CN105204428A - Expanded circuit and extension method of PLC (programmable logic controller) input points - Google Patents

Expanded circuit and extension method of PLC (programmable logic controller) input points Download PDF

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Publication number
CN105204428A
CN105204428A CN201510740453.2A CN201510740453A CN105204428A CN 105204428 A CN105204428 A CN 105204428A CN 201510740453 A CN201510740453 A CN 201510740453A CN 105204428 A CN105204428 A CN 105204428A
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CN
China
Prior art keywords
plc
input point
point
output
input
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Pending
Application number
CN201510740453.2A
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Chinese (zh)
Inventor
谢建云
龚敏
王景华
左志勇
梁灵枝
李昱糠
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Zhongshan Zhongkai Environmental Protection Equipment Manufacturing Co Ltd
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Zhongshan Zhongkai Environmental Protection Equipment Manufacturing Co Ltd
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Priority to CN201510740453.2A priority Critical patent/CN105204428A/en
Publication of CN105204428A publication Critical patent/CN105204428A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/054Input/output

Abstract

The invention relates to the technical field of PLCs (programmable logic controllers), and particularly provides an expanded circuit and extension method of PLC input points. The expanded circuit of PLC input points comprises a PLC, wherein the PLC comprises M input points; at least two output points of the PLC are connected with L input points in the M input points through L switches respectively; one of the output points is connected with one of the input points through one of the switches; both M and L are natural numbers larger than 0, and L is smaller than or equal to M. According to the expanded circuit and extension method of PLC input points provided by the embodiment of the invention, through changing the wiring method of a traditional PLC circuit, the number of PLC input points is increased to expand a PLC system under the circumstance that the cost is not increased.

Description

The expanded circuit of the input point of PLC and method
Technical field
The present invention relates to PLC technology field, be specifically related to expanded circuit and the method for the input point of a kind of PLC.
Background technology
Programmable logic controller (PLC) (ProgrammableLogicController, PLC) conventional at present has 14 input points, and Ke Dui 14 tunnel input data process simultaneously.But in use, often there is the situation that input point is not enough, need to extend PLC system.When PLC system needs enlarging, general solution increases PLC expansion module on the basis of original system, but so often cause two problems: the first limits based on the volume of original PLC control cabinet, do not have unnecessary space that PLC expansion module can be installed, or cause the volume of control box to increase after PLC expansion module has been installed, cause PLC control cabinet to install; It two is increase PLC expansion module to increase cost accordingly.
Summary of the invention
In view of this, the object of the embodiment of the present invention is expanded circuit and the method for the input point providing a kind of PLC, inputs to improve the PLC when extending PLC system not enough problem of counting.
First aspect, embodiments provide the expanded circuit of the input point of a kind of PLC, the expanded circuit of the input point of described PLC comprises PLC, described PLC comprises M input point, at least two output points of described PLC are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, M and L is the natural number being greater than 0, and L≤M.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein, the expanded circuit of the input point of described PLC also comprises diode, a described output point is connected with described switch by a described diode, the positive terminal of described diode is connected with described output point, and the negative pole end of described diode is connected with described switch.
In conjunction with the first possible embodiment of first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein, L<M.
In conjunction with the first possible embodiment of first aspect, embodiments provide the third possible embodiment of first aspect, wherein, L=M.
In conjunction with the third possible embodiment of first aspect, embodiments provide the 4th kind of possible embodiment of first aspect, wherein, 3 output points of L=M=14, described PLC are connected with described 14 input points respectively by 14 switches.
Second aspect, embodiments provides the extended method of the input point of a kind of PLC, and for expanding the input point of the PLC including M input point, the extended method of the input point of described PLC comprises:
Be connected with L input point in a described M input point respectively by L switch by least two of PLC output points, a described output point is connected with a described input point by a described switch, and wherein, M and L is the natural number being greater than 0, and L≤M;
Described in control, at least two output point timesharing conductings successively, read the data of corresponding input point during an output point conducting.
In conjunction with second aspect, the embodiment of the present invention additionally provides the first possible embodiment of second aspect, wherein, described at least two of PLC output points to be connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, comprising:
At least two of PLC output points are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, to connect between described output point with described switch a diode, the positive terminal of described diode is connected with described output point, and the negative pole end of described diode is connected with described switch.
In conjunction with the first possible embodiment of second aspect, embodiments provide the embodiment that the second of second aspect is possible, wherein, described at least two of PLC output points to be connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, comprising:
Be connected with all input points in described 14 input points respectively by 14 switches by 3 of PLC output points, a described output point is connected with a described input point by a described switch.
In conjunction with the embodiment that the second of second aspect is possible, embodiments provide the third possible embodiment of second aspect, wherein, at least two output point timesharing conductings successively described in described control, comprising:
At least two output point timesharing conductings successively described in controlling according to time interval 10ms ~ 30ms.
In conjunction with the third possible embodiment of second aspect, embodiments provide the 4th kind of possible embodiment of second aspect, wherein, at least two output point timesharing conductings successively described in described control, comprising:
At least two output point timesharing conductings successively described in controlling according to time interval 20ms.
The expanded circuit of the input point of the PLC that the embodiment of the present invention provides and method, by at least two of PLC output points are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, M and L is the natural number being greater than 0, and L≤M, can when not increasing cost, the input increasing PLC is counted, to extend PLC system.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the expanded circuit of the input point of a kind of PLC that the embodiment of the present invention provides;
Fig. 2 shows the expanded circuit of the input point of the another kind of PLC that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
In prior art, if need to expand the input point of PLC, need to increase PLC expansion module in former PLC system, so often because the volume restriction of original PLC control cabinet, cause and there is no unnecessary space mounting PLC expansion module, or after PLC expansion module has been installed, cause the volume of control box to increase, PLC control cabinet is caused to install, meanwhile, increase PLC expansion module, cost can be increased accordingly.
Based on this, inventor, through studying for a long period of time, proposes expanded circuit and the method for the input point of PLC provided by the invention, by changing the mode of connection of PLC circuit, when not increasing cost, effectively can improve above-mentioned problem.
Refer to Fig. 1 and Fig. 2, Fig. 1 shows the expanded circuit of the input point of a kind of PLC that the embodiment of the present invention provides, and Fig. 2 shows the expanded circuit of the input point of the another kind of PLC that the embodiment of the present invention provides.
The expanded circuit of the input point of described PLC comprises PLC, described PLC comprises M input point, at least two output points of described PLC are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point respectively by a described switch, M and L is the natural number being greater than 0, and L≤M.
For the ease of understanding the composition of the expanded circuit of the input point of this PLC, explain as follows:
The expanded circuit of the input point of the PLC that the embodiment of the present invention provides comprises PLC, and described PLC comprises N number of output point and M input point, and described N number of output point is respectively O 1, O 2o n, a described M input point is respectively I 1, I 2i m, wherein, n output point in described N number of output point is connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, and n, N, L, M are the natural number being greater than 0, and n≤N, L≤M
O 1by L switch respectively with I 1, I 2i lconnect, O 2by L switch respectively with I 1, I 2i lconnect ... O nby L switch respectively with I 1, I 2i lconnect.
In order to the expanded circuit of the input point of PLC provided the embodiment of the present invention is protected; circuit is prevented to be burned; the expanded circuit of the input point of the PLC that the embodiment of the present invention provides also comprises n diode; wherein; a described output point is connected with described switch by a described diode; the positive terminal of described diode is connected with described output point, and the negative pole end of described diode is connected with described switch.
The number of the input point that different PLC has may be different, and the number of input point is determined by the PLC chosen, and the embodiment of the present invention is not specifically limited this.In the expanded circuit of the input point of PLC as shown in Figure 1 and Figure 2, the number of the input point of described PLC is 14.
According to different expansion demands, can selected part (i.e. L<M) or all (i.e. L=M) input point be used for expanding, also can choose more output point for expansion, the number of the embodiment of the present invention to the input point for expanding and output point does not limit.Such as, when expand demand less time, can selected part input point, less output point be used for expansion, in circuit as shown in Figure 2, have chosen 10 input points in 14 input points and 3 output points in 9 output points for expansion, input point extends to 30 by original 14.
When the demand of expansion is larger, can choose whole input point and more output point for expansion, in circuit as shown in Figure 1, have chosen 3 output points in whole 14 input points and 9 output points for expansion, input point extends to 42 by original 14.In this circuit, the number of the switch that need use is 14 × 3=42, and the number of diode is 3.
The embodiment of the present invention additionally provides the extended method of the input point of a kind of PLC, and for expanding the input point of the PLC including M input point, the extended method of the input point of described PLC comprises:
Be connected with L input point in a described M input point respectively by L switch by least two of PLC output points, a described output point is connected with a described input point by a described switch, M and L is the natural number being greater than 0, and L≤M;
Described in control, at least two output point timesharing conductings successively, read the data of corresponding input point during an output point conducting.
If L input point is respectively I 1, I 2i l, the output point of employing is respectively O 1, O 2o n, then during PLC after the extended method expansion of the input point of PLC using the embodiment of the present invention to provide, it is as follows that PLC reads data:
Control Q 1export high level, all the other output point output low levels, read successively respectively and Q 1the data of the input point connected;
Read data are stored in internal memory;
Control Q 2export high level, all the other output point output low levels, read successively respectively and Q 2the data of the input point connected;
The data be stored in internal memory are replaced by read and Q 2the data of the input point connected;
……
Control Q nexport high level, all the other output point output low levels, read successively respectively and Q 2the data of the input point connected;
The data be stored in internal memory are replaced by read and Q nthe input point data connected.
Certain time delay is there is between constrained input due to PLC, so the acquisition time of each data can not be too short, namely the time interval of two output point timesharing conducting successively can not be too short, in embodiments of the present invention, according at least two output point timesharing conductings successively described in time interval 10ms ~ 30ms control.
Preferably, in the extended method of the input point of the PLC that the embodiment of the present invention provides, the time interval of two output point timesharing conducting is successively 20ms, such as, at reading I 1data time, if employ 3 output points, be respectively Q 1, Q 2, Q 3, then when reading data,
Control Q 1export high level, all the other output point output low levels, read Q 1with I 1the data of the input point of expansion after connecting, the time of reading is 20ms;
Read data are stored in internal memory;
After 20ms, control Q 2export high level, all the other output point output low levels, read Q 2with I 1the data of the input point of expansion after connecting, the time of reading is 20ms;
The data be stored in internal memory are replaced by the Q read 2with I 1the data of the input point of expansion after connecting;
After 20ms, control Q 3export high level, all the other output point output low levels, read Q 3with I 1the data of the input point of expansion after connecting, the time of reading is 20ms;
The data be stored in internal memory are replaced by the Q read 3with I 1the data of the input point of expansion after connecting.
So, I 1data be namely read, visible, for I 1the switch of each expansion input point place circuit when reading data, the time of reading is 20ms, then in embodiments of the present invention between every two input points, as I 1with I 2between read data be spaced apart 60ms.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with within technical scope that those skilled in the art disclose in the present invention; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.

Claims (10)

1. the expanded circuit of the input point of a PLC, it is characterized in that, comprise PLC, described PLC comprises M input point, at least two output points of described PLC are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, M and L is the natural number being greater than 0, and L≤M.
2. the expanded circuit of the input point of PLC according to claim 1, it is characterized in that, also comprise diode, a described output point is connected with described switch by a described diode, the positive terminal of described diode is connected with described output point, and the negative pole end of described diode is connected with described switch.
3. the expanded circuit of the input point of PLC according to claim 2, is characterized in that, L<M.
4. the expanded circuit of the input point of PLC according to claim 2, is characterized in that, L=M.
5. the expanded circuit of the input point of PLC according to claim 4, is characterized in that, L=M=14, and 3 output points of described PLC are connected with described 14 input points respectively by 14 switches.
6. an extended method for the input point of PLC, for expanding the input point of the PLC including M input point, is characterized in that, comprising:
Be connected with L input point in a described M input point respectively by L switch by least two of PLC output points, a described output point is connected with a described input point by a described switch, M and L is the natural number being greater than 0, and L≤M;
Described in control, at least two output point timesharing conductings successively, read the data of corresponding input point during an output point conducting.
7. the extended method of PLC input point according to claim 6, it is characterized in that, described at least two of PLC output points to be connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, comprising:
At least two of PLC output points are connected with L input point in a described M input point respectively by L switch, a described output point is connected with a described input point by a described switch, to connect between described output point with described switch a diode, the positive terminal of described diode is connected with described output point, and the negative pole end of described diode is connected with described switch.
8. the extended method of input point according to claim 7, it is characterized in that, describedly be connected with L input point in a described M input point respectively by L switch by least two of PLC output points, a described output point is connected with a described input point by a described switch, comprising:
Be connected with all input points in described 14 input points respectively by 14 switches by 3 of PLC output points, a described output point is connected with a described input point by a described switch.
9. the extended method of input point according to claim 6, is characterized in that, at least two output point timesharing conductings successively described in described control, comprising:
At least two output point timesharing conductings successively described in controlling according to time interval 10ms ~ 30ms.
10. the extended method of input point according to claim 9, is characterized in that, at least two output point timesharing conductings successively described in described control, comprising:
At least two output point timesharing conductings successively described in controlling according to time interval 20ms.
CN201510740453.2A 2015-11-02 2015-11-02 Expanded circuit and extension method of PLC (programmable logic controller) input points Pending CN105204428A (en)

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CN1072027A (en) * 1992-12-07 1993-05-12 北京联合大学机械工程学院 Expand the diode array and the device thereof of Programmable Logic Controller input point
JP2001014155A (en) * 1999-07-01 2001-01-19 Japan Radio Co Ltd Controller for executing software parts
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CN205080416U (en) * 2015-11-02 2016-03-09 中山市中开环保设备制造有限公司 Expander circuit of PLC's input point

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910002052B1 (en) * 1988-12-28 1991-04-01 대우중공업 주식회사 Module extending device of plc
CN1072027A (en) * 1992-12-07 1993-05-12 北京联合大学机械工程学院 Expand the diode array and the device thereof of Programmable Logic Controller input point
JP2001014155A (en) * 1999-07-01 2001-01-19 Japan Radio Co Ltd Controller for executing software parts
CN103699049A (en) * 2013-12-16 2014-04-02 上海市政工程设计研究总院(集团)有限公司 PLC (Programmable Logic Controller) DI (Digital Input) point extension module and method
CN205080416U (en) * 2015-11-02 2016-03-09 中山市中开环保设备制造有限公司 Expander circuit of PLC's input point

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