set in the control circuit (8) becomes complicated.

A control object (19a) shown in FIG.
(19b) is the same control target, and state data output from the control target is supplied to the programmable control device (12) via the I / O unit (2) and the programmable display device (1).
The same problem as described above occurs when the control data is input to the control data and the control data generated thereby is output to the control target.

An object of the present invention is to provide a communication cable (13) in a case where the programmable controller (12) refers to data stored in the programmable display (1).
It is an object of the present invention to provide a display control system in which data can be referred to by an internal process of the programmable control device (12) without performing communication via the PC.

[0014]

A display control system according to the present invention comprises a programmable control device (12) and a programmable display device (1) connected to each other. here,
The programmable control device (12) is connected to the control target and performs data input / output, data input / output means, control means for creating control data to be supplied to the control target, state data from the control target and Memory means for storing control data for the controlled object. Further, the programmable display device (1) includes a display unit for displaying a state of the control target, an input unit for inputting a command for the control target, input data from the input unit and / or a state from the control target. Display control means for controlling the operation of the display means based on the data, input / output control means for controlling input of status data from the control target and output of control data to the control target, and the input / output control means And memory means for storing state data from the control target connected via the control data and control data to the control target. And
By the display control means of the programmable display device (1),
Data in a specific area provided in the memory means of the programmable display device (1) is periodically written to a specific area provided in the memory means of the programmable control device (12), and data is shared between the two specific areas. Is planned.

In the above display control system, the I / O unit (2) is connected to the programmable display device (1) as shown in FIG.
A control target (19b) is connected to the programmable control device (12), and a control target (19a) is connected to the programmable control device (12).
The specific area of the memory means of the programmable controller (12) is periodically updated to the same data content.

Therefore, the programmable display device (1) has I
The control target (19a) connected to the programmable control device (12) is changed according to the state data of the control target (19b) connected via the / O unit (2).
Control by programmable controller
In (12), it is possible to directly refer to a specific area of the memory means to be equipped, and thereby, it is possible to recognize data in a specific area of the memory means of the programmable display device (1).

The control object (19a) shown in FIG.
(19b) is the same control target, and state data output from the control target is supplied to the programmable control device (12) via the I / O unit (2) and the programmable display device (1).
Also, when the control data created thereby is to be output to the control target, the programmable controller (12) reads out the data directly from the specific area of the memory means to be equipped, and reads the data. What is necessary is just to output to a control object. Therefore, according to the display control system of the present invention, the control operation of the programmable control device (12) does not require the communication via the communication cable as in the related art, and thereby, the user to be set in the programmable control device (12) is not required. The program is also simple.

Specifically, a programmable display device (1)
The display control means writes the data at a cycle that is an integral multiple of the activation cycle of the input / output control means. As a result, the load on the display control means of the programmable display device (1) is reduced, and a high-speed display control operation is realized. However, the data update to the memory means of the programmable control device (12) is intermittent, but this does not cause a great hindrance to the operation of the programmable control device (12).

More specifically, a programmable display device
The display control means (1) writes the data only to the changed data among the data in the specific area of the memory means. Therefore, a programmable display device is used for all data in a specific area of the memory means.
High-speed data processing is realized as compared with the case where data is written to the memory means of (1).

[0020]

According to the display control system of the present invention, the control target connected to the programmable display device (1) via the I / O unit (2) is controlled by the control of the programmable control device (12). Alternatively, when processing data from the control target, a specific area of the memory means to be provided may be referred to, and a target operation can be realized by internal processing of the programmable control device (12).

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIG. 1, a display control system according to the present invention comprises a programmable display device (1) and a programmable control device (12) connected by a communication cable.
(13) and connected to each other via the I / O unit (2) to the programmable display device (1).
(19b) is connected, and the control target (19a) is connected to the programmable controller (12).

The programmable display device (1) includes a display (4) composed of a liquid crystal display or the like, and a transparent touch-input operation panel attached to a screen of the display (4).
(5) A control circuit (3) composed of a microcomputer or the like, an internal memory (6) used for display control by the control circuit (3), and an input / output control by the control circuit (3) And a control memory (7). A plurality of tasks such as a communication task, a display task, a touch input task, and a control task are registered in the control circuit (3), and the control circuit (3) executes multitask processing. Here, the control task and the control memory (7) of the control circuit (3) are newly provided in the programmable display device (Japanese Patent Application No. 8-232007) proposed in the present application.

The communication task controls communication with the programmable controller (12) in response to a read / write request, and implements data read / write. Control task is I / O
A predetermined procedure such as input / output control is executed for the control target (19b) connected via the unit (2), and the result is updated in the control memory (7). The display task realizes data display on the screen of the display unit (4) in response to a data display request.

On the other hand, the programmable control device (12) includes a control circuit (8) connected to the programmable display device (1) via a communication cable (13), and a device memory used for controlling the control circuit (8). (10) and I / O with input / output terminals
An I / O unit (9) is connected to an input / output terminal of the I / O unit (9). The control circuit (8) of the programmable control device (12) operates according to a user program created in advance using a ladder language, and performs a predetermined control function.

First, a general operation of the display control system will be described, and then, an operation relating to memory area sharing according to the present invention will be described. Control target (19a)
Operation panel of programmable display device (1)
When (5) is operated, the data input by the operation is temporarily stored in the internal memory (6), and then the communication cable is operated.
It is supplied to the programmable controller (12) through (13), and accordingly, the control circuit (8) of the programmable controller (12)
Creates control data, which is temporarily stored in the device memory (10) and then output to the control target (19a) via the I / O unit (9). This allows the controlled object (19
The operation of a) will be controlled. The state data obtained from the control target (19a) is temporarily stored in the device memory (10) of the programmable controller (12), and then stored in the communication cable.
(13) Internal memory of programmable display device (1)
(6), and the control circuit (3) creates display control data in response to this, and the display control data is supplied to the display (4). This causes the display (4) to display the control object (19
The operation state of a) will be displayed.

When the operation panel (5) of the programmable display device (1) is operated on the control object (19b), the control task of the control circuit (3) is executed in response to the operation, and the control task is created. The control data is temporarily stored in the control memory (7) and then supplied from the I / O unit (2) to the control target (19b), whereby the control target (19) is controlled.
The operation of a) will be controlled. The state data obtained from the control target (19b) is temporarily stored in the control memory (7) of the programmable display device (1) via the I / O unit (2), and the control circuit (3) responds accordingly to the display control. Data is created, and the display control data is supplied to the display (4). As a result, the operating state of the control target (19b) is displayed on the display (4).

In the display control system, the control memory (7) of the control circuit (3), the internal memory (6), and the device memory (10) of the programmable display device (1).
As shown in FIG. 2, specific areas (7a), (6a), and (10a) where common data are to be stored are provided, and the same data is stored in these specific areas by a procedure described later. Will be.

FIG. 4 shows an execution procedure of a user program registered in the control circuit (3) of the programmable display device (1). First, in step S1, all contents of a specific area of the internal memory (6) are stored in the control memory.
The data is written in the specific area (7).
As shown in (5), all the flags set in each address of the specific area of the control memory (7) are cleared. Next, after executing a series of user programs in step S3, in step S4, the pointer address is set to the start address of the specific area of the control memory (7).

Subsequently, in step S5, it is determined whether or not the pointer address is the last address of the specific area.
In the case of ES, the procedure ends. If the determination is NO, the process proceeds to step S6, and it is determined whether or not the flag of the address is ON. If the determination is YES, the process proceeds to step S7.
It is determined whether or not the current time is the time of refresh.
Here, the refresh cycle is an integral multiple (for example, 10 to 20 times) of the start cycle of the control task of the control circuit (3).
When the user is set to the period, and it is determined that refreshing is to be performed, a write request is issued to the communication task of the control circuit (3) in step S8. As a result, the communication task is started, and the data at the address in the control memory (7) is communicated to the programmable controller (12).
To be written to the corresponding address of the device memory (10).

Thereafter, in step S9, the data at the address in the control memory (7) is written to the corresponding address in the internal memory (6). Subsequently, after counting up the pointer address in step S10, the process returns to step S5, and the same procedure is repeated. On the other hand, when NO is determined in the step S7, the process goes to the step S9, bypassing the step S8, and proceeds to the step S9.
The writing of data to the device memory (10) in (12) is omitted. If NO is determined in the step S6, the process goes to the step S10, bypassing the steps S7 to S9, and the writing of data to the device memory (10) and the internal memory (6) is omitted.

By the above procedure, each specific area of the control memory (7) of the control circuit (3), the internal memory (6), and the device memory (10) of the programmable display device (1).
(7a) The data in (6a) and (10a) is at least the control circuit (3)
Will be updated to the same data at a cycle that is an integral multiple of the startup cycle of the control task.

Therefore, the programmable display device (1) has I
The control target (19a) connected to the programmable control device (12) is changed according to the state data of the control target (19b) connected via the / O unit (2).
Control by programmable controller
(12) can recognize the data of the specific area of the control memory (7) of the programmable display device (1) by directly referring to the specific area of the device memory (10).

The control target (19a) and the control target (19b) are the same control target, and the state data output from the control target is an I / O unit (2) and a programmable display device (1). When the control data is input to the programmable control device (12) and the control data created thereby is to be output to the control target, the programmable control device (12) is directly connected to the specific area of the device memory (10). , The control target (19a) may be controlled based on the data. Therefore, the communication via the communication cable does not intervene in the control operation, thereby speeding up the control operation and simplifying the user program to be set in the programmable control device (12).

According to the procedure shown in FIG.
The writing of data to (6) is performed at the start cycle of the control task, but the programmable control device (12)
Since the writing of data to the device memory (10) is performed at a cycle that is an integral multiple of the activation cycle of the control task, the load on the control circuit (3) of the programmable display device (1) is reduced, and high-speed display control is performed. Operation is realized. Furthermore, the control task of the programmable display device (1) is performed only on the changed data among the data in the specific area of the control memory (7).
Since the data is written to the corresponding address in (6), high-speed data update processing is realized.

The description of the above embodiments is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a display control system according to the present invention.

FIG. 2 is a diagram showing specific areas provided in a device memory of a programmable control device, an internal memory of a programmable display device, and a control memory.

FIG. 3 is a diagram showing flags set at respective addresses of a specific area in a control memory.

FIG. 4 is a flowchart illustrating a user program execution operation by a control circuit of the programmable display device.

FIG. 5 is a block diagram illustrating a configuration of a conventional display control system.

[Explanation of symbols]

 (1) Programmable display device (12) Programmable control device (13) Communication cable (2) I / O unit (3) Control circuit (6) Internal memory (7) Control memory (10) Device memory

Claims (3)

[Claims] 1. A display control system comprising a programmable control device (12) and a programmable display device (1) connected to each other, wherein the programmable control device (12) is connected to an object to be controlled and transmits data. Data input / output means for performing input / output, control means for creating control data to be supplied to the control target, and memory means for storing state data from the control target and control data to the control target The programmable display device (1) includes a display unit for displaying a state of a control target, an input unit for inputting a command to the control target, and input data from the input unit.
Or display control means for controlling the operation of the display means based on state data from the control target, and input / output control means for controlling input of state data from the control target and output of control data to the control target. Memory means for storing status data from the control target connected via the input / output control means and control data to the control target, and display control means of the programmable display device (1),
Data in a specific area provided in the memory means of the programmable display device (1) is periodically written to a specific area provided in the memory means of the programmable control device (12), and data is shared between the two specific areas. A display control system characterized by the following. 2. The display control means of the programmable display device (1) has a cycle which is an integral multiple of a start cycle of the input / output control means,
The display control system according to claim 1, wherein the writing of the data is performed. 3. The display control means of the programmable display device (1) writes the data only in the changed data among the data in the specific area of the memory means. The display control system according to 1.