JPH10105226A - Programmable display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both display and control functions and also to accelerate data processing by connecting a data input-output means to an input-output controlling means. SOLUTION: An I/O unit 2 is connected to a connector 10 that is provided on a device main body, and a controlled system 19b is connected to the unit 2. Also, a programmable controller 12 is connected via a communication cable 13 and a controlled system 19a can be connected like a conventional programmable display device. Basic functions of control circuits which constitute a conventional programmable controller is realized by an I/O control interface 9, and the function of an I/O unit that constitutes a conventional programmable controller is realized by the unit 2. The control and operation state of the system 19b can be shown without using the controller 12. Also, an operation panel 5 can directly handle an I/O control memory 8, and therefore, it is possible to accelerate data processing.

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.

[0002]

2. Description of the Related Art Conventionally, as a system for displaying an operation state of a control target and controlling the control target, as shown in FIG. 8, a programmable display device (11) mainly having a display function and a control function 2. Description of the Related Art There is known a system in which a programmable controller (12) provided with a computer 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 configured by a microcomputer or the like and includes the programmable display device (11).
And control circuit (16) connected via communication cable (13)
, An input / output control memory (17), and an I / O unit (18) having input / output terminals.
The control target (19) is connected to the input / output terminal of (8). 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.
The data stored in the memory (15) of the programmable display device (11) can be directly handled by operating the operation panel (5), but the data stored in the memory (17) of the programmable control device (12) can be used. In order to handle such data, communication via the communication cable (13) is necessary, and there is a problem that data processing takes time.

It is an object of the present invention to provide a programmable display device having both a display function and a control function and achieving high-speed data processing.

[0006]

According to the present invention, there is provided a programmable display device comprising: display means for displaying a state of a control target; input means for inputting a command to the control target; and input data from the input means. And / or display control means for controlling the operation of the display means based on state data from the control target, a display control memory having a dedicated area to be provided for a control operation by the display control means, and a state from the control target. An input / output control means for controlling the input of data and the output of control data to the control target; and an input / output control device having a dedicated area for storing status data from the control target and control data to the control target. With memory,
The display control means can write and read data for both memories. Specifically, the input / output control means is connected to a data input / output means which is connected to a control object and inputs state data and outputs control data.

In the above-mentioned programmable display device,
Control circuit that constitutes conventional programmable controller (12)
The basic function of (16) is realized by the input / output control means, and the I / O constituting the conventional programmable controller (12).
The function of the O unit (18) is realized by data input / output means. Therefore, in order to control a single or a small number of control targets, the conventional programmable control device (12) is unnecessary, and the communication that connects the conventional programmable display device (11) and the programmable control device (12) to each other is not necessary. cable
(13) becomes unnecessary. As a result, the programmable display device (1) according to the present invention is
It is smaller than the combination of 1) and the programmable controller (12).

In the construction of a large-scale system for controlling a large number of controlled objects, a programmable control device is connected to the programmable display device of the present invention via a communication cable, and the programmable control device is connected to the programmable display device. What is necessary is just to connect a control target to each of the plurality of equipped I / O units.

In the above-mentioned programmable display device, since both the display control memory and the input / output control memory are to be written and read by the display control means, they are stored in both memories by operating the input means. Data can be handled directly. Therefore, the data processing is performed at high speed without communication via the communication cable as in the related art.

In a specific configuration, the display control means includes a plurality of tasks including a data input task corresponding to an operation of the input means, a display task for the display means, and a communication task for controlling communication with an external programmable controller. The input / output control means is configured as an input / output control task to be added to the task of the display control means. Here, the data input task includes means for determining which memory the input data should be written to in response to an input operation on the input means, and means for writing the input data to the determined memory. The display task includes means for determining from which memory data should be read in response to a data display request to the display means, and means for reading specified data from the determined memory.

In the above specific configuration, multitask processing is executed according to a preset priority of each task. Here, when the data input task or the display task is activated, it is set in advance which of the display control memory and the input / output control memory should be written or read according to the contents of the display or control. According to this, data is written in one of the designated memories, or the data in the memory is displayed on the display means.

[0012]

Since the programmable display device according to the present invention has the control function of the programmable control device, it is possible to control the controlled object and display the operation state thereof without using the programmable control device. The device can be downsized. Further, since the input / output control memory can be directly handled by operating the input means, communication processing does not intervene and data processing can be speeded up.

[0013]

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, in a programmable display device (1) according to the present invention, an I / O unit (2) can be connected to a connector (10) provided in a device main body. Connect the control target (19b) to 2). Further, similarly to the conventional programmable display device, a programmable controller (12) is connected via a communication cable (13), and the programmable controller (12) is connected.
It is also possible to connect the control target (19a) to the control.

The programmable display device (1) includes 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) and a display control memory connected to the control circuit (3)
(7) and an I / O control memory (8), and a communication control interface (6) and an I / O control interface (9) comprising software executed by the control circuit (3). (6) is a communication cable
A programmable controller (12) is connected via (13),
The I / O control interface (9) has the connector
(10) The I / O unit (2) is connected via (10).

As shown in FIG. 2, the display control memory (7) has an area for writing data to be output to the programmable controller (12), an area for reading data supplied from the programmable controller (12), and a display controller. A dedicated area is provided. On the other hand, the I / O control memory (8) is provided with an input-only area for storing information input from the control target, an output-only area for storing information to be output to the control target, an internal work area, and the like. ing.

The control circuit (3) has a multi-task processing function. As shown in FIG. 3, under the operating system (21) connected to the CPU (20), a main task (22) and a touch input task ( 23), Display task (24), PLC communication task
Multiple tasks such as (25) are registered and the control circuit
As one of tasks to be executed by (3), an I / O control task (26) constituting the I / O control interface (9)
Are additionally registered, and these tasks are activated according to a preset priority.

The main task (22) analyzes a display control program, recognizes a data display request, and issues a processing request to the display task. Note that the display control program uses a “tag function” developed by the applicant. The display control program responds to input data based on “tags” assigned to graphics or numerical images drawn on the screen. (For example, Japanese Patent Publication No. 3-68395,
JP-A-6-214535 and JP-A-6-162155).

The PLC communication task (25) controls communication with the programmable controller (12) in response to a read / write request, and realizes data read / write. I
The / O control task (26) executes an input / output control procedure described later, and updates the result in its own memory. The display task (24) responds to the data display request by
This is to realize data display on the screen of the display (4). Here, the main task (22) and the touch input task (2
3), the display task (24),..., The PLC communication task (25) is a task inherent to the programmable display device (programmable display function), whereas the I / O control task (2)
6) exerts the input / output control function conventionally provided in the programmable controller.

FIG. 4 shows a processing procedure of the main task (22). First, in step S11, after reading all tags set on the current screen, the process proceeds to step S11.
At 12, the display control memory or the I / O
The start bit is read from the O control memory, and it is determined whether or not the start condition of each tag is satisfied (whether the start bit is on). If YES, the process shifts to step S13 to set the start bit to ON. The task to be started is determined by referring to the tag information for the tag. The task determined in this way is started in step S14, and the task is executed. Thereafter, in step S15, it is determined whether or not there is a screen switch. If yes, the process returns to step S11. If no, the next tag is searched in step S16, and the process returns to step S12 to repeat the same procedure. It is.

When the touch input task is activated in the course of the execution of the main task, as shown in FIG. 5, first, in step S21, it is determined which memory the event of the tag specified by the touch input is directed to. Judge, I / O
If the control memory is designated, step S22
After converting the address registered as the tag information into the I / O control address, the value of the designated memory (display control memory or I / O control memory) is changed in step S23.

When the display task is activated, the display task shown in FIG.
First, in step S31, it is determined which memory the tag event set in the image to be displayed is for. If the I / O control memory is designated, the process proceeds to step S32. After converting the address registered as the tag information into the I / O control address,
In step S33, the value read from the designated memory (display control memory or I / O control memory) is displayed on the display.

When the I / O control task is started, first, as shown in FIG.
The input information from the O unit (2) is written into the input-only area of the I / O control memory. Next, in step S42, the information stored in the output-only area of the I / O control memory is output to the outside (I / O unit (2)). Then, in a step S43, it is determined whether or not an execution condition of a ladder program (user program) to be executed by the I / O control task is satisfied. If YES, the process shifts to a step S44 to execute the ladder program. Execute

According to the programmable display device (1), the function of the control circuit (16) constituting the conventional programmable control device (12) is realized by the I / O control interface (9) and the conventional programmable control device (12) is realized. Control device
Since the function of the I / O unit (18) constituting (12) is realized by the I / O unit (2) connected via the connector (10), all of the functions of the I / O unit (2) are provided. In a relatively small system that can connect the control target (19b)
The conventional programmable control device (12) is not required, thereby reducing the size of the entire device.

Also, by operating the operation panel (5), I / O
Since data can be written directly to the O control memory (8) or data can be read directly from the I / O control memory (8), the control target connected via the I / O unit (2) can be used. Regarding (19b), high-speed data processing is realized. Furthermore, even when there is no state data from the control target (19b), the state of the control target (19b) can be simulated by operating the operation panel (5).
This is convenient for debugging ladder programs or creating emergency stop logic.

In a large-scale system, if a programmable control device (12) is connected via a communication control interface (6) as shown in FIG.
9a) can be connected.

The description of the above embodiments is for the purpose of describing 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 programmable display device according to the present invention.

FIG. 2 is a diagram illustrating a data storage area formed in a display control memory and an I / O control memory.

FIG. 3 is a block diagram showing a plurality of tasks executed by a control circuit.

FIG. 4 is a flowchart illustrating a processing procedure of a main task.

FIG. 5 is a flowchart illustrating a processing procedure of a touch input task.

FIG. 6 is a flowchart illustrating a processing procedure of a display task.

FIG. 7 is a flowchart illustrating a processing procedure of an I / O control task.

FIG. 8 is a block diagram illustrating a configuration of a conventional programmable display device and a conventional programmable control device.

[Explanation of symbols]

 (1) Programmable display device (2) I / O unit (3) Control circuit (4) Display (5) Operation panel (7) Display control memory (8) I / O control memory (9) I / O Control interface (12) Programmable controller

Claims (5)

[Claims] A display means for displaying a state of a control target, an input means for inputting a command to the control target, and a display based on input data from the input means and / or state data from the control target. Display control means for controlling the operation of the means, a memory for display control having a dedicated area to be subjected to the control operation by the display control means, and input of state data from a control target and output of control data to the control target. Input / output control means for controlling, and a memory for input / output control having a dedicated area to be provided for storing state data from the control target and control data to the control target,
The display control means is a programmable display device capable of writing and reading data for both memories. 2. The programmable display device according to claim 1, wherein the input / output control means is connected to a data input / output means connected to a control target to input status data and output control data. 3. The display control means includes a plurality of tasks including a data input task according to an operation of the input means, a display task for the display means, and a communication task for controlling communication with an external programmable control device. The programmable display device according to claim 1, wherein the input / output control unit is configured as an input / output control task to be added to a task of the display control unit. 4. The data input task includes means for judging to which memory the input data is to be written in accordance with an input operation on the input means, and means for writing the input data to the determined memory. The programmable display device according to claim 3. 5. A display task comprising: means for determining from which memory data should be read in response to a data display request to a display means; and means for reading and displaying specified data from the determined memory. 4. The programmable display device according to claim 3, comprising: