CN220455711U - PLC input point expansion circuit supporting grouping and merging input - Google Patents
PLC input point expansion circuit supporting grouping and merging input Download PDFInfo
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- CN220455711U CN220455711U CN202321764601.0U CN202321764601U CN220455711U CN 220455711 U CN220455711 U CN 220455711U CN 202321764601 U CN202321764601 U CN 202321764601U CN 220455711 U CN220455711 U CN 220455711U
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Abstract
The utility model provides a PLC input point expansion circuit supporting grouping and merging input, which comprises a PLC, a normally closed input merging module, a normally open input merging module and a plurality of grouping expansion modules; the PLC comprises a normally closed input end, a normally open input end and a plurality of grouping input ends; the normally-closed input end is connected with the normally-closed input merging module, the normally-open input end is connected with the normally-open input merging module, and each grouping input end is connected with a corresponding grouping expansion module; the normally closed input combining module comprises a plurality of switches connected in series; the normally open input merging module comprises a plurality of switches connected in parallel; each grouping expansion module comprises a relay and two switches; each corresponding to an external one. By adopting the utility model, the normally closed input merging module, the normally open input merging module and the plurality of grouping expansion modules can be reasonably added, and the PLC input points can be accurately expanded as required.
Description
Technical Field
The utility model relates to the technical field of industrial automation, in particular to a PLC input point expansion circuit supporting grouping and merging input.
Background
A Programmable Logic Controller (PLC) is an electronic system of digital arithmetic operations, which is stored in a programmable memory, and can execute logic operations, sequence control, timing, computation, arithmetic operations, and other operation instructions, and control various types of machines or production processes through digital or analog inputs and outputs. In order to accomplish a strong and complex project, a PLC is required to have a strong and stable expansion capability.
For the PLC, the number of points of an input port is generally one-to-one input, if the number of IO points is insufficient in design/maintenance, a PLC expansion input module is generally added, and the expansion module is generally 8 points which are integral (multiple of 8), but only one or two points are needed in the case, which can increase high cost input undoubtedly, and meanwhile, the expansion module is added to change the space structure of the existing electric cabinet, so that the problems of reinstallation of the electric cabinet and the like are caused, and the maintenance period is prolonged.
For economical PLC, because the economical PLC does not support the function of adding an expansion module, the problem can not be solved under the conditions of design error, maintenance, IO point damage of the PLC and the like, and only the replacement of the PLC body can be solved. Meanwhile, for different brands of PLCs or different models of the same brand of PLCs, the internal program conversion of the PLCs is not necessarily supported, so that the problems of re-writing of the PLC program, re-debugging of equipment, re-installing of equipment lines and the like of an electrical engineer are required, and the problems of increased input cost, prolonged maintenance period, complex design and the like are caused.
Disclosure of Invention
The embodiment of the utility model provides a PLC input point expansion circuit supporting grouping and merging input, which is provided with a normally closed input merging module, a normally open input merging module and a plurality of grouping expansion modules, so that the PLC input points can be expanded accurately as required.
To achieve the above object, a PLC input point expansion circuit supporting packet and merge inputs according to an embodiment of the present application includes: the system comprises a PLC, a normally closed input merging module, a normally open input merging module and a plurality of grouping expansion modules;
the PLC comprises a normally closed input end, a normally open input end and a plurality of grouping input ends; the normally-closed input end is connected with the normally-closed input merging module, the normally-open input end is connected with the normally-open input merging module, and each grouping input end is connected with a corresponding grouping expansion module;
the normally closed input combining module comprises a plurality of switches connected in series; the normally open input merging module comprises a plurality of switches connected in parallel; each grouping expansion module comprises a relay and two switches; each corresponding to an external one.
In one possible implementation, a plurality of switches are connected in series in the normally closed input combining module, wherein one end of one switch is connected to the normally closed input terminal.
In one possible implementation, a plurality of switches are connected in parallel in the normally open input combining module, and one end of each switch is connected to the normally open input terminal.
In one possible implementation, in each packet expansion module, one switch is an automatic switch, and the other switch is a manual switch; one fixed contact of the relay is connected with the automatic switch, and the other fixed contact of the relay is connected with the manual switch.
Compared with the prior art, the PLC input point expansion circuit supporting grouping and merging input provided by the embodiment of the utility model has the advantages that the normally closed input merging module, the normally open input merging module and the plurality of grouping expansion modules are added at different input points of the PLC, so that the PLC is expanded at different degrees. The normally-closed input combination module supports any number of normally-closed switches, namely, the normally-closed input end of the PLC supports any number of input quantities with the same function as the normally-closed contacts; the normally open input combination module supports any number of normally open switches, namely, the normally open input end of the PLC supports any number of input quantities with the same function of the normally open contacts; each packet expansion module may enable each packet input to support input to two different states of the manually/automatically switchable system. The number of the grouping expansion modules, the number of the switches of the normally-closed input merging modules and the number of the switches of the normally-open input merging modules are adjusted, so that the input points of the PLC can be expanded accurately and controllably, the utilization rate of the IO points of the PLC can be improved, the problem that the PLC is insufficient in input points is solved, the current situations of long design/maintenance period and the like are reduced.
Drawings
Fig. 1 is a block diagram of a PLC input point expansion circuit supporting packet and merge inputs according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, an embodiment of the present utility model provides a PLC input point expansion circuit supporting packet and merge inputs, including: the system comprises a PLC, a normally closed input combination module 1, a normally open input combination module 2 and a plurality of grouping expansion modules 3.
The PLC comprises a normally closed input end, a normally open input end and a plurality of grouping input ends; the normally closed input end is connected with the normally closed input merging module 1, the normally open input end is connected with the normally open input merging module 2, and each grouping input end is connected with a corresponding grouping expansion module 3.
The normally closed input combination module 1 comprises a plurality of switches connected in series; the normally open input combining module 2 comprises a plurality of switches connected in parallel; each grouping expansion module 3 comprises a relay and two switches; each corresponding to an external one.
By adjusting the number of the grouping expansion modules, the number of the switches of the normally-closed input combination modules and the number of the switches of the normally-open input combination modules, the input points of the PLC can be expanded accurately and controllably, for example:
for example, for a system with two working states, for example, for a manual and automatic selectable system, because the manual and automatic states of the device cannot exist simultaneously, the input points of the PLC can be expanded by adding a plurality of packet expansion modules 3 when the embodiment is adopted.
For example, for the input amount of the switch with the same function, a method of combining inputs may be adopted: for a large and medium-sized device, only one button for emergency stop, start and stop is often adopted, and for the input quantity with the same function, a method for merging input can be adopted, namely, a normally closed input merging module is adopted, and the number of internal switches of the module is adjusted to continuously expand the input points of the PLC. If the input quantity is the same function of a plurality of normally open contacts, a parallel input mode is adopted. If the input quantity is the same function of a plurality of normally-closed contacts, adopting a serial input mode, namely adopting a normally-open input merging module and adjusting the number of internal switches of the module to continuously expand the input points of the PLC.
Illustratively, a plurality of switches are connected in series in the normally closed input combining module 1, one end of one of the switches being connected to the normally closed input terminal.
In this embodiment, SB1, SB2, SB3 correspond to buttons with the same function, and a serial connection manner may be adopted. Such as a plurality of scram buttons on a device.
Illustratively, a plurality of switches are connected in parallel in the normally open input combining module 2, with one end of each switch being connected to the normally open input.
In this embodiment, SB4, SB5, SB6 correspond to buttons with the same function, and may be connected in parallel. Such as a plurality of start and stop buttons on a device.
The normally closed input combining module 1 selects a plurality of switches to be connected in series, and the normally open input combining module 2 selects a plurality of switches to be connected in parallel, because: if the normally open mode corresponds to the serial mode, a plurality of normally open modes are arranged on one line, and then the normally open modes are needed to be pressed down, and signals are input into the PLC. And a normally open corresponding parallel connection mode is selected, and a signal can be input into the PLC only by pressing one normally open point on one line. Likewise, normally closed corresponds to a series input mode, and normally open corresponds to a parallel input mode. On a large-sized device, a plurality of input amounts are often shared, such as a scram button. The scram buttons can not be respectively input on different input ends of the PLC in design, so that the method wastes the input points of the PLC and increases the programming quantity of the program. But a mode that a plurality of emergency stop buttons are connected in series (normally closed buttons are adopted for emergency stop) is more common.
Illustratively, in each packet expansion module 3, one switch is an automatic switch and the other switch is a manual switch; one fixed contact of the relay is connected with the automatic switch, and the other fixed contact of the relay is connected with the manual switch.
In this embodiment, KM1 is an energizing coil of the relay, and the packet expansion module 3 may be selected to be separated from the PLC input point expansion circuit, so that the packet expansion module 3 is connected to an output end of an external system, and only used for manual/automatic situations of an external selection device. When the automatic is selected, the corresponding KM1 coil is electrified, the contact corresponding to KM1 is changed from normally open to normally closed, and from normally closed to normally open, the manual/automatic false touch of the internal program of the PLC can be prevented, and a hardware interlocking structure is formed. In comparison, 8 original input points of the PLC are changed into 8 manual input points and 8 automatic input points, so that the utilization rate of the input points of the PLC is doubled, and the production cost of equipment is effectively reduced.
Compared with the prior art, the PLC input point expansion circuit supporting grouping and merging input provided by the embodiment of the utility model has the advantages that the normally closed input merging module, the normally open input merging module and the plurality of grouping expansion modules are added at different input points of the PLC, so that the PLC is expanded at different degrees. The normally-closed input combination module supports any number of normally-closed switches, namely, the normally-closed input end of the PLC supports any number of input quantities with the same function as the normally-closed contacts; the normally open input combination module supports any number of normally open switches, namely, the normally open input end of the PLC supports any number of input quantities with the same function of the normally open contacts; each packet expansion module may enable each packet input to support input to two different states of the manually/automatically switchable system. The number of the grouping expansion modules, the number of the switches of the normally-closed input merging modules and the number of the switches of the normally-open input merging modules are adjusted, so that the input points of the PLC can be expanded accurately and controllably, the utilization rate of I O points of the PLC can be improved, the problem that the input points of the PLC are insufficient is solved, the current situations of long design/maintenance period and the like are reduced.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.
Claims (4)
1. A PLC input point expansion circuit supporting packet and merge inputs, comprising: the system comprises a PLC, a normally closed input merging module, a normally open input merging module and a plurality of grouping expansion modules;
the PLC comprises a normally closed input end, a normally open input end and a plurality of grouping input ends; the normally-closed input end is connected with the normally-closed input merging module, the normally-open input end is connected with the normally-open input merging module, and each grouping input end is connected with a corresponding grouping expansion module;
the normally closed input combining module comprises a plurality of switches connected in series; the normally open input merging module comprises a plurality of switches connected in parallel; each grouping expansion module comprises a relay and two switches; each corresponding to an external one.
2. The PLC input point expansion circuit supporting packet and merge inputs of claim 1, wherein a plurality of switches are connected in series in said normally closed input merge module, wherein one end of one switch is connected to said normally closed input.
3. The PLC input point expansion circuit supporting packet and merge inputs of claim 1, wherein a plurality of switches are connected in parallel in the normally open input merge module, one end of each switch being connected to the normally open input.
4. The PLC input point expansion circuit supporting packet and merge inputs of claim 1, wherein in each packet expansion module, one switch is an automatic switch and the other switch is a manual switch; one fixed contact of the relay is connected with the automatic switch, and the other fixed contact of the relay is connected with the manual switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321764601.0U CN220455711U (en) | 2023-07-06 | 2023-07-06 | PLC input point expansion circuit supporting grouping and merging input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321764601.0U CN220455711U (en) | 2023-07-06 | 2023-07-06 | PLC input point expansion circuit supporting grouping and merging input |
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| Publication Number | Publication Date |
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| CN220455711U true CN220455711U (en) | 2024-02-06 |
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| CN202321764601.0U Active CN220455711U (en) | 2023-07-06 | 2023-07-06 | PLC input point expansion circuit supporting grouping and merging input |
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| CN (1) | CN220455711U (en) |
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- 2023-07-06 CN CN202321764601.0U patent/CN220455711U/en active Active
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