CN219659735U - PLC network expansion middleware and PLC network expansion system - Google Patents
PLC network expansion middleware and PLC network expansion system Download PDFInfo
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- CN219659735U CN219659735U CN202320274925.XU CN202320274925U CN219659735U CN 219659735 U CN219659735 U CN 219659735U CN 202320274925 U CN202320274925 U CN 202320274925U CN 219659735 U CN219659735 U CN 219659735U
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Abstract
The utility model discloses a PLC network expansion middleware and a PLC network expansion system, and relates to the technical field of automatic control. The PLC network expansion middleware comprises an electric connection interface, two different resistance circuits are selected to correspond to two different versions of the PLC network expansion middleware, the corresponding PLC network expansion middleware is powered by a PLC device or an external power supply, the PLC network expansion middleware is only used as a network connection, other different PLC expansion modules with EtherCAT communication can be compatible, various PLC expansion modules are cascaded as required mainly through the two different PLC network expansion middleware, the commonality of products is effectively improved, data transmission can be completed without a processor and a PHY chip, the display communication connection state of an LED display lamp is achieved, and the circuit is simple and the cost is reduced.
Description
Technical Field
The utility model relates to the technical field of automatic control, in particular to a PLC (programmable logic controller) network expansion middleware and a PLC network expansion system.
Background
In an industrial control scene, the field deployment is complex, and the EtherCAT has the advantages of high reliability, strong safety, good instantaneity, abundant diagnostic information, convenient network establishment and the like, so that the problem caused by a large number of cable connections is effectively solved by using the EtherCAT bus mode.
EtherCAT communication in an industrial control scene is usually realized based on a programmable logic controller (Programmab le Logic Contro l ler, PLC), in a complex industrial control environment, various expansion modules are often required to be accessed to meet control requirements in order to increase the use function of the EtherCAT bus PLC, and each access module or middleware is required to be provided with a PHY chip for receiving and transmitting data in the related art, so that the corresponding circuit module is provided with a processor and a PHY chip, the cost is increased, meanwhile, the circuit is complex, and the commonality of the expansion modules with different product models is low.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the embodiment of the utility model provides the PLC network expansion middleware and the PLC network expansion system, which can reduce cost, simplify circuits and provide the shared middleware for EtherCAT communication.
In a first aspect, an embodiment of the present utility model provides a PLC network expansion middleware, including:
an electrical connection interface;
a first resistor circuit;
the second resistor circuit comprises a power supply circuit, and the power supply circuit is used for being connected with an external power supply;
the LED control circuit comprises an LED display lamp;
when the first resistor circuit is selected to be attached, the PLC network expansion middleware is connected with a PLC device, the electrical connection interface is connected with the PLC device to receive communication data signals, and the PLC device provides working voltage for the LED control circuit;
when the second resistor circuit is selected, the PLC network expansion middleware is connected with the PLC expansion module, the electrical connection interface is connected with the PLC expansion module to receive communication data signals, and the external power supply provides working voltage for the LED control circuit;
and the LED control circuit is used for generating a communication connection state signal to control the on-off of the LED display lamp when receiving the communication data signal.
In some embodiments of the utility model, further comprising: and the RJ45 interface is used for cascading with other PLC network expansion middleware through a network cable so as to realize EtherCAT communication by using the PLC network expansion middleware, and the communication data signals are EtherCAT communication signals.
In some embodiments of the utility model, the LED control circuit further comprises: the LED display device comprises a voltage division module and a control module, wherein the control module comprises an LED display lamp;
the voltage dividing module is used for dividing the working voltage to obtain bias voltage and outputting the bias voltage to the control module;
and the control module is used for controlling the LED display lamp to be turned on or off according to the communication connection state signal and the bias voltage.
In some embodiments of the utility model, the voltage dividing module comprises: the first resistor, the second resistor and the first capacitor;
the first end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is grounded, and the first end of the first resistor also receives the working voltage;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
In some embodiments of the utility model, the control module further comprises: the triode, the third resistor, the fourth resistor and the second capacitor;
the base electrode of the triode is connected with the second end of the first resistor, the collector electrode of the triode is connected with the first end of the third resistor and the first end of the second capacitor, and the emitter electrode of the triode is connected with the first end of the fourth resistor;
the second end of the third resistor is connected with the cathode of the LED display lamp, and the anode of the LED display lamp receives the working voltage;
a second end of the fourth resistor and a second end of the second capacitor are grounded.
In some embodiments of the utility model, the communication data signal comprises: RD+ differential signal and TD+ differential signal; the LED control circuit further includes: a capacitance module including a third capacitance;
the first end of the third capacitor receives RD+ differential signals, and the second end of the third capacitor is connected with the second end of the first resistor and then connected with the base electrode of the triode;
or (b)
And the first end of the third capacitor receives the TD+ differential signal, and the second end of the third capacitor is connected with the second end of the first resistor and then connected with the base electrode of the triode.
In some embodiments of the utility model, the power supply circuit further comprises: a power input protection circuit and a voltage conversion circuit;
the power input protection circuit is connected with the external power supply and is used for performing power protection on the original input voltage of the external power supply to obtain stable direct-current input voltage;
the voltage conversion circuit is connected with the power input protection circuit and is used for reducing the direct current input voltage to obtain the working voltage, and the working voltage is input to the LED control circuit.
In a second aspect, an embodiment of the present utility model further provides a PLC network expansion system, where the PLC network expansion middleware according to the embodiment of the first aspect of the present utility model is applied, including:
the PLC equipment is provided with a first connection interface;
the PLC expansion module is provided with a second connection interface;
the first middleware is used for selecting the first resistor circuit to be connected with the PLC equipment;
the second middleware is used for selecting the second resistor circuit to be connected with the PLC expansion module;
the first connecting interface of the PLC equipment is connected with the electrical connecting interface of the first middleware, the second connecting interface of the PLC expansion module is connected with the electrical connecting interface of the second middleware, and the first middleware is connected with the second middleware through a network cable so as to realize EtherCAT communication between the PLC equipment and the PLC expansion module.
In some embodiments of the utility model, further comprising: the external power supply is connected with the second middleware;
the PLC expansion module is also provided with a third connection interface;
the third connection interface of the PLC expansion module is connected with the second connection interfaces of other PLC expansion modules.
In some embodiments of the present utility model, the third connection interface of the PLC extension module is connected to the electrical connection interface of the second middleware, and the external power supply of the second middleware, which is cascaded at a nearest distance, provides an operating voltage to the LED control circuit of the first middleware.
The embodiment of the utility model at least comprises the following beneficial effects:
the embodiment of the utility model provides a PLC (programmable logic controller) network expansion middleware and a PLC network expansion system, wherein the PLC network expansion middleware comprises an electric connection interface, and when a first resistance circuit is selected, the PLC network expansion middleware is connected with a PLC device, receives a communication data signal through the electric connection interface and provides working voltage by the PLC device; when the second resistor circuit is selected, the circuit further comprises a power supply circuit which is used for being connected with an external power supply, the external power supply provides working voltage, at the moment, the PLC network expansion middleware is connected with the PLC expansion equipment, and communication data signals are received through an electric connection interface; when the LED control circuit receives the communication data signal, the LED control circuit generates a communication connection state signal to control the on-off of the LED display lamp. Therefore, the PLC network expansion middleware is correspondingly and optionally connected with the PLC equipment or the PLC network expansion module through selecting and pasting two groups of different resistance circuits, data transmission can be completed without a processor and a PHY chip, and the PLC network expansion middleware has the LED display lamp to display communication connection states, so that the cost is effectively reduced, and the product sharing property is high.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a PLC network expansion system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an LED control circuit according to one embodiment of the present utility model;
FIG. 3 is a schematic diagram of a PLC network expansion system according to another embodiment of the present utility model;
fig. 4 is a schematic diagram of a PLC network expansion system according to still another embodiment of the present utility model;
reference numerals:
the LED display device comprises a voltage division module 100, a first resistor 110, a second resistor 120, a first capacitor 130, a control module 200, a triode 210, a third resistor 220, a fourth resistor 230, a second capacitor 240, an LED display lamp 250, a capacitor module 300 and a third capacitor 310.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
For a better understanding of the technical solutions provided by the present utility model, the terms presented herein are correspondingly described:
ETherCAT: referring to the ethernet control automation technology, which is an open architecture, ethernet-based fieldbus system, its name CAT is an acronym for control automation technology (Contro l Automat ion Techno logy).
PLC: a programmable logic controller (Programmab le Logic Contro l ler, PLC) is a digital operation electronic system designed specifically for use in an industrial environment. It adopts a programmable memory, in its interior is stored the instruction for executing logic operation, sequence control, timing, counting and arithmetic operation, etc. and utilizes digital or analog input and output to control various mechanical equipments or production processes.
PHY: the port physical layer (physical) is a common abbreviation for the OSI model physical layer. And ethernet is a device that operates the OSI model physical layer. An ethernet PHY is a chip that can send and receive ethernet data frames.
Along with the development of industrial technology, the industrial control field has higher requirements on communication speed, communication distance and communication quality, and the EtherCAT has the advantages of high reliability, high safety, good instantaneity, abundant diagnostic information, convenient network establishment and the like, so that the EtherCAT becomes an emerging technology in the industrial control field. However, in a complex industrial control environment, in order to increase the use functions of the bus PLC, various expansion modules are often required to be connected to meet the control requirements, and in the related art, each access module or middleware needs to be provided with a PHY chip for receiving and transmitting data, so that the corresponding circuit module is provided with a processor and a PHY chip, which results in cost increase, meanwhile, the circuit is relatively complex, and the commonality of the expansion modules with different product types is low.
Based on the above, the embodiment of the utility model provides a PLC network expansion middleware and a PLC network expansion system, wherein the PLC network expansion middleware comprises an electrical connection interface, and when a first resistor circuit is selected, the PLC network expansion middleware is connected with a PLC device, receives a communication data signal through the electrical connection interface, and provides working voltage by the PLC device; when the second resistor circuit is selected, the circuit further comprises a power supply circuit which is used for being connected with an external power supply, the external power supply provides working voltage, at the moment, the PLC network expansion middleware is connected with the PLC expansion equipment, and communication data signals are received through an electric connection interface; upon receiving the communication data signal, the LED control circuit generates a communication connection status signal to control the turning on and off of the LED display lamp 250. Therefore, the PLC network expansion middleware is correspondingly and optionally connected with the PLC equipment or the PLC network expansion module through selecting and pasting two groups of different resistance circuits, data transmission can be completed without a processor and a PHY chip, and the PLC network expansion middleware has the LED display lamp to display communication connection states, so that the cost is effectively reduced, and the product sharing property is high.
Referring to the schematic diagram of the PLC network expansion system shown in fig. 1, in some embodiments of the present utility model, the PLC network expansion system includes a PLC device having a first connection interface, at least one PLC expansion module having a second connection interface, and a first middleware and a second middleware each having an electrical connection interface, where the first middleware and the second middleware are both PLC network expansion middleware, the first middleware is selected for connection with the PLC device, and the first middleware is selected for connection with the PLC expansion device, and the second middleware is selected for connection with the PLC expansion device. Specifically, the first connection interface of the PLC device is connected with the electrical connection interface of the first middleware, the second connection interface of the PLC expansion module is connected with the electrical connection interface of the second middleware, and the first middleware is connected with the second middleware through a network cable, so that EtherCAT communication between the PLC device and the PLC expansion module is realized.
In some embodiments of the utility model, the PLC network expansion middleware includes an electrical connection interface, a first resistive circuit, a second resistive circuit, and an LED control circuit, wherein the second resistive circuit further includes: the power circuit is used for connecting an external power supply, and the LED control circuit comprises an LED display lamp 250.
Specifically, the first resistance circuit is selectively connected or connected with the second resistance circuit through the selecting resistor and the connecting wire, when the first resistance circuit is selected and pasted by the PLC network expansion middleware, the circuit connected with the second resistance circuit is correspondingly disconnected, so that the power supply circuit is not communicated, and when the first resistance circuit is selected and pasted, the first resistance circuit comprises: the corresponding selecting and pasting resistor, connecting wire and LED control circuit, wherein the PLC network expansion middleware is a first middleware, is connected with the PLC equipment through an electric connection interface to receive communication data signals, and provides working voltage for the LED control circuit by the PLC equipment; when the PLC network expansion middleware is selected to be attached to the second resistor circuit, the second resistor circuit also comprises: the corresponding selecting and pasting resistor, connecting wire, power supply circuit and LED control circuit are connected with an external power supply through the power supply circuit to provide working voltage for the LED control circuit, the PLC network expansion middleware is a second middleware, and the PLC network expansion middleware is connected with the PLC expansion module through an electric connection interface to receive communication data signals.
It will be appreciated that when the LED control circuit receives the communication data signal, the data line will generate a differential voltage with respect to GND, and the LED control circuit generates a communication connection status signal after receiving the differential voltage, and then controls the LED display lamp 250 to be turned on or off according to the operating voltage. Specifically, when the PLC device and the PLC network expansion module have data transmission, the LED display lamp 250 is turned on, and when there is no data transmission, the LED display lamp 250 is turned off.
In some embodiments, the PLC network expansion middleware further includes an RJ45 interface, configured to cascade with other PLC network expansion middleware through a network cable, and implement EtherCAT communication between the PLC device and each PLC network expansion module by using each cascaded PLC network expansion middleware. It is understood that the PLC network expansion module may be at least one of an input/output module, an analog conversion module, a temperature module, a weighing module, a position control module, etc., which is not limited in this embodiment.
In some embodiments of the present utility model, the LED control circuit further comprises a voltage division module 100 and a control module 200, wherein the control module 200 comprises an LED display lamp 250. Specifically, the voltage dividing module 100 divides the working voltage provided by the PLC device or the external power supply to obtain the bias voltage, the voltage dividing module 100 outputs the bias voltage to the control module 200, and the control module 200 controls the LED display lamp 250 to be turned on or off according to the communication connection status signal and the bias voltage, i.e. when the PLC device and the PLC network expansion module have data transmission, the LED display lamp 250 is turned on, and when the PLC device and the PLC network expansion module have no data transmission, the LED display lamp 250 is turned off.
Further, in some embodiments, the voltage dividing module 100 further includes a first resistor 110, a second resistor 120, and a first capacitor 130. Specifically, the first end of the first resistor 110 is connected to the first end of the first capacitor 130, the second end of the first capacitor 130 is grounded, and is used for filtering the working voltage to obtain a stable dc working voltage, the first end of the first resistor 110 also receives the working voltage, the first end of the second resistor 120 is connected to the second end of the first resistor 110, and the second end of the second resistor 120 is grounded, so that the working voltage is divided by the first resistor 110 and the second resistor 120 to obtain a bias voltage, and the bias voltage is output to the control module 200.
Further, in some embodiments, the control module 200 further includes a transistor 210, a third resistor 220, a fourth resistor 230, and a second capacitor 240. Specifically, the base of the triode 210 is connected to the second end of the first resistor 110 in the voltage dividing module 100, that is, the first end of the second resistor 120, for receiving the bias voltage, the collector of the triode 210 is connected to the first end of the third resistor 220 and the first end of the second capacitor 240, and the emitter of the triode 210 is connected to the first end of the fourth resistor 230; a second end of the third resistor 220 is connected to a cathode of the LED display lamp 250, an anode of the LED display lamp 250 receives an operating voltage, and a second end of the fourth resistor 230 and a second end of the second capacitor 240 are grounded.
It can be appreciated that, since the voltage on the transistor 210 is turned on when the threshold voltage is reached, the bias voltage controlled by the voltage dividing module 100 is smaller than the threshold voltage of the transistor 210 in the embodiment of the present utility model. Therefore, when no data is transmitted, the transistor 210 is not turned on, and thus the LED display lamp 250 is turned off; when there is data transmission, that is, a communication connection state signal is generated by receiving a communication data signal, the offset voltage and the differential voltage of the communication state reach the threshold voltage of the triode 210, so that the triode 210 is turned on to turn on the LED display lamp 250.
In some embodiments of the present utility model, the communication data signal includes an rd+ differential signal and a td+ differential signal, and referring to the LED control circuit schematic shown in fig. 2, in some embodiments, the LED control circuit further includes a capacitor module 300, and the capacitor module 300 includes a third capacitor 310. Specifically, the first end of the third capacitor 310 receives the rd+ differential signal, the second end of the third capacitor 310 is connected to the second end of the first resistor 110 in the voltage dividing module 100 and then connected to the base of the triode 210, or the first end of the third capacitor 310 receives the td+ differential signal, and the second end of the third capacitor 310 is connected to the second end of the first resistor 110 in the voltage dividing module 100 and then connected to the base of the triode 210.
For example, the resistance of the first resistor 110 is 75K, the resistance of the second resistor 120 is 11K, the capacitance of the first capacitor 130 is 0.1uF, the resistances of the third resistor 220 and the fourth resistor 230 are 1K, the capacitance of the second capacitor 240 is 0.1uF, and the capacitance of the third capacitor 310 is 1nF. The working voltage of the input voltage division module 100 is 3.3V, the bias voltage of 0.4V obtained by voltage division through the first resistor 110 and the second resistor 120 is output to the triode 210 of the control module 200, and the threshold voltage of the triode 210 is 0.7V, so that when no data is transmitted, the triode 210 is not conducted, and the LED display lamp 250 is turned off. When data transmission is performed, that is, when a communication data signal is received, a communication connection state signal is generated, the differential voltage on the communication data line is 1V, so that the differential voltage on a single data line has a voltage of 0.5V relative to GND, and at this time, the differential voltage is superimposed on the bias voltage to reach the threshold voltage of the triode 210, so that the triode 210 is turned on, and the LED display lamp 250 is turned on. The LED display lamp 250 is controlled to be turned on and off according to the driving triode 210, the problem that no logic level is driven on the PLC network expansion module is solved, a circuit is simple, and whether data transmission exists between the current PLC equipment and the PLC network expansion module can be judged only through the turning on and off of the LED.
In some embodiments of the utility model, the power supply circuit of the second resistance circuit further includes: the LED control circuit comprises a power input protection circuit and a voltage conversion circuit, wherein the power input protection circuit is connected with an external power supply, the original input voltage of the external power supply is subjected to power protection to obtain stable direct current input voltage, the voltage conversion circuit is connected with the power input protection circuit, the direct current input voltage is reduced to obtain working voltage, and the working voltage is input to the LED control circuit. The common power input protection circuit consists of a fuse, a reversed polarity protection diode, an input capacitor, a transient suppression diode and the like, and comprises an input protection circuit, an EMC suppression circuit and the like. The input protection circuit is used for protecting overcurrent and overvoltage in an alternating current input loop and limiting current; EMC suppression circuitry has two functions: firstly, external interference signals are restrained from entering a power supply system through a power grid; and secondly, the interference signals generated in the power supply are restrained from entering the power grid, so that the interference to other electrical equipment, a display and a microcomputer is avoided. The voltage conversion circuit converts the input voltage into a voltage range suitable for the circuit through the reference chip.
The original input voltage of the external power supply is subjected to EMC (electro magnetic compatibility) treatment through a fuse, a piezoresistor, a ceramic resistor, a common-mode inductor, a TVS (transient voltage suppressor) tube, a magnetic bead, a capacitor and the like of the power supply input protection circuit to obtain stable DC24V voltage, and the voltage conversion circuit reduces the 24V voltage to 3.3V through a TL432 voltage reference chip to obtain working voltage for the LED control circuit. It will be appreciated that the power input protection circuit is also advantageous in dealing with complex industrial electromagnetic interference environments.
In some embodiments of the present utility model, the PLC network expansion system further includes an external power source, the external power source and the second middleware are connected through a power interface, and referring to the PLC network expansion system schematic diagram shown in fig. 3, the PLC expansion module is further provided with a third connection interface, so that the third connection interface of the PLC expansion module is connected with the second connection interfaces of other PLC expansion modules, thereby adding different PLC expansion modules as needed to meet the functional requirements of industrial control.
In some embodiments of the present utility model, referring to the schematic diagram of the PLC network expansion system shown in fig. 4, the third connection interface of the PLC expansion module may be further connected to the electrical connection interface of the first middleware, and the external power supply of the second middleware cascaded in the closest distance provides the working voltage to the LED control circuit of the first middleware. It can be understood that based on the RJ45 interface, the first middleware can be continuously cascaded with other second middleware through a network cable, so that various PLC expansion modules or PLC network expansion middleware can be continuously added as required, and the compatibility of products is effectively improved.
The PLC network expansion middleware and the PLC network expansion system provided by the utility model, wherein the PLC network expansion middleware comprises an electric connection interface, two different resistance circuits are selected to correspond to two different versions of PLC network expansion middleware, the two different resistance circuits are correspondingly powered by a PLC device or an external power supply, the PLC network expansion middleware is only used as network connection, and can be compatible with other different PLC expansion modules with EtherCAT communication, and various PLC expansion modules are cascaded as required mainly through the two different PLC network expansion middleware, so that the commonality of products is effectively improved, data transmission can be completed without a processor and a PHY chip, the communication connection state of an LED display lamp is displayed, the circuit is simple, and the cost is reduced.
It should also be appreciated that the various embodiments provided by the embodiments of the present utility model may be arbitrarily combined to achieve different technical effects. While the preferred embodiments of the present utility model have been described in detail, the present utility model is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model.
Claims (10)
1. A PLC network expansion middleware, comprising:
an electrical connection interface;
a first resistor circuit;
the second resistor circuit comprises a power supply circuit, and the power supply circuit is used for being connected with an external power supply;
the LED control circuit comprises an LED display lamp;
when the first resistor circuit is selected to be attached, the PLC network expansion middleware is connected with a PLC device, the electrical connection interface is connected with the PLC device to receive communication data signals, and the PLC device provides working voltage for the LED control circuit;
when the second resistor circuit is selected, the PLC network expansion middleware is connected with the PLC expansion module, the electrical connection interface is connected with the PLC expansion module to receive communication data signals, and the external power supply provides working voltage for the LED control circuit;
and the LED control circuit is used for generating a communication connection state signal to control the on-off of the LED display lamp when receiving the communication data signal.
2. The PLC network expansion middleware of claim 1, further comprising: and the RJ45 interface is used for cascading with other PLC network expansion middleware through a network cable so as to realize EtherCAT communication by using the PLC network expansion middleware, and the communication data signals are EtherCAT communication signals.
3. The PLC network expansion middleware of claim 1, wherein the LED control circuit further comprises: the LED display device comprises a voltage division module and a control module, wherein the control module comprises an LED display lamp;
the voltage dividing module is used for dividing the working voltage to obtain bias voltage and outputting the bias voltage to the control module;
and the control module is used for controlling the LED display lamp to be turned on or off according to the communication connection state signal and the bias voltage.
4. The PLC network expansion middleware of claim 3, wherein the voltage dividing module comprises: the first resistor, the second resistor and the first capacitor;
the first end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is grounded, and the first end of the first resistor also receives the working voltage;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
5. The PLC network expansion middleware of claim 4, wherein the control module further comprises: the triode, the third resistor, the fourth resistor and the second capacitor;
the base electrode of the triode is connected with the second end of the first resistor, the collector electrode of the triode is connected with the first end of the third resistor and the first end of the second capacitor, and the emitter electrode of the triode is connected with the first end of the fourth resistor;
the second end of the third resistor is connected with the cathode of the LED display lamp, and the anode of the LED display lamp receives the working voltage;
a second end of the fourth resistor and a second end of the second capacitor are grounded.
6. The PLC network expansion middleware of claim 5, wherein the communication data signal comprises: RD+ differential signal and TD+ differential signal; the LED control circuit further includes: a capacitance module including a third capacitance;
the first end of the third capacitor receives RD+ differential signals, and the second end of the third capacitor is connected with the second end of the first resistor and then connected with the base electrode of the triode;
or (b)
And the first end of the third capacitor receives the TD+ differential signal, and the second end of the third capacitor is connected with the second end of the first resistor and then connected with the base electrode of the triode.
7. The PLC network expansion middleware of claim 1, wherein the power circuit further comprises: a power input protection circuit and a voltage conversion circuit;
the power input protection circuit is connected with the external power supply and is used for performing power protection on the original input voltage of the external power supply to obtain stable direct-current input voltage;
the voltage conversion circuit is connected with the power input protection circuit and is used for reducing the direct current input voltage to obtain the working voltage, and the working voltage is input to the LED control circuit.
8. A PLC network expansion system, wherein the PLC network expansion middleware according to any one of claims 1 to 7 is applied, comprising:
the PLC equipment is provided with a first connection interface;
the PLC expansion module is provided with a second connection interface;
the first middleware is used for selecting the first resistor circuit to be connected with the PLC equipment;
the second middleware is used for selecting the second resistor circuit to be connected with the PLC expansion module;
the first connecting interface of the PLC equipment is connected with the electrical connecting interface of the first middleware, the second connecting interface of the PLC expansion module is connected with the electrical connecting interface of the second middleware, and the first middleware is connected with the second middleware through a network cable so as to realize EtherCAT communication between the PLC equipment and the PLC expansion module.
9. The PLC network expansion system of claim 8, further comprising: the external power supply is connected with the second middleware;
the PLC expansion module is also provided with a third connection interface;
the third connection interface of the PLC expansion module is connected with the second connection interfaces of other PLC expansion modules.
10. The PLC network expansion system of claim 9, wherein the third connection interface of the PLC expansion module is connected to the electrical connection interface of the first middleware, and the external power source of the second middleware, which is cascaded at a closest distance, provides an operating voltage to the LED control circuit of the first middleware.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320274925.XU CN219659735U (en) | 2023-02-13 | 2023-02-13 | PLC network expansion middleware and PLC network expansion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320274925.XU CN219659735U (en) | 2023-02-13 | 2023-02-13 | PLC network expansion middleware and PLC network expansion system |
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| CN219659735U true CN219659735U (en) | 2023-09-08 |
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| CN202320274925.XU Active CN219659735U (en) | 2023-02-13 | 2023-02-13 | PLC network expansion middleware and PLC network expansion system |
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| CN (1) | CN219659735U (en) |
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