Eight-channel 0-10V voltage output remote control circuit

Abstract

The utility model discloses an 8-channel 0-10V voltage output remote control circuit, which comprises a master control MCU (Microprogrammed Control Unit), an analog voltage output circuit, an output anomaly detection circuit, a level conversion circuit, an NB-IoT (Narrow Band Internet of Things) module circuit and an RS-485 differential transceiver circuit, and is characterized in that the output end of the level conversion circuit is respectively connected with the input end of the analog voltage output circuit and the input end of the master control MCU; the output end of the analog voltage output circuit is connected with the input end of the output anomaly detection circuit, the output end of the output anomaly detection circuit is connected with the input end of the master control MCU, the output end of the master control MCU is connected with the input end of the analog voltage output circuit, the master control MCU is connected with the NB-IoT module circuit and the RS-485 differential transceiver circuit, and the NB-IoT module circuit is connected with the RS-485 differential transceiver circuit. The NB-IoT module circuit is in communication connection with a cloud platform in a wireless mode, and the RS-485 differential transceiver circuit is connected with external equipment. According to the utility model, 8 paths of 0-10V voltage signals can be stably output, a remote control function and a remote monitoring function are realized, and the overall safety and reliability of module equipment are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to 0 10V analog voltage signal technical field, especially 8 channel 0 10V voltage output remote control circuit. BACKGROUND

[0002] 0 10V analog voltage signal can realize higher precision, can satisfy most industrial control system's demand, the application in new infrastructure further promotes the development of industrial automation and intelligent manufacturing, to 0 10V analog voltage output module equipment's security, stability, reliability and convenient intelligent management has put forward higher requirement.0 10V analog voltage output module equipment belongs to field equipment, how to control, monitor and maintain the equipment better has been a problem to be solved, and the equipment works in complex and changeable environment even some serious harm to human body, the existing 0 10V analog voltage output module equipment lacks remote control and monitoring, can only be maintained by field personnel, make the maintenance work requirement higher. Therefore, an urgent need for a remote control function to remotely control and monitor the equipment, and the equipment and cloud platform connection is more stable and the equipment stable output signal. UTILITY MODEL CONTENT

[0003] The utility model aims at above problem, the utility model aims at providing a kind of 8 channel 0 10V voltage output remote control circuit, realizes the remote control and monitoring of 0 10V analog voltage output signal.

[0004] Technical scheme: the utility model discloses a kind of 8 channel 0 10V voltage output remote control circuit, including main control MCU, analog voltage output circuit, output abnormality detection circuit, level conversion circuit, NB-IoT module circuit and RS-485 differential transceiver circuit, wherein the output end of level conversion circuit is connected the input end of analog voltage output circuit and the input end of main control MCU respectively, the output end of analog voltage output circuit is connected the input end of output abnormality detection circuit, the output end of output abnormality detection circuit is connected the input end of main control MCU, the output end of main control MCU is connected the input end of analog voltage output circuit, main control MCU connects NB-IoT module circuit and RS-485 differential transceiver circuit, NB-IoT module circuit is connected with cloud platform communication by wireless mode, RS-485 differential transceiver circuit connects external equipment;

[0005] If abnormal condition appears in voltage signal output process, main control MCU reports abnormal condition to cloud platform by NB-IoT module circuit, displays fault prompt in cloud platform, and simultaneously abnormal condition is sent to external equipment by RS-485 differential transceiver circuit to carry out fault prompt.

[0006] Further, the output abnormality detection circuit comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a third capacitor and a fourth transistor output optocoupler;

[0007] Wherein one end of the eighteenth resistor is connected to the 20 pin of the power electronic switch in the analog voltage output circuit, the other end of the eighteenth resistor is connected to the one end of the nineteenth resistor, the one end of the third capacitor and the one pin of the fourth transistor output optocoupler respectively, the other end of the nineteenth resistor is connected to the one end of the twentieth resistor, the other end of the third capacitor and the two pin of the fourth transistor output optocoupler respectively, the other end of the twentieth resistor is connected to the analog ground, the four pin of the fourth transistor output optocoupler is connected to the 3.3V power supply, the three pin of the fourth transistor output optocoupler is connected to the IO port of the master MCU and the one end of the twenty-first resistor respectively, the other end of the twenty-first resistor is connected to the digital ground.

[0008] Further, the NB-IoT module circuit comprises an NB-IoT module, a four-way ESD protection array, a SIM card connector, a first NPN triode, a second NPN triode, a fourth NPN triode, a third PMOS tube, a first RF coaxial connector, a first light emitting diode, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor and a forty-fourth resistor;

[0009] The 1, 27, 34, 36, 37, 40 and 41 pins of the NB-IoT module are connected to the digital ground, the 7 pin of the NB-IoT module is connected to one end of the forty-fourth resistor, and the other end of the forty-fourth resistor is connected to the digital ground; the 10 pin of the NB-IoT module is connected to one end of the nineteenth capacitor and the C5 pin of the SIM card connector, respectively; the 11 pin of the NB-IoT module is connected to one end of the thirty-third resistor and one end of the thirty-first resistor, respectively, and the other end of the thirty-first resistor is connected to one end of the fourteenth capacitor, the 4 pin of the four-way ESD protection array and the C7 pin of the SIM card connector, respectively; the 12 pin of the NB-IoT module is connected to one end of the thirty-second resistor, and the other end of the thirty-second resistor is connected to one end of the thirteenth capacitor, the 3 pin of the four-way ESD protection array and the C2 pin of the SIM card connector, respectively; the 13 pin of the NB-IoT module is connected to one end of the thirtieth resistor, and the other end of the thirtieth resistor is connected to one end of the fifteenth capacitor, the 5 pin of the four-way ESD protection array and the C3 pin of the SIM card connector, respectively; the 14 pin of the NB-IoT module is connected to the other end of the thirty-third resistor and the other end of the nineteenth capacitor, one end of the twelfth capacitor, the 1 pin of the four-way ESD protection array and the C1 pin of the SIM card connector, respectively, and the other end of the twelfth capacitor, the other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are connected to the digital ground, and the 0 pin of the SIM card connector is connected to the digital ground; the 15 pin of the NB-IoT module is connected to the collector of the first NPN triode, the base of the first NPN triode is connected to one end of the thirty-fourth resistor and one end of the thirty-fifth resistor, respectively, and the other end of the thirty-fourth resistor is connected to the IO port of the host MCU, and the emitter of the first NPN triode is connected to the digital ground and the other end of the thirty-fifth resistor, respectively; the 17 pin of the NB-IoT module is connected to one end of the thirty-sixth resistor, and the other end of the thirty-sixth resistor is connected to the IO port of the host MCU; the 18 pin of the NB-IoT module is connected to one end of the thirty-seventh resistor, and the other end of the thirty-seventh resistor is connected to the IO port of the host MCU; the 24 pin of the NB-IoT module is connected to one end of the thirty-eighth resistor, and the other end of the thirty-eighth resistor is connected to one end of the fortieth resistor and the base of the second NPN triode, respectively, the emitter of the second NPN triode is connected to the digital ground and the other end of the fortieth resistor, respectively, the collector of the second NPN triode is connected to the negative electrode of the first light-emitting diode, the positive electrode of the first light-emitting diode is connected to one end of the thirty-ninth resistor, and the other end of the thirty-ninth resistor is connected to the 3.3V power supply; the 35 pin of the NB-IoT module is connected to the 1 pin of the first RF coaxial connector, and the 2 pin of the first RF coaxial connector is connected to the digital ground; the 42 pin and the 43 pin of the NB-IoT module are connected to the 3.3V power supply of the NB-IoT module, one end of the sixteenth capacitor, one end of the seventeenth capacitor and one end of the eighteenth capacitor, and the other end of the sixteenth capacitor, the other end of the seventeenth capacitor and the other end of the eighteenth capacitor are connected to the digital ground;

[0010] The base of the fourth NPN triode is connected to one end of the forty-first resistor and one end of the forty-third resistor, respectively, the other end of the forty-first resistor is connected to the IO port of the master MCU, the emitter of the fourth NPN triode is connected to the digital ground and the other end of the forty-third resistor, respectively, the collector of the fourth NPN triode is connected to the gate of the third PMOS tube and one end of the forty-second resistor, respectively, the other end of the forty-second resistor is connected to the 3.3V power supply and the source of the third PMOS tube, respectively, and the drain of the third PMOS tube is connected to the 3.3V power supply of the NB-IoT module.

[0011] Further, the RS-485 differential transceiver circuit includes an RS-485 transceiver, a forty-fifth resistor, a forty-sixth resistor, a forty-seventh resistor, a forty-ninth resistor, a thirty-second capacitor, a second light-emitting diode, and a tenth terminal;

[0012] Wherein the 1, 2, 3, 4 pins of the RS-485 transceiver are connected to the IO port of the master MCU, the 5 pin of the RS-485 transceiver is connected to the digital ground, the 6 pin of the RS-485 transceiver is connected to one end of the forty-sixth resistor, one end of the forty-seventh resistor, and the 2 pin of the tenth terminal, respectively, the other end of the forty-seventh resistor is connected to the 3.3V power supply, the 7 pin of the RS-485 transceiver is connected to the other end of the forty-sixth resistor, one end of the forty-fifth resistor, and the 1 pin of the tenth terminal, respectively, the other end of the forty-fifth resistor is connected to the digital ground and one end of the thirty-second capacitor, respectively, the 8 pin of the RS-485 transceiver is connected to the 3.3V power supply and the other end of the forty-seventh capacitor, respectively; one end of the forty-ninth resistor is connected to the 3.3V power supply, the other end of the forty-ninth resistor is connected to the positive electrode of the second light-emitting diode, and the negative electrode of the second light-emitting diode is connected to the IO port of the master MCU.

[0013] Further, the analog voltage output circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a first capacitor, a second capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a first zener diode, a second zener diode, a third zener diode, a fourth zener diode, a fifth zener diode, a sixth zener diode, a seventh zener diode, an eighth zener diode, a first transistor output optocoupler, a second transistor output optocoupler, a third power electronic switch, a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal.

[0014] The 1 pin of the first transistor output optocoupler is connected to one end of the first resistor, the other end of the first resistor is connected to the IO port of the host MCU; the 2, 4, 6, 8 pins of the first transistor output optocoupler are connected to digital ground; the 3 pin of the first transistor output optocoupler is connected to one end of the second resistor, the other end of the second resistor is connected to the IO port of the host MCU; the 5 pin of the first transistor output optocoupler is connected to one end of the third resistor, the other end of the third resistor is connected to the IO port of the host MCU; the 7 pin of the first transistor output optocoupler is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the IO port of the host MCU; the 10, 12, 14, 16 pins of the first transistor output optocoupler are connected to the 5V power supply; the 9 pin of the first transistor output optocoupler is connected to one end of the twelfth resistor, the other end of the twelfth resistor is connected to the 9 pin of the third power electronic switch; the 11 pin of the first transistor output optocoupler is connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to the 8 pin of the third power electronic switch; the 13 pin of the first transistor output optocoupler is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the 7 pin of the third power electronic switch; the 15 pin of the first transistor output optocoupler is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to the 6 pin of the third power electronic switch;

[0015] The 1 pin of the second transistor output optocoupler is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the IO port of the host MCU; the 2, 4, 6, 8 pins of the second transistor output optocoupler are connected to digital ground; the 3 pin of the second transistor output optocoupler is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the IO port of the host MCU; the 5 pin of the second transistor output optocoupler is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the IO port of the host MCU; the 7 pin of the second transistor output optocoupler is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the IO port of the host MCU; the 10, 12, 14, 16 pins of the second transistor output optocoupler are connected to the 5V power supply; the 9 pin of the second transistor output optocoupler is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the 13 pin of the third power electronic switch; the 11 pin of the second transistor output optocoupler is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to the 12 pin of the third power electronic switch; the 13 pin of the second transistor output optocoupler is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to the 11 pin of the third power electronic switch; the 15 pin of the second transistor output optocoupler is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to the 10 pin of the third power electronic switch;

[0016] The 1st pin of the third power electronic switch is connected with one end of the first capacitor, the positive pole of the second capacitor and the analog input voltage, the other end of the first capacitor is connected with the analog ground, the other end of the second capacitor is connected with the analog ground, the 19th pin of the power electronic switch is connected with one end of the 17th resistor, the other end of the 17th resistor is connected with the analog ground, one end of the 22nd resistor, one end of the 23rd resistor, one end of the 24th resistor, one end of the 25th resistor, one end of the 26th resistor, one end of the 27th resistor, one end of the 28th resistor and one end of the 29th resistor are connected with the analog ground, one end of the 4th capacitor, one end of the 5th capacitor, one end of the 6th capacitor, one end of the 7th capacitor, one end of the 8th capacitor, one end of the 9th capacitor, one end of the 10th capacitor and one end of the 11th capacitor are connected with the analog ground, the positive poles of the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th and 8th voltage stabilizing diodes are connected with the analog ground, the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th and 8th terminals are connected with the analog ground, the 21st and 22nd pins of the third power electronic switch are connected with the other end of the 29th resistor, the other end of the 11th capacitor, the negative pole of the 8th voltage stabilizing diode and the 2nd pin of the 8th terminal, the 23rd and 24th pins of the third power electronic switch are connected with the other end of the 28th resistor, the other end of the 10th capacitor, the negative pole of the 7th voltage stabilizing diode and the 2nd pin of the 7th terminal, the 25th and 26th pins of the third power electronic switch are connected with the other end of the 27th resistor, the other end of the 9th capacitor, the negative pole of the 6th voltage stabilizing diode and the 2nd pin of the 6th terminal, the 27th and 28th pins of the third power electronic switch are connected with the other end of the 26th resistor, the other end of the 8th capacitor, the negative pole of the 5th voltage stabilizing diode and the 2nd pin of the 5th terminal, the 29th and 30th pins of the third power electronic switch are connected with the other end of the 25th resistor, the other end of the 7th capacitor, the negative pole of the 4th voltage stabilizing diode and the 2nd pin of the 4th terminal, the 31st and 32nd pins of the third power electronic switch are connected with the other end of the 24th resistor, the other end of the 6th capacitor, the negative pole of the 3rd voltage stabilizing diode and the 2nd pin of the 3rd terminal, the 33rd and 34th pins of the third power electronic switch are connected with the other end of the 23rd resistor, the other end of the 5th capacitor, the negative pole of the 2nd voltage stabilizing diode and the 2nd pin of the 2nd terminal, the 35th and 36th pins of the third power electronic switch are connected with the other end of the 22nd resistor, the other end of the 4th capacitor, the negative pole of the 1st voltage stabilizing diode and the 2nd pin of the 1st terminal.

[0017] Advantages: Compared with the prior art, the utility model has the following remarkable advantages:

[0018] The utility model discloses a remote control circuit of 8 channel 0-10V voltage output, which comprises a main control MCU, an NB-IoT module circuit, an RS-485 differential transceiver circuit, an analog voltage output circuit, an output exception detection circuit, a level conversion circuit and a power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a circuit connection diagram of the remote control circuit of 8 channel 0-10V voltage output in the embodiment.

[0020] Figure 2 FIG. 2 is a circuit connection schematic diagram of the level conversion circuit in the embodiment.

[0021] Figure 3 FIG. 3 is a circuit connection schematic diagram of the output exception detection circuit in the embodiment.

[0022] Figure 4 FIG. 4 is a circuit connection schematic diagram of the NB-IoT module circuit in the embodiment.

[0023] Figure 5 FIG. 5 is a circuit connection schematic diagram of the RS-485 differential transceiver circuit in the embodiment.

[0024] Figure 6 FIG. 6 is a circuit connection schematic diagram of the analog voltage output circuit in the embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments.

[0026] The remote control circuit of 8 channel 0-10V voltage output described in the embodiment has the advantages that the circuit is connected between the main control MCU, the NB-IoT module circuit and the RS-485 differential transceiver circuit, and the main control MCU is connected with the cloud platform through the NB-IoT module circuit and connected with the external equipment through the RS-485 differential transceiver circuit. Figure 1As shown, the control circuit includes a master MCU, an analog voltage output circuit, an output abnormality detection circuit, a level conversion circuit, an NB-IoT module circuit and an RS-485 differential transceiver circuit, wherein the output end of the level conversion circuit is connected to the input end of the analog voltage output circuit and the input end of the master MCU respectively, the output end of the analog voltage output circuit is connected to the input end of the output abnormality detection circuit, the output end of the output abnormality detection circuit is connected to the input end of the master MCU, the output end of the master MCU is connected to the input end of the analog voltage output circuit, the master MCU is connected to the NB-IoT module circuit and the RS-485 differential transceiver circuit, the NB-IoT module circuit is connected to the cloud platform in a wireless mode, and the RS-485 differential transceiver circuit is connected to an external device;

[0027] If an abnormal situation occurs during the voltage signal output process, the master MCU reports the abnormal situation to the cloud platform through the NB-IoT module circuit, displays a fault prompt in the cloud platform, and sends the abnormal situation to the external device through the RS-485 differential transceiver circuit to prompt the fault.

[0028] The level conversion circuit is used to convert the provided power supply into the level required by each part of the circuit to make each circuit work normally. Figure 2 As shown, the level conversion circuit includes a seventh DC-DC power supply chip U7, an eighth DC-DC power supply chip U8, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a thirtieth capacitor C30, a thirty-first capacitor C31, a forty-eighth resistor R48, a tenth switching diode D10, an eleventh freewheeling diode D11, a first energy storage inductor L1 and an eleventh terminal P11.

[0029] The 1st pin of the eighth DC-DC power chip U8 is connected with the positive pole of the twentieth capacitor C20 and the negative pole of the tenth switch diode D10 respectively; the 3rd, 5th and 6th pins of the eighth DC-DC power chip U8 and the negative pole of the twentieth capacitor C20 are connected with digital ground, the positive pole of the tenth switch diode D10 is connected with the 2nd pin of the eleventh terminal P11, and the 1st pin of the eleventh terminal P11 is connected with digital ground; the 2nd pin of the eighth DC-DC power chip U8 is connected with the negative pole of the eleventh freewheeling diode D11 and one end of the first energy storage inductor L1 respectively, and the positive pole of the eleventh freewheeling diode D11 is connected with digital ground; the 4th pin of the eighth DC-DC power chip U8 is connected with the other end of the first energy storage inductor L1, the 3rd pin of the seventh DC-DC power chip U7, the positive pole of the twenty-first capacitor C21, the positive pole of the twenty-second capacitor C22, one end of the twenty-third capacitor C23, one end of the twenty-fourth capacitor C24 and the 5V power supply respectively; the 1st pin of the seventh DC-DC power chip U7 is connected with the negative pole of the twenty-first capacitor C21, the negative pole of the twenty-second capacitor C22, the other end of the twenty-third capacitor C23, the other end of the twenty-fourth capacitor C24, the negative pole of the twenty-fifth capacitor C25, one end of the twenty-sixth capacitor C26, one end of the twenty-seventh capacitor C27, one end of the twenty-eighth capacitor C28, one end of the twenty-ninth capacitor C29 and digital ground respectively, and the positive pole of the twenty-fifth capacitor C25, the other end of the twenty-sixth capacitor C26, the other end of the twenty-seventh capacitor C27, the other end of the twenty-eighth capacitor C28, the other end of the twenty-ninth capacitor C29 and the 2nd and 4th pins of the seventh DC-DC power chip U7 are connected with the 3.3V power supply; the positive pole of the thirtieth capacitor C30 is connected with the 2nd pin of the eleventh terminal P11, one end of the thirty-first capacitor C31 and the analog input voltage, the negative pole of the thirtieth capacitor C30 is connected with one end of the forty-eighth resistor R48 and digital ground, and the other end of the forty-eighth resistor R48 is connected with the other end of the thirty-first capacitor C31 and analog ground respectively.

[0030] As shown in Figure 3 , the output abnormality detection circuit comprises an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a third capacitor C3 and a fourth transistor output optocoupler U4.

[0031] One end of the eighteenth resistor R18 is connected to the 20 pin of the power electronic switch U3S in the analog voltage output circuit, the other end of the eighteenth resistor R18 is connected to one end of the nineteenth resistor R19, one end of the third capacitor C3 and the 1 pin of the fourth transistor output optocoupler U4 respectively, the other end of the nineteenth resistor R19 is connected to one end of the twentieth resistor R20, the other end of the third capacitor C3 and the 2 pin of the fourth transistor output optocoupler U4 respectively, the other end of the twentieth resistor R20 is connected to the analog ground, the 4 pin of the fourth transistor output optocoupler U4 is connected to the 3.3V power supply, the 3 pin of the fourth transistor output optocoupler U4 is connected to the IO port of the master MCU and one end of the twenty-first resistor R21 respectively, the other end of the twenty-first resistor R21 is connected to the digital ground.

[0032] As shown in Figure 4 The NB-IoT module circuit includes an NB-IoT module U5, a four-way ESD protection array D9, a SIM card connector P9, a first NPN triode Q1, a second NPN triode Q2, a fourth NPN triode Q4, a third PMOS tube Q3, a first RF coaxial connector RF1, a first light-emitting diode LED1, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, a forty-first resistor R41, a forty-second resistor R42, a forty-third resistor R43 and a forty-fourth resistor R44;

[0033] Wherein the 1, 27, 34, 36, 37, 40 and 41 pins of the NB-IoT module are connected to the digital ground, the 7 pin of the NB-IoT module U5 is connected to one end of the forty-fourth resistor R44, and the other end of the forty-fourth resistor R44 is connected to the digital ground; the 10 pin of the NB-IoT module U5 is connected to one end of the nineteenth capacitor C19 and the C5 pin of the SIM card connector P9, respectively; the 11 pin of the NB-IoT module U5 is connected to one end of the thirty-third resistor R33 and one end of the thirty-first resistor R31, respectively, the other end of the thirty-first resistor R31 is connected to one end of the fourteenth capacitor C14, the 4 pin of the four-way ESD protection array D9 and the C7 pin of the SIM card connector P9, respectively; the 12 pin of the NB-IoT module U5 is connected to one end of the thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected to one end of the thirteenth capacitor C13, the 3 pin of the four-way ESD protection array D9 and the C2 pin of the SIM card connector P9, respectively; the 13 pin of the NB-IoT module U5 is connected to one end of the thirtieth resistor R30, and the other end of the thirtieth resistor R30 is connected to one end of the fifteenth capacitor C15, the 5 pin of the four-way ESD protection array D9 and the C3 pin of the SIM card connector P9, respectively; the 14 pin of the NB-IoT module U5 is connected to the other end of the thirty-third resistor R33 and the other end of the nineteenth capacitor C19, one end of the twelfth capacitor C12, the 1 pin of the four-way ESD protection array D9 and the C1 pin of the SIM card connector P9, respectively, the other end of the twelfth capacitor C12, the other end of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14 and the other end of the fifteenth capacitor C15 are connected to the digital ground, and the 0 pin of the SIM card connector P9 is connected to the digital ground; the 15 pin of the NB-IoT module U5 is connected to the collector of the first NPN transistor Q1, the base of the first NPN transistor Q1 is connected to one end of the thirty-fourth resistor R34 and one end of the thirty-fifth resistor R35, respectively, the other end of the thirty-fourth resistor R34 is connected to the IO port of the master MCU, and the emitter of the first NPN transistor Q1 is connected to the digital ground and the other end of the thirty-fifth resistor R35, respectively; the 17 pin of the NB-IoT module U5 is connected to one end of the thirty-sixth resistor R36, and the other end of the thirty-sixth resistor R36 is connected to the IO port of the master MCU; the 18 pin of the NB-IoT module U5 is connected to one end of the thirty-seventh resistor R37, and the other end of the thirty-seventh resistor R37 is connected to the IO port of the master MCU; the 24 pin of the NB-IoT module U5 is connected to one end of the thirty-eighth resistor R38, and the other end of the thirty-eighth resistor R38 is connected to one end of the fortieth resistor R40 and the base of the second NPN transistor Q2, respectively, the emitter of the second NPN transistor Q2 is connected to the digital ground and the other end of the fortieth resistor R40, respectively, and the collector of the second NPN transistor Q2 is connected to the negative electrode of the first light-emitting diode LED1, the positive electrode of the first light-emitting diode LED1 is connected to one end of the thirty-ninth resistor R39, and the other end of the thirty-ninth resistor R39 is connected to3V power supply; Pin 35 of the NB-IoT module U5 is connected to Pin 1 of the first RF coaxial connector RF1, and Pin 2 of the first RF coaxial connector RF1 is connected to digital ground; Pins 42 and 43 of the NB-IoT module U5 are connected to the NB-IoT module's 3.3V power supply, one end of the sixteenth capacitor C16, one end of the seventeenth capacitor C17, and one end of the eighteenth capacitor C18. The other ends of the sixteenth capacitor C16, the other ends of the seventeenth capacitor C17, and the other ends of the eighteenth capacitor C18 are connected to digital ground.

[0034] The base of the fourth NPN transistor Q4 is respectively connected to one end of the forty-first resistor R41 and one end of the forty-third resistor R43, the other end of the forty-first resistor R41 is connected to the IO port of the main control MCU, the emitter of the fourth NPN transistor Q4 is respectively connected to the digital ground and the other end of the forty-third resistor R43, the collector of the fourth NPN transistor Q4 is respectively connected to the gate of the third PMOS tube Q3 and one end of the forty-second resistor R42, the other end of the forty-second resistor R42 is respectively connected to the 3.3V power supply and the source of the third PMOS tube Q3, and the drain of the third PMOS tube Q3 is connected to the 3.3V power supply of the NB-IoT module.

[0035] like Figure 5 As shown, the RS-485 differential transceiver circuit includes an RS-485 transceiver U6, a forty-fifth resistor R45, a forty-sixth resistor R46, a forty-seventh resistor R47, a forty-ninth resistor R49, a thirty-second capacitor C32, a second light-emitting diode LED2, and a tenth terminal P10;

[0036] Pins 1, 2, 3, and 4 of the RS-485 transceiver U6 are connected to the IO port of the main control MCU, pin 5 of the RS-485 transceiver U6 is connected to the digital ground, pin 6 of the RS-485 transceiver U6 is respectively connected to one end of the forty-sixth resistor R46, one end of the forty-seventh resistor R47, and pin 2 of the tenth terminal P10, the other end of the forty-seventh resistor R47 is connected to a 3.3V power supply, and pin 7 of the RS-485 transceiver U6 is respectively connected to the other end of the forty-sixth resistor R46, the forty-fifth resistor R47, and pin 2 of the tenth terminal P10. One end of the resistor R45 is connected to pin 1 of the tenth terminal P10, the other end of the forty-fifth resistor R45 is respectively connected to the digital ground and one end of the thirty-second capacitor C32, and pin 8 of the RS-485 transceiver U6 is respectively connected to the 3.3V power supply and the other end of the thirty-second capacitor C32; one end of the forty-ninth resistor R49 is connected to the 3.3V power supply, the other end of the forty-ninth resistor R49 is connected to the positive electrode of the second light-emitting diode LED2, and the negative electrode of the second light-emitting diode LED2 is connected to the IO port of the main control MCU.

[0037] like Figure 6As shown, the analog voltage output circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a first capacitor C1, a second capacitor C2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a first zener diode D1, a second zener diode D2, a third zener diode D3, a fourth zener diode D4, a fifth zener diode D5, a sixth zener diode D6, a seventh zener diode D7, an eighth zener diode D8, a first transistor output optocoupler U1, a second transistor output optocoupler U2, a third power electronic switch U3, a first terminal P1, a second terminal P2, a third terminal P3, a fourth terminal P4, a fifth terminal P5, a sixth terminal P6, a seventh terminal P7, an eighth terminal P8;

[0038] Wherein the 1 pin of the first transistor output optocoupler U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the IO port of the host MCU; the 2, 4, 6, 8 pins of the first transistor output optocoupler U1 are connected to digital ground; the 3 pin of the first transistor output optocoupler U1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the IO port of the host MCU; the 5 pin of the first transistor output optocoupler U1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the IO port of the host MCU; the 7 pin of the first transistor output optocoupler U1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the IO port of the host MCU; the 10, 12, 14, 16 pins of the first transistor output optocoupler U1 are connected to the 5V power supply; the 9 pin of the first transistor output optocoupler U1 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the 9 pin of the third power electronic switch U3; the 11 pin of the first transistor output optocoupler U1 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the 8 pin of the third power electronic switch U3; the 13 pin of the first transistor output optocoupler U1 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the 7 pin of the third power electronic switch U3; the 15 pin of the first transistor output optocoupler U1 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the 6 pin of the third power electronic switch U3;

[0039] The 1 pin of the second transistor outputs the light coupling U2, one end of the fifth resistance R5 is connected, the other end of the fifth resistance R5 is connected with the IO port of the main control MCU; the 2, 4, 6, 8 pins of the second transistor outputs the light coupling U2 are connected with the digital ground; the 3 pin of the second transistor outputs the light coupling U2, one end of the sixth resistance R6 is connected, the other end of the sixth resistance R6 is connected with the IO port of the main control MCU; the 5 pin of the second transistor outputs the light coupling U2, one end of the seventh resistance R7 is connected, the other end of the seventh resistance R7 is connected with the IO port of the main control MCU; the 7 pin of the second transistor outputs the light coupling U2, one end of the eighth resistance R8 is connected, the other end of the eighth resistance R8 is connected with the IO port of the main control MCU; the 10, 12, 14, 16 pins of the second transistor outputs the light coupling U2 are connected with the 5V power supply; the 9 pin of the second transistor outputs the light coupling U2, one end of the sixteenth resistance R16 is connected, the other end of the sixteenth resistance R16 is connected with the 13 pin of the third power electronic switch U3; the 11 pin of the second transistor outputs the light coupling U2, one end of the fifteenth resistance R15 is connected, the other end of the fifteenth resistance R15 is connected with the 12 pin of the third power electronic switch U3; the 13 pin of the second transistor outputs the light coupling U2, one end of the fourteenth resistance R14 is connected, the other end of the fourteenth resistance R14 is connected with the 11 pin of the third power electronic switch U3; the 15 pin of the second transistor outputs the light coupling U2, one end of the thirteenth resistance R13 is connected, the other end of the thirteenth resistance R13 is connected with the 10 pin of the third power electronic switch U3;

[0040] The 1, 37 feet of the third power electronic switch U3 are connected with one end of the first capacitor C1, the positive pole of the second capacitor C2 and the analog end input voltage, the other end of the first capacitor C1 is connected with the analog ground, the other end of the second capacitor C2 is connected with the analog ground; the 19 feet of the power electronic switch U3 are connected with one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected with the analog ground; one end of the twenty-second resistor R22, one end of the twenty-third resistor R23, one end of the twenty-fourth resistor R24, one end of the twenty-fifth resistor R25, one end of the twenty-sixth resistor R26, one end of the twenty-seventh resistor R27, one end of the twenty-eighth resistor R28 and one end of the twenty-ninth resistor R29 are connected with the analog ground, one end of the fourth capacitor C4, one end of the fifth capacitor C5, one end of the sixth capacitor C6, one end of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the ninth capacitor C9, one end of the tenth capacitor C10 and one end of the eleventh capacitor C11 are connected with the analog ground, the positive poles of the first, second, third, fourth, fifth, sixth, seventh and eighth voltage stabilizing diodes D1, D2, D3, D4, D5, D6, D7 and D8 are connected with the analog ground, the 1 feet of the first, second, third, fourth, fifth, sixth, seventh and eighth terminals P1, P2, P3, P4, P5, P6, P7 and P8 are connected with the analog ground; the 21, 22 feet of the third power electronic switch U3 are connected with the other end of the twenty-ninth resistor R29, the other end of the eleventh capacitor C11, the negative pole of the eighth voltage stabilizing diode D8 and the 2 feet of the eighth terminal P8; the 23, 24 feet of the third power electronic switch U3 are connected with the other end of the twenty-eighth resistor R28, the other end of the tenth capacitor C10, the negative pole of the seventh voltage stabilizing diode D7 and the 2 feet of the seventh terminal P7; the 25, 26 feet of the third power electronic switch U3 are connected with the other end of the twenty-seventh resistor R27, the other end of the ninth capacitor C9, the negative pole of the sixth voltage stabilizing diode D6 and the 2 feet of the sixth terminal P6; the 27, 28 feet of the third power electronic switch U3 are connected with the other end of the twenty-sixth resistor R26, the other end of the eighth capacitor C8, the negative pole of the fifth voltage stabilizing diode D5 and the 2 feet of the fifth terminal P5; the 29, 30 feet of the third power electronic switch U3 are connected with the other end of the twenty-fifth resistor R25, the other end of the seventh capacitor C7, the negative pole of the fourth voltage stabilizing diode D4 and the 2 feet of the fourth terminal P4; the 31, 32 feet of the third power electronic switch U3 are connected with the other end of the twenty-fourth resistor R24, the other end of the sixth capacitor C6, the negative pole of the third voltage stabilizing diode D3 and the 2 feet of the third terminal P3; the 33, 34 feet of the third power electronic switch U3 are connected with the other end of the twenty-third resistor R23, the other end of the fifth capacitor C5, the negative pole of the second voltage stabilizing diode D2 and the 2 feet of the second terminal P2.The 35th and 36th pins of the third power electronic switch U3 are connected to the other end of the 22nd resistor R22, the other end of the fourth capacitor C4, the negative electrode of the first voltage stabilizing diode D1 and the 2nd pin of the first terminal P1.

[0041] In the 8-channel 0-10V voltage output remote control circuit, the level conversion circuit is used to convert the provided power supply into the level required by each part of the circuit, so that each circuit works normally, and the level is transmitted to the analog voltage output circuit and the main control MCU; then the main control MCU obtains the voltage signal output instruction through the NB-IoT module circuit and the RS-485 differential transceiver circuit communication, and analyzes the output voltage signal in the 8 channels from the instruction, and the main control MCU sends the PWM wave, and through the isolation circuit part of the analog voltage output circuit, a switching signal capable of controlling the output voltage amplitude of the module is generated and the voltage signal output is started; the main control MCU calculates the amplitude of the output voltage signal according to the output PWM wave and the input voltage, and sends the signal data to the cloud platform through the NB-IoT module circuit for unified control and management, or sends the signal data to the external device through the RS-485 communication for control and management. If an abnormal condition occurs during the voltage signal output process, the main control MCU will report the abnormal condition to the cloud platform through the NB-IoT module circuit, and display the fault prompt in the cloud platform system, and at the same time, the abnormality will be sent to the external device and the flashing LED lamp through the RS-485 differential transceiver circuit communication for prompt.

[0042] In the 8-channel 0-10V voltage output remote control circuit, the eighth DC-DC power supply chip U8 in the level conversion circuit generates 5V power supply VCC_5V through the tenth anti-reverse connection switch diode D10 to reduce the external input 12V power supply, and is connected to the VCC_5V of the analog voltage output circuit and the 3rd pin of the seventh DC-DC power supply chip U7. The 2nd and 4th pins of the seventh DC-DC power supply chip U7 generate 3.3V power supply VCC_3.3V and are connected to the VCC_3.3V of each circuit. The external input 12V power supply generates an analog terminal input voltage AVCC after passing through the 30th capacitor C30 and the 31st capacitor C31 and is connected to the AVCC of the analog voltage output circuit. The 20th capacitor C20, the 21st capacitor C21, the 22nd capacitor C22, the 25th capacitor C25, the 30th capacitor C30 play a voltage stabilizing role, and the 23rd capacitor C23, the 24th capacitor C24, the 26th capacitor C26, the 27th capacitor C27, the 28th capacitor C28 and the 29th capacitor C29 play a role of filtering and suppressing high-frequency noise.

[0043] In the 8-channel 0-10V voltage output remote control circuit in this embodiment, the IO port of the host MCU is connected through the forty-first resistor R41 in the NB-IoT module circuit, the host MCU outputs a high level through the IO port through the forty-first resistor R41 to make the fourth NPN transistor Q4 conductive and pull the third PMOS tube Q3 to low level, the third PMOS tube Q3 is conductive, and the 3.3V power supply is used to power the NB-IoT module circuit. The 15th pin of the NB-IoT module U5 is connected to the collector of the first NPN transistor Q1, when the host MCU is reset, a high level is output through the IO port through the thirty-fourth resistor R34 to make the first NPN transistor Q1 conductive, the 15th pin of the NB-IoT module U5 is pulled to low level, and the NB-IoT module is reset. The 17th pin and the 18th pin of the NB-IoT module U5 are connected to a serial port of the host MCU through the thirty-sixth resistor R36 and the thirty-seventh resistor R37 respectively, so that the instructions issued by the cloud platform are transmitted from the NB-IoT module circuit to the host MCU for analysis, wherein the cloud platform and the NB-IoT module circuit use MQTT protocol for communication.

[0044] In the 8-channel 0-10V voltage output remote control circuit in the embodiment, the 1st and 4th pins of the RS-485 transceiver U6 in the RS-485 differential transceiver circuit are connected to a serial port of the host MCU, the terminal P10 is connected with the RS-485 interface of the external device by using a twisted pair, and the instruction of the external device is transmitted to the host MCU for analysis through RS-485 communication. After the host MCU analyzes the instruction issued by the cloud platform or the external device, the channel number of the voltage signal to be output and the amplitude of the voltage signal to be output by each channel are determined, and then the host MCU connects the IO port of the 1st, 3rd, 5th and 7th pins of the first transistor output optocoupler U1 and the 1st, 3rd, 5th and 7th pins of the second transistor output optocoupler U2, outputs the PWM wave of 1kHZ through the resistors R1, R2, R3, R4, R5, R6, R7 and R8, and adjusts the duty cycle of the MCU output PWM wave to control the switching frequency of the 9th and 10th pins, the 11th and 12th pins, the 13th and 14th pins and the 15th and 16th pins of the transistor output optocouplers U1 and U2, wherein the 10th, 12th, 14th and 16th pins of the first transistor output optocoupler U1 and the second transistor output optocoupler U2 are connected to the 5V power supply, the 9th, 11th, 13th and 15th pins of the first transistor output optocoupler U1 and the second transistor output optocoupler U2 are connected to the 6th, 7th, 8th, 9th, 10th, 11th, 12th and 13th pins of the third power electronic switch U3 through the resistors R9, R10, R11, R12, R13, R14, R15 and R16, and the analog end input voltage is connected to the 1st pin of the third power electronic switch U3 for power supply, and also supplies power to the 21st and 22nd pins, the 23rd and 24th pins, the 25th and 26th pins, the 27th and 28th pins, the 29th and 30th pins, the 31st and 32nd pins, the 33rd and 34th pins and the 35th and 36th pins of the 8 output channels of the third power electronic switch U3 respectively, and the output channel voltage amplitude can be calculated by the analog end input voltage and the third power electronic switch U3 input end switching frequency, and the formula is as follows:

[0045] Vout=12*x%

[0046] In the formula, x% is the duty cycle of the MCU output PWM wave.

[0047] The voltage signal obtained through the control has high precision and is convenient to control; the main control MCU reports the on-off state of the 8 channels and the signal amplitude of the output voltage of each channel to the cloud platform for unified management through the NB-IoT module circuit. If the third power electronic switch U3 has an output fault, the 20th pin of the third power electronic switch U3 is pulled to high level, one end of the current limiting resistor R18 in the output abnormality detection circuit is pulled to high level, the voltage drop between the two ends of the voltage dividing resistor R19 connects the 3rd pin and the 4th pin of the fourth transistor output optocoupler U4, the main control MCU detects that the 3rd pin of the fourth transistor output optocoupler U4 is pulled up to high level, then the main control MCU detects that the abnormality occurs and triggers the abnormality detection mechanism, the main control MCU controls the NB-IoT module circuit and the RS-485 differential transceiver circuit to report the abnormality to the cloud platform and external equipment (such as PLC or industrial gateway) respectively, and at the same time, the negative electrode of the second light emitting diode LED2 is intermittently pulled to low level by the IO port of the main control MCU to make the second light emitting diode LED2 flash to prompt the abnormality, so that the abnormality can be found and handled in time to improve the maintenance efficiency.

Claims

1. An 8-channel 0-10V voltage output remote control circuit, characterized in that: It includes a main control MCU, an analog voltage output circuit, an output abnormality detection circuit, a level conversion circuit, an NB-IoT module circuit and an RS-485 differential transceiver circuit, wherein the output end of the level conversion circuit is respectively connected to the input end of the analog voltage output circuit and the input end of the main control MCU, the output end of the analog voltage output circuit is connected to the input end of the output abnormality detection circuit, the output end of the output abnormality detection circuit is connected to the input end of the main control MCU, the output end of the main control MCU is connected to the input end of the analog voltage output circuit, the main control MCU is connected to the NB-IoT module circuit and the RS-485 differential transceiver circuit, the NB-IoT module circuit is connected to the cloud platform in a wireless manner, and the RS-485 differential transceiver circuit is connected to external devices; If an abnormality occurs during the voltage signal output process, the main control MCU reports the abnormality to the cloud platform through the NB-IoT module circuit, and a fault prompt is displayed on the cloud platform. At the same time, the abnormality is sent to the external device through the RS-485 differential transceiver circuit for fault prompt; The output abnormality detection circuit includes an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a third capacitor and a fourth transistor output optical coupler; One end of the eighteenth resistor is connected to pin 20 of the power electronic switch in the analog voltage output circuit, the other end of the eighteenth resistor is respectively connected to one end of the nineteenth resistor, one end of the third capacitor, and pin 1 of the fourth transistor output optocoupler, the other end of the nineteenth resistor is respectively connected to one end of the twentieth resistor, the other end of the third capacitor, and pin 2 of the fourth transistor output optocoupler, the other end of the twentieth resistor is connected to the analog ground, pin 4 of the fourth transistor output optocoupler is connected to the 3.3V power supply, pin 3 of the fourth transistor output optocoupler is respectively connected to the IO port of the main control MCU and one end of the twenty-first resistor, and the other end of the twenty-first resistor is connected to the digital ground; The RS-485 differential transceiver circuit includes an RS-485 transceiver, a forty-fifth resistor, a forty-sixth resistor, a forty-seventh resistor, a forty-ninth resistor, a thirty-second capacitor, a second light-emitting diode, and a tenth terminal; Among them, pins 1, 2, 3, and 4 of the RS-485 transceiver are connected to the IO port of the main control MCU, pin 5 of the RS-485 transceiver is connected to the digital ground, pin 6 of the RS-485 transceiver is respectively connected to one end of the 46th resistor, one end of the 47th resistor and pin 2 of the tenth terminal, and the other end of the 47th resistor is connected to the 3.3V power supply, pin 7 of the RS-485 transceiver is respectively connected to the other end of the 46th resistor, one end of the 45th resistor and pin 1 of the tenth terminal, and the other end of the 45th resistor is respectively connected to the digital ground and one end of the 32nd capacitor, and pin 8 of the RS-485 transceiver is respectively connected to the 3.3V power supply and the other end of the 47th capacitor; one end of the 49th resistor is connected to the 3.3V power supply, the other end of the 49th resistor is connected to the positive electrode of the second light-emitting diode, and the negative electrode of the second light-emitting diode is connected to the IO port of the main control MCU.

2. The 8-channel 0-10V voltage output remote control circuit according to claim 1, characterized in that: The NB-IoT module circuit includes an NB-IoT module, a four-way ESD protection array, a SIM card connector, a first NPN transistor, a second NPN transistor, a fourth NPN transistor, a third PMOS transistor, a first RF coaxial connector, a first light-emitting diode, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor, and a forty-fourth resistor. Pins 1, 27, 34, 36, 37, 40, and 41 of the NB-IoT module are connected to digital ground. Pin 7 of the NB-IoT module is connected to one end of the 44th resistor, and the other end of the 44th resistor is connected to digital ground. Pin 10 of the NB-IoT module is connected to one end of the 19th capacitor and pin C5 of the SIM card connector. Pin 11 of the NB-IoT module is connected to one end of the 33rd resistor and one end of the 31st resistor, and the other end of the 31st resistor is connected to one end of the 14th capacitor, pin 4 of the four-way ESD protection array, and pin C7 of the SIM card connector. Pin 12 of the NB-IoT module is connected to one end of the 32nd resistor. The other end of the 32nd resistor is connected to one end of the 13th capacitor, pin 3 of the four-way ESD protection array, and pin C2 of the SIM card connector. Pin 13 of the NB-IoT module is connected to one end of the 30th resistor. The other end of the 30th resistor is connected to one end of the 15th capacitor, pin 5 of the four-way ESD protection array, and pin C3 of the SIM card connector. Pin 14 of the NB-IoT module is respectively connected to the other end of the 33rd resistor and the other end of the 19th capacitor, one end of the 12th capacitor, pin 1 of the four-way ESD protection array and pin C1 of the SIM card connector. The other end of the 12th capacitor, the other end of the 13th capacitor, the other end of the 14th capacitor and the other end of the 15th capacitor are connected to the digital ground, and pin 0 of the SIM card connector is connected to the digital ground; pin 15 of the NB-IoT module is connected to the collector of the first NPN transistor, the base of the first NPN transistor is respectively connected to one end of the 34th resistor and one end of the 35th resistor, the other end of the 34th resistor is connected to the IO port of the main control MCU, and the emitter of the first NPN transistor is respectively connected to the digital ground and the other end of the 35th resistor; pin 17 of the NB-IoT module is connected to one end of the 36th resistor, and the other end of the 36th resistor is connected to the IO port of the main control MCU; pin 18 of the NB-IoT module is connected to one end of the 37th resistor, the base of the 37th resistor and the base of the 37th resistor are respectively connected to one end of the 37th resistor. The other end of the seven resistors is connected to the IO port of the main control MCU; pin 24 of the NB-IoT module is connected to one end of the 38th resistor, the other end of the 38th resistor is respectively connected to one end of the 40th resistor and the base of the second NPN transistor, the emitter of the second NPN transistor is respectively connected to the digital ground and the other end of the 40th resistor, the collector of the second NPN transistor is connected to the cathode of the first light-emitting diode, the anode of the first light-emitting diode is connected to one end of the 39th resistor, and the other end of the 39th resistor is connected to the 3.3V power supply; pin 35 of the NB-IoT module is connected to pin 1 of the first RF coaxial connector, and pin 2 of the first RF coaxial connector is connected to the digital ground; pins 42 and 43 of the NB-IoT module are connected to the 3.3V power supply of the NB-IoT module, one end of the 16th capacitor, one end of the 17th capacitor, and one end of the 18th capacitor, and the other end of the 16th capacitor, the other end of the 17th capacitor, and the other end of the 18th capacitor are connected to the digital ground; The base of the fourth NPN transistor is respectively connected to one end of the forty-first resistor and one end of the forty-third resistor, the other end of the forty-first resistor is connected to the IO port of the main control MCU, the emitter of the fourth NPN transistor is respectively connected to the digital ground and the other end of the forty-third resistor, the collector of the fourth NPN transistor is respectively connected to the gate of the third PMOS tube and one end of the forty-second resistor, the other end of the forty-second resistor is respectively connected to the 3.3V power supply and the source of the third PMOS tube, and the drain of the third PMOS tube is connected to the 3.3V power supply of the NB-IoT module.

3. The 8-channel 0-10V voltage output remote control circuit according to claim 1, characterized in that: The analog voltage output circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, and a twenty-ninth resistor; a first capacitor, a second capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, and an eleventh capacitor; a first Zener diode, a second Zener diode, a third Zener diode, a fourth Zener diode, a fifth Zener diode, a sixth Zener diode, a seventh Zener diode, and an eighth Zener diode; a first transistor output optocoupler, a second transistor output optocoupler, a third power electronic switch, a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a fifth wiring terminal, a sixth wiring terminal, a seventh wiring terminal, and an eighth wiring terminal; Pin 1 of the first transistor output optocoupler is connected to one end of the first resistor, and the other end of the first resistor is connected to the IO port of the main control MCU; pins 2, 4, 6, and 8 of the first transistor output optocoupler are connected to the digital ground; pin 3 of the first transistor output optocoupler is connected to one end of the second resistor, and the other end of the second resistor is connected to the IO port of the main control MCU; Pin 5 of the first transistor output optocoupler is connected to one end of the third resistor, and the other end of the third resistor is connected to the IO port of the main control MCU; Pin 7 of the first transistor output optocoupler is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the IO port of the main control MCU; pins 10, 12, 14, and 16 of the first transistor output optocoupler are connected to a 5V power supply; pin 9 of the first transistor output optocoupler is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to pin 9 of the third power electronic switch; pin 11 of the first transistor output optocoupler is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to pin 8 of the third power electronic switch; pin 13 of the first transistor output optocoupler is connected to one end of the tenth resistor, and the other end of the tenth resistor is connected to pin 7 of the third power electronic switch; pin 15 of the first transistor output optocoupler is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to pin 6 of the third power electronic switch; Pin 1 of the second transistor output optocoupler is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the IO port of the main control MCU; Pins 2, 4, 6, and 8 of the second transistor output optocoupler are connected to the digital ground; pin 3 of the second transistor output optocoupler is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the IO port of the main control MCU; Pin 5 of the second transistor output optocoupler is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the IO port of the main control MCU; Pin 7 of the second transistor output optocoupler is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to the IO port of the main control MCU; pins 10, 12, 14, and 16 of the second transistor output optocoupler are connected to a 5V power supply; pin 9 of the second transistor output optocoupler is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is connected to pin 13 of the third power electronic switch; pin 11 of the second transistor output optocoupler is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to pin 12 of the third power electronic switch; Pin 13 of the second transistor output optocoupler is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to pin 11 of the third power electronic switch; pin 15 of the second transistor output optocoupler is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to pin 10 of the third power electronic switch; Pins 1 and 37 of the third power electronic switch are connected to one end of the first capacitor, the positive electrode of the second capacitor, and the analog input voltage, the other end of the first capacitor is connected to the analog ground, and the other end of the second capacitor is connected to the analog ground; pin 19 of the power electronic switch is connected to one end of the seventeenth resistor, and the other end of the seventeenth resistor is connected to the analog ground; One end of the twenty-second resistor, one end of the twenty-third resistor, one end of the twenty-fourth resistor, one end of the twenty-fifth resistor, one end of the twenty-sixth resistor, one end of the twenty-seventh resistor, one end of the twenty-eighth resistor, and one end of the twenty-ninth resistor are connected to the analog ground, one end of the fourth capacitor, one end of the fifth capacitor, one end of the sixth capacitor, one end of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, and one end of the eleventh capacitor are connected to the analog ground, the anode of the first Zener diode, the anode of the second Zener diode, the anode of the third Zener diode, and the fourth Zener diode The positive electrode of the fifth Zener diode, the positive electrode of the sixth Zener diode, the positive electrode of the seventh Zener diode and the positive electrode of the eighth Zener diode are connected to the analog ground, and the first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal, the sixth terminal, the seventh terminal and the pin 1 of the eighth terminal are connected to the analog ground; the 21st and 22nd pins of the third power electronic switch are connected to the other end of the 29th resistor, the other end of the 11th capacitor, the cathode of the eighth Zener diode and the 2nd pin of the eighth terminal; the 23rd and 24th pins of the third power electronic switch are connected to the second The other end of the eighteenth resistor, the other end of the tenth capacitor, the cathode of the seventh Zener diode and pin 2 of the seventh terminal; pins 25 and 26 of the third power electronic switch are connected to the other end of the twenty-seventh resistor, the other end of the ninth capacitor, the cathode of the sixth Zener diode and pin 2 of the sixth terminal; pins 27 and 28 of the third power electronic switch are connected to the other end of the twenty-sixth resistor, the other end of the eighth capacitor, the cathode of the fifth Zener diode and pin 2 of the fifth terminal; pins 29 and 30 of the third power electronic switch are connected to the other end of the twenty-fifth resistor, the other end of the seventh capacitor, The cathode of the fourth Zener diode and pin 2 of the fourth terminal; pins 31 and 32 of the third power electronic switch are connected to the other end of the twenty-fourth resistor, the other end of the sixth capacitor, the cathode of the third Zener diode and pin 2 of the third terminal; pins 33 and 34 of the third power electronic switch are connected to the other end of the twenty-third resistor, the other end of the fifth capacitor, the cathode of the second Zener diode and pin 2 of the second terminal; pins 35 and 36 of the third power electronic switch are connected to the other end of the twenty-second resistor, the other end of the fourth capacitor, the cathode of the first Zener diode and pin 2 of the first terminal.

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