CN205080416U - Expander circuit of PLC's input point - Google Patents

Expander circuit of PLC's input point Download PDF

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Publication number
CN205080416U
CN205080416U CN201520869980.9U CN201520869980U CN205080416U CN 205080416 U CN205080416 U CN 205080416U CN 201520869980 U CN201520869980 U CN 201520869980U CN 205080416 U CN205080416 U CN 205080416U
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China
Prior art keywords
plc
input point
point
input
output
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CN201520869980.9U
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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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Abstract

The utility model relates to a PLC technical field particularly, relates to an expander circuit of PLC's input point. This expander circuit of PLC's input point includes PLC, PLC includes a M input point, two at least output points of PLC respectively through a L switch and one is connected to a L input point in the M input point the output point is through one switch and one the input point is connected, and M and L are and are greater than 0 natural number, and L <= M. The mode of connection of this expander circuit of PLC's input point through changing traditional PLC circuit can be under the circumstances of costneutrality, and the input that increases PLC is counted to reach the mesh of enlargement PLC system.

Description

The expanded circuit of the input point of PLC
Technical field
The utility model relates to PLC technology field, is specifically related to the expanded circuit of 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.
Utility model content
The purpose of this utility model is the expanded circuit of the input point providing PLC, to improve above-mentioned problem.
The utility model is achieved in that the expanded circuit of the input point of a kind of PLC, 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.
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 utility model embodiment 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
Concrete connected mode is as follows: 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.
Further, 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, and 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 order to the expanded circuit of the input point of PLC provided the utility model is protected; be burned to prevent PLC circuit; the expanded circuit of the input point of the PLC that the utility model provides also comprises n diode, and namely the quantity of diode is identical with the quantity of the output point for expanding.
Further, L<M.
As another kind of embodiment, L=M.
Further, 3 output points of L=M=14, described PLC are connected with described 14 input points respectively by 14 switches.
The beneficial effect that the utility model realizes: the expanded circuit of the input point of the PLC that the utility model provides 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.The expanded circuit of the input point of this PLC, can when not increasing cost by changing the mode of connection of conventional P lc circuit, and the input increasing PLC is counted, to reach the object of enlarging PLC system.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, 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 utility model, 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 utility model first embodiment provides;
Fig. 2 shows the expanded circuit of the input point of a kind of PLC that the utility model second embodiment provides;
Fig. 3 shows the expanded circuit of the input point of a kind of PLC that the utility model the 3rd embodiment provides.
Embodiment
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 the expanded circuit of the input point of the PLC that the utility model provides.
First embodiment
Refer to Fig. 1, Fig. 1 shows the expanded circuit of the input point of a kind of PLC that the utility model first embodiment provides, wherein,
The expanded circuit of the input point of described PLC comprises PLC, described PLC comprises M (in the present embodiment M=14) individual input point and N (in the present embodiment N=9) individual output point, wherein n (in the present embodiment n=3) the individual output point of described PLC is connected with L input point in a described M input point respectively by L (in the present embodiment L=14) individual 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.
The expanded circuit of the input point of the PLC that the utility model embodiment provides, can when not increasing cost by changing the mode of connection of PLC circuit, the input point of effective expansion technique of PLC.The quantity of the input point after expansion is the product of the number of the number of the output point selected and the input point before expanding, and the input point of the PLC namely after enlarging is 14 × 3=42.
PLC expanded circuit after the input point of PLC has been extended, its using method is as follows:
If L input point is respectively I 1, I 2i l, the output point of employing is respectively O 1, O 2o n, then the step when the expanded circuit of the input point of the PLC using the utility model embodiment to provide reads data is as follows:
Control Q 1export high level, (in circuit shown in the present embodiment Fig. 1, all the other output points herein comprise O to all the other output points 2, O 3) output low level, 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 the utility model embodiment, at least two output point timesharing conductings successively described in controlling according to time interval 10ms ~ 30ms, preferably, during the expanded circuit of the input point of the PLC using the utility model embodiment to provide, the time interval of two output point timesharing conducting is successively 20ms.
Such as, in circuit shown in the present embodiment Fig. 1, at reading I 1data time,
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 the utility model embodiment between every two input points, as I 1with I 2between read data be spaced apart 60ms.
Second embodiment
Refer to Fig. 2, Fig. 2 shows the expanded circuit of the input point of a kind of PLC that the utility model second embodiment provides, wherein, described PLC comprises 14 input points, 3 output points of described PLC are connected with described 14 input points respectively by 14 switches, and a described output point is connected with a described input point by a described switch.
The expanded circuit of the input point of the PLC that the present embodiment provides also comprises 3 diodes, 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 setting of diode, can protect the expanded circuit of the input point of the PLC that the utility model provides, and is burned to prevent PLC circuit.
The using method of the expanded circuit of the input point of the PLC that the utility model embodiment provides please refer to the first embodiment.
3rd embodiment
Refer to Fig. 3, Fig. 3 shows the expanded circuit of the input point of a kind of PLC that the utility model the 3rd embodiment provides, wherein, described PLC comprises 14 input points and 9 output points, 3 output points of described PLC are connected with 10 input points in described 14 input points respectively by 10 switches, a described output point is connected with a described input point by a described switch, and a described output point is connected with described switch by a diode, the positive terminal of described diode is connected with described output point, the negative pole end of described diode is connected with described switch.The input point of the PLC after enlarging is 10 × 3=30.
The using method of the expanded circuit of the input point of the PLC that the utility model embodiment provides please refer to the first embodiment.
In sum, the utility model provides the expanded circuit of the input point of a kind of PLC, 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.
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 utility model embodiment does not limit 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, can choose more output point for expansion, the number of the utility model embodiment to the input point for expanding and output point does not do concrete restriction yet.
Such as, when expand demand less time, can selected part input point, less output point be used for expansion, as shown in Figure 3 in circuit, 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, then the number of diode is 3.
For making the object of the utility model embodiment, technical scheme and advantage clearly, above in conjunction with the accompanying drawing in the utility model embodiment, carry out describing clearly and completely to the technical scheme in the utility model embodiment, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.
The assembly of the utility model embodiment describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.
Therefore, the detailed description of the above embodiment of the present utility model to providing in the accompanying drawings the claimed scope of the present utility model of not intended to be limiting, but only represent selected embodiment of the present utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to define further it and explain in accompanying drawing subsequently.
In description of the present utility model, also it should be noted that, unless otherwise clearly defined and limited, term " setting ", " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.

Claims (5)

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.
CN201520869980.9U 2015-11-02 2015-11-02 Expander circuit of PLC's input point Active CN205080416U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105204428A (en) * 2015-11-02 2015-12-30 中山市中开环保设备制造有限公司 Expanded circuit and extension method of PLC (programmable logic controller) input points

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105204428A (en) * 2015-11-02 2015-12-30 中山市中开环保设备制造有限公司 Expanded circuit and extension method of PLC (programmable logic controller) input points

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