JPH045705A - Progressive sequence control device - Google Patents

Abstract

PURPOSE:To prevent the stepping of step-up due to the stepping condition of mis-detection by counting and comparing the set number of times of scanning and the number of times of the scanning of a sequence program, and executing the stepping of the step-up at the time of coincidence. CONSTITUTION:The stepping type sequence control of the stepping condition of a ladder program is set in a step-up counter 18 from a CPU 22 through an AND gate 20, and a reset signal Sr is inputted to a scanning counter 14. The number of times of scanning is set by the number of times of scanning setting device 12, and the number of times of scanning of the sequence program is counted by the counter 14. The set number of times of scanning and the number of times of scanning of the sequence program are compared by a comparator 16, and at the time of the coincidence, a coincidence signal Si is sent. By inputting the signal Si to the counter 18, the stepping of the step-up is executed. Thus, the stepping of the step-up due to the stepping condition of the mis- detection apt to occur at the time of the re-composition of sequence by changing a pin on a pin board matrix and so on can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a step-type sequence control device in which stepping is suitably executed without erroneous step-up. By counting and comparing the set number of scans, including the number of scans at which the process of matching becomes stable, and the number of scans of the sequence program, the step-up is executed at the match, and the bins are displayed on the bin board matrix. This effectively prevents the execution of a step-up step under the step condition of false detection, which is said to be likely to occur when the sequence is rearranged by replacing the This eliminates the need for any recombination.

[Prior art] Conventionally, when step conditions match, step-up is performed.
In a stepwise sequence controller that executes steps of 110 to 110 when using a binboard matrix
timing deviation), ladder program scan time,
That is, an erroneous step-up step may be performed under the step condition due to erroneous detection in a transient state.

For example, when processing actuation elements 10096-10110, a ladder program schematically shown in FIG. 3 is executed. In this case, step to step 1 and e.g. output 9
7 is turned on, and then the signals of the operating elements 10096 to 10110 corresponding to the bin board matrix are input,
The process corresponding to that input is executed, and after confirming its completion,
Return to output 97.

During the subsequent input processing of the actuating elements 10096 to 10110, the output 97 may not be turned on in the above-mentioned transient state, and therefore the input signals of the actuating elements 10096 to 10110 cannot be taken in, and the processing of step 1 is not performed. It is determined that there is no such thing and proceeds to the next step 2.

In this case, in order to adjust the signal delay between 110 or the timing of the scan time of the ladder program,
Well-known timer processing means are provided at necessary locations in the ladder program, and the processing time is extended here to match the above-mentioned timing. This prevents erroneous detection of step conditions and allows the step-up step to be executed normally.

[Problems to be Solved by the Invention] However, in the walkway type sequence control device according to the above-mentioned conventional technology, it is difficult to control the lengthening of the timing adjustment processing time in order to prevent erroneous detection of the step condition. It differs depending on the ladder program corresponding to the device used. Therefore, when the ladder program is rearranged to cope with a change in the control device or a change in its sequence, the timing adjustments to extend the processing time do not match, resulting in incorrect step-up steps. Execution of this method causes the controlled device to malfunction, which has the disadvantage that it is not possible to change the controlled device or the content of control.

The present invention has been made in view of the above drawbacks, and prevents execution of step-up increments based on increment conditions based on false detections that are likely to occur when sequences are rearranged by replacing bins on a bin board matrix, etc. Furthermore, it is an object of the present invention to provide a step-by-step sequence control device for a sequence program that has excellent flexibility in recombining ladder programs when changing the controlled device or changing the sequence thereof, and further allows the sequence to be completed in the shortest time. purpose.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the stepwise sequence control device of the present invention includes: a setting means for setting the number of scans in the stepwise sequence control; and a stepwise sequence program scanning control device. a counting means for counting the number of times; a comparison means for sending a signal when the set number of scans of the sequence program matches the number of operation scans; and a step-up step is executed when the signal is input. It is characterized by comprising a step-up counter;

[Operation] In the above configuration, the set number of scans, including the number of scans at which the processing is stabilized when the step conditions match, is counted and compared with the number of scans of the sequence program, and when they match, the step is started. A step up is performed.

This effectively prevents step-up increments based on step conditions based on erroneous detections, which are likely to occur when sequences are rearranged by replacement on the binboard matrix, and increases the degree of freedom in rearranging ladder programs. Furthermore, there is no need to use a timer and the sequence program can be completed in the shortest possible time.

[Example] Next, an example of the stepwise sequence control device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the basic configuration according to the embodiment, and FIG.
The figure is an expanded connection diagram showing an actual circuit to which the basic configuration of the present invention is applied.

First, the basic configuration shown in FIG. 1 will be explained.

The example shown in FIG. 1 includes a scan number setter (setting means) 12 for setting the number of scans in stepwise sequence control, and a scan counter (counting means) 1 for counting the number of scans of a sequence program.
4, a comparator (comparison means) 16 that sends out a coincidence signal Si when the number of scans set for forward bending and the number of scans of the sequence program match, and the coincidence signal S1
is input, the step-up counter 18 executes step-up increment, and the AND gate 20
and a CPU 22 that performs step-by-step sequence control, which is the step-by-step conditions for the ladder program.

Next, the operation of the above basic configuration will be explained.

Step-by-step sequence control, which is a step condition for the ladder program, is set from the CPU 22 to the step-up counter 18 via the AND gate 20, and a reset signal Sr is input to the scan counter 14. Then, the number of scans is set by the scan number setter 12. Thereafter, the scan counter 14 counts the number of scans of the sequence program. Next, the comparator 16 compares the set number of scans with the number of scans of the sequence program, and when they match, a match signal S1 is sent out. Next, by inputting the coincidence signal S1 to the step-up counter 18, a step-up increment is executed.

In this way, the set number of scans, including the number of scans at which the process of matching step conditions is stabilized, is counted and compared with the number of scans of the sequence program, and when they match, the number of scans related to step-type sequence control is A step-up advancement is performed.

Next, an explanation will be given using a developed connection diagram of a well-known ladder program shown in FIG.

Here, a configuration corresponding to the basic configuration described above will be explained.

The functions of the scan number setter 12, scan counter 14, and comparator 16 are performed by counter 1 in the figure.

Step-up counter 18 is counter 2 and performs its functions. Furthermore, the control of the CPU 22 corresponds to the stepping conditions of the ladder program.

The operation in such a configuration will be explained.

First, when activated, the step-up counter 30 of the counter 2 increments. This step waits for the condition of the contact 426, and the completion signal 10078 of the sequence set on the pinboard or the setting presence/absence signal 100 of the pinboard
When the contact 426 is turned on by 96, the circuit 422 is further turned on.
turns on.

Then, in the next scan, the scan counter 32 of counter 1 counts up. In this scan, coil 42
2 is ONL, contact 422 is 0FFL, coil 422 is O
FF. In addition, the scan counter will be set to 3 on the next scan.
Input 2 changes from ON to OFF, and no counting is performed.

In this scan, the coil 422 is OFF, so the contact 422 is connected, and now the coil 422 is ON.
do.

During this operation, the scan counter 32 counts up during the scan, and the coil 422 counts up during the scan.
is turned ON, the contact 422 is ○FFL, and the coil 422 is OFF.
Becomes FF. In the next scan, the input of the scan counter 32 changes from ON to OFF, and no counting is performed, and in this scan, the coil 422 turns OFF, and the contact 422
is connected, and the coil 422 is turned on. The operations during this time are repeated.

Then, by repeating the above, the scan counter 32
, that is, the number of sweeps setter 34 of counter 1.
When the preset value is reached, the coil 423 turns on.
do. During this scan, the step-up counter 30 counts up, and the contact 2201 becomes 0FFL, and the contact 220
2 turns on.

Here, the operation of the coil 422 will be explained in detail. It has a coil 422 and a B contact 422 in the same circuit,
When the contact 421 becomes ONL and the coil 422 becomes ON, B
The contacts are opened and the coil 422 is turned off. This operation is performed in two scans.

First, when the contact 421 is turned on in the first scan, the coil 422 is turned on.

In the second scan, the coil 422 is turned on. Here, the B contact 422 is open, and the coil 42
2 turns OFF.

In the third scan, when the contact 421 is ON, the coil 422 is turned ON in the same way as in the first scan. The pulses thus obtained are counted by a scan counter 32.

In this way, 10 steps up to the contact 2210 are performed, and then when the contact 2211 is turned ON, the contact 2211 at the reset input end of the scan counter 32 becomes 0FFL,
The step-up counter 30 is reset and returns to the initial state.

In this way, as in the basic configuration described above, when the step conditions match, the processing becomes stable.The set number of scans, including the number of scans, and the number of scans of the sequence program are counted and compared, and when they match. A step-up advancement is performed.

[Effects of the Invention] As described above, according to the control device for a stepwise sequencer of the present invention, the setting means for setting the number of scans in stepwise sequence control and the counting means for counting the number of scans of a sequence program are provided. , a comparison means for sending a signal when the set number of scans and the number of operation scans match, and a step-up counter for executing step-up, and the signal is input to the step-up counter. This feature is characterized in that step-up progress is executed.

This effectively prevents step-up increments due to erroneous detection increments that are likely to occur when the sequence is rearranged by replacing pins on the bin board matrix or the like. In addition, changes to the equipment controlled by it,
Furthermore, the ease of rearranging ladder programs, etc. when changing control sequences is improved, the sequence can be completed in the shortest possible time, and malfunctions of devices controlled using ladder programs are effectively prevented. and benefits can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of a stepwise sequence control device according to the present invention, and FIG. 2 is an expanded connection showing an actual working circuit to which the basic configuration shown in FIG. 1 is applied. FIG. 3 is a diagram used to explain the prior art. 2...Scan number setter 4...Scan counter 6...Comparator 8...Step up counter 0...AND gate 2...CPU 0...Step up counter 2...Scan Counter 4... Scan number setter r... Reset signal l... Match signal FIG, 1 FIG, 3

Claims (1)

[Claims] (1) A setting means for setting the number of scans in the stepwise sequence control, a counting means for counting the number of scans of the sequence program, and a signal when the set number of scans of the sequence program matches the number of operation scans. A step-by-step sequence control device comprising: a comparison means for sending out a step-up step; and a step-up counter for executing step-up steps when the signal is input.