JPH11110010A - Method and device for retrieving unnecessary ladder circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically retrieve and display whether or not an unnecessary circuit is included in ladder sequence circuits. SOLUTION: When a sampling frequency is set, a CPU executes ladder sequence circuits (S1). During the execution of the ladder sequence circuits, the ON/OFF frequencies of respective coils present in the ladder sequence circuits are counted (S2). The ON/OFF frequencies of the coils continue to be counted (S3) until the scanning of the ladder sequence circuits reaches the sample frequency set in the step S1. When the scanning reaches the sampling frequency or when a sort instruction is issued, the sequence circuits is rearranged (S4, S5). When the sequence circuits are rearranged in the decreasing order of the ON/OFF frequencies of the coils and a coil which did not turn on at all is included, its ladder sequence circuit is displayed (S6, S7).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an unnecessary ladder circuit search device which can automatically search and display whether or not an unnecessary circuit is included in a stored ladder sequence circuit.

[0002]

2. Description of the Related Art In recent years, many sequence circuits are very complicated, and if the sequence circuits of tens of thousands of lines are uniformly scanned and controlled, it becomes impossible to cope with high-speed control. is there.

For this reason, recently, there has been a method in which a sequence circuit is scanned in accordance with the frequency of operation. For example, a sequence circuit related to a control requiring high-speed processing scans every time, and such a sequence circuit is set to A
A sequence circuit that scans once every two operations of the sequence circuit of group A is group B, and a sequence circuit that scans once every four operations of the sequence circuit of group A is group C. The ladder sequence circuit is configured as follows.

When a ladder sequence circuit having such a configuration is inputted, a circuit requiring the shortest processing in the operation control of the equipment is inputted as an A group, and other signals such as indicator lamps are inputted as B or B. Input as C group.

[0005] Such a method of scanning and grouped inputs ensure desired performance even for equipment having a huge number of sequence circuits.

[0006]

However, if unnecessary circuits are left in the ladder sequence circuit constituted by grouping as described above due to modification or the like, unnecessary processing time is generated. However, there is a problem that the performance of the equipment is reduced.

[0007] In particular, if an unnecessary circuit is left in the group A, the performance of the equipment is greatly reduced.

It is needless to say that such unnecessary circuits can be removed by performing a search operation carefully by a person. However, this operation is performed based on a sequence list printed out, including a coil, a contact, and a use state. The necessity / unnecessity of the sequence circuit must be determined with reference to the above.

[0009] Therefore, it takes a very long time to perform this operation in a huge number of sequence circuits, and there is a possibility that the operation may be overlooked, and there is a problem in terms of operation efficiency and effects.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and automatically searches for unnecessary circuits in a stored ladder sequence circuit while executing whether or not the circuits are unnecessary. It is an object of the present invention to provide a method and a device for searching for an unnecessary ladder circuit that can be displayed in a form.

[0011]

The present invention for achieving the above object is constituted as follows.

According to the first aspect of the present invention, a ladder sequence circuit stored in a storage device is executed, the number of ON / OFF times for each coil of the ladder sequence circuit is counted, and an unnecessary ladder circuit is determined based on the counted number. This is a method for searching for an unnecessary ladder circuit, which is characterized by searching.

According to a second aspect of the present invention, a ladder sequence circuit stored in a storage device is executed, the number of ON / OFF operations for each coil of the ladder sequence circuit is counted, and the coil count is determined based on the counted number. That O
N, rearranged in the order of the number of times of OFF, once ON, OF
This is a method for searching for an unnecessary ladder circuit, which is characterized by searching for a ladder circuit related to a coil that has not been subjected to F.

According to a third aspect of the present invention, there is provided an execution unit for executing a ladder sequence circuit, and the execution unit executes the ladder sequence circuit.
N, counting means for counting the number of turned-off coils for each coil, sorting means for rearranging the coils according to the number of ON and OFF counted by the counting means, and the coil sorted by the sorting means And a search means for searching for an unnecessary ladder circuit from the search device.

According to a fourth aspect of the present invention, there is provided an execution unit for executing a ladder sequence circuit, and the execution unit executes the ladder sequence circuit.
It has a counting means for counting the number of coils in the ladder sequence circuit that has been turned off for each coil, and a display means for displaying a coil whose ON and OFF times counted by the counting means are zero. This is an apparatus for searching for an unnecessary ladder circuit.

According to a fifth aspect of the present invention, there is provided storage means for storing a ladder sequence circuit, execution means for reading and executing the ladder sequence circuit stored in the storage means, Counting means for counting, for each coil, the number of coils in the ladder sequence circuit that has been turned off, sorting means for rearranging the coils in descending order of the number of times of ON and OFF counted by the counting means, and sorting by the sorting means An unnecessary ladder circuit search device, comprising: a search unit that searches for an unnecessary ladder sequence circuit from the obtained coil; and a display unit that displays the unnecessary ladder sequence circuit searched by the search unit.

According to a sixth aspect of the present invention, there is provided an execution means for individually executing a plurality of ladder sequence circuits of the same equipment,
Counting means for counting the ON / OFF frequency of the coil in the ladder sequence circuit for each facility;
Comparing means for comparing the ON / OFF frequency of the coil for each facility counted by the counting means; and ON / OFF of the coil compared by the comparing means.
When the OFF frequency is different from the ON / OFF frequency of the other equipment, there is provided a determining means for determining that there is a sequence failure in any of the ladder sequence circuits including the coil having the different ON / OFF frequency. This is an apparatus for searching for an unnecessary ladder circuit.

[0018]

The method and apparatus for searching for an unnecessary ladder circuit according to the present invention configured as described above have the following effects.

According to the first to third aspects of the present invention, while the sequence circuit is being processed, the O
Since the N and OFF states are detected and unnecessary ladder circuits are searched from the ON and OFF states, unnecessary circuits can be easily searched for even a large number of ladder sequence circuits, thereby deteriorating equipment performance. Can be prevented.

Moreover, since the search for the unnecessary ladder circuit can be performed while executing the sequence, the search can be performed while the equipment is operating.

According to the fourth and fifth aspects of the present invention, the searched unnecessary ladder circuits are displayed, so that the unnecessary circuits can be seen at a glance, and the work of deleting the unnecessary circuits becomes easy.

According to the sixth aspect of the invention, the sequence failure is found by comparing the ON / OFF state of the coils of the ladder sequence circuit of the same equipment, so that not only the unnecessary ladder circuit but also the sequence Can be found easily.

Therefore, it can be used as important data for investigating the cause of a failure whose cause is difficult to understand (a failure that occurs only occasionally).

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method and an apparatus for searching for an unnecessary ladder circuit according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an apparatus for implementing the present invention.

The sequencer 10 is provided with a RAM 30. The RAM 30 stores ladder sequence circuits classified into three groups A, B, and C according to the frequency of operation. In another area of the RAM 30, registers A to H are set.

The register A stores the coil address, and the register B stores the ON / OFF status of the register A. Register C has the previous ON and OF of register A
The F status is stored, and the value of the exclusive OR of the register B and the register C is stored in the register D. Register E stores the total count value when the value of register D is 1, and register F stores the sample value. A fixed value 0 is stored in the register G. In the register H, the register F and the register E are compared, and coil addresses having the same value are sequentially stored.

The CPU 20 executes a ladder sequence circuit stored in the RAM 30 and outputs a count signal to each register set in the RAM 30. Also,
The value of each register is compared via the CPU of the other sequencer controlling the same equipment to determine the presence of a defective sequence.

The terminal device 40 has a display function of displaying a searched unnecessary ladder sequence, a coil that has never been turned on, the presence of a defective sequence, and an input function of inputting the number of times of sampling. It is.

Next, the method of the present invention and the operation of the apparatus shown in FIG. 1 will be described in detail with reference to the flowcharts of FIGS.

The flowchart shown in FIG. 2 is a main flowchart showing the processing of the present invention.

When the number of times of sampling is set by the terminal device 40, the CPU 20 executes the ladder sequence circuit stored in the RAM 30 (S1).

During execution of the ladder sequence circuit, the CPU 20 counts the number of ON and OFF times for each coil present in the ladder sequence circuit. This count value is stored in the register E (S2).

The ON / OFF count of this coil is
The scan of the ladder sequence circuit is performed until the number of samples set in the step S1 is reached (S3).

When the number of times of scanning reaches the number of times of sampling, the sequence circuits are rearranged in descending order of the number of times the coil is turned on and off. It should be noted that, even when an instruction to arrange the coils in the order of frequency with the largest number of ON and OFF times before the number of samples is reached, that is, a sort instruction is issued from the CPU 20, the sequence circuits are similarly rearranged (S4, S5) ).

As a result of rearranging the sequence circuits in descending order of the number of times the coil is turned on and off, if there is a ladder sequence circuit including a coil that is never turned on, the ladder sequence circuit is unnecessary. Therefore, the CPU 20 transmits the circuit to the terminal device 40
(S6, S7).

FIG. 3 is a flowchart showing the counting process of the register E, and is a subroutine flowchart of the step S2 in FIG.

As shown in FIG.
All coils included in the ladder sequence circuit stored in M30 are listed and stored.

The register B stores ON of all the listed coils at the time of the current scan,
The OFF state is stored. ON status is 1 and OF
The state of F is represented by 0.

The register C stores ON / OFF of all the listed coils during the previous scan.
The state is stored. The ON state is represented by 1, and the OFF state is represented by 0.

The result of the ladder sequence processing performed by the CPU 20 (S11), the exclusive OR of the register B and the register C is calculated (S12), and if the result is 1, the count value of the register E is reduced by one. The value is incremented (S13, S14).

The above processing is performed for all the coils of the ladder sequence circuit each time one scan is performed (S15).

The reason why the count of the register E is increased by taking the exclusive OR of the register B and the register C is that the ON / OFF state of each coil at this time is the O / O state of the previous coil.
In the case of changing from the N, OFF state, for example, in the case of Y001, Y004, Y005 in FIG. 5, the ON / OFF state of the coil is determined by utilizing the fact that the exclusive OR of each coil becomes 1. This is because a change in the OFF state can be recognized.

FIG. 4 is a flowchart showing the sort processing of the register E, and is a subroutine flowchart of the step S5 in FIG.

The O of each coil counted during the scan
When the N and OFF frequencies are like the values in the register E as shown in FIG. 5, the coils are rearranged in descending order of the values.

A sample value (for example, 10
0), register G is filled with a value of 0, and register E is
Contains a count value (S21, S22).

The register F and the register E having the same value are put into the register H (S23). When there is no longer any register having the same value in the register F and the register E (S24), the values in the register F and the register G are compared (S25). Is performed (S26). When the values of the register F and the register G become equal, the rearrangement ends.

Although not shown in the above flow chart, when there are a plurality of facilities controlled by the same ladder sequence program, the ON / OFF states of the coils of the ladder sequence circuit of each facility are mutually determined. By comparing, it is possible to find a sequence defect existing in the ladder sequence circuit controlling each facility.

This is because if there is no sequence failure, the ON and OFF states of the coils of the ladder sequence circuit of any equipment should be exactly the same.

This processing is performed by comparing the value of the frequency counter of another facility with the value of the frequency counter of another facility by the CPU of each facility. However,
Of course, the same number of samplings must be set for each facility.

As described above, according to the present invention, as a result of executing the ladder sequence program as shown in FIG. 6 by the number of samples, the order is switched as shown in FIG. 7 according to the ON / OFF frequency of the coil. Can be

In FIG. 7, A, B, and C indicate groups. A group with the most frequent ON / OFF frequency of the coil is in the A group, the next most is in the B group, and the next most is in the B group. Are classified into the C group. Therefore, if the ladder sequence circuit of each group is printed and checked from the circuit printed at the bottom of the group, unnecessary circuits can be easily found. Of course, in the device of the present invention, only the unnecessary circuits are displayed on the terminal device 40, so that the presence or absence of the unnecessary circuits can be more easily confirmed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a device of the present invention.

FIG. 2 is a flowchart showing the operation of the device of the present invention.

FIG. 3 is a flowchart showing the operation of the device of the present invention.

FIG. 4 is a flowchart showing the operation of the device of the present invention.

FIG. 5 is a diagram for explaining the operation of the device of the present invention.

FIG. 6 is a diagram for explaining the operation of the device of the present invention.

FIG. 7 is a diagram for explaining the operation of the device of the present invention.

[Explanation of symbols]

 10: sequencer, 20: CPU, 30: RAM, 38: frequency counter, 40: terminal device.

Claims (6)

[Claims] 1. A ladder sequence circuit stored in a storage device is executed, an ON / OFF count of each coil of the ladder sequence circuit is counted, and an unnecessary ladder circuit is searched from the count. How to search for unnecessary ladder circuits. 2. A ladder sequence circuit stored in a storage device is executed, the number of ON / OFF times for each coil of the ladder sequence circuit is counted, and the coil is turned on / off based on the count number. A method for retrieving an unnecessary ladder circuit, wherein the ladder circuits are rearranged in descending order and a ladder circuit related to a coil that has never been turned ON and OFF is searched. 3. An execution unit for executing a ladder sequence circuit, a counting unit for counting the number of coils turned on and off by the execution unit for each coil, and an ON / OFF counted by the counting unit.
An unnecessary ladder circuit search device, comprising: sorting means for rearranging the coils according to the number of times; and search means for searching for unnecessary ladder circuits from the coils sorted by the sorting means. 4. An execution unit for executing a ladder sequence circuit, a counting unit for counting the number of coils in the ladder sequence circuit turned on and off by the execution unit for each coil, ON, OFF
Display means for displaying a coil whose number of times is 0. A search device for unnecessary ladder circuits. 5. A storage unit storing a ladder sequence circuit, an execution unit for reading and executing the ladder sequence circuit stored in the storage unit, and the ladder sequence circuit turned on and off by the execution unit. Counting means for counting the number of coils in each coil, ON, OFF counted by the counting means
Sorting means for rearranging the coils in descending order of frequency, search means for searching for unnecessary ladder sequence circuits from the coils rearranged by the sort means, and display for displaying the unnecessary ladder sequence circuits searched for by the search means Means for retrieving unnecessary ladder circuits. 6. An execution means for individually executing a plurality of ladder sequence circuits of the same equipment, a counting means for counting the ON / OFF frequency of a coil in the ladder sequence circuit for each equipment, and a counting means for counting the frequency. Means for comparing the ON / OFF frequency of the coil for each facility, and ON / OFF of the coil compared by the comparing means.
When the frequency is different from the ON / OFF frequency of the other equipment, there is provided a judging means for judging that there is a sequence defect in any of the ladder sequence circuits including the coil having the different ON / OFF frequency. Search device for unnecessary ladder circuits.