CN105975093A - Keyboard dot matrix acquisition device and method based on PLC (Programmable Logic Controller) - Google Patents
Keyboard dot matrix acquisition device and method based on PLC (Programmable Logic Controller) Download PDFInfo
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- CN105975093A CN105975093A CN201610276323.2A CN201610276323A CN105975093A CN 105975093 A CN105975093 A CN 105975093A CN 201610276323 A CN201610276323 A CN 201610276323A CN 105975093 A CN105975093 A CN 105975093A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
Abstract
The invention discloses a keyboard dot matrix acquisition device based on a PLC (Programmable Logic Controller). The keyboard dot matrix acquisition device comprises a keyboard and the PLC, wherein each key signal output interface is independently connected with at least two different input ends on the PLC, and a corresponding connection relationship between each key signal output interface and the input ends on the PLC are different. Each key signal output interface of the keyboard dot matrix is independently connected with two different input ends on the PLC, and the PLC only requires a plurality of input ends to completely distinguish a plurality of output interfaces of the keyboard dot matrix to realize the signal acquisition of the keyboard dot matrix. Since the PLC directly detects the input ends, the intermediate links of signal transmission including a single chip microcomputer and the like do not need to be set so as to effectively avoid interference and loss caused by that the single chip microcomputer and the PLC are communicated, the instantaneity of signal transmission is improved, and cost is effectively lowered.
Description
Technical field
The present invention relates to the communications field, particularly relate to keyboard dot matrix signal harvester based on PLC.
Background technology
Keyboard is man-machine dialogue equipment main in the electronic products such as computer, mobile phone, POS.Now with a lot of touch screen type keyboards, it passes through programming realization button random distribution, but the mode using programming realization is easily become the instrument stealing privacy of user by utilizations such as hackers, so in the case of some relate to high secret degree, such as relating in the case of finance, safety, the keyboard with physical button has wider application.
The logic circuit of physical button keyboard provides the matrix arrangement mode of button, and existing matrix keyboard circuit is used mostly single-chip processor i/o mouth to carry out keyboard scan to control the key part of keyboard.Existing 4 × 4 matrix keyboard circuits, as it is shown in figure 1, include 4 × 4 buttons of 4 row 4 row arrangements, 4 resistor R1-R4,2 × 4 I/O mouths.The like, N N matrix keyboard circuit, then need 2N I/O mouth.In matrix keyboard circuit, N root line and N root alignment intersect places formation N × N number of cross point, and each cross point arranges a button.The two ends of button connect with corresponding line and alignment respectively, and every line and an I/O mouth connect.Setting gradually I/O mouth is low level input port, and when pressing without button, alignment disconnects with line, and alignment is high level state；When there being button to press, the alignment that button is corresponding is connected acquisition one low level with this line, and then determines the row residing for button, thus the position of key range.
Matrix keyboard circuit generally uses rank scanning method to determine the column locations by purgation button place.Rank scanning method refers to: the I/O mouth corresponding to the line of keyboard is set to delivery outlet, and the I/O mouth corresponding to alignment is set to input port；When scanning, in turn delivery outlet being set to low level, other input port is set to high level；Read the level state of input port, and the button that the level change judgement occurred according to input port is pressed again.Using this keyboard circuit, be 2N as controlled the I/O mouth number of keyboard, maximum number of keys is N × N.
As it is shown in figure 1, currently existing scheme is in implementation process, due to the input port negligible amounts of PLC, signal needs first to gather the change of dot matrix keyboard I/O level through single-chip microcomputer, passes to PLC the most again, and period signal is through single-chip microcomputer and PLC communication and line transmission.This mode easily causes interference and the loss of signal, it addition, because the mode of input signal scanning is dot matrix scan round, then through single-chip microcomputer and PLC communication, so can also be weak in terms of real-time.And circuit is various on physical device, line length is longer, and interference source is numerous, easily interferes signal.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of keyboard dot matrix signal harvester based on PLC, need not single-chip microcomputer, PLC is directly connected the collection that can be achieved with keyboard signal with the outfan interface of dot matrix keyboard, circuit structure is simple, efficiently avoid the signal interference problem that single chip communication causes.
The present invention is achieved in that keyboard dot matrix signal harvester based on PLC, including keyboard and programmable logic controller (PLC) PLC, described keyboard includes multiple button and push button signalling output interface corresponding with each button respectively, described programmable logic controller (PLC) PLC includes multiple input, the input connection that each described push button signalling output interface is different from least two on described programmable logic controller (PLC) PLC respectively, each push button signalling output interface differs with the connection corresponding relation of input on PLC.
Further, each described push button signalling output interface includes two switches linked, the input connection that two described switches are different from least two on described programmable logic controller (PLC) PLC respectively.
Further, two described switches pass through wired in series.
Further, each described push button signalling output interface also includes two diodes, each described diode and a described switch series connection, one end of each described switch is connected with power supply, the other end connects with the positive pole of corresponding diode, and the negative pole of described diode is connected with the input of programmable logic controller (PLC) PLC.
Further, each described push button signalling output interface includes a switch, the input connection that described switch is different from least two on described programmable logic controller (PLC) PLC respectively.
Further, each described push button signalling output interface also includes that a diode, described diode are connected with described switch, and one end of described switch is connected with power supply, the other end is connected with the positive pole of diode, and the negative pole of described diode is connected with the input of programmable logic controller (PLC) PLC.
Further, each described push button signalling output interface two different inputs upper from described programmable logic controller (PLC) PLC respectively connect, described programmable logic controller (PLC) PLC(1) the number N of input and the number of keys M of described keyboard meet following relation: 2N-1≥M.Further, the number of described button is 32, and the number of the input of described programmable logic controller (PLC) PLC is no less than 6.
Present invention also offers a kind of keyboard dot matrix signal acquisition method based on PLC based on said apparatus, comprise the following steps:
S1, annexation according to the button of keyboard with the input of programmable logic controller (PLC) PLC, arrange the identification code of each button；
S2, programmable logic controller (PLC) PLC scan round input, when the output result that input is corresponding is identical with the identification code of button, it is determined that this button is pressed.
Implement the present invention, have the advantages that
(1) in the present invention, different from least two on programmable logic controller (PLC) PLC respectively for each push button signalling output interface of keyboard dot matrix input being connected, the number N of the input of described programmable logic controller (PLC) PLC and the number of keys M of described keyboard have only to meet following relation: 2N-1>=M or 2N>=M × X, say, that PLC has only to trivial several input, it is possible to multiple output interfaces of keyboard dot matrix are distinguished completely, it is achieved the signals collecting to keyboard dot matrix.Directly detect dot matrix I/O, it is not necessary to the intermediate link of the signal such as single-chip microcomputer transmission is set due to PLC, it is thus possible to be prevented effectively from signal owing to single-chip microcomputer and PLC communication are interfered and lose, improve the real-time that signal transmits, and effectively reduce cost.
(2) each push button signalling output interface of the present invention includes two switches linked, two described switch two different inputs upper from described programmable logic controller (PLC) PLC respectively connect, when one of them switch breaks down, another one switch can also normally work, it is effectively improved the service life of keyboard, improves the stability of device.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art and advantage, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of keyboard harvester in prior art；
Fig. 2 is the schematic diagram of the device that the embodiment of the present invention one provides；
In figure: 1-programmable logic controller (PLC) PLC, 2-push button signalling output interface, 3-power supply.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into the scope of protection of the invention.
Embodiment one:
The invention provides a kind of keyboard dot matrix signal harvester based on PLC, need not single-chip microcomputer, PLC is directly connected the collection that can be achieved with keyboard signal with the outfan interface of dot matrix keyboard, and circuit structure is simple, efficiently avoid the signal interference problem that single chip communication causes.
The present invention is achieved in that keyboard dot matrix signal harvester based on PLC, including keyboard and programmable logic controller (PLC) PLC1, described keyboard includes multiple button and push button signalling output interface 2 corresponding with each button respectively, described programmable logic controller (PLC) PLC1 includes multiple input, the input connection that each described push button signalling output interface 2 is different from least two on described programmable logic controller (PLC) PLC1 respectively, each push button signalling output interface differs with the connection corresponding relation of input on PLC.As in figure 2 it is shown, the present embodiment includes, as a example by six press keys, being explained in detail the solution of the present invention by keyboard, in the present embodiment, each described push button signalling output interface 2 two different inputs upper from described programmable logic controller (PLC) PLC1 respectively connect.It will be understood by those skilled in the art that in different application scenarios, the number of keys in keyboard can be arbitrary number, is all applicable to the present invention, and muliple keyboards number of the present invention is not specifically limited.It should be noted that, in concrete application scenarios, each described push button signalling output interface can connect by different inputs multiple from described programmable logic controller (PLC) PLC respectively, such as three, four etc., as long as each push button signalling output interface differs with the connection corresponding relation of input on PLC, each push button signalling output interface can be made a distinction from the input of PLC and all be applicable to the present invention.
Each described push button signalling output interface 2 includes that two switches linked and two diodes, two described switch two different inputs upper from described programmable logic controller (PLC) PLC1 respectively connect.Two described switches pass through wired in series.Each described push button signalling output interface also includes two diodes, each described diode and a described switch series connection, one end of each described switch is connected with power supply 3, the other end connects with the positive pole of corresponding diode, and the negative pole of described diode is connected with the input of programmable logic controller (PLC) PLC.The number N of the input of described programmable logic controller (PLC) PLC and the number of keys M of described keyboard meet following relation: 2N-1≥M。
Certainly, if each described push button signalling output interface respectively with on described programmable logic controller (PLC) PLC multiple (such as, X) different inputs is when connecting, each described push button signalling output interface 2 can include X the switch linked and X diode, and the number of diode is corresponding with the number of described switch.The negative pole of multiple diodes connects the input of X PLC.Certainly, each described push button signalling output interface 2 can still include two switches linked and two diodes, and the number of diode is corresponding with the number of described switch.The negative pole of two diodes connects the input of X PLC.
When the input that each described push button signalling output interface is different from X on described programmable logic controller (PLC) PLC (X >=2) respectively connects, the number N of the input of described programmable logic controller (PLC) PLC and the number of keys M of described keyboard meet following relation: 2N≥M×X。
As a example by the present embodiment, switch K1, K2, K3, K4, K6, K6 respectively that 6 buttons are corresponding, as in figure 2 it is shown, the switch of all corresponding two linkages of K1, K2, K3, K4, K6, K6.When corresponding button is pressed, the switch Guan Bi of two linkages.The input of programmable logic controller (PLC) PLC1 is respectively X1, X2, X3, X4, X5.In the present embodiment, the number of keys M of described keyboard is 6, and the number N of the input of programmable logic controller (PLC) PLC1 is 5, it is evident that this number satisfied following relation is set: 2N-1≥M。
In Fig. 2, a switch of K1 is connected with the positive pole of diode DK11, and another switch is connected with the positive pole of diode DK12；One switch of K2 is connected with the positive pole of diode DK21, and another switch is connected with the positive pole of diode DK22；One switch of K3 is connected with the positive pole of diode DK31, and another switch is connected with the positive pole of diode DK32；One switch of K4 is connected with the positive pole of diode DK41, and another switch is connected with the positive pole of diode DK42；One switch of K5 is connected with the positive pole of diode DK51, and another switch is connected with the positive pole of diode D52；One switch of K6 is connected with the positive pole of diode DK61, and another switch is connected with the positive pole of diode DK62；
The negative pole of diode DK11 is connected with X1, and the negative pole of diode DK12 is connected with X4；The negative pole of diode DK21 is connected with X1, and the negative pole of diode DK22 is connected with X5；The negative pole of diode DK31 is connected with X2, and the negative pole of diode DK32 is connected with X4；The negative pole of diode DK41 is connected with X2, and the negative pole of diode DK42 is connected with X5；The negative pole of diode DK51 is connected with X3, and the negative pole of diode DK52 is connected with X4；The negative pole of diode DK61 is connected with X3, and the negative pole of diode DK62 is connected with X5.
Present invention also offers a kind of keyboard dot matrix signal acquisition method based on PLC based on said apparatus, comprise the following steps:
S1, annexation according to the button of keyboard with the input of programmable logic controller (PLC) PLC, arrange the identification code of each button；
S2, programmable logic controller (PLC) PLC scan round input, when the output result that input is corresponding is identical with the identification code of button, it is determined that this button is pressed.
Assembly of the invention work process is as follows:
Obtain the number of keys M of keyboard, according to formula 2N>=M × X, determines the number N of input required on programmable logic controller (PLC) PLC；Certainly, in order to receive other input signals in addition to keyboard dot matrix, 2NThe value of-M × X is more preferably greater than the number of other input signals.Wherein, X is the linking number of each push button signalling output interface input different from PLC.
Inputs different from least two on described programmable logic controller (PLC) PLC respectively for each described push button signalling output interface is connected.
The annexation of the input of the button according to keyboard and programmable logic controller (PLC) PLC, the identification code of each button is set, such as, if definition X1-X5 is that the low level of binary number is to high-order respectively, one switch of K1 is connected with the positive pole of diode DK11, and another switch is connected with the positive pole of diode DK12；The negative pole of diode DK11 is connected with X1, and the negative pole of diode DK12 is connected with X4；Then corresponding for K1 identification code is 01001, and when the button that K1 is corresponding is pressed, PLC is able to detect that input have input 01001, thus judges that button corresponding for K1 is pressed.
Programmable logic controller (PLC) PLC scan round input, when the output result that input is corresponding is identical with the identification code of button, it is determined that this button is pressed.Programmable logic controller (PLC) PLC scan round input, refers to programmable logic controller (PLC) PLC scan input end at predetermined intervals, reads the state of input, it is achieved the collection to keyboard signal.
Embodiment two:
Present embodiments provide a kind of keyboard dot matrix signal harvester based on PLC, including keyboard and programmable logic controller (PLC) PLC1, described keyboard includes multiple button and push button signalling output interface 2 corresponding with each button respectively, described programmable logic controller (PLC) PLC1 includes multiple input, the input connection that each described push button signalling output interface is different from least two on described programmable logic controller (PLC) PLC respectively.
Being with embodiment one difference, in the present embodiment, each described push button signalling output interface includes a switch, the input connection that described switch is different from least two on described programmable logic controller (PLC) PLC respectively.
Each described push button signalling output interface also includes a diode, described diode is connected with described switch, one end of described switch is connected with power supply, and the other end is connected with the positive pole of diode, and the negative pole of described diode is connected with the input of programmable logic controller (PLC) PLC.
When the number of button is 32, the number of the input of described programmable logic controller (PLC) PLC is no less than 6, for example, it may be 11.
Implement the present invention, have the advantages that
(1) in the present invention, different from least two on programmable logic controller (PLC) PLC respectively for each push button signalling output interface of keyboard dot matrix input being connected, the number N of the input of described programmable logic controller (PLC) PLC and the number of keys M of described keyboard have only to meet following relation: 2N-1>=M or 2N>=M × X, say, that PLC has only to trivial several input, it is possible to multiple output interfaces of keyboard dot matrix are distinguished completely, it is achieved the signals collecting to keyboard dot matrix.Directly detect dot matrix I/O, it is not necessary to the intermediate link of the signal such as single-chip microcomputer transmission is set due to PLC, it is thus possible to be prevented effectively from signal owing to single-chip microcomputer and PLC communication are interfered and lose, improve the real-time that signal transmits, and effectively reduce cost.
(2) each push button signalling output interface of the present invention includes two switches linked, two described switch two different inputs upper from described programmable logic controller (PLC) PLC respectively connect, when one of them switch breaks down, another one switch can also normally work, it is effectively improved the service life of keyboard, improves the stability of device.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. keyboard dot matrix signal harvester based on PLC, it is characterized in that, including keyboard and programmable logic controller (PLC) PLC(1), described keyboard includes multiple button and push button signalling output interface (2) corresponding with each button respectively, described programmable logic controller (PLC) PLC(1) include multiple input, each described push button signalling output interface (2) respectively from described programmable logic controller (PLC) PLC(1) input that upper at least two is different connects, each push button signalling output interface differs with the connection corresponding relation of input on PLC.
Keyboard dot matrix signal harvester based on PLC the most according to claim 1, it is characterized in that, each described push button signalling output interface (2) includes two switches linked, two described switches respectively from described programmable logic controller (PLC) PLC(1) input that upper at least two is different connects.
Keyboard dot matrix signal harvester based on PLC the most according to claim 2, it is characterised in that two described switches pass through wired in series.
Keyboard dot matrix signal harvester based on PLC the most according to claim 2, it is characterized in that, each described push button signalling output interface (2) also includes two diodes, each described diode and a described switch series connection, one end of each described switch is connected with power supply (3), the positive pole of the other end and corresponding diode connects, the negative pole of described diode and programmable logic controller (PLC) PLC(1) input be connected.
Keyboard dot matrix signal harvester based on PLC the most according to claim 1, it is characterized in that, each described push button signalling output interface (2) includes a switch, described switch respectively from described programmable logic controller (PLC) PLC(1) input that upper at least two is different connects.
Keyboard dot matrix signal harvester based on PLC the most according to claim 5, it is characterized in that, each described push button signalling output interface (2) also includes a diode, described diode is connected with described switch, one end of described switch is connected with power supply (3), the other end is connected with the positive pole of diode, the negative pole of described diode and programmable logic controller (PLC) PLC(1) input be connected.
Keyboard dot matrix signal harvester based on PLC the most according to claim 1, it is characterized in that, each described push button signalling output interface (2) respectively from described programmable logic controller (PLC) PLC(1) upper two different inputs connect, described programmable logic controller (PLC) PLC(1) and the number N of input and the number of keys M of described keyboard meet following relation: 2N-1≥M。
Keyboard dot matrix signal harvester based on PLC the most according to claim 1, it is characterised in that the number of described button is 32, described programmable logic controller (PLC) PLC(1) the number of input no less than 6.
9. keyboard dot matrix signal acquisition method based on PLC based on described device arbitrary in claim 1-8, it is characterised in that comprise the following steps:
S1, annexation according to the button of keyboard with the input of programmable logic controller (PLC) PLC, arrange the identification code of each button；
S2, programmable logic controller (PLC) PLC scan round input, when the output result that input is corresponding is identical with the identification code of button, it is determined that this button is pressed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610276323.2A CN105975093A (en) | 2016-04-29 | 2016-04-29 | Keyboard dot matrix acquisition device and method based on PLC (Programmable Logic Controller) |
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| CN201610276323.2A CN105975093A (en) | 2016-04-29 | 2016-04-29 | Keyboard dot matrix acquisition device and method based on PLC (Programmable Logic Controller) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161668A (en) * | 2020-08-25 | 2021-01-01 | 山东中车华腾环保科技有限公司 | Water tank liquid level detection system, water tank system, method and application |
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| CN101751141A (en) * | 2008-12-12 | 2010-06-23 | 深圳富泰宏精密工业有限公司 | Keyboard circuit |
| CN202600622U (en) * | 2011-12-21 | 2012-12-12 | 陕西理工学院 | Novel matrix type keyboard circuit |
| CN205594591U (en) * | 2016-04-29 | 2016-09-21 | 厦门徕钿数控自动化有限公司 | Keyboard dot matrix signal pickup assembly based on PLC |
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| CN2132203Y (en) * | 1992-07-03 | 1993-05-05 | 上海市电器技术研究所 | Multiple input programmable controller |
| CN2682479Y (en) * | 2003-12-19 | 2005-03-02 | 上海海运学院 | Computer I/O port multiposition switch data information input control circuit |
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| CN112161668A (en) * | 2020-08-25 | 2021-01-01 | 山东中车华腾环保科技有限公司 | Water tank liquid level detection system, water tank system, method and application |
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Application publication date: 20160928 |