JPH05224713A - Display method for programmable controller - Google Patents

Abstract

PURPOSE:To eliminate the need for a special user program for conversion only by setting the desired optional numerical value or character code on a display device by storing the numerical value or the characters in a display register corresponding to a display area and displaying the character code on the display device. CONSTITUTION:When the display processing is started, whether the data are stored in a numerical value display data register 5a or not is judged. The stored numerical value is converted into a character code and sent to a display device 7 together with the signal specifying a display device. When the register 5a stores no data or the numerical value in the register 5a and in the case of storing the data, the numerical value is converted into a character code, and whether the character data are stored in the register 5a or not, is judged. If so, the relevant character code is sent to the device 7. These I/O transfer and the execution/display of a program are cyclically repeated, and the data are sent to the device 7 together with the signal specifying a display position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display method of a programmable controller (hereinafter referred to as PC).

[0002]

2. Description of the Related Art FIG. 6 is a flowchart showing the operation of a conventional PC during run control. As shown, I / O transfer and program execution are cyclically repeated. Here, in the I / O transfer, input data from the input board is fetched and output data is output to the output board. In executing the program, the user program is executed.
When displaying the calculation data of the user program on the display unit, a program for creating the display data and a program for the display processing after the creation are provided in the user program, and the programs are displayed by executing the programs. It was processing. Therefore, the display command is used when displaying characters and the like on the programmer or the programming panel by the user program. FIG. 7 is an explanatory diagram showing an example in which a display command is used. In this example, IO is O
It is an example of a program for displaying the characters "ABCD" on the display when N.

[0003]

The conventional PC display method is as described above, and since it is not possible to display directly on the display unit only by creating display data, a separate display processing program is required in the user program. , For example PC
When displaying the numerical value of the data register, a user program for displaying the numerical value is required, and this program itself becomes complicated. In addition, a user program is required to display a character / numerical value at an arbitrary display position, and in any case, the user's programming work is burdened.

The present invention has been made in order to solve such a problem, and a user can freely display characters and numerical values without creating a complicated user program, and display them in real time. It is an object of the present invention to provide a display method of a PC that is made possible.

[0005]

Means and Actions for Solving the Problems P according to the present invention
The display method of C is such that the step of input / output transfer, the step of executing a program, and the step of performing a display process are cyclically repeated, and when a numerical value or character is displayed on a display, the program is executed. In the process, the displayed numerical value or character is stored in the display data register corresponding to the display area of the display unit, and in the display process, the numerical value of the display data register is converted into a character code and the character code and its display are displayed. A signal for specifying the display data register is sent to the display, and for the character, its character code and a signal for specifying the display data register are sent to the display.

[0006]

FIG. 2 is a block diagram showing a hardware configuration of a PC for implementing a display method according to an embodiment of the present invention. In the figure, 1 is a CPU, and 2 is a ROM in which a system program that controls the arithmetic processing of the CPU is stored. 3 is a PROM in which a user program is stored,
A RAM 4 stores input / output data and the like. 5
Is a display data register composed of a RAM, and is composed of a numerical value display data register 5a and a character display data register 5a corresponding to the divided display areas of the display unit described later. Reference numeral 6 is an interface, and 7 is a display device for displaying various data and the like input via the interface 6.

FIG. 3 is an explanatory view showing an example of division of the display area of the display device 5. In this example, it is divided into eight areas a, b, c, ..., H. FIG. 4 is a diagram showing the relationship between the display data register of FIG. 3 and the divided display area of the display. The divided display areas a to h correspond to the data registers RYY00 to RYY07 of the numerical value display data register 5a, and the data display R of the character display data register 5b.
It corresponds to YY10 to RYY17.

FIG. 5 is a flow chart showing the operation in the run control of the PC of FIG. As shown in the figure, I / O transfer and program execution are performed in the same manner as in the prior art. In this embodiment, however, a program for setting information that the user wants to display in the display data register 5 is stored in the user program. The display data is created during the execution of the program and the numerical value or character is stored in the display data register 5. Then, display processing is performed after the execution of this program.

FIG. 1 is a flow chart showing the operation of display processing. When the display process starts, it is determined whether or not data is stored in the numerical value display data register 5a.
(S10). When data is stored in the numerical value display data register 5a, the numerical value is converted into a character code and sent to the display 7 together with a signal for specifying the display device (S11). Next, when the data is not stored in the numerical value display data register 5a or when the data is stored in the numerical value display data register 5a and the numerical value is converted into the character code, the character display data is next. It is determined whether character data is stored in the register 5b (S12). When it is determined that the character data is stored, the character code is sent to the display unit 7. I / O
When transfer, program execution and display processing are cyclically repeated and data is stored in the display register 5, the data is converted into display data and sent to the display 7 together with a signal for specifying the display position. Is displayed.

For example, if the numerical value "1234" is set in the data register RYY00 of the numerical value display register 5a, the CPU 1 reads the contents of RYY00 (S10) and converts the numerical value "1234" into a character code. The conversion is performed as follows. 1 → 31h, 2 →
32h, 3 → 33h, 4 → 34h The CPU 1 converts the converted character code 31h / 32h / 33h.
The display unit 7 sends the converted character code to the display unit 7 together with a signal for specifying the display position of a so that 34h is displayed at the position "a" in FIG. 3 (S11). Display 7 is CP
In response to an instruction from U1, the character code is converted into display data at the display position of "a" in FIG. 3 and the numerical value "1234" is displayed.

If the character code B1B2 (eye) is set in the data register RYY17 of the character display register 5b, the CPU 1 determines the data register RYY.
The character code of 17 is read (S12), and the character code B
The character code is sent together with the signal for specifying the display position of h so that 1B2 is displayed at the display position of h in FIG. 3 (S13). The display device 7 is displayed on the screen of FIG.
At the display position of, the character code is converted to display data and the character "eye" is displayed.

In the above-mentioned embodiment, there is a possibility that it is instructed to display numerical values and characters in the same display area of the display device in duplicate, but in such a case, in the display processing step. This can be dealt with by prioritizing either one. In order to eliminate such a possibility, for example, a to d are character display areas, and e to h
May be set in advance as a numerical display area so that they do not overlap.

[0013]

As described above, according to the present invention, when a numerical value or a character is displayed on the display, a display data register corresponding to the display area of the numerical value or the display to be displayed during the execution process of the program is displayed. In the display process, the numerical value is converted to a character code in the display process, and the character code is sent to the display unit for display, so any numerical value or character code that the user program wants to display can be displayed. The data can be displayed on the display simply by setting it in the data register for use, and there is no need to create a conversion user program for displaying numerical values. Moreover, since the display process is cyclically repeated, such data can be displayed in real time.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of display processing in a display method of a PC according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a hardware configuration of a PC that implements the embodiment.

FIG. 3 is an explanatory diagram showing an example of division of a display area of a display unit 5.

FIG. 4 is a diagram showing a relationship between a display register and a divided display area of a display unit.

5 is a flowchart showing an operation in run control of the PC of FIG.

FIG. 6 is a flowchart showing an operation during run control of a conventional PC.

FIG. 7 is an explanatory diagram showing an example in which a conventional display command is used.

Claims (1)

[Claims] 1. A program is executed when a numerical value or a character is displayed on a display device by cyclically repeating a process of input / output transfer, a process of executing a program, and a process of displaying. In the step, the numerical value or character to be displayed is stored in the display data register corresponding to the display area of the display, and in the display processing, the numerical value of the display data register is converted into a character code and the character code and its A display method for a programmable controller, wherein a signal specifying a display data register is sent to a display device, and a character code of a character and a signal specifying the display data register are sent to the display device.