JPS6132106A - Programming device of programmable controller - Google Patents

Abstract

PURPOSE:To generate or correct quickly and easily a sequence program by inputting an input/output address of a circuit element so as to display a single or plural circuit elements corresponding to the input/output address on a ladder circuit. CONSTITUTION:A program stored in a sequence memory 12 of a programmable controller 10 is read in a RAM 22 via interfaces 14, 28. When an address of an output element of a relay coil is inputted from a keyboard 27, the sequence program is searched to detect a program block including the output element and the result is transferred to a prescribed area of the storage device. The program block is converted into the circuit element symbol, a ladder circuit is displayed on a screen of a ladder display device 25, and an output address of a specified relay is displayed on a character display device 26. Thus, only the specific ladder circuit is selected among the sequence programs and displayed on a display device comprising a liquid crystal panel having a narrow display screen.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a programming device for a programmable controller, which generates a ladder circuit directly on a screen, and
The present invention relates to a graphic programming device that automatically generates sequence programs.

More specifically, the present invention relates to a programming device that uses a small display such as a liquid crystal display as a display device, and is capable of facilitating debugging of a sequence program.

[Conventional technology]

Conventionally, programming devices for programmable controllers include devices that automatically create a sequence program by directly creating a ladder circuit on the screen of a display device, and devices that create a corresponding ladder circuit from the sequence program on the screen of the display device. Devices for directly modifying ladder circuits are known.

In this type of graphic programming system,
It is necessary to display the patterns of circuit elements such as relay contacts and their input/output addresses on the screen for creating and editing sequence programs.

For large displays using CRT, 1. Since the screen could be configured to be large, there was no problem in displaying input/output addresses along with circuit elements.

However, in a display device using a small display screen such as a liquid crystal panel, the display area of the display screen is small, and it is difficult to display input/output addresses together with circuit elements. Therefore, there is a device that allows you to know the input/output address of the circuit element by identifying the circuit element using, for example, a cursor, and displaying the input/output address of the identified circuit element on another character display. . However, this device only searches one input/output address corresponding to one circuit element, and cannot conversely find out the single or plural circuit elements corresponding to it from the input/output address. Therefore, if you know the input/output address and want to find the corresponding circuit element, you can specify the input/output elements on the display screen one by one and find the input/output addresses one by one to obtain the desired input/output address. Until recently, many circuit elements had to be searched on the screen. Therefore, it is not easy to determine whether an input/output device connected to a predetermined input/output address is actually installed correctly on a ladder circuit.

[Problem to be solved by the invention]

The present invention was made to solve these conventional drawbacks, and allows programming by inputting input/output addresses and identifying the corresponding circuit elements in the ladder circuit displayed on the screen. The purpose is to improve the ease and speed of creating, modifying, editing, etc.

[Means for solving problems]

FIG. 1 is a block diagram illustrating the concept of the present invention.

The present invention includes an input device 100 for inputting circuit elements of a ladder circuit and their input/output addresses, and a circuit element pattern generated on a screen according to an input signal from the input HW 100 to create a ladder circuit. A programming device for a programmable controller comprising: a control device 200 that performs mutual conversion between a ladder circuit and a sequence program corresponding to the ladder circuit; and a display device 300 that displays the ladder circuit based on a control signal from the control device. , the control device 200 includes a circuit element search unit 210 that searches for a circuit element corresponding to the input/output address from the input/output address of the circuit element input from the input device 100.
and a circuit element display unit 220 for displaying, on the screen of the display device 300, a display specifying the circuit element searched by the circuit element search unit 210.
It is.

〔Example〕

Hereinafter, the present invention will be explained in detail based on specific examples.

FIG. 2 is a block diagram showing the configuration of a programming device for a programmable controller according to a specific embodiment of the present invention, together with the configuration of the programmable controller. The programmable controller 10 includes an arithmetic processing section 11, a sequence memory 12 for storing sequence programs, an input/output circuit 13 for connecting circuit elements, and an interface 14 for transmitting and receiving data with the programming device 20. The input/output circuit 13 is connected to input elements such as limit switches, pushbutton switches, and relay contacts, and output elements such as relay coils, and each input/output element has a unique function for selecting them. I/O addresses are assigned.

On the other hand, the programming device 20 has an interface 28
It is connected to the programmable controller 10 via. The programming device 20 has a microcomputer 21, a system ROM 23, and a RAM 22.

An input/output interface 30 is connected to the microcomputer 21 via a common bus, and a keyboard 27 and a lamp display 270 are connected to it. Further, a ladder display 25 for displaying a ladder circuit is connected to the common bus via a ladder display interface 24, and a character display 26 for displaying addresses of circuit elements is connected via a character display interface 29. It is connected.

FIG. 3 is an external view of the programming device of this embodiment.

The keyboard 27 has keys for inputting circuit elements. That is, relay open contact 271, relay close contact 27
2. It has symbol keys that can input circuit elements such as a relay coil 275 and a timer relay 276.

Next, the operation of the device of the present invention will be explained. FIGS. 4 and 5 are flowcharts illustrating the operation of the computer used in the apparatus of this embodiment.

The computer begins execution at step 100. In step 100, the sequence program stored in the sequence memory 12 of the programmable controller 10 is read into the RAM 22 via the interface 14 and the interface 28. Next, the process moves to step 102, and the address of the output element of the relay coil is entered on the keyboard 27.
Enter from. Next, in step 104, the sequence program is searched to detect a program block containing the output element. This program block is transferred to a predetermined area BDA on the storage device. This program block is as shown in FIG. This program block corresponds to the ladder circuit shown in FIG. This program block is converted into a circuit element symbol in step 106, and a ladder circuit is displayed on the screen of the ladder display 25 as shown in FIG. Next, in step 108, the identified relay output address (
Here, r200J) is displayed on the character display 26. In this way, only a specific ladder circuit section of the sequence program can be selected and displayed on a display consisting of a liquid crystal panel with a narrow display screen.

Next, when the operator operates the ■0 search key 278 with the ladder circuit displayed as shown in FIG. 8, the computer reads the input/output address of the circuit element from the keyboard 27 in step 200. For example, if input/output address "110" is input, step 202
, step 204, and step 206, the program block shown in FIG. 7 is searched, and the address is "11".
0'' is searched for. If the instruction step is found in step 206, step 20
The cursor information for displaying the cursor in 7th
It is stored in a predetermined area B of the data block shown in the figure.

By searching the program block in this manner, all instruction steps having input/output address r110J are searched. When the search for this data block is completed in step 210, the process moves to step 212, and the flag in the cursor information column B of the data block shown in FIG. 7 is set to 1.
In order to specify the circuit element corresponding to the instruction unit that is set to , a cursor is displayed on the unit section displaying the circuit element on the screen. As a result, a screen with a cursor display as shown in FIG. 9 is obtained. That is, it can be seen that the circuit element whose input/output address is rlloJ is the relay open contact 500 and the relay close contact 501. In this way, it is possible to easily and quickly find out whether the circuit element corresponding to the input/output address is correctly programmed.

In the above embodiment, this programming device is used for debugging a sequence program. However, the device of the present invention not only debugs a sequence program that has been created once, but also automatically creates a sequence program while generating a ladder circuit by operating a symbol key. It can also be used to determine whether a circuit element corresponding to an address is installed.

In addition, in the above embodiment, in order to specify a part of the ladder circuit to be displayed on a display with a narrow display screen, the output address of the output circuit element (relay coil) is specified, and the ladder circuit related to it is specified from the sequence program. I'm trying to search and display that circuit part. However, by inputting the address of the input/output circuit element that one wants to know directly, the circuit element having that address may be directly searched for from the sequence program, and the corresponding circuit elements may be sequentially displayed on the display. Further, to identify a circuit element on the screen, in addition to displaying a cursor, the circuit element pattern may be flashed.

〔Effect of the invention〕

By inputting the input/output address of a circuit element, the device of the present invention can display one or more circuit elements corresponding to the input/output address on the ladder circuit. Therefore, according to the device of the present invention, it is possible to easily and quickly create or modify a sequence program.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the concept of the device of the present invention. FIG. 2 is a block diagram showing the configuration of a programming device according to a specific embodiment of the present invention together with the configuration of a programmable controller. Third
The figure is a plan view of the device of this embodiment. FIGS. 4 and 5 are flowcharts showing the processing of the computer used in the apparatus of the same embodiment. FIG. 6 is a circuit diagram showing an example of a ladder circuit for explaining the operation of the apparatus of the embodiment. FIG. 7 is a diagram showing a sequence program corresponding to the ladder circuit of FIG. 6. FIG. 8 and FIG. 9 show the display screen of the ladder display device. Patent applicant Toyoda Machine Tool Co., Ltd. Toyota Motor Corporation Sharp Corporation

Claims (1)

[Claims] (1) An input device for inputting the circuit elements of a ladder circuit and their input/output addresses, and generating a circuit element pattern on the screen according to the input signal from the input device to create a ladder circuit, and generating the ladder circuit. A programming device for a programmable controller comprising: a control device that performs mutual conversion between a program and a corresponding sequence program; and a display device that displays a ladder circuit based on a control signal from the control device. , a circuit element search unit that searches for a circuit element corresponding to the input/output address from the input/output address of the circuit element input from the input device; and a display that identifies the circuit element searched by the circuit element search unit. A programming device for a programmable controller, comprising: a circuit element display section for displaying on the screen of the display device.