CN112652929A - PLC inter-board communication system - Google Patents
PLC inter-board communication system Download PDFInfo
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- CN112652929A CN112652929A CN202011468461.3A CN202011468461A CN112652929A CN 112652929 A CN112652929 A CN 112652929A CN 202011468461 A CN202011468461 A CN 202011468461A CN 112652929 A CN112652929 A CN 112652929A
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 238000010586 diagram Methods 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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Abstract
The application discloses communication system between PLC boards. The communication system between PLC board includes: the system comprises a main control unit, at least one connecting unit and at least one expansion unit; the connection unit is connected with the main control unit and the external expansion unit; if the number of the external expansion units is multiple, any two adjacent expansion units are connected through one connecting unit. The technical problem that in the prior art, the main control unit of the PLC can not be expanded is solved.
Description
Technical Field
The application relates to the technical field of programmable controllers, in particular to a communication system between PLC boards.
Background
The existing programmable controller PLC generally adopts an integrally fixed form in structural form, and cannot be expanded due to the fact that control point positions are fixed; therefore, the method is only suitable for fixed special industrial control occasions; and cannot be used for more scenes.
Aiming at the problem that the PLC in the related technology can not be expanded, an effective solution is not provided at present.
Disclosure of Invention
The main aim at of this application provides a communication system between PLC board to solve the technical problem that PLC can not expand.
In order to achieve the above object, according to one aspect of the present application, there is provided a PLC board-to-board communication system. The method comprises the following steps: the system comprises a main control unit, at least one connecting unit and at least one expansion unit;
the connection unit is connected with the main control unit and the external expansion unit;
if the number of the external expansion units is multiple, any two adjacent expansion units are connected through one connecting unit.
Further, the extension unit comprises an input/output (IO) unit and/or a gateway module;
and the main control unit is provided with pins corresponding to the IO unit and the grid module respectively.
Further, the main control unit is configured to identify a location and/or a number of the extension units connected by the connection unit.
Furthermore, the main control unit is provided with a first row of pins and a second row of pins;
the main control unit is further used for determining that one side of the second row of pins is connected with the expansion unit if the second row of pins is detected to have current and the first row of pins does not have current;
and if the first row of pins is detected to have current and the second row of pins does not have current, determining that one side of the first row of pins is connected with the expansion unit.
Further, the main control unit is also used for,
if the second row of pins is detected to be currentless, the first row of pins has current;
calculating the current value of the first row of pins;
and if the current value is N times of the preset current threshold value, determining that the number of the expansion units connected with one side of the first row of pins is N.
Further, the first row of pins of the main control unit includes: a1, a2, A3, a4, a5, a6, a7, A8, a9, and a 10;
the second row of pins of the main control unit comprises: b1, B2, B3, B4, B5, B6, B7, B8, B9 and B10;
wherein, A4-A7 and B4-B7 are used for connecting the gateway module; A1-A2, B1-B2 are used to identify the location and number of connected input-output cells.
The A9, the A10, the B9 and the B10 are used for connecting the input/output IO module.
Further, the system also comprises an interface circuit of the main control unit and an interface circuit of the expansion unit;
the interface circuit of the main control unit comprises a power supply; a first resistor and a second resistor; the first end of the first resistor is connected with a power supply; the first end of the second resistor is connected with a power supply; the second end of the first resistor is connected with a pin 1B of the main control unit; the second end of the second resistor is connected with a pin 1A of the main control unit;
the first end of the third resistor is grounded, and the second end of the third resistor is connected with a pin 2B of the main control unit;
the expansion unit interface circuit includes: a fourth resistor, a fifth resistor and a sixth resistor;
the first end of the fourth resistor is grounded, and the second end of the fourth resistor is respectively connected with pins 2A and 2B of the extension unit;
the first end of the fifth resistor is grounded, and the second end of the fifth resistor is connected with a pin 1B of the extension unit; the first end of the sixth resistor is connected with the power supply; the second end is connected with a pin 1A of the extension unit;
further, the power supply is 3.3 volts; the resistance value of the first resistor is 18 k; the resistance value of the second resistor is 10 k; the resistance value of the third resistor is 10 k; the resistance value of the fourth resistor is 100 k; the resistance value of the fifth resistor is 100 k; the resistance of the sixth resistor is 10 k.
By arranging the connecting unit and the expansion unit, the expansion of the main control unit can be realized, so that the expansion performance of the main control unit is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1A is a schematic structural diagram of a PLC board-to-board communication system according to an embodiment of the present disclosure;
fig. 1B is a schematic structural diagram of another PLC inter-board communication system according to an embodiment of the present disclosure;
fig. 2A is a schematic diagram of a pin distribution on a master control unit according to an embodiment of the present application;
FIG. 2B is a schematic diagram of a connection according to an embodiment of the present application;
FIG. 2C is another schematic illustration of a connection according to an embodiment of the present application;
FIG. 3A is a left side view of a connection unit according to an embodiment of the present application;
FIG. 3B is a bottom view of a connection unit according to an embodiment of the present application;
fig. 3C is a connection diagram illustrating the connection between the main control unit 10 and the expansion unit 12 through the connection unit 11 according to the embodiment of the present application;
FIG. 4 is a circuit diagram of the main control unit according to an embodiment of the present application;
FIG. 5A is a schematic diagram of a master control unit interface circuit according to an embodiment of the present application;
FIG. 5B is a schematic diagram of an expansion unit interface circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The application provides a communication system between PLC board, refer to fig. 1A, this system includes: a main control unit 10, at least one connection unit 11 and at least one expansion unit 12; wherein, the connection unit 11 connects the main control unit and the external expansion unit 12.
If there are a plurality of external extension units 12, see FIG. 1B; any two adjacent expansion units 12 are connected by a connecting unit.
The expansion unit may be an IO module, a gateway module, or other forms of electronic devices. The specific form is not limiting in this application.
In order to implement connection, the main control unit is provided with a plurality of rows of pins, see a pin distribution diagram on the main control unit shown in fig. 2A; comprises two rows of pins;
the first row of pins of the main control unit comprises: a1, a2, A3, a4, a5, a6, a7, A8, a9, and a 10; the second row of pins of the main control unit comprises: b1, B2, B3, B4, B5, B6, B7, B8, B9 and B10; the pin needles of the main control unit are matched with the slots of the connecting part; and realizing connection expansion.
Wherein, A4-A7 and B4-B7 are used for connecting the gateway module; A1-A2, B1-B2 are used to identify the location and number of connected input-output cells.
The A9, the A10, the B9 and the B10 are used for connecting the input/output IO module.
The function of the pins is as follows from table 1:
TABLE 1
See the schematic connection shown in FIG. 2B; the main control unit 10 is alongside the expansion unit 12; a column of pins of the main control unit 10 and a column of pins of the extension unit 12 are connected by a connection unit.
As shown in fig. 2C, after connection, pin 1A of the main control unit is connected to pin 1B of the expansion unit.
Pin 3A of the main control unit is connected to pin 3B of the extension unit. (not shown in the figure)
Pin 7A of the main control unit is connected to pin 7B of the extension unit. (not shown in the figure)
Pin 8A of the main control unit is connected to pin 8B of the extension unit. (not shown in the figure)
Pin 9A of the main control unit is connected to pin 9B of the extension unit. (not shown in the figure)
Pin 10A of the main control unit is connected to pin 10B of the extension unit. (not shown in the figure)
In one embodiment, the present application also proposes a connection unit; see FIG. 3A for a left side view of the connection unit; comprises a main body part and a holding part 10; two connecting portions 11; wherein the main body part is provided with the holding part; two connecting parts 11 are respectively arranged at the two corresponding sides of the main body part.
As shown in fig. 3B, the connecting portion 11 is provided with a plurality of slots that match the pin pins; in use, the connection portion 11 is inserted into the corresponding main control unit slot.
Referring to fig. 3C, a connection diagram of the main control unit 10 and the expansion unit 12 connected by the connection unit 11 is shown; the connection parts 11 are inserted into the slots of the main control unit 10 and the expansion unit 12, respectively.
In one embodiment, the main control unit is configured to identify a location and/or a number of the extension units connected by the connection unit.
The main control unit is further used for determining that one side of the second row of pins is connected with the expansion unit if the second row of pins is detected to have current and the first row of pins does not have current;
and if the first row of pins is detected to have current and the second row of pins does not have current, determining that one side of the first row of pins is connected with the expansion unit.
In one embodiment, the present application provides a master control unit, referring to the internal circuit diagram of the master control unit shown in fig. 5;
referring to fig. 4, an RS485 chip is also arranged inside the main control unit; a chip KSZ8851SNLI is also arranged;
a pin 1 a; 1 b; 2a and 2b are respectively used for connecting with a CPU, so that the CPU is used for detection;
the pin 1a is connected with a first end of the resistor R22; the second end of the resistor R22 is connected with a 3.3 volt power supply;
pin 1b is connected to a first end of a resistor R21, and a second end of the resistor R21 is connected to a 3.3-volt power supply;
pin 2b is connected to a first end of resistor R20; the second terminal of resistor R20 is connected to ground.
The first chip KSZ8851SNLI is provided with 8 pull-up resistors R1-R8; each pull-up resistor is connected with a 3.3-volt power supply; wherein R1 and R2 are connected with pins 14 of the chip; r3 and R4 connect pins 15; the pin 5 and the pin 6 are connected with a pin 11 of the chip; pins 7 and 8 are connected to pins 12 of the chip.
The second chip KSZ8851SNLI is provided with 8 pull-up resistors R9-R16; each pull-up resistor is connected with a 3.3-volt power supply;
4a is connected to pin 12 of the first chip KSZ8851 SNLI;
4b is connected with a pin 15 of the KSZ8851SNLI of the second chip, wherein a capacitor is arranged on the connecting lead;
5a is connected to pin 11 of first chip KSZ8851 SNLI;
5b is connected with a pin 14 of the second chip KSZ8851SNLI, wherein a capacitor is arranged on the connecting lead;
6a is connected to pin 15 of the first chip KSZ8851 SNLI;
6b is connected with pin 12 of KSZ8851SNLI of the second chip;
7a is connected to pin 14 of first chip KSZ8851 SNLI;
7b is connected with pin 11 of KSZ8851SNLI of the second chip;
pins 9a, 9b, 10a, 10b are used to connect the RS485 bus;
9a and 9b are connected with a pin A of the SN65HVD 75D;
10a, 10B are connected to pin B of chip SN65HVD 75D;
the pin DE of the chip SN65HVD75D is connected with the first end of the resistor R422, and the second end of the resistor R422 is connected with a 33-volt power supply;
the pin DE is also connected with a collector of the triode; the emitter of the triode is grounded;
the base electrode of the triode is connected with the first end of the resistor R11; the second end of the resistor R11 is connected with RS485 TX;
the resistor R12 has a first terminal connected to the emitter and a second terminal connected to the base.
Pins RE and R of the chip SN65HVD75D are connected with RS485 RX;
the main control circuit is internally provided with a chip CP 1017N; wherein, the pin 4 is connected with the pin 10B;
In one embodiment, the present application also proposes an interface circuit; referring to the schematic diagram of the master control unit interface circuit shown in FIG. 5A; and FIG. 5B is a schematic diagram of an expansion unit interface circuit.
The interface circuit of the main control unit comprises a power supply; a first resistor R21 and a second resistor R22; the first end of the first resistor R21 is connected with a power supply; a first end of the second resistor R22 is connected with a power supply; the second end of the first resistor R21 is connected with pin 1B of the main control unit; the second end of the second resistor R22 is connected with pin 1A of the main control unit;
the first end of the third resistor R20 is grounded, and the second end is connected with the pin 2B of the main control unit;
the expansion unit interface circuit includes: a fourth resistor, a fifth resistor and a sixth resistor;
a first end of the fourth resistor R501 is grounded, and a second end of the fourth resistor R501 is connected to pins 2A and 2B of the extension unit respectively;
a first end of the fifth resistor R502 is grounded, and a second end is connected with a pin 1B of the extension unit;
a first end of the sixth resistor R500 is connected with a power supply; the second end is connected with a pin 1A of the extension unit;
when in use, the position of the extension unit has two situations; one is on the left side of the master control unit; in one case, the extension unit is disposed at the right side of the main control unit.
When the expansion unit is disposed on the left side of the main control unit, pin 1A of the main control unit in fig. 5A is connected to pin 1B of the expansion unit in fig. 5B; the 2A pin of the master unit in FIG. 5A is connected to the 2B pin of the expansion unit in FIG. 5B; resistor R520 in fig. 5B forms a series circuit with R22 in fig. 5A and the power supply. The pin 1A of the main control unit and the pin 1B of the extension unit generate current and voltage; no current and no voltage are generated on the pin 2A of the main control unit and the pin 2B of the extension unit;
that is, if it is detected that the pin 1A of the main control unit has current and the pin 2A has no current, it is determined that the position of the extension unit is set on the left side of the main control unit;
when the expansion unit is disposed at the right side of the main control unit, the 1B pin of the main control unit in fig. 5A is connected to the 1A pin of the expansion unit in fig. 5B; the 2B pin of the master control unit in FIG. 5A is connected to the 2A pin of the expansion unit in FIG. 5B;
the power supply is connected with the resistor R21, the resistor R500 and the power supply in series; no current is generated. Neither pin 1B of the master unit in fig. 5A nor pin 1A of the extension unit in fig. 5B has current and voltage generated.
The 2B pin of the master control unit in FIG. 5A is connected to the 2A pin of the expansion unit in FIG. 5B;
ground, resistance R20; resistor R501 is connected in series with ground but no current voltage is generated on the pin because there is no power supply.
That is, if it is detected that neither of the pins 1B and 2B of the main control unit has voltage current generated, it is determined that the extension unit is disposed at the right side of the main control unit.
According to the technical scheme, the development period is shortened, development failure and repeated development cost are reduced, the standardized inter-board communication structure can be accessed to the system as long as the developed module supports the communication structure, all functions do not need to be developed at one time, and the repeated development cost is reduced.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A PLC board-to-board communication system, comprising: the system comprises a main control unit, at least one connecting unit and at least one expansion unit;
the connection unit is connected with the main control unit and the external expansion unit;
if the number of the external expansion units is multiple, any two adjacent expansion units are connected through one connecting unit.
2. The PLC board-to-board communication system according to claim 1, wherein the extension unit includes an input/output IO unit, and/or a gateway module;
and the main control unit is provided with pins corresponding to the IO unit and the grid module respectively.
3. The PLC board-to-board communication system of claim 1, wherein the main control unit is configured to identify a location and/or a number of the extension units connected through the connection unit.
4. The PLC inter-board communication system of claim 3,
the main control unit is provided with a first row of pins and a second row of pins;
the main control unit is further used for determining that one side of the second row of pins is connected with the expansion unit if the second row of pins is detected to have current and the first row of pins does not have current;
and if the first row of pins is detected to have current and the second row of pins does not have current, determining that one side of the first row of pins is connected with the expansion unit.
5. The PLC inter-board communication system of claim 4, wherein the master control unit is further configured to,
if the second row of pins is detected to be currentless, the first row of pins has current;
calculating the current value of the first row of pins;
and if the current value is N times of the preset current threshold value, determining that the number of the expansion units connected with one side of the first row of pins is N.
6. The PLC board-to-board communication system of claim 1,
the first row of pins of the main control unit comprises: a1, a2, A3, a4, a5, a6, a7, A8, a9, and a 10;
the second row of pins of the main control unit comprises: b1, B2, B3, B4, B5, B6, B7, B8, B9 and B10;
wherein, A4-A7 and B4-B7 are used for connecting the gateway module; A1-A2, B1-B2 are used to identify the location and number of connected input-output cells.
The A9, the A10, the B9 and the B10 are used for connecting the input/output IO module.
7. The PLC inter-board communication system of claim 6, further comprising an interface circuit of the main control unit and an interface circuit of the extension unit;
the interface circuit of the main control unit comprises a power supply; a first resistor and a second resistor; the first end of the first resistor is connected with a power supply; the first end of the second resistor is connected with a power supply; the second end of the first resistor is connected with a pin 1B of the main control unit; the second end of the second resistor is connected with a pin 1A of the main control unit;
the first end of the third resistor is grounded, and the second end of the third resistor is connected with a pin 2B of the main control unit;
the expansion unit interface circuit includes: a fourth resistor, a fifth resistor and a sixth resistor;
the first end of the fourth resistor is grounded, and the second end of the fourth resistor is respectively connected with pins 2A and 2B of the extension unit;
the first end of the fifth resistor is grounded, and the second end of the fifth resistor is connected with a pin 1B of the extension unit;
the first end of the sixth resistor is connected with the power supply; the second terminal is connected to pin 1A of the extension unit.
8. The PLC inter-board communication system of claim 7,
the power supply is 3.3 volts;
the resistance value of the first resistor is 18 k;
the resistance value of the second resistor is 10 k;
the resistance value of the third resistor is 10 k;
the resistance value of the fourth resistor is 100 k;
the resistance value of the fifth resistor is 100 k;
the resistance of the sixth resistor is 10 k.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011468461.3A CN112652929A (en) | 2020-12-11 | 2020-12-11 | PLC inter-board communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011468461.3A CN112652929A (en) | 2020-12-11 | 2020-12-11 | PLC inter-board communication system |
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| CN112652929A true CN112652929A (en) | 2021-04-13 |
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| CN203038058U (en) * | 2012-12-07 | 2013-07-03 | 杨光 | Programmable controller i/o slave station |
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| CN110515343A (en) * | 2019-09-25 | 2019-11-29 | 深圳市海浦蒙特科技有限公司 | Communication link, programmable logic controller (PLC), the means of communication and product |
| CN214100170U (en) * | 2020-12-11 | 2021-08-31 | 工业和信息化部威海电子信息技术综合研究中心 | Communication system between electric appliance connecting device and PLC board |
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2020
- 2020-12-11 CN CN202011468461.3A patent/CN112652929A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203038058U (en) * | 2012-12-07 | 2013-07-03 | 杨光 | Programmable controller i/o slave station |
| CN204406134U (en) * | 2014-12-30 | 2015-06-17 | 福州富昌维控电子科技有限公司 | A kind of PLC expanding element device based on novel universal serial bus |
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