JPH05173609A - Automatic generation device for sequence program - Google Patents

Abstract

PURPOSE:To automatically generate a sequence program represented by a ladder figure used in a field of sequence control. CONSTITUTION:An analysis part 3 analyzes the specification of the sequence program described in time chart form which is inputted from an input part 1 to extract at least a controlled object, control start conditions, control stop conditions, and control order; and a conversion part 51 converts the intermediate data into the sequence program represented by the ladder figure according to a conversion rule which is stored in a conversion rule storage part 52 and converts the intermediate data into the sequence program represented by the ladder figure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequence program automatic generation apparatus for automatically generating a sequence program represented by a ladder diagram used in the field of sequence control.

[0002]

2. Description of the Related Art Recently, a line for manufacturing various products has been automatically controlled by a computer, and a sequence program is used for such computer control.

By the way, in the field of such sequence control, a sequence program represented by a ladder diagram is mainly used. These programs based on the ladder diagram are described in advance by a time chart corresponding to the movement of the manufacturing line. The programmer interprets the created sequence specifications and creates a program using the ladder diagram.

[0004]

However, if humans rely on the creation of a program based on a ladder diagram in this way, not only will it take time to develop the program, but also the personnel costs will increase, which will increase the production cost. However, it is a considerable burden, and errors are likely to occur due to continuous artificial work,
There was a problem that the reliability of the program also decreased.

The present invention has been made in view of the above circumstances, and provides a sequence program automatic generation apparatus capable of shortening the development period of a program and preventing human error and further reducing the development cost. The purpose is to

[0006]

The sequence program automatic generation apparatus of the present invention comprises an input means for inputting the specifications of a scenes program described in a time chart format.
A specification analysis unit that analyzes the specifications of the scene program input from the input unit and extracts at least the control target, control start condition, control stop condition, and control order and outputs as intermediate data, a scene in which the intermediate data is represented by a ladder diagram Conversion rule storage means for storing conversion rules for conversion into a program, and a sequence program in which intermediate data output from the specification analysis means with reference to the conversion rules stored in the conversion rule storage means is expressed in a ladder diagram. It is composed of conversion means for converting into.

[0007]

As a result, according to the present invention, the control target, the control start condition, the stop condition and the control order of the control target are extracted from the time chart formally described as the specification,
By referencing these results with the conversion rule, it will be converted into a sequence program expressed in a ladder diagram,
Since the conversion operation into the sequence program can be automatically performed, it becomes possible to prevent the error on the artificial program including the shortening of the development period of the program.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of the same embodiment. In the figure, reference numeral 1 designates an input unit, which inputs the specifications of a sequence program described by a time chart for controlling a predetermined manufacturing line. Then, the sequence specification of the time chart description input from the input unit 1 is converted into the time chart file 2
I try to remember it.

A specification analysis unit 3 is connected to the time chart file 2. The specification analysis unit 3 analyzes the sequence specification of the time chart description read from the time chart file 2 and extracts a control target, a control start condition, a control stop condition, and a control order. The analysis result of the specification analysis unit 3 is stored in the intermediate data file 4 as intermediate data.

A program generator 5 is connected to the intermediate data file 4. The program generation unit 5 is composed of a conversion unit 51 and a conversion rule storage unit 52, and converts the intermediate data read from the intermediate data file 4 by the conversion unit 51 into a conversion rule stored in the conversion rule storage unit 52. It is designed to be converted into a sequence program expressed by a ladder diagram with reference.

Here, the conversion rule storage unit 52 stores conversion rules for converting the intermediate data into a sequence program represented by a ladder diagram. The conversion rules in this case are set as follows. ing. Rule 1 ... One operation (set of control start and control stop) for one control target is one circuit in the ladder diagram.

That is, for example, as shown in FIG. 2A, the same applies to a time chart in which the control target A is turned on by turning on the sensor S0 and the control target A is turned off by turning on the sensor S1. As shown in FIG. 2B, the switch S01 and the sensor S which are closed by turning on the sensor S0.
The switch S11 and the control target A that are opened by turning on 1
It is a ladder circuit consisting of a series circuit of. Rule 2 ... When the control start condition is not held during the operation of the controlled object, a self-holding circuit is provided to hold the operation of the controlled object.

That is, for example, as shown in FIG. 3A, the control target A is turned on by turning on the sensor S0, and even if the sensor SO is turned off thereafter, the control target A is kept on,
For a time chart in which the control target A is turned off by turning the sensor S1 on, a switch S01 that closes when the sensor S0 is turned on and a self-holding switch A1 of the control target A are turned on as shown in FIG. A switch S that is connected in parallel and opens in this parallel circuit by turning on the sensor S1.
11 is a ladder circuit in which a series circuit of the control target A is connected. Rule 3: When a plurality of events detected by the same sensor exist and it is necessary to distinguish them, a counter is used to distinguish the events.

That is, for example, a time such that the controlled object A is operated by the first ON of the sensor S0 as shown in FIG. 4A and the controlled object A is stopped by the second ON of the sensor S0. As for the chart, a series circuit of a switch S01 and a counter CNT which is closed by turning on the sensor S0 as shown in FIG.
In the parallel circuit of the switch CNT1 which is closed by the first ON and the self-holding switch A1 of the controlled object A, the switch CNT2 which is opened by the second ON of the counter CNT.
And a serial circuit of the controlled object A are connected to each other to form a ladder circuit.

The sequence program represented by the ladder circuit generated by the program generator 5 is stored in the sequence program file 6.

Reference numeral 7 is a control unit, which is responsible for controlling the control of the time chart file 2, the specification analysis unit 3, the intermediate data file 4, and the program generation unit 5 described above. The control command is output. Next, the operation of the embodiment configured as described above will be described.

In this case, the case where the specifications of the scenes program described in the time chart format as shown in FIG. 5 are input will be described. FIG. 5 shows a system including a start switch, a control target A, and a control target B.
0, S1, and S2 are sensors, a sensor S0 is a sensor that detects that the activation switch is pressed, a sensor S1 is a sensor that detects that the control target A is operating, and a sensor S2.
Is a sensor that detects that the controlled object B is stopped. Also, the broken lines indicate the mechanical time delays of the controlled objects A and B, and the arrows indicate the start conditions and stop conditions of the controlled objects A and B.

When the scenes program specifications described in the time chart format described above are input from the input unit 1, the sequence specifications of the time chart description are stored in the time chart file 2.

After that, the sequence specification of the time chart description stored in the time chart file 2 is set in the control unit 7.
And is sent to the specification analysis unit 3. And
By the analysis processing in the specification analysis unit 3, the controlled object, the control start condition, the control stop condition, and the state of each sensor are extracted.

In this case, in the specification analysis unit 3, based on the time chart of FIG.
The respective states of 0, S1, and S2 are extracted, and those arranged in the control order are output. Specifically, in the time chart of FIG. 5, at time t1,
The ON state of the sensor S0 and the NO state of the control target A are extracted, and the OFF state of the sensor S0 is extracted at time t2. Further, at time t3, the ON state of the sensor S2 and the ON state of the control target B are extracted. In the same way,
After time t4, the states of the controlled object A, the controlled object B, and the sensors S0, S1, and S2 are extracted, and these results are arranged in control order and stored as intermediate data in the intermediate data file 4 shown in FIG. Then, the intermediate data stored in the intermediate data file 4 is sent to the program generator 5.

Then, the intermediate data is converted by the conversion unit 51 of the program generation unit 5 into a sequence program represented by a ladder diagram with reference to the conversion rules stored in the conversion rule storage unit 52. In this case, in the intermediate data shown in FIG. 6, even if the control target A is turned on when the sensor S0 is turned on in the control order, and the control target A is kept on even if the sensor SO is turned off after that, the sensor S1 is turned on. Since the controlled object A is turned off, the conversion rule 2 described above is applied, and the switch S01 that is closed by turning on the sensor S0 and the self-holding switch A1 of the controlled object A are applied as shown in a of FIG. Is connected in parallel, and the switch S1 is opened in this parallel circuit by the operation of the sensor S1.
A sequence program represented by a ladder circuit in which 1 and a series circuit of the controlled object A are connected is created. Further, in the intermediate data shown in FIG. 6, even if the control target B is turned on by turning on the sensor S2 and the sensor S2 is turned off after that, the on state of the control target B is held and the sensor S3 is turned on.
Since the controlled object B is also turned off by this, the conversion rule 2 described above is applied also in this case, and
As shown in b), the switch S21 which is closed by turning on the sensor S2 and the self-holding switch B1 of the controlled object B are connected in parallel, and the switch S31 which is opened by the operation of the sensor S3 and the controlled object B are connected to this parallel circuit. A sequence program represented by a ladder circuit in which series circuits are connected is created. Then, the sequence program represented by these ladder circuits is stored in the sequence program file 6.

In the above-mentioned time chart shown in FIG. 5, only rule 2 is applied.
Of course, it is needless to say that the present invention can be applied to the time charts to which Rule 1 and Rule 3 are applied.

Therefore, in this way, when the specifications of the scenes program described in the time chart form are input, the input is analyzed and the control target, control start condition,
It is possible to extract control stop conditions and the status of each sensor as intermediate data, and convert this intermediate data into a sequence program expressed in a ladder diagram by following the conversion rules prepared in advance. It is possible to realize automatic creation without relying on human hands. As a result, the burden on the programmer can be significantly reduced, the program development period can be shortened, and human error can be prevented, so that the quality of the program can be improved and labor costs can be further reduced. By doing so, it is possible to reduce the cost for creating a program.

[0025]

According to the present invention, the conversion work from the specification of the scenes program described in the time chart form to the sequence program represented by the ladder diagram can be automatically performed, so that the program can be developed. The period can be shortened, the cost for program creation can be reduced, and the program conversion process is fully automated, reducing the chance of human error and ensuring high-quality programs. It can also be created.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a conversion rule 1 stored in a rule storage unit 52 of the embodiment shown in FIG.

3 is a diagram for explaining a conversion rule 2 stored in a rule storage unit 52 of the embodiment of FIG.

FIG. 4 is a diagram for explaining a conversion rule 3 stored in a rule storage unit 52 of the embodiment shown in FIG.

5 is a diagram showing a sequence specification of a time chart description applied to the embodiment of FIG.

6 is a diagram showing intermediate data obtained as an analysis result of the sequence specification of the time chart description shown in FIG.

7 is a diagram showing a sequence program represented by a ladder diagram generated from the intermediate data shown in FIG.

[Explanation of symbols]

1 ... Input unit, 2 ... Time chart file, 3 ... Specification analysis unit, 4 ... Intermediate data file, 5 ... Program generation unit, 51 ... Conversion unit, 52 ... Conversion rule storage unit, 6 ... Sequence program file, 7 ... Control Department.

Claims (1)

[Claims] 1. Input means for inputting the specifications of a scenes program described in a time chart format, and analysis of the specifications of the scenes program input from this input means to analyze at least a control target, a control start condition, and a control. Specification analysis means for outputting the stop condition and control order as intermediate data, and conversion rule storage means for storing conversion rules for converting the intermediate data output by the specification analysis means into a scenes program represented by a ladder diagram. And a conversion unit for converting the intermediate data output from the specification analysis unit into a sequence program represented by a ladder diagram by referring to the conversion rule stored in the conversion rule storage unit. Sequence program automatic generation device.