An industrial-grade wireless signal transmission device

Abstract

The utility model provides a kind of industrial grade wireless signal transmission device, it is related to industrial internet of things technical field, comprising: the input end of signal input circuit is connected to the sensor set on industrial equipment, output end is connected to main control chip, for sending sensing signal to main control chip;Wireless transmission module, access main control chip and with industrial controller wireless connection, for sending sensing signal to industrial controller and receiving the control signal issued by industrial controller;The input end of signal output circuit is connected to main control chip, output end is connected to the execution component on industrial equipment, for directly controlling execution component according to control signal.It is beneficial to provide wide voltage input through built-in signal input circuit, can connect various sensors in industrial environment, support direct current loop through built-in signal output circuit, can directly control execution component, without relying on relay to realize signal relay, improve the response speed and reliability of industrial grade wireless signal transmission device.

Description

Technical Field

[0001] This utility model relates to the field of industrial Internet of Things (IoT) technology, and in particular to an industrial-grade wireless signal transmission device. Background Technology

[0002] Industrial control systems, as the core of modern industrial automation, undertake critical tasks such as equipment monitoring, process control, and safety protection. In this scenario, digital input (DI) and digital output (DO) interfaces serve as the interaction bridge between wireless terminals and actuators (such as relays, solenoid valves, and motor drivers), and their performance directly determines the reliability and safety of the system.

[0003] However, the DI / DO interface designs of existing wireless terminals are generally based on consumer-grade or general industrial scenarios, failing to fully consider the special characteristics of the industrial environment, mainly in the following aspects:

[0004] The driving logic of industrial actuators typically relies on a specific DC voltage range (such as 12V, 24V, 48V DC) and must support both passive contact (dry contact) and active contact (wet contact) modes. Existing wireless terminal DI interfaces are mostly designed for a single voltage level (such as 5V TTL or 3.3V CMOS), and cannot directly support the 24V DC signals commonly found in industrial scenarios. This necessitates users configuring additional signal conditioning circuits (such as voltage divider resistors and optocoupler isolators), increasing system complexity and cost. Furthermore, the driving capability of DO interfaces is usually limited to milliamp-level current, making it difficult to directly drive high-power loads such as solenoid valves and contactors. Intermediate relays are required for signal conversion, further reducing system response speed and energy efficiency.

[0005] Therefore, there is an urgent need to design an industrial-grade wireless signal transmission device that can be applied to industrial scenarios. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides an industrial-grade wireless signal transmission device, comprising:

[0007] A signal input circuit, wherein the input end of the signal input circuit is connected to a sensor installed on an industrial device, and the output end is connected to a main control chip, for collecting the sensing signal of the sensor and sending it to the main control chip;

[0008] A wireless transmission module is connected to the main control chip and wirelessly connected to the industrial controller, used to send the sensing signals to the industrial controller and receive control signals sent by the industrial controller.

[0009] A signal output circuit, wherein the input terminal of the signal output circuit is connected to the main control chip and the output terminal is connected to the actuator on the industrial equipment, and is used to directly control the actuator according to the control signal.

[0010] Preferably, the signal input circuit includes:

[0011] An input switching circuit, wherein the input switching circuit can be selectively connected to the sensor via a first input terminal or a second input terminal;

[0012] The first NMOS transistor has its gate connected to the output terminal of the input switching circuit through a first resistor, its drain connected to the signal acquisition pin of the main control chip, and its source grounded.

[0013] The second resistor has one end connected to the gate of the first NMOS transistor and the other end grounded.

[0014] The first capacitor has one end connected to the gate of the first NMOS transistor and the other end grounded.

[0015] The third resistor has one end connected to a 3.3V voltage and the other end connected to the drain of the first NMOS transistor.

[0016] Preferably, the input switching circuit is a jumper cap with two pins. One pin of the jumper cap is connected to one end of a fourth resistor, and the other end of the fourth resistor serves as the first input terminal for connecting to a PNP type sensor. The other pin of the jumper cap serves as the second input terminal for connecting to an NPN type sensor.

[0017] Preferably, the signal input circuit further includes an input indicator circuit, the input indicator circuit comprising:

[0018] The fifth resistor has one end connected to the drain of the first NMOS transistor and the other end connected to the cathode of the first light-emitting diode. The anode of the first light-emitting diode is connected to the 3.3V voltage.

[0019] Preferably, the signal output circuit includes:

[0020] The second NMOS transistor has a sixth resistor connected between its gate and source. The gate of the second NMOS transistor is also connected to the control signal output pin of the main control chip through a seventh resistor. The source of the second NMOS transistor is grounded.

[0021] The relay has its first pin connected to the drain of the second NMOS transistor and the anode of the first diode. The cathode of the first diode is connected to the second pin of the relay and one end of the eighth resistor. The other end of the eighth resistor is connected to an internal power supply terminal. The fifth pin of the relay is connected to an external DC power supply and the cathode of the second diode. The anode of the second diode serves as the output terminal of the signal output circuit and is connected to the sixth pin of the relay.

[0022] Preferably, the signal output circuit further includes an output indicator circuit, the output indicator circuit comprising:

[0023] The ninth resistor has one end connected to the sixth pin of the relay and the other end connected to the anode of the second light-emitting diode, the cathode of the second light-emitting diode being grounded.

[0024] Preferably, it also includes a power supply module, the power supply module comprising:

[0025] A DC-to-DC converter chip, wherein the input voltage pin of the DC-to-DC converter chip is connected to an external DC power supply, and the input voltage pin is also grounded through a second capacitor and a third capacitor connected in parallel;

[0026] A fourth capacitor is connected between the switch output pin and the start pin of the DC-to-DC chip. The enable terminal is connected to the external DC power supply through the tenth resistor. The internal oscillator frequency control pin is grounded through the eleventh resistor. The compensation voltage input terminal is grounded through the fifth capacitor and the twelfth resistor connected in series.

[0027] The first inductor has one end connected to the switch output pin and the other end connected to the power supply pin of the main control chip as an internal power supply terminal. One end of the first inductor is also connected to the feedback voltage input terminal of the DC-to-DC chip through the thirteenth resistor. The feedback voltage input terminal is also grounded through the fourteenth resistor. The other end of the first inductor is also grounded through the sixth and seventh capacitors connected in parallel.

[0028] Preferably, the wireless transmission module is directly connected to the wireless gateway to wirelessly connect to the industrial controller through the wireless gateway;

[0029] or

[0030] The wireless transmission module is wirelessly connected to the wireless transmission modules of other industrial-grade wireless signal transmission devices, and then wirelessly connected to the directly connected wireless gateway through other industrial-grade wireless signal transmission devices, and further wirelessly connected to the wireless controller through the wireless gateway.

[0031] Preferred options also include:

[0032] The input interface receives a DC voltage of 12V-32V, and the input terminal of the signal input circuit is connected to the sensor through the input interface.

[0033] The output interface is used to directly connect the output terminal of the signal output circuit to the actuator.

[0034] Preferably, the wireless transmission module includes a main communication module and an auxiliary communication module, with one end of the main communication module and the auxiliary communication module connected to the main control chip and the other end connected to an antenna.

[0035] The above technical solution has the following advantages or beneficial effects: it provides a wide voltage input through the built-in signal input circuit, which can connect to various sensors in the industrial environment; it supports DC loop through the built-in signal output circuit, which can directly control the actuators without relying on relays to achieve signal relay, thereby improving the response speed and reliability of industrial-grade wireless signal transmission devices. Attached Figure Description

[0036] Figure 1 A schematic diagram of the structure of an industrial-grade wireless signal transmission device is shown in a preferred embodiment of this utility model.

[0037] Figure 2 The circuit diagram of the signal input circuit is shown in a preferred embodiment of this utility model.

[0038] Figure 3 The circuit diagram of the signal output circuit is shown in a preferred embodiment of this utility model.

[0039] Figure 4 The circuit diagram of the power supply module is shown in a preferred embodiment of this utility model. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0041] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, an industrial-grade wireless signal transmission device is provided, such as... Figure 1 As shown, it includes:

[0042] Signal input circuit 1, the input end of signal input circuit 1 is connected to the sensor installed on the industrial equipment, and the output end is connected to the main control chip 2, which is used to collect the sensor signal and send it to the main control chip 2;

[0043] The wireless transmission module 3 is connected to the main control chip 2 and wirelessly connected to the industrial controller. It is used to send sensor signals to the industrial controller and receive control signals sent by the industrial controller.

[0044] Signal output circuit 4 has its input terminal connected to the main control chip 2 and its output terminal connected to the actuators on the industrial equipment, and is used to directly control the actuators according to the control signal.

[0045] Specifically, in this embodiment, the input terminal of the signal input circuit 1 is connected to the sensor through the input interface 5. This input interface receives DC voltages of 12V-32V, providing a wide voltage input range that can cover common power levels in industrial scenarios, such as 12V DC, 24V DC, and 36V DC systems. It is compatible with the output voltages of sensors from different manufacturers (e.g., 24V DC is the industrial standard, while 12V DC is common in portable devices), thus enabling connection to various sensors in industrial environments. No additional signal conditioning circuits (such as voltage divider resistors or optocoupler isolators) are required during use, reducing complexity and cost. Simultaneously, the built-in signal output circuit 4 supports a DC loop, allowing direct control of actuators without relying on relays for signal relay, improving the response speed and reliability of the industrial-grade wireless signal transmission device.

[0046] Furthermore, by supporting a detection voltage range of 12V-32V, it is also compatible with industrial sensors of different signal types, including:

[0047] Passive contacts (dry contacts): such as mechanical switches, fiber sensors, etc., require external power supply (DC12-32V) to generate closing / opening signals;

[0048] Active contacts (wet contacts): such as proximity switches and photoelectric sensors, which directly output voltage signals (such as 24V DC high level).

[0049] In a preferred embodiment of this utility model, such as Figure 2 As shown, the signal input circuit 1 includes:

[0050] An input switching circuit is provided, which can be selectively connected to a sensor via a first input terminal or a second input terminal.

[0051] The gate of the first NMOS transistor N1 is connected to the output terminal of the input switching circuit 11 through the first resistor R1, the drain is connected to the signal acquisition pin of the main control chip 2, and the source is grounded.

[0052] The second resistor R2 has one end connected to the gate of the first NMOS transistor N1, and the other end grounded.

[0053] The first capacitor C1 has one end connected to the gate of the first NMOS transistor N1, and the other end grounded.

[0054] The third resistor R3 has one end connected to a 3.3V voltage and the other end connected to the drain of the first NMOS transistor N1.

[0055] In a preferred embodiment of this invention, the input switching circuit is a jumper cap TJ2 with two pins. One pin of the jumper cap TJ2 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 serves as the first input terminal for connecting to a PNP type sensor. The other pin of the jumper cap TJ2 serves as the second input terminal for connecting to an NPN type sensor.

[0056] Specifically, in this embodiment, the first input terminal is preferably able to receive a high-level sensor signal, such as a DC 24V sensor signal, and the second input terminal is preferably able to receive a low-level sensor signal, such as a DC 0V sensor signal.

[0057] The sensors installed on industrial equipment fall into two categories:

[0058] The first type is the PNP sensor. When the PNP sensor detects a target, its output terminal is connected to the positive terminal of the power supply (such as DC24V) to provide a high-level sensor signal. Therefore, if the sensor installed on the industrial equipment is a PNP sensor, it should be connected to the first input terminal during connection, and the jumper cap TJ2 should be used to switch the first input terminal to short-circuit the end of the first resistor R1 that is away from the gate of the first NMOS transistor N1.

[0059] The second type is the NPN sensor. When the NPN sensor detects a target, the output terminal is connected to the common terminal (such as 0V) to provide a low-level sensor signal. Therefore, if the sensor installed on the industrial equipment is an NPN sensor, it should be connected to the second input terminal during connection, and the jumper cap TJ2 should be used to switch the second input terminal to short-circuit the end of the first resistor R1 that is away from the gate of the first NMOS transistor N1.

[0060] Therefore, by switching via the jumper cap TJ2, it is compatible with both PNP and NPN sensor types.

[0061] Furthermore, considering that the operating voltage of the I / O port of the main control chip 2 is typically 3.3V, in order to receive sensor signals, a level switching circuit composed of the first NMOS transistor N1, the first resistor R1, the second resistor R2, the first capacitor C1, and the third resistor R3 is used to convert the 0-24V input sensor signal into a 0-3.3V I / O signal, which is then input to the main control chip 2. The first resistor R1 and the first capacitor C1 form an RC filter, which, together with the first NMOS transistor N1, eliminates spikes and glitches in the input sensor signal, achieving low circuit cost while ensuring the reliability of the input signal.

[0062] In a preferred embodiment of this utility model, the signal input circuit 1 further includes an input indicator circuit, which includes:

[0063] The fifth resistor R5 is connected at one end to the drain of the first NMOS transistor N1 and at the other end to the cathode of the first light-emitting diode FD1. The anode of the first light-emitting diode FD1 is connected to a 3.3V voltage.

[0064] Specifically, in this embodiment, the fifth resistor R5 and the first light-emitting diode FD1 serve as indicators of the input signal, facilitating observation during debugging.

[0065] In a preferred embodiment of this utility model, such as Figure 3 As shown, the signal output circuit 4 includes:

[0066] The second NMOS transistor N2 has a sixth resistor R6 connected between its gate and source. The gate of the second NMOS transistor N2 is also connected to the control signal output pin of the main control chip 2 through a seventh resistor R7. The source of the second NMOS transistor N2 is grounded.

[0067] Relay K has its first pin connected to the drain of the second NMOS transistor N2 and the anode of the first diode D1. The cathode of the first diode D1 is connected to the second pin of relay K and one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the internal power supply terminal. The fifth pin of relay K is connected to the external DC power supply and the cathode of the second diode D2. The anode of the second diode D2 serves as the output terminal of the signal output circuit and is connected to the sixth pin of relay K.

[0068] Specifically, considering that the output signal of the control signal output pin of the main control chip 2 is 0-3.3V, it cannot directly drive actuators (such as relays, solenoid valves, motor drivers, etc.). In this embodiment, a signal output circuit 4 is configured to convert the low-driving-capability 0-3.3V output signal into a 0-24V output signal, thereby realizing the function of controlling the switching of actuators. Preferably, the internal power supply terminal is connected to a 12V DC voltage. The external DC power supply is connected to a 24V DC voltage.

[0069] Among them, the sixth resistor R6, the seventh resistor R7, and the second NMOS transistor N2 constitute the drive circuit for the control terminal of relay K, enabling the main control chip 2 to control relay K. The first diode D2 and the second diode D4 serve as the input and output freewheeling diodes of relay K, respectively, to dissipate energy from the input coil or inductive load when the signal is turned off.

[0070] In a preferred embodiment of this utility model, the signal output circuit further includes an output indicator circuit, which includes:

[0071] The ninth resistor R9 is connected at one end to the sixth pin of relay K and at the other end to the anode of the second LED FD2. The cathode of the second LED FD2 is grounded.

[0072] Specifically, in this embodiment, the ninth resistor R9 and the second light-emitting diode FD2 serve as indicators at the output terminal, facilitating observation during debugging.

[0073] In a preferred embodiment of this utility model, a power supply module 8 is also included, such as... Figure 4 As shown, the power module 8 includes:

[0074] The DC-to-DC converter chip U has its input voltage pin VIN connected to an external DC power supply. The input voltage pin VIN is also grounded through the second capacitor C2 and the third capacitor C3 connected in parallel.

[0075] The DC-to-DC chip U has a fourth capacitor C4 connected between its switch output pin SW and its start pin BOOT. The enable terminal EN is connected to an external DC power supply through the tenth resistor R10. The internal oscillator frequency control pin RT is grounded through the eleventh resistor R11. The compensation voltage input terminal COMP is grounded through the fifth capacitor C5 and the twelfth resistor R12 connected in series.

[0076] The first inductor L has one end connected to the switch output pin SW, and the other end connected to the power supply pin of the main control chip 2 as an internal power supply terminal. One end of the first inductor L is also connected to the feedback voltage input terminal FB of the DC-to-DC chip U through the thirteenth resistor R13. The feedback voltage input terminal FB is also grounded through the fourteenth resistor R14. The other end of the first inductor L is also grounded through the sixth capacitor C6 and the seventh capacitor C7 connected in parallel.

[0077] Specifically, the standard power supply for traditional industrial equipment is AC220V. While universal, AC220V voltage can cause fatal electric shocks when in direct contact with the human body, especially in humid, dusty, or flammable / explosive industrial environments where the risk of leakage increases significantly. Although existing technologies can mitigate the risk through residual current devices (RCDs) or insulation monitoring, these protective measures still rely on regular maintenance and cannot completely eliminate hazards caused by equipment aging or installation defects. Furthermore, mechanical damage to AC220V cables (such as wear or compression) can cause short circuits or arcing, leading to fires or explosions. In addition, industrial power grids commonly experience interference such as voltage sags, harmonic distortion, and lightning surges, and AC220V power supplies are relatively weak at suppressing these disturbances. Therefore, in this embodiment, by incorporating a power module, the industrial-grade wireless signal transmission device of this invention can use DC power, effectively solving the problems of significant safety hazards and poor anti-interference capabilities associated with traditional AC220V power supplies.

[0078] The external DC power supply is preferably a wide-voltage DC power supply of 18V-32V, providing a stable and reliable power supply, and more preferably a 24V DC voltage. The industrial-grade wireless signal transmission device of this invention preferably features an aviation plug for direct power supply, offering higher safety and waterproofing levels, and allowing for quick plugging and unplugging, convenient assembly and disassembly, reducing labor costs and wiring error rates. The aforementioned DC-to-DC chip U, model RT2872GSP, converts the input DC24V power supply to DC12V, serving as the main power supply for the control system, providing power to the backend main control chip 2 and relay K. Furthermore, by providing an independent power module, isolated from the main power supply of the controlled components, system stability is ensured.

[0079] In a preferred embodiment of this utility model, the wireless transmission module 3 is directly connected to the wireless gateway so as to wirelessly connect to the industrial controller through the wireless gateway.

[0080] or

[0081] Wireless transmission module 3 is wirelessly connected to the wireless transmission modules of other industrial-grade wireless signal transmission devices, and then wirelessly connected to the directly connected wireless gateway through other industrial-grade wireless signal transmission devices, and then wirelessly connected to the wireless controller through the wireless gateway.

[0082] Specifically, in this embodiment, the configured wireless transmission module 3 enables the industrial-grade wireless signal transmission device to communicate directly with the wireless gateway and also communicate with other industrial-grade wireless signal transmission devices, enriching the networking methods of industrial-grade wireless signal transmission devices and improving network reliability and scalability. The wireless transmission module 3 supports wireless communication methods such as Wi-Fi and Bluetooth.

[0083] More preferably, the networking methods of the industrial-grade wireless signal transmission device of this utility model include the following:

[0084] 1. The industrial-grade wireless signal transmission device of this utility model is equipped with a networking button. When networking is required, the operator does not need a complicated setup process. He / she can simply trigger the networking button to start the networking process, realize direct wireless communication with the wireless gateway, or indirect wireless communication with the wireless gateway through other industrial-grade wireless signal transmission devices. No wiring is required, which greatly simplifies the cumbersome wiring process in traditional networking methods, completely frees the user from the constraints of cables, reduces deployment costs, and significantly improves deployment efficiency.

[0085] 2. The industrial-grade wireless signal transmission device of this invention is affixed with a QR code or barcode, which contains the device's ID information. In practical applications, operators only need to scan the QR code or barcode using the scanner provided on the device to quickly obtain the device's ID information. Once the ID information is obtained, it is automatically transmitted to the wireless gateway. As the core control node of the entire industrial wireless network, the wireless gateway can quickly identify and manage the device based on the received ID information. In this way, the entire networking process can be completed in a very short time, greatly reducing the time for devices to access the network and improving the response speed of industrial production. Furthermore, the scanner, as a highly efficient and accurate identification tool, can accurately read the information in the identification code in a short time, avoiding errors and tediousness that may result from manual input.

[0086] 3. When a wireless gateway needs to build or expand a wireless network, it broadcasts a network setup command to the surrounding area. The wireless transmission module 3 of the industrial-grade wireless signal transmission device of this utility model can receive the network setup command. Once the network setup command is received, the device will immediately detect and analyze the surrounding wireless signal environment. Among them, the device will focus on detecting the signal strength of the wireless gateway and the signal strength of other industrial-grade wireless signal transmission devices. Then, based on the signal strength, it will choose to conduct direct wireless communication with the wireless gateway (if the signal strength of the wireless gateway is detected to be strong) or conduct indirect wireless communication with the wireless gateway through other industrial-grade wireless signal transmission devices (if the signal strength of other nearby industrial-grade wireless signal transmission devices is detected to be strong), and then automatically set up the network.

[0087] In a preferred embodiment of this utility model, it further includes:

[0088] Output interface 6: The output terminal of signal output circuit 4 is directly connected to the actuator through output interface 6.

[0089] In a preferred embodiment of the present invention, the wireless transmission module 3 includes a main communication module 31 and an auxiliary communication module 32. One end of the main communication module 31 and the auxiliary communication module 32 are connected to the main control chip 2, and the other end is connected to the antenna 7.

[0090] Specifically, in this embodiment, the main communication module 31 and the auxiliary communication module 32 can be switched automatically by the main control chip according to the signal strength, thereby improving communication reliability.

[0091] In a preferred embodiment of this invention, an RS485 interface is also included, connected to the main control chip, enabling data communication with other devices and supporting the Modbus RTU communication protocol. For example, data can be remotely read via the RS485 interface and then directly sent to the industrial controller PLC via a gateway. The Modbus RTU communication protocol can be batch modified directly by the industrial controller PLC via the RS485 interface without requiring a host computer and serial cables for sequential connection and modification. Two RS485 interfaces are reserved, one as the primary interface and the other as a backup interface.

[0092] In a preferred embodiment of the present invention, a display screen is also included for displaying, but not limited to, device status, fault information, and collected data.

[0093] In a preferred embodiment of this utility model, multiple indicator lights are also included for functions including but not limited to power-on indication, connection indication, and fault indication.

[0094] In a preferred embodiment of this utility model, a wired port is also provided for connecting to the main control chip. If the wireless cannot be used due to force majeure or the terminal fails, the wired port can be used as a backup port.

[0095] In a preferred embodiment of this utility model, both the signal input circuit and the signal output circuit are two-way, one of which is the main one and the other is the backup one.

[0096] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. An industrial-grade wireless signal transmission device, characterized in that, include: A signal input circuit, wherein the input end of the signal input circuit is connected to a sensor installed on an industrial device, and the output end is connected to a main control chip, for collecting the sensing signal of the sensor and sending it to the main control chip; A wireless transmission module is connected to the main control chip and wirelessly connected to the industrial controller, used to send the sensing signals to the industrial controller and receive control signals sent by the industrial controller. A signal output circuit, wherein the input terminal of the signal output circuit is connected to the main control chip and the output terminal is connected to the actuator on the industrial equipment, and is used to directly control the actuator according to the control signal.

2. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, The signal input circuit includes: An input switching circuit, wherein the input switching circuit can be selectively connected to the sensor via a first input terminal or a second input terminal; The first NMOS transistor has its gate connected to the output terminal of the input switching circuit through a first resistor, its drain connected to the signal acquisition pin of the main control chip, and its source grounded. The second resistor has one end connected to the gate of the first NMOS transistor and the other end grounded. The first capacitor has one end connected to the gate of the first NMOS transistor and the other end grounded. The third resistor has one end connected to a 3.3V voltage and the other end connected to the drain of the first NMOS transistor.

3. The industrial-grade wireless signal transmission device according to claim 2, characterized in that, The input switching circuit is a jumper cap with two pins. One pin of the jumper cap is connected to one end of a fourth resistor, and the other end of the fourth resistor serves as the first input terminal for connecting to a PNP type sensor. The other pin of the jumper cap serves as the second input terminal for connecting to an NPN type sensor.

4. The industrial-grade wireless signal transmission device according to claim 2, characterized in that, The signal input circuit further includes an input indicator circuit, which includes: The fifth resistor has one end connected to the drain of the first NMOS transistor and the other end connected to the cathode of the first light-emitting diode. The anode of the first light-emitting diode is connected to the 3.3V voltage.

5. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, The signal output circuit includes: The second NMOS transistor has a sixth resistor connected between its gate and source. The gate of the second NMOS transistor is also connected to the control signal output pin of the main control chip through a seventh resistor. The source of the second NMOS transistor is grounded. The relay has its first pin connected to the drain of the second NMOS transistor and the anode of the first diode. The cathode of the first diode is connected to the second pin of the relay and one end of the eighth resistor. The other end of the eighth resistor is connected to an internal power supply terminal. The fifth pin of the relay is connected to an external DC power supply and the cathode of the second diode. The anode of the second diode serves as the output terminal of the signal output circuit and is connected to the sixth pin of the relay.

6. The industrial-grade wireless signal transmission device according to claim 5, characterized in that, The signal output circuit further includes an output indicator circuit, which includes: The ninth resistor has one end connected to the sixth pin of the relay and the other end connected to the anode of the second light-emitting diode, the cathode of the second light-emitting diode being grounded.

7. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, It also includes a power module, which comprises: A DC-to-DC converter chip, wherein the input voltage pin of the DC-to-DC converter chip is connected to an external DC power supply, and the input voltage pin is also grounded through a second capacitor and a third capacitor connected in parallel; A fourth capacitor is connected between the switch output pin and the start pin of the DC-to-DC chip. The enable terminal is connected to the external DC power supply through the tenth resistor. The internal oscillator frequency control pin is grounded through the eleventh resistor. The compensation voltage input terminal is grounded through the fifth capacitor and the twelfth resistor connected in series. The first inductor has one end connected to the switch output pin and the other end connected to the power supply pin of the main control chip as an internal power supply terminal. One end of the first inductor is also connected to the feedback voltage input terminal of the DC-to-DC chip through the thirteenth resistor. The feedback voltage input terminal is also grounded through the fourteenth resistor. The other end of the first inductor is also grounded through the sixth and seventh capacitors connected in parallel.

8. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, The wireless transmission module is directly connected to the wireless gateway so as to wirelessly connect to the industrial controller through the wireless gateway; or The wireless transmission module is wirelessly connected to the wireless transmission modules of other industrial-grade wireless signal transmission devices, and then wirelessly connected to the directly connected wireless gateway through other industrial-grade wireless signal transmission devices, and further wirelessly connected to the industrial controller through the wireless gateway.

9. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, Also includes: The input interface receives a DC voltage of 12V-32V, and the input terminal of the signal input circuit is connected to the sensor through the input interface. The output interface is used to directly connect the output terminal of the signal output circuit to the actuator.

10. The industrial-grade wireless signal transmission device according to claim 1, characterized in that, The wireless transmission module includes a main communication module and an auxiliary communication module. One end of the main communication module and the auxiliary communication module are connected to the main control chip, and the other end is connected to an antenna.

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