JPH07199800A - Processor for switch signal - Google Patents

Abstract

PURPOSE:To accurately judge that a changeover switch is switched over, and the conditions of on/off of respective contacts after switching, and output the data related to them. CONSTITUTION:The data showing the on/off conditions of respective contacts of the changeover switch are sampled at a prescribed period, and the on data in the data are stored in storage means (internal relays M100, M101 and M103). When the on data with two contacts are stored in the storage means, a timer 50 starts the counting for a prescribed time longer than the sampling period, and when the counting ends, a storage content in the storage means is erased, and the data showing that the switch is switched over and the sampling data, are outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for processing an output signal of a changeover switch.

[0002]

2. Description of the Related Art FIG. 1 shows a connection mode between respective contacts 101, 102 and 103 of a rotary switch 100 and a personal computer 300. In FIG. 1, a contact 104 of the rotary switch 100 has contacts 101, 102 and 103. When connected to, the photocouplers FC301, FC302, and FC303 provided in the input section of the personal computer 300 are turned on.

Therefore, the personal computer 300 can recognize the on / off state of the contacts 101-103 based on the outputs of these photocouplers FC301-FC303.

[0004]

By the way, for example, if the rotary switch 10 is provided on the operation panel of a machine tool, the signal lines 201, 202 and 203 connecting the switch 10 and the personal computer 300 are considerably formed. As a result, the electric resistance and stray capacitance of the signal line act as a signal delay element.

In this case, since the input signal (on data) to the personal computer 300 is delayed, the personal computer 300 may erroneously determine the on / off state of each of the contacts 101, 102 and 103.

In view of such a situation, an object of the present invention is to accurately judge whether the changeover switch has been changed and the on / off state of each contact after the changeover, and to output a switch signal for outputting data relating to them. It is to provide a processing device.

[0007]

The present invention comprises means for sampling data indicating the on / off state of each contact of a changeover switch at a predetermined cycle, and storage means for storing on data of the sampled data. A switching judgment means for judging switching of the switch by detecting that the ON data of two contacts are stored in the storage means, and a predetermined time longer than the sampling cycle at the time of judging switching of the switch. A timer for starting time counting, a means for erasing the stored contents of the storage means and outputting the data indicating that the switch has been switched and the sampled data at the time when the timer finishes the time counting. Is equipped with.

[0008]

The switching of the switch is judged based on the ON data of the two contacts stored in the storage means, and at the time of the judgment, the counting of a predetermined time longer than the sampling period is started. Then, when the timing is finished, the storage of the ON data is erased, and the data indicating that the switch is switched and the sampling data are output.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, data indicating the on / off states of the contacts 11, 12 and 13 of the rotary switch 10 are X1, X2 and X3, respectively, and the sequencer 2
Added to 0.

In this embodiment, the rotary switch 10 is provided on the operation panel of the processing machine as an input means of a symbol designating the type (model) of the work to be processed. The sequencer 20 is provided as a means for controlling the processing machine.

The data X1 applied to the sequencer 20
X2 and X3 are input to the input internal circuit 24 via the photocouplers FC-21 to FC-23 provided in the input section of the sequencer 20, and then the internal circuit 24 is input.
It passes through a chattering prevention circuit (not shown) provided in the above and is set to the internal input port.

FIG. 2 is a ladder diagram showing an example of a sequence program for processing the opening / closing data. This program is executed by the CPU (not shown) of the sequencer 20 at a predetermined cycle. The contents executed by this program will be described below.

(Part A) On / off data X1, X2 and X3 are each given a weight for coding. In the section A, these data are sampled and decoded into data indicating the model code, and as a result of the decoding, the internal relays M10, M11 and M13 are selectively operated. Therefore, at the start of the current scan time, for example, if the data X1 indicates the ON state, the relay M10 is activated. The sampling of the above data is executed at each scan time of the sequencer.

(Part B) In part A, internal relay M10,
A process of activating a corresponding one of the internal storage relays M100, M101, and M103 and holding the operating state of the relay itself when one of M11 and M13 is activated (self-holding process) That is, the process of storing the data obtained by the decoding process is executed. Therefore, for example, when the internal relay M10 is operated in the section A, the internal storage relay M100 is self-holding operated.

(C section) AND of signals indicating the open / closed state of the contacts of the relays M100, M101, the relays M100, M1
03 similar relay and relay M101,
First to take the same logical product for the contacts of M103
Processing, the second processing for taking the logical sum of the results of the logical products, and the processing for activating the timer T50 when the logical sum of the second processing is established. Now, in the scan time before the previous scan time, the relay M101 is self-holding operated (this means that the contact 12 of the rotary switch 10 is in the ON state before the start time of the previous scan time. And if the rotary switch 10 is switched from the contact 12 to the contact 11 during the scan time immediately before this,
The self-holding relay M101 maintains its holding state even during the current scan time, while the relay M100 self-holds during the current scan time. Therefore, in this example, at the current scan time,
A logical product is established in the AND circuit constituted by the contacts of the relays M100 and M101, and the switching from the contact 12 to the contact 11 is determined by this. Then, the timer T50 is started in accordance with the establishment of this logical product. Even when the switching from the contact 11 to the contact 12 is executed, the logical product is established in the AND circuit. Also, switching from contact 11 to contact 13 or contact 1
When the switching from 3 to the contact 11 is executed, the AND circuit constituted by the respective contacts of the relays M100 and M103 determines that, and further switching from the contact 12 to the contact 13 or from the contact 13 to the contact. When the switching to 12 is executed, the AND circuit constituted by the contacts of the relays M100 and 103 determines it.

(Part D) When the timer T50 is started, the pulse relay M104 is made operable via its contact, and the time measurement of the timer T50 is finished, and its delay contact K10 is closed. At that time, the pulse relay M104 is activated. Therefore, currently, the relay M1
If 00 and M101 are self-holding, the relays M100 and M101 are released from their self-holding due to the release of their contacts accompanying the operation of relay M104. The delay time of the timer T50 is, for example, 1 of the sequencer 20.
It is set to about 5 times the scan time (for example, 20 ms). Further, the pulse relay M104 has a timer T50.
Will only operate at the scan time when was activated.

(Part E) When the pulse relay 104 operates, the switching display internal relay M16 is connected through its contact.
And activate timer T6, and
A process of holding the operating state of the relay M16 by the relay itself is executed. Further, the processing for releasing the self-holding of the relay M16 is executed at the time point when the timer T6 finishes measuring the time. In addition,
The delay time of the timer T6 is set to, for example, about the same as the delay time of the timer T50, that is, about 5 times the one scan time of the sequencer 20.

(F part) Relays M10, M11 and M1
The data indicating the operating state of No. 3 (decoded data) is set in the internal output port as Y68, Y69 and Y6B, and the data indicating the operating state of the relay M16, that is, whether the contact of the switch 10 is switched or not. A process of setting the data indicating that to YB4 to the internal output port is executed.

The sequencer 20 repeatedly executes the above procedure at the scan cycle ,. The data Y68, Y69, Y6B and YB4 set in the internal output port are transferred to the internal circuit and photocouplers FC1 'and FC1.
Output through 2 ', FC3' and FC4 '.

The personal computer 30 uses the output data Y68,
Y69, Y6B, and YB4 are input via photocouplers FC31, FC32, FC33, and FC34, respectively. When it is determined that the contact of the rotary switch 10 has been switched based on the data YB4, the execution of the program currently being processed is interrupted, and the on / off state of the contacts 11, 12 and 13 at that time is indicated. Take in the data Y68, Y69, Y6B as data designating the branch destination of program re-execution,
Execute the program from the branch destination.

Here, the reason for providing the timer T50 will be described. Now, considering the case where the switch 10 is switched from the contact 11 to the contact 13, in this case, the contact 14 of the switch 10 once contacts the contact 12 and is then connected to the contact 13. Therefore, the timer 50 is started by the output of the AND circuit configured by the contacts of the relay M100 and the relay M101, but at the time when the timer 50 finishes measuring the time, the contact 1 to the contact 13 is
Since the contact of No. 4 has been completed, the data Y68, Y69, Y6B when the data YB4 is output indicate that only the contact 13 is turned on.

As described above, the timer 50 has the switch 10
Is provided for the purpose of ensuring the time at which the switching operation of (1) is finished, strictly speaking, the time when the corresponding photocoupler is turned on after the operation is finished, and therefore, the continuous contact of the contacts during the time period of the timer 50. It is possible to cope with such a switching operation as well as to cope with an operation delay of the photocoupler due to a large length of the signal cable connecting the switch 10 and the sequencer 20.

That is, according to the above embodiment, the data YB
The reliability of the data Y68, Y69, Y6B when 4 is output, that is, the reliability of the data corresponding to the on / off data of each contact 11, 12, and 13 is extremely high, and therefore the personal computer 300 is prevented from being erroneously recognized. be able to.

Further, according to the above-mentioned embodiment, since the above-mentioned operation is obtained by utilizing the sequencer 20 used for controlling machining, there is also an advantage that it is not necessary to modify the program on the personal computer 300 side. can get.

The present invention can be naturally applied not only to a rotary switch but also to a push button switch or the like that selects and operates a plurality of push buttons to switch contacts.

[0026]

According to the present invention, since it is possible to accurately determine whether the changeover switch has been changed and the on / off state of each contact after the changeover, and to output the data relating to them, the changeover switch can be output. It is suitable as a switch signal processing means interposed between a personal computer and a personal computer.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a connection mode between a rotary switch and a sequencer and a connection mode between a sequencer and a personal computer.

FIG. 2 is a ladder diagram illustrating the contents of a program executed by a sequencer.

FIG. 3 is a circuit diagram showing a configuration of an accessory circuit conventionally connected to each contact of a rotary switch.

[Explanation of symbols]

 10 Rotary Switch 11, 12, 13 Contact 14 Contact 20 Sequencer 30 PC

Claims (1)

[Claims] 1. A means for sampling data indicating the on / off state of each contact of a changeover switch at a predetermined cycle, a storage means for storing on data of the sampled data, and two contacts for the storage means. A switching determination means that determines that the switch is switched by detecting that the on-data is stored, and a timer that starts counting a predetermined time longer than the sampling period when the switch is determined to be switched. A switch that erases the stored contents of the storage means and outputs the data indicating that the switch has been switched and the sampled data when the timer finishes measuring time. Signal processing device.