A split range control logic based on-site control system

Abstract

The application discloses an on-site control system based on a split-range control logic, which comprises a central processing unit and a signal acquisition unit, a temperature acquisition unit, a communication output unit, an alarm output unit, an LED display unit and a power unit, all of which are connected with the central processing unit; the signal acquisition unit differentially samples input current signals and transmits the signals to the central processing unit; the temperature acquisition unit differentially samples signals collected by a temperature sensor and transmits the signals to the central processing unit; the central processing unit receives digital signals transmitted by the signal acquisition unit and the temperature acquisition unit, processes the signals to obtain corresponding current values and temperature values, and then transmits the current values or / and the temperature values to the alarm output unit and the LED display unit; the communication transmission unit receives data from the central processing unit and remotely transmits the data. The control system utilizes an ADC differential technology, differentially samples field sensor output and uses the output for on-site control, and can adapt to various actuators which need to be directly controlled on site in actual production processes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of measurement and automatic control, and relates to an automatic control technology of split-range control, in particular to a just-in-place control system based on split-range control logic. BACKGROUND

[0002] A controller is a master device that controls the start, speed, braking and reverse of a motor by changing the wiring of a main circuit or a control circuit and changing the resistance value in the circuit according to a predetermined sequence. It is composed of a program counter, an instruction register, an instruction decoder, a timing generator and an operation controller, and is a "decision mechanism" that issues commands, i.e., coordinates and commands the operation of the entire computer system.

[0003] Controllers can be classified into many types, such as combinational logic controllers, microprogram controllers and programmable controllers.

[0004] A combinational logic controller is a control operation realized by using combinational logic technology, in which a control component is regarded as a logic circuit that generates a special fixed timing control signal. This logic circuit is a complex logic network composed of gate circuits and flip-flops. The line structure of a control unit designed by using a combinational logic design method is very complex and irregular. Moreover, the more complete the function of an instruction system is and the more micro-operation commands there are, the more complex the line is. Once the control component is constituted, it is impossible to add new control functions unless it is redesigned and rewired physically.

[0005] A microprogram controller is proposed to overcome the defects of a combinational logic controller, such as complex line and difficulty in modification. It uses a method similar to a stored program to form a micro-operation command sequence. That is, a machine instruction is regarded as a microprogram, and each microprogram contains several micro-instructions, each of which corresponds to one or several micro-operations. Then, these microprograms are stored in a memory, and the micro-instructions in each microprogram are found by searching for a user program machine instruction, and each micro-instruction is executed one by one, so that the entire operation of a machine instruction is completed. Compared with a combinational logic controller, a microprogram controller has the advantages of regular design, debugging, maintenance, modification and expansion of instructions, and is easy to realize automatic design. However, since it uses a control memory, the execution speed of an instruction is slower than that of a combinational logic controller.

[0006] Programmable Logic Controller (PLC) is a kind of logic controller to replace the traditional complex relay group, which uses programmable memory to execute stored logic operation and sequence control, timing, counting and arithmetic operation instructions, and controls various types of mechanical equipment or production process through digital or analog input (I) and output (O) interface. Compared with relay, the reaction speed of PLC, its communication, reliability, redundancy, safety, editable characteristics, stability and other characteristics are lacking in traditional relay. PLC has been widely used in the automatic control of various production machinery and production processes, and has become one of the most important, most popular and most widely used industrial control devices, and is recognized as one of the three pillars of modern industrial automation (PLC, robot, CAD / CAM). However, programmable controller has the disadvantages of high price and high energy consumption.

[0007] In summary, it is of great significance to design a control system with simple wiring and debugging, low cost and low power consumption for the field of industrial control. SUMMARY

[0008] The purpose of the present application is to solve the above problems, and provide a just-in-place control system based on split-range control logic, which uses ADC differential technology to differentially output field sensor and use it for just-in-place control, and can adapt to various actuators that need to be directly controlled in actual production process.

[0009] To achieve the above purpose, the just-in-place control system based on split-range control logic provided by the present application comprises a central processing unit and a signal acquisition unit, a temperature acquisition unit, a communication output unit, an alarm output unit, an LED display unit and a power supply unit connected with the central processing unit.

[0010] The signal acquisition unit differentially samples the input current signal and transmits the sampled signal to the central processing unit; the temperature acquisition unit differentially samples the signal collected by the temperature sensor and transmits the sampled signal to the central processing unit; the central processing unit receives the signals transmitted from the signal acquisition unit and the temperature acquisition unit for processing to obtain corresponding current value and temperature value, and then transmits the current value or / and temperature value to the alarm output unit and the LED display unit; the communication transmission unit receives the data processed by the central processing unit and transmits the data remotely; and the power supply unit provides power supply for the central processing unit, the communication output unit and the alarm output unit.

[0011] In the above-mentioned on-site control system based on split-range control logic, the signal acquisition unit is mainly used to sample the current signals input by various instruments and convert the current signals into digital signals. The signal acquisition unit includes a signal acquisition terminal, a second transient voltage suppressor diode, a 19th resistor, a 20th resistor, a 21st resistor, a 22nd resistor, a 23rd resistor, and a 24th resistor. The signal acquisition terminal includes a positive signal terminal and a negative signal terminal. The positive electrode of the input current signal passes through the positive signal terminal, is limited by the second transient voltage suppressor diode, and is input to the ADC acquisition channel 0 of the central processing unit through the 19th resistor; the other path is sampled by the parallel 20th and 21st resistors and then divided into four sub-paths. The first sub-path flows out through the negative signal terminal, the second sub-path is grounded through the 24th resistor, the third sub-path is connected to the constant current source pin of the central processing unit through the 22nd resistor, and the fourth sub-path is connected to the ADC acquisition channel 1 of the central processing unit through the 23rd resistor. ADC acquisition channel 0 and acquisition channel 1 form a differential sampling to obtain an AD sampling signal of the current signal.

[0012] In the above-mentioned local control system based on split-range control logic, the temperature acquisition unit includes a temperature sensor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, and a twenty-eighth resistor. The central processing unit outputs a constant current power supply to the temperature acquisition unit, which is divided into two paths through the twenty-fifth resistor. One path is connected to the ADC acquisition channel 2 of the central processing unit through the twenty-sixth resistor; the other path is further divided into two sub-paths after passing through the temperature sensor. The first sub-path is connected to ground through the twenty-eighth resistor, and the second sub-path is connected to the ADC acquisition channel 3 of the central processing unit through the twenty-seventh resistor. ADC acquisition channels 2 and 3 perform differential sampling to obtain the AD sampling signal of the temperature sensor. In the present invention, the temperature sensor is a Pt resistance temperature sensor.

[0013] The in-situ control system based on the split-range control logic, the central processing unit calculates the current value through the digital signal transmitted by the signal acquisition unit, and then performs conditional judgment on the current value and the set alarm value, and transmits the alarm switch signal to the alarm output unit and the LED display unit; and calculates the temperature value through the digital signal transmitted by the temperature acquisition unit and transmits the real-time temperature through the RS485. The central processing unit includes a fourth chip and its peripheral circuit, the fourth chip includes AIN0 pin, AIN1 pin, AIN2 pin and AIN3 pin connected with ADC acquisition channel 0, acquisition channel 1, acquisition channel 2 and acquisition channel 3; the fourth chip obtains the corresponding current value according to the AD sampling signal sampled from the acquisition channel 0 and the acquisition channel 1, and then gives the corresponding lower end switch signal according to the current set value; the fourth chip obtains the corresponding temperature value according to the AD sampling signal sampled from the acquisition channel 2 and the acquisition channel 3, and then transmits it to the communication transmission unit, and the temperature can be viewed through the communication transmission unit. The fourth chip further includes P0.4 / RTS / ECI.KO pin, P0.2 / MOSI1 / SDA / SOUT pin and P0.1 / SCI.KI / SCI. / SIN pin as data remote transmission port with the communication transmission unit, P1.5 / IRQ5 / PWM3 / SCLK0 pin, P1.6 / IRQ6 / PWM4 / MOSI0 pin as data transmission port with the alarm output unit, and P0.7 / POR / SOUT pin, P0.6 / IRQ2 / SIN pin as data transmission port with the LED display unit.

[0014] The in-situ control system based on the split-range control logic, the communication transmission unit is mainly used for 485 signal transmission, and realizes data remote transmission. The communication transmission unit includes a fifth chip, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a thirty-third capacitor and a third transient voltage suppression diode; the pin A and the pin B of the fifth chip are respectively connected to the first communication port and the second communication port through the thirty-eighth resistor pull-up and the thirty-ninth resistor pull-down, and the pin A and the pin B are protected by the third transient voltage suppression diode; the RO pin of the fifth chip is connected with the P0.4 / RTS / ECI.KO pin of the fourth chip through the thirty-fifth resistor, the pin and the DE pin of the fifth chip are connected with the P0.2 / MOSI1 / SDA / SOUT pin of the fourth chip through the thirty-sixth resistor, and the DI pin of the fifth chip is connected with the P0.1 / SCI.KI / SCI. / SIN pin of the fourth chip through the thirty-seventh resistor, and the VCC pin and the GAD pin of the fifth chip are respectively connected with the ground port as the power port.

[0015] The in-situ control system based on the above-mentioned split control logic, the alarm output unit makes corresponding alarm output through the current value calculated by the central processing unit. The alarm output unit includes a first alarm subunit and a second alarm subunit which are structurally identical, the first alarm subunit is connected with the P1.6 / IRQ6 / PWM4 / MOSI0 pin of the fourth chip, and the second alarm subunit is connected with the P1.5 / IRQ5 / PWM3 / SCLK0 pin of the fourth chip.

[0016] The first alarm subunit includes a first relay, a first switch, a second switch, a seventh diode, an eighth diode, a first triode, a twenty-ninth resistor and a thirtieth resistor. The 4th and 5th pins of the first relay are connected with the first power supply output through the first switch, the 2nd and 7th pins of the first relay are connected with the first power supply output through the second switch, the 3rd and 6th pins of the first relay are connected in parallel to the output, the 1st pin of the first relay is connected with the fourth power supply output, and the connecting line between the 1st pin of the first relay and the fourth power supply output is connected with the collector of the first triode in turn through the seventh diode, the eighth diode and the first triode, the 8th pin of the first relay is connected with the collector of the first triode, the connecting line between the seventh diode and the eighth diode is connected with the connecting line between the 8th pin of the first relay and the collector of the first triode, the P1.6 / IRQ6 / PWM4 / MOSI0 pin of the fourth chip is connected with the base of the first triode through the twenty-ninth resistor, and the connecting line between the first triode and the twenty-ninth resistor is grounded through the thirtieth resistor.

[0017] The second alarm subunit includes a second relay, a third switch, a fourth switch, a ninth diode, a twelfth diode, a second triode, a thirty-first resistor and a thirty-second resistor. The 4th and 5th pins of the second relay are connected with the first power supply output through the third switch, the 2nd and 7th pins of the second relay are connected with the first power supply output through the fourth switch, the 3rd and 6th pins of the second relay are connected in parallel to the output, the 1st pin of the second relay is connected with the sixth power supply output, the connecting line between the 1st pin of the second relay and the fourth power supply output is connected with the collector of the second triode in turn through the ninth diode and the twelfth diode, the 8th pin of the second relay is connected with the collector of the second triode, the connecting line between the ninth diode and the twelfth diode is connected with the connecting line between the 8th pin of the second relay and the collector of the second triode, the P1.5 / IRQ5 / PWM3 / SCLK0 pin of the fourth chip is connected with the base of the second triode through the thirty-first resistor, and the connecting line between the second triode and the thirty-first resistor is grounded through the thirty-second resistor.

[0018] The LED display unit displays different colors (such as red, orange, green) through the current value calculated by the central processing unit. The LED display unit comprises a light-emitting diode, an eleventh diode, a thirty-third resistor and a thirty-fourth resistor, the P0.7 / POR / SOUT pin of the fourth chip is connected with the anode of the light-emitting diode through the thirty-third resistor, the P0.6 / IRQ2 / SIN pin of the fourth chip is connected with the anode of the eleventh diode through the thirty-fourth resistor, and the cathodes of the light-emitting diode and the eleventh diode are grounded.

[0019] The power supply unit mainly provides 3.3V direct current voltage for the central processing unit, 24V and 12V direct current voltage for the alarm output unit and 5V direct current voltage for the communication output unit. The power supply unit comprises a power supply, a first chip, a second chip, a third chip and peripheral circuits thereof. The power supply unit comprises a power supply, a first chip, a second chip, a third chip and peripheral circuits thereof; the positive electrode of the power supply is connected with a first power supply output end, the negative electrode is grounded, the first power supply output end is divided into two paths, one path is connected with a switch of the alarm output unit to supply power for the switch, and the other path is limited in voltage through a fuse, a first transient voltage suppression diode, then input to the VIN pin of the first chip through a first diode unidirectional conduction and a first capacitor filtering; the PH pin of the first chip is connected with a second power supply output end through a first inductor and three voltage dividing resistors of a second resistor, a third resistor and a fourth resistor in series connection; the second power supply output end is adjusted to VCC through a fifth resistor as a third power supply output end to supply power for the second chip; the third power supply output end is connected with the input winding of a three-winding transformer through a comparator and a field effect transistor group; the first output winding of the three-winding transformer is connected with a fourth power supply output end through a first diode group and a first capacitor group in parallel connection for rectification and voltage multiplication, and the fourth power supply output end is connected with the Vin pin of the second chip; the second output winding of the three-winding transformer is connected with a sixth power supply output end through a second diode group and a second capacitor group in parallel connection for rectification and voltage multiplication in sequence, and the sixth power supply output end is connected with the Vin pin of the third chip; the fourth power supply output end and the sixth power supply output end are also connected with a relay of the alarm output unit to supply power for the relay; the Vout pin of the second chip is connected with a fifth power supply output end to supply power for the central processing unit; and the Vout pin of the third chip is connected with a seventh power supply output end to supply power for the communication transmission unit.

[0020] The on-site control system based on the split-range control logic has the following beneficial effects:

[0021] (1) The on-site control system based on split-range control logic provided by the application uses ADC differential technology to separate the control system from various instruments, and has the advantages of low cost, convenient installation, simple maintenance and troubleshooting, and low maintenance cost, compared with controllers and PLCs that are integrated with various instruments.

[0022] (2) The on-site control system provided by the application has two output channels according to the split-range control logic, and can control two different actuators according to different signal terminals, and can be conveniently installed on various instruments for user-defined settings according to actual conditions, and can be used to directly control actuators in actual production processes, and can directly feedback and control signals on site.

[0023] (3) The on-site control system provided by the application can further reduce the design size by combining various chips and circuit boards to achieve the purpose of small size and easy installation.

[0024] (4) Overall, the on-site control system provided by the application has simple wiring and debugging, low cost, and low power consumption, and is suitable for on-site control in various installation conditions. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a power supply unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0026] Figure 2 is a signal acquisition unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0027] Figure 3 is a temperature acquisition unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0028] Figure 4 is a central processing unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0029] Figure 5 is an alarm output unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0030] Figure 6 is an LED display unit schematic diagram of the on-site control system based on split-range control logic of the application;

[0031] Figure 7 is a communication transmission unit schematic diagram of the on-site control system based on split-range control logic of the application. DETAILED DESCRIPTION

[0032] The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work belong to the present application.

[0033] The in-situ control system based on the split-range control logic in the embodiment comprises a central processing unit and a signal acquisition unit, a temperature acquisition unit, a communication output unit, an alarm output unit, an LED display unit and a power supply unit, which are all connected with the central processing unit. Figures 1-7 The signal acquisition unit differentially samples the input current signal and transmits the sampled signal to the central processing unit; the temperature acquisition unit differentially samples the signal collected by the temperature sensor and transmits the sampled signal to the central processing unit; the central processing unit receives the signals transmitted from the signal acquisition unit and the temperature acquisition unit, processes the signals to obtain corresponding current value and temperature value, and then transmits the current value or / and the temperature value to the alarm output unit and the LED display unit; the communication transmission unit receives the data processed by the central processing unit and transmits the data remotely; and the power supply unit provides power supply for the central processing unit, the communication output unit and the alarm output unit.

[0034] Specifically, as shown in Figure 1As shown, the power supply unit includes a power supply, a first chip U1, a second chip U2, a third chip U3 and their peripheral circuits. The positive electrode of the power supply is connected with the first power supply output end, and the negative electrode is grounded. The VIN pin of the first chip U1 is connected with the first power supply output end through the first diode D1 and the first fuse F1 in sequence. The EN pin of the first chip U1 is connected with the VIN pin of the first chip U1 through the first resistor R1. The connection line between the first diode D1 and the first fuse F1 is grounded through the first transient voltage suppression diode D13. The BOOT pin of the first chip U1 is connected with the PH pin of the first chip U1 through the second capacitor C2, and the PH pin of the first chip U1 is connected with the second power supply output end through the first inductor L1. The connection line between the first inductor L1 and the connection point of the BOOT pin and the PH pin is grounded through the second diode D2. The connection line between the first inductor L1 and the second power supply output end is connected to the ground through the resistance group composed of the second resistor R2, the third resistor R3 and the fourth resistor R4 in sequence and the third capacitor C3. The second power supply output end is connected with the third power supply output end through the fifth resistor R5. The third power supply output end is connected with the input winding of the three-winding transformer KB1 through the comparator and the field effect transistor group Q1 in sequence. The first output winding of the three-winding transformer KB1 is connected with the fourth power supply output end and the Vin pin of the second chip U2 through the first diode group and the first capacitor group in parallel, respectively. The first diode group is composed of the third diode D3 and the fourth diode D4 in series, and the first capacitor group is composed of the fourth capacitor C4 and the fifth capacitor C5 in series. The Vout pin of the second chip U2 is connected with the fifth power supply output end. The second output winding of the three-winding transformer KB1 is connected with the sixth power supply output end and the Vin pin of the third chip U3 through the second diode group and the second capacitor group in parallel in sequence. The second diode group is composed of the fifth diode D5 and the sixth diode D6 in series, and the second capacitor group is composed of the sixth capacitor C6 and the seventh capacitor C7 in series. The Vout pin of the third chip U3 is connected with the seventh power supply output end.

[0035] The peripheral circuit of the first chip U1 includes the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the first capacitor C1, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10 and the eleventh capacitor C11. The VIN pin of the first chip U1 is grounded through the first capacitor C1. The EN pin of the first chip U1 is grounded through the sixth resistor R6. The RT pin of the first chip U1 is grounded through the seventh resistor R7 and the eighth resistor R8 in sequence. The SS / T pin of the first chip U1 is grounded through the eighth capacitor C8. The COMP pin of the first chip U1 is grounded through the tenth capacitor C10. The connection line between the tenth capacitor C10 and the COMP pin is grounded through the ninth resistor R9 and the ninth capacitor C9 in sequence. The RVSNS pin of the first chip U1 is grounded through the fourth resistor R4. The third power supply output end is grounded through the eleventh capacitor C11.

[0036] The peripheral circuit of the second chip U2 includes a twelfth capacitor C12 and a thirteenth capacitor C13, the fourth power supply output end is grounded through the twelfth capacitor C12, and the fifth power supply output end is grounded through the thirteenth capacitor C13.

[0037] The peripheral circuit of the third chip U3 includes a tenth resistor R10, an eleventh resistor R11, a fourteenth capacitor C14 and a fifteenth capacitor C15, the sixth power supply output end is grounded through the fourteenth capacitor C14, the seventh power supply output end is grounded through the fifteenth capacitor C15, the connection line between the seventh power supply output end and the Vout pin of the third chip U3 is sequentially grounded through the tenth resistor R10 and the eleventh resistor R11, and the GND pin of the third chip U3 is grounded through the eleventh resistor R11.

[0038] The comparator includes a first Schmitt trigger and a second Schmitt trigger connected in series, the inverting input ends of the first Schmitt trigger and the second Schmitt trigger are connected with the third power supply output end, the output end of the first Schmitt trigger is connected with the non-inverting input end of the second Schmitt trigger, the output end of the first Schmitt trigger is connected with the non-inverting input end of the first Schmitt trigger through a twelfth resistor, the non-inverting input end of the first Schmitt trigger is grounded through a sixteenth capacitor, and the output end of the second Schmitt trigger is connected with the field effect tube group.

[0039] The field effect tube group includes an N-channel field effect tube and a P-channel field effect tube, the output end of the second Schmitt trigger is connected with the gate of the N-channel field effect tube and the P-channel field effect tube through a seventeenth capacitor C17 and an eighteenth capacitor C18, the connection line between the gate of the N-channel field effect tube and the seventeenth capacitor C17 is connected with the source of the N-channel field effect tube through a thirteenth resistor R13, the source of the N-channel field effect tube is connected with the input end of the input winding of the three-winding transformer KB1 through a nineteenth capacitor C19, the connection line between the nineteenth capacitor C19 and the input end of the input winding is grounded through a twentieth capacitor C20, the connection line between the gate of the P-channel field effect tube and the eighteenth capacitor C18 is grounded through a fourteenth resistor R14, the source of the P-channel field effect tube is grounded, and the drains of the N-channel field effect tube and the P-channel field effect tube are commonly connected with the input end of the input winding of the three-winding transformer KB1.

[0040] In the embodiment, the first chip U1 adopts TPD5401 chip, the second chip U2 and the third chip U3 all adopt HT7533 chip. The first transient voltage suppression diode D13 is of P65MB36CA. The first fuse F1 is of 0466500NRHF. The first diode D1, the second diode D2 and the third to sixth diodes are all of 1N5819. The first resistor R1 is of 330KΩ; the second resistor R2 is of 33KΩ; the third resistor R3 is of 120KΩ; the fourth resistor R4 is of 10KΩ; the fifth resistor R5 is of 10KΩ; the sixth resistor R6 is of 51KΩ; the seventh resistor R7 is of 5KΩ; the eighth resistor R8 is of 160KΩ; the ninth resistor R9 is of 121KΩ; the tenth resistor R10 is of 20KΩ; the eleventh resistor R11 is of 10KΩ; the twelfth resistor R12 is of 51KΩ; the thirteenth resistor R13 is of 300KΩ; the fourteenth resistor R14 is of 300KΩ. The first capacitor C1 is of 4.7μF; the second capacitor C2 is of 0.1μF; the third capacitor C3 is of 0.1μF; the fourth to seventh capacitors C7 are all of 1μF; the eighth capacitor C8 is of 0.015μF; the ninth capacitor C9 is of 0.0022μF; the tenth capacitor C10 is of 4.7μF; the eleventh capacitor C11 is of 0.1μF; the twelfth to fifteenth capacitors C15 are all of 1μF; the sixteenth capacitor C16 is of 0.0001μF; the seventeenth capacitor C17 is of 0.01μF; the eighteenth capacitor C18 is of 0.01μF; the nineteenth capacitor C19 is of 1μF; the twentieth capacitor C20 is of 1μF.

[0041] The voltage (24V) input from the power input end is input to the alarm output unit (first alarm subunit and second alarm subunit) through the first power supply output end in one way; in another way, it passes through the first fuse F1, is limited in voltage through the first transient voltage suppression diode D13, is input to the VIN pin of the first chip U1 in turn through the first diode D1 unidirectional conduction and the first capacitor C1 filtering. The PH pin of the first chip U1 outputs voltage, which is adjusted to 15V (the second power supply output end) through the first inductor L1 and the second resistor R2, the third resistor R3 and the fourth resistor R4 (as a voltage dividing resistor), and the 15V voltage is adjusted to VCC (the third power supply output end) through the fifth resistor R5 to supply power to the second chip U2, is connected to the 1 pin and the 4 pin of the three-winding transformer KB1 in turn through the Schmitt trigger and the field effect tube group, is isolated through the three-winding transformer KB1, is rectified to 12V" voltage (the fourth power supply output end) through the third diode D3, the fourth diode D4, the fourth capacitor C4 and the fifth capacitor C5 in one way (the 7 pin and the 8 pin), the 12V" voltage is directly supplied to the alarm output unit (the second alarm subunit) in one way, and is rectified to 3.3V (the fifth power supply output end) through the second chip U2 to supply power to the central processing unit in another way. The other way of voltage (the 5 pin and the 6 pin) isolated through the three-winding transformer KB1 is rectified to 12V voltage (the sixth power supply output end) through the fifth diode D5, the sixth diode D6, the sixth capacitor C6 and the seventh capacitor C7, the 12V voltage is directly supplied to the alarm output unit (the first alarm subunit) in one way, and is rectified to 5V (the seventh power supply output end) through the first chip U1 to supply power to the communication transmission unit in another way.

[0042] As Figure 2As shown, the signal acquisition unit is mainly used for sampling current signals input by various instruments and converting the current signals into digital signals. The signal acquisition unit comprises a signal acquisition end, a second transient voltage suppression diode D14, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, and a thirtieth capacitor C30. The signal acquisition end comprises a positive signal end and a negative signal end. The current signals of various instruments are input from the positive signal end and output from the negative signal end. The second transient voltage suppression diode D14, the twentieth resistor R20, and the twenty-first resistor R21 are connected in parallel between the positive signal end and the negative signal end in sequence. The positive signal end is connected with the AIN0 pin of the fourth chip U4 through the second transient voltage suppression diode D14, the twentieth resistor R20, the twenty-first resistor R21, and the nineteenth resistor R19. The connection line between the nineteenth resistor R19 and the AIN0 pin is sequentially grounded through the twenty-eighth capacitor C28, the twenty-ninth capacitor C29, and the twenty-fourth resistor R24 in parallel. The negative signal end is connected with the AIN4 / IEXC pin and the AIN1 pin of the fourth chip U4 through the twenty-second resistor R22 and the twenty-third resistor R23, respectively, again through the second transient voltage suppression diode D14, the twentieth resistor R20, the twenty-first resistor R21, the twenty-ninth capacitor C29, and the twenty-fourth resistor R24. The connection line between the twenty-third resistor R23 and the AIN1 pin of the fourth chip U4 is grounded through the thirtieth capacitor C30. The ADC acquisition channel 0 (AIN0 pin) and the acquisition channel 1 (AIN1 pin) of the fourth chip U4 form a differential sampling to obtain an AD sampling value of the current signal, which is used for calculating a signal current value.

[0043] The second transient voltage suppression diode D14 is of the type P65MB10CA. The resistance value of the nineteenth resistor R19 is 10KΩ; the twentieth resistor R20 and the twenty-first resistor are metal film resistors, and their sizes are 50Ω, respectively; the resistance value of the twenty-second resistor R22 is 100KΩ; the resistance value of the twenty-third resistor R23 is 100KΩ; the temperature coefficient of the twenty-fourth resistor R24 is 1.21K / 15ppm; the capacitance value of the twenty-eighth capacitor C28 is 0.1μF; the capacitance value of the twenty-ninth capacitor C29 is 0.01μF; and the capacitance value of the thirtieth capacitor C30 is 0.1μF.

[0044] As Figure 3As shown, the temperature acquisition unit is mainly used for monitoring the internal temperature of the control system, by collecting the resistance value of the temperature sensor and converting the resistance value of the temperature sensor into a digital signal. The temperature acquisition unit includes a temperature sensor PT1, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R27, a thirty-first capacitor C31, and a thirty-second capacitor C32. The temperature sensor is a resistance temperature sensor, specifically a Pt (platinum) resistance temperature sensor. The input end of the temperature sensor PT1 is connected to the AIN5 / IEXC pin and the AIN2 pin of the fourth chip U4 through the twenty-fifth resistor R25 and the twenty-sixth resistor R26, respectively. The connection point between the AIN2 pin of the fourth chip U4 and the twenty-sixth resistor R26 is grounded through the thirty-first capacitor C31. The output end of the temperature sensor PT1 is connected to the AIN3 pin of the fourth chip U4 through the twenty-seventh resistor R27. The connection line between the AIN3 pin of the fourth chip U4 and the twenty-seventh resistor R27 is grounded through the thirty-second capacitor C32. The output end of the temperature sensor PT1 is also grounded through the twenty-eighth resistor R28.

[0045] In this embodiment, the resistance value of the twenty-fifth resistor R25 is 100KΩ; the resistance value of the twenty-sixth resistor R26 is 100KΩ; the resistance value of the twenty-seventh resistor R27 is 100KΩ; the temperature coefficient of the twenty-eighth resistor R27 is 1.21K / 15ppm; the capacitance value of the thirty-first capacitor C31 is 0.1μF; and the capacitance value of the thirty-second capacitor C32 is 0.1μF.

[0046] The AIN5 / IEXC pin of the fourth chip U4 outputs a constant current power supply. After passing through the twenty-fifth resistor, one path is input to the AIN2 pin of the fourth chip U4 through the twenty-sixth resistor, and the other path is input to the temperature sensor. The constant current power supply passing through the temperature sensor has one path grounded through the twenty-eighth resistor and the other path input to the AIN3 pin of the fourth chip U4 through the twenty-seventh resistor. The ADC acquisition channel 2 (AIN2 pin) and the acquisition channel 3 (AIN3 pin) of the fourth chip U4 form a differential sampling to obtain the AD sampling value of the temperature sensor, which is used to calculate the internal temperature value.

[0047] As shown in FIG. 6, the temperature acquisition unit is mainly used for monitoring the internal temperature of the control system, by collecting the resistance value of the temperature sensor and converting the resistance value of the temperature sensor into a digital signal. The temperature acquisition unit includes a temperature sensor PT1, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R27, a thirty-first capacitor C31, and a thirty-second capacitor C32. The temperature sensor is a resistance temperature sensor, specifically a Pt (platinum) resistance temperature sensor. The input end of the temperature sensor PT1 is connected to the AIN5 / IEXC pin and the AIN2 pin of the fourth chip U4 through the twenty-fifth resistor R25 and the twenty-sixth resistor R26, respectively. The connection point between the AIN2 pin of the fourth chip U4 and the twenty-sixth resistor R26 is grounded through the thirty-first capacitor C31. The output end of the temperature sensor PT1 is connected to the AIN3 pin of the fourth chip U4 through the twenty-seventh resistor R27. The connection line between the AIN3 pin of the fourth chip U4 and the twenty-seventh resistor R27 is grounded through the thirty-second capacitor C32. The output end of the temperature sensor PT1 is also grounded through the twenty-eighth resistor R28. Figure 4As shown, the central processing unit includes the fourth chip U4 and its peripheral circuit. The AVDD pin, two IOVDD pins of the fourth chip U4 are connected with the fifth power supply output end of the power supply unit, the AIN0 pin and the AIN1 pin of the fourth chip U4 are used as the port for differential sampling with the signal acquisition unit, the AIN4 / IEXC pin of the fourth chip U4 is used as the power supply port for providing constant current power supply for the signal acquisition unit, the AIN2 pin and the AIN3 pin of the fourth chip U4 are used as the port for differential sampling with the temperature acquisition unit, the AIN5 / IEXC pin of the fourth chip U4 is used as the power supply port for providing constant current power supply for the temperature acquisition unit, the P1.5 / IRQ5 / PWM3 / SCLK0 pin and the P1.6 / IRQ6 / PWM4 / MOSI0 pin of the fourth chip U4 are used as the port for data transmission with the alarm output unit, the P0.7 / POR / SOUT pin and the P0.6 / IRQ2 / SIN pin of the fourth chip U4 are used as the port for data transmission with the LED display unit, the P0.4 / RTS / ECI.KO pin, the P0.2 / MOSI1 / SDA / SOUT pin and the P0.1 / SCI.KI / SCI. / SIN pin of the fourth chip U4 are used as the port for data transmission with the communication transmission unit.

[0048] The peripheral circuit of the fourth chip U4 includes the twenty-first capacitor C21, the twenty-second capacitor C22, the twenty-third capacitor C23, the twenty-fourth capacitor C24, the twenty-fifth capacitor C25, the twenty-sixth capacitor C26, the twenty-seventh capacitor C27, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18 and the eight-pin crystal oscillator chip J1. The AVDD pin of the fourth chip U4 is grounded through the twenty-first capacitor C21, the AVDD_REG pin and the DVDD_REG pin of the fourth chip U4 are grounded through the twenty-second capacitor C22 and the twenty-third capacitor C23 in parallel, the two IOVDD pins of the fourth chip U4 are grounded through the twenty-fourth capacitor C24 and the twenty-fifth capacitor C25 in parallel; the IREF pin of the fourth chip U4 is grounded through the fifteenth resistor R15, the INT_REF pin of the fourth chip U4 is grounded through the twenty-sixth capacitor C26; the The foot is connected with the fifth power supply output end of the power supply unit in turn through the sixteenth resistor R16 and the seventeenth resistor R17, and the connecting line between the sixteenth resistor R16 and the seventeenth resistor R17 is grounded through the twenty-seventh capacitor C27; the EP foot and the GND_SW foot of the fourth chip U4 are grounded; the SWDIO foot of the fourth chip U4 is connected with the 3 foot of the eight-pin crystal oscillator chip J1, and the SWCI.K of the fourth chip U4 is connected with the 5 foot of the eight-pin crystal oscillator chip J1; the P2.2 / BM foot of the fourth chip U4 is connected with the fifth power supply output end of the power supply unit through the eighteenth resistor; the 7 foot of the eight-pin crystal oscillator chip J1 is connected with the connecting line between the P2.2 / BM foot of the fourth chip U4 and the eighteenth resistor; and the 2 foot of the eight-pin crystal oscillator chip J1 is grounded.

[0049] The fourth chip U4 adopts an ADuCM361 chip. The ADuCM361 chip is a low-power, fully integrated 24-bit data acquisition system, and integrates a dual-core, high-performance, multi-channel sigma-delta type ADC, an ARM Cortex MCU and a Flash / EE memory on a single chip. The capacitance value of the twenty-first capacitor C21 is 0.1 μF; the capacitance value of the twenty-second capacitor C22 is 0.1 μF; the capacitance value of the twenty-third capacitor C23 is 0.1 μF; the capacitance value of the twenty-fourth capacitor C24 is 0.1 μF; the capacitance value of the twenty-fifth capacitor C25 is 0.1 μF; the capacitance value of the twenty-sixth capacitor C26 is 1 μF; and the capacitance value of the twenty-seventh capacitor C27 is 0.1 μF. The resistance value of the fifteenth resistor R15 is 300 KΩ; the resistance value of the sixteenth resistor R16 is 10 KΩ; the resistance value of the seventeenth resistor R17 is 10 KΩ; and the resistance value of the eighteenth resistor R18 is 100 KΩ.

[0050] The central processing unit calculates and stores the temperature value through the resistance value transmitted by the temperature acquisition unit, and facilitates communication transmission. The current value is calculated and stored through the digital signal transmitted by the signal acquisition unit, and the first alarm subunit and the second alarm subunit are controlled to output 24V through the P1.6 / IRQ6 / PWM4 / MOSI0 foot and the P1.5 / IRQ5 / PWM3 / SCLK0 foot of the fourth chip U4 respectively, so as to realize alarm output. At the same time, the color (red, orange, green) of the light-emitting diode is controlled to display through the P0.7 / POR / SOUT foot and the P0.6 / IRQ2 / SIN foot of the fourth chip U4.

[0051] As Figure 5The alarm output unit is used to make corresponding alarm output according to the current value calculated by the central processing unit. The alarm output unit includes a first alarm sub-unit and a second alarm sub-unit which have the same structure. The first alarm sub-unit includes a first relay JD1, a first switch K1, a second switch K2, a seventh diode D7, an eighth diode D8, a first triode Q2, a twenty-ninth resistor R29 and a thirtieth resistor R30. The 4th and 5th pins of the first relay JD1 are connected with the first power supply output end through the first switch K1, the 2nd and 7th pins of the first relay JD1 are connected with the first power supply output end through the second switch K2, the 3rd and 6th pins of the first relay JD1 are connected with the output end in parallel, the 1st pin of the first relay JD1 is connected with the fourth power supply output end, the connection line between the 1st pin of the first relay JD1 and the fourth power supply output end is connected with the collector of the first triode Q2 through the seventh diode D7 and the eighth diode D8 in sequence, the 8th pin of the first relay JD1 is connected with the collector of the first triode Q2, the connection line between the seventh diode D7 and the eighth diode D8 is connected with the connection line between the 8th pin of the first relay JD1 and the collector of the first triode Q2, the P1.6 / IRQ6 / PWM4 / MOSI0 pin of the fourth chip U4 is connected with the base of the first triode Q2 through the twenty-ninth resistor R29, and the connection line between the first triode Q2 and the twenty-ninth resistor R29 is grounded through the thirtieth resistor.

[0052] The model of the first relay is G6K-2F-Y12VDC, the first triode is 9014 triode, the model of the seventh diode D7 is P65MB10CA, the model of the eighth diode D8 is BAV99, the model of the first triode Q2 is MMB T9014D, the resistance value of the twenty-ninth resistor R29 is 10KΩ, and the resistance value of the thirtieth resistor R30 is 10KΩ.

[0053] The second alarm subunit comprises a second relay JD2, a third switch K3, a fourth switch K4, a ninth diode D9, a twelfth diode D10, a second triode Q3, a thirty-first resistor R31 and a thirty-second resistor R32. The fourth pin and the fifth pin of the second relay JD2 are connected with the first power supply output end through the third switch K3, the second pin and the seventh pin of the second relay JD2 are connected with the first power supply output end through the fourth switch K4, the third pin and the sixth pin of the second relay JD2 are connected with the output end in parallel, the first pin of the second relay JD2 is connected with the sixth power supply output end, and the connection line between the first pin of the second relay JD2 and the fourth power supply output end is connected with the collector of the second triode Q3 in sequence through the ninth diode D9 and the twelfth diode D10, the eighth pin of the second relay JD2 is connected with the collector of the second triode Q3, the connection line between the ninth diode D9 and the twelfth diode D10 is connected with the connection line between the eighth pin of the second relay JD2 and the collector of the second triode Q3, the P1.5 / IRQ5 / PWM3 / SCLK0 pin of the fourth chip U4 is connected with the base of the second triode Q3 through the thirty-first resistor R31, and the connection line between the second triode Q3 and the thirty-first resistor R31 is grounded through the thirty-second resistor R32.

[0054] The model of the second relay JD2 is G6K-2F-Y12VDC, the ninth diode D9 and the twelfth diode D10 are BAV99, the model of the second triode Q3 is MMBT9014D, the resistance value of the thirty-first resistor R31 is 10KΩ, and the resistance value of the thirty-second resistor R32 is 10KΩ.

[0055] As shown in FIG. 6, the LED display unit displays different colors (such as red, orange and green) through the current value calculated by the central processing unit. Figure 6 The LED display unit comprises a light-emitting diode D12, an eleventh diode D11, a thirty-third resistor R33 and a thirty-fourth resistor R34, the P0.7 / POR / SOUT pin of the fourth chip U4 is connected with the anode of the light-emitting diode D12 through the thirty-third resistor R33, the P0.6 / IRQ2 / SIN pin of the fourth chip U4 is connected with the anode of the eleventh diode D11 through the thirty-fourth resistor R34, and the cathodes of the light-emitting diode D12 and the eleventh diode D11 are grounded.

[0056] The resistance value of the thirty-third resistor R331 is 1KΩ, and the resistance value of the thirty-fourth resistor R34 is 1KΩ.

[0057] As shown in FIG. 6, the LED display unit displays different colors (such as red, orange and green) through the current value calculated by the central processing unit. Figure 7As shown, the communication transmission unit is mainly used for 485 signal transmission, and realizes bidirectional communication. The communication transmission unit comprises a fifth chip U5, 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 thirty-third capacitor C33 and a thirty-fourth capacitor C34. The RO pin of the fifth chip U5 is connected with the P0.4 / RTS / ECI.KO pin of the fourth chip U4 through the thirty-fifth resistor R35, the DE pin of the fifth chip U5 is connected with the P0.2 / MOSI1 / SDA / SOUT pin of the fourth chip U4 through the thirty-sixth resistor R36, the DI pin of the fifth chip U5 is connected with the P0.1 / SCI.KI / SCI. / SIN pin of the fourth chip U4 through the thirty-seventh resistor R37, the VCC pin of the fifth chip U5 is connected with the seventh power supply output end, the A pin of the fifth chip U5 is connected with the first communication port, the B pin of the fifth chip U5 is connected with the second communication port, the connection line between the VCC pin of the fifth chip U5 and the seventh power supply output end is connected with the A pin of the fifth chip U5 and the first communication port through the parallel connection of the thirty-third capacitor C33 and the thirty-eighth resistor R38, the connection line between the B pin of the fifth chip U5 and the second communication port is connected with the ground through the parallel connection of the thirty-fourth capacitor C34 and the thirty-ninth resistor R38, the thirty-eighth resistor R38 and the thirty-ninth resistor R39 are connected with each other through the third transient voltage suppression diode D15, and the GND pin of the fifth chip U5 is connected with the ground.

[0058] The fifth chip U5 adopts an SP485 chip. The resistance values of the thirty-fifth resistor R35, the thirty-sixth resistor R36 and the thirty-seventh resistor R37 are all 100KΩ; the resistance values of the thirty-eighth resistor R38 and the thirty-ninth resistor R39 are both 20KΩ; and the capacitance values of the thirty-third capacitor C33 and the thirty-fourth capacitor C34 are both 0.1uF.

[0059] The on-site control system based on the split-range control logic provided by the application utilizes the ADC differential technology to independently control the system, and has the advantages of low cost, convenient installation, simple maintenance and troubleshooting, and low maintenance cost, as compared with the independent controllers such as the controllers and PLCs selected and matched with various instruments. According to the split-range control logic, the on-site control system can be conveniently installed on various instruments, and is used for directly controlling the actuators in the actual production process to adapt to various needs, and directly feeds back and controls signals and alarms. Overall, the on-site control system provided by the application has the advantages of simple wiring and debugging, low cost, and low power consumption, and is suitable for on-site control in various installation conditions.

[0060] ​Those skilled in the art will appreciate that the embodiments described herein are presented for purposes of illustration and that the inventive principles are not limited to these particular embodiments. Other variations and modifications can be made to the embodiments without departing from the spirit and scope of the inventive principles.

Claims

1. A split-range control logic based on-site control system, characterized by: The central processing unit is connected with a signal acquisition unit, a temperature acquisition unit, a communication output unit, an alarm output unit, an LED display unit and a power supply unit; The signal acquisition unit differentially samples the input current signal and transmits the sampled signal to the central processing unit; specifically, the signal acquisition unit comprises a signal acquisition end, a second transient voltage suppression diode, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor and a twenty-fourth resistor; the signal acquisition end comprises a positive signal end and a negative signal end; the positive pole of the input current signal passes through the positive signal end and is limited in voltage by the second transient voltage suppression diode, and is input to the ADC acquisition channel 0 of the central processing unit through the nineteenth resistor; the other passes through the sampling resistor of the parallel twentieth resistor and twenty-first resistor, and is divided into four sub-paths again, the first sub-path flows out through the negative signal end, the second sub-path is grounded through the twenty-fourth resistor, the third sub-path is connected to the constant current source tube pin of the central processing unit through the twenty-second resistor, and the fourth sub-path is connected to the ADC acquisition channel 1 of the central processing unit through the twenty-third resistor; the ADC acquisition channel 0 and the acquisition channel 1 form differential sampling to obtain the AD sampling signal of the current signal; The temperature acquisition unit differentially samples the signal collected by the temperature sensor and transmits the sampled signal to the central processing unit; the temperature acquisition unit comprises a temperature sensor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor and a twenty-eighth resistor; the central processing unit outputs a constant current power supply to the temperature acquisition unit, which is divided into two paths through the twenty-fifth resistor, one path is connected to the ADC acquisition channel 2 of the central processing unit through the twenty-sixth resistor; the other path passes through the temperature sensor and is divided into two sub-paths again, the first sub-path is grounded through the twenty-eighth resistor, and the second sub-path is connected to the ADC acquisition channel 3 of the central processing unit through the twenty-seventh resistor; the ADC acquisition channel 2 and the acquisition channel 3 form differential sampling to obtain the AD sampling signal of the temperature sensor; The central processing unit receives the signals transmitted from the signal acquisition unit and the temperature acquisition unit, processes the signals to obtain corresponding current values and temperature values, and transmits the current values or / and temperature values to the alarm output unit and the LED display unit; the communication output unit receives the data processed by the central processing unit and transmits the data remotely; the power supply unit provides power supply for the central processing unit, the communication output unit and the alarm output unit.

2. The split-range control logic based on-the-grid control system of claim 1, wherein: The temperature sensor is a Pt resistance temperature sensor.

3. The split-range control logic based on-the-grid control system of claim 1, wherein: The central processing unit comprises a fourth chip and peripheral circuits thereof, the fourth chip comprising AIN0 pin, AIN1 pin, AIN2 pin and AIN3 pin connected with ADC acquisition channel 0, acquisition channel 1, acquisition channel 2 and acquisition channel 3; the fourth chip obtains corresponding current value according to AD sampling signal obtained from acquisition channel 0 and acquisition channel 1, and then gives corresponding lower end switch signal according to current setting value; the fourth chip obtains corresponding temperature value according to AD sampling signal obtained from acquisition channel 2 and acquisition channel 3, and then transmits to the communication transmission unit.

4. The split-range control logic based on-the-grid control system of claim 3, wherein: The fourth chip further comprises P0.4 / RTS / ECI.KO pin, P0.2 / MOSI1 / SDA / SOUT pin and P0.1 / SCI.KI / SCI. / SIN pin as data remote transmission port with the communication transmission unit, P1.5 / IRQ5 / PWM3 / SCLK0 pin, P1.6 / IRQ6 / PWM4 / MOSI0 pin as data transmission port with the alarm output unit and P0.7 / POR / SOUT pin, P0.6 / IRQ2 / SIN pin as data transmission port with the LED display unit.

5. The split-range control logic based on-the-spot control system of claim 4, wherein: The communication transmission unit comprises a fifth chip, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a thirty-third capacitor and a third transient voltage suppression diode; a pin A and a pin B of the fifth chip are respectively connected to a first communication port and a second communication port through the thirty-eighth resistor pull-up and the thirty-ninth resistor pull-down, and the pin A and the pin B are protected by voltage limiting through the third transient voltage suppression diode; a RO pin of the fifth chip is connected with a P0.4 / RTS / ECI.KO pin of a fourth chip through the thirty-fifth resistor, and a pin DE and a pin of the fifth chip are connected with a P0.2 / MOSI1 / SDA / SOUT pin of the fourth chip through the thirty-sixth resistor after connection, a DI pin of the fifth chip is connected with a P0.1 / SCI.KI / SCI. / SIN pin of the fourth chip through the thirty-seventh resistor, and a VCC pin and a GAD pin of the fifth chip are respectively used as a power port and a ground port. The communication transmission unit comprises a fifth chip, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a thirty-third capacitor and a third transient voltage suppression diode; a pin A and a pin B of the fifth chip are respectively connected to a first communication port and a second communication port through the thirty-eighth resistor pull-up and the thirty-ninth resistor pull-down, and the pin A and the pin B are protected by voltage limiting through the third transient voltage suppression diode; a RO pin of the fifth chip is connected with a P0.4 / RTS / ECI.KO pin of a fourth chip through the thirty-fifth resistor, and a pin DE and a pin of the fifth chip are connected with a P0.2 / MOSI1 / SDA / SOUT pin of the fourth chip through the thirty-sixth resistor after connection, a DI pin of the fifth chip is connected with a P0.1 / SCI.KI / SCI. / SIN pin of the fourth chip through the thirty-seventh resistor, and a VCC pin and a GAD pin of the fifth chip are respectively used as a power port and a ground port.

6. The split-range control logic based on-the-grid control system of claim 4, wherein: The alarm output unit comprises a first alarm subunit and a second alarm subunit which are completely identical in structure, the first alarm subunit is connected with P1.6 / IRQ6 / PWM4 / MOSI0 pin of the fourth chip, and the second alarm subunit is connected with P1.5 / IRQ5 / PWM3 / SCLK0 pin of the fourth chip.

7. The split-range control logic based on-the-grid control system of claim 4, wherein: The LED display unit comprises a light emitting diode, an eleventh diode, a thirty-third resistor and a thirty-fourth resistor, P0.7 / POR / SOUT pin of the fourth chip is connected with the anode of the light emitting diode through the thirty-third resistor, P0.6 / IRQ2 / SIN pin of the fourth chip is connected with the anode of the eleventh diode through the thirty-fourth resistor, and the cathodes of the light emitting diode and the eleventh diode are grounded.

8. The split-range control logic based on-the-grid control system of claim 1, wherein: The power supply unit comprises a power supply, a first chip, a second chip, a third chip and peripheral circuits thereof; the positive pole of the power supply is connected with a first power supply output end, and the negative pole is grounded; the first power supply output end is divided into two paths, one of which is connected with a switch of the alarm output unit to supply power for the switch, and the other of which is limited in voltage through a fuse, a first transient voltage suppression diode, a first diode unidirectionally conducted and a first capacitor filtered, and then input to a VIN pin of the first chip; a PH pin of the first chip is connected with a second power supply output end through a first inductor and three voltage dividing resistors of a second resistor, a third resistor and a fourth resistor connected in series; the second power supply output end adjusts VCC through a fifth resistor to supply power for the second chip as a third power supply output end; The third power supply output end is connected with the input winding of the three-winding transformer through the comparator and the field effect tube group; the first output winding of the three-winding transformer is connected with the fourth power supply output end after being rectified and voltage-doubled through the parallel first diode group and the first capacitor group, the fourth power supply output end is connected with the Vin pin of the second chip; the second output winding of the three-winding transformer is connected with the sixth power supply output end after being rectified and voltage-doubled through the parallel second diode group and the second capacitor group in turn, the sixth power supply output end is connected with the Vin pin of the third chip; the fourth power supply output end and the sixth power supply output end are also connected with the relay of the alarm output unit, and supply power for the relay; the Vout pin of the second chip is connected with the fifth power supply output end, and supply power for the central processing unit; the Vout pin of the third chip is connected with the seventh power supply output end, and supply power for the communication transmission unit.

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