CN-121995903-A - Intelligent point inspection instrument

CN121995903ACN 121995903 ACN121995903 ACN 121995903ACN-121995903-A

Abstract

The application belongs to the technical field of industrial automatic detection and instruments and meters, and particularly discloses an intelligent spot inspection instrument which comprises a main control MCU, wherein the main control MCU is electrically connected with a digital quantity input module, a digital quantity output module, an analog quantity input module and an analog quantity output module, the digital quantity input module is used for outputting a switching quantity signal to a distributed control system DCS so as to simulate the switching state of field equipment, the digital quantity output module is used for detecting the switching quantity signal state output by the distributed control system DCS and judging whether the output of the switching quantity signal state is correct, the analog quantity input module is used for outputting an adjustable analog quantity current signal to the distributed control system DCS so as to simulate field transmission, and the analog quantity output module is used for detecting the analog quantity current signal output by the distributed control system DCS and reading the current value of the analog quantity signal. The application can realize the bidirectional closed loop test of the full-channel digital quantity and analog quantity signals of the distributed control system under the condition of not interrupting the system operation.

Inventors

FENG QINGHUA
WEN JIAYING
LI YONGYAN
LI CHANGRONG
YUAN YUTING
Wang Zhuoxu
Shen Linjing
ZHANG LI
REN XIAOYU
ZHANG YIXIN
SUN ZHAOSHAN
GAO SONG
LIU ZIRUI
Yue Mengchu
FENG LULU

Assignees

陕西职业技术学院
西安蒙特瑞自动化技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260403

Claims (10)

1. An intelligent spot inspection instrument, which is characterized by comprising: the main control MCU is electrically connected with a digital quantity input module, a digital quantity output module, an analog quantity input module and an analog quantity output module, The digital quantity input module is used for outputting a switching quantity signal to the distributed control system DCS so as to simulate the switching state of the field device; the digital quantity output module is used for detecting the state of a switching value signal output by the distributed control system DCS and judging whether the output is correct or not; The analog input module is used for outputting an adjustable analog current signal to the distributed control system DCS so as to simulate on-site transmission; The analog quantity output module is used for detecting analog quantity current signals output by the distributed control system DCS and reading current values of the analog quantity current signals.
2. The spot check meter of claim 1, wherein the digital quantity input module comprises: A wireless Lora module and an isolation module, wherein, The main control MCU drives the liquid crystal display screen through a parallel or serial display interface to realize data writing and man-machine interaction; The main control MCU is connected with the wireless Lora module through a standard TTL level UART serial interface, so that long-distance wireless communication is realized; The main control MCU is connected to a digital quantity input terminal of the distributed control system DCS through the isolation module by a general input/output pin so as to simulate the switching state of the field device.
3. The spot check meter of claim 2, wherein the wireless Lora module comprises: The wireless Lora chip is characterized in that a first mode selection pin of the wireless Lora chip is connected with a first grounding end through a jumper wire, and a second mode selection pin is connected with a 3.3V power supply through a first resistor; The serial data input pin of the wireless Lora chip is connected to the serial port transmitting pin of the main control MCU through a signal receiving line, the serial data output pin is connected to the serial port receiving pin of the main control MCU through a signal transmitting line, and the state indication/awakening output pin of the wireless Lora chip is connected with the cathode of the first light emitting diode; the first end of the second resistor is connected with a 3.3V power supply, and the second end of the second resistor is connected with the anode of the first light-emitting diode; The first capacitor is connected in parallel between a power pin and a ground pin of the wireless Lora chip.
4. The spot check meter of claim 2, wherein the isolation module comprises: The DC-DC isolation conversion chip, the connection interface, the self-recovery fuse, the first diode, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the third resistor, wherein, The input pin of the DC-DC isolation conversion chip is connected with a 24V power supply through a self-recovery fuse; The anode of the first diode is connected with a third pin of the connection interface and a third grounding end, and the cathode of the first diode is connected with an input pin of the DC-DC isolation conversion chip; the first pin of the connection interface is connected with a 24V power supply; the anode of the second capacitor is connected with the input pin of the DC-DC isolation conversion chip, and the cathode of the second capacitor is connected with the third grounding end; The positive voltage output pin of the DC-DC isolation conversion chip outputs a 5V isolation power supply, and the isolation output ground pin is connected with a fourth ground terminal; The third capacitor, the fourth capacitor and the fifth capacitor are simultaneously and parallelly arranged between a positive voltage output pin and a fourth grounding end of the DC-DC isolation conversion chip; The first end of the third resistor is connected with the fourth grounding end, and the second end of the third resistor is connected with the fifth grounding end.
5. The spot check meter of claim 1, wherein the digital quantity output module comprises: The main control chip is respectively and electrically connected with a storage and reset control unit, a debugging programming interface unit, an RTC power supply backup and status indication unit and a clock and reset management unit, The storage and reset control unit is used for nonvolatile storage of system parameters and operation data and providing reset control when the power supply is abnormal; the debugging programming interface unit is used for providing a standard hardware debugging and program downloading interface so as to support online simulation, firmware updating and system diagnosis; The RTC power supply backup and status indication unit is used for supplying power to the real-time clock when the main power supply fails so as to keep time continuity; the clock and reset management unit is used for providing a high-precision clock source for the main control chip and is used for power supply monitoring and resetting.
6. The spot check meter according to claim 5, wherein the storage and reset control unit comprises: An EEPROM memory chip, a fifth resistor, a sixth resistor, a power supply monitoring reset chip, wherein, The first address pin, the second address pin, the third address pin and the grounding pin of the EEPROM memory chip are connected with a seventh grounding end, the power supply pin is connected with a 3.3V power supply, the write-protection pin is connected with a first multiplexing pin of the main control chip, the serial clock pin is connected with a second multiplexing pin of the main control chip U3, and the serial data pin is connected with a third multiplexing pin of the main control chip; The first ends of the fifth resistor and the sixth resistor are both connected with a 3.3V power supply, the second end of the fifth resistor is connected with a serial data pin of the EEPROM memory chip, and the second end of the sixth resistor is connected with a serial clock pin of the EEPROM memory chip.
7. The spot check meter of claim 5, wherein the debug programming interface unit comprises: A debug interface connector, a seventh resistor, and an eighth resistor, wherein, The fourth pin of the debugging interface connector is connected with the eighth grounding end; The first end of the seventh resistor is connected with a 3.3V power supply, and the second end of the seventh resistor is connected with a third pin of the debugging interface connector and simultaneously connected with a first multifunctional multiplexing pin of the main control chip; The first end of the eighth resistor is connected with a 3.3V power supply, and the second end of the eighth resistor is connected with a second pin of the debugging interface connector and simultaneously connected with a second multifunctional multiplexing pin of the main control chip; the fourth pin of the debug interface connector is connected with the eighth ground terminal.
8. The spot check meter of claim 5, wherein the RTC power backup and status indication unit comprises: a sixth capacitor, a ninth resistor and a second light emitting diode, wherein, The first end of the sixth capacitor is connected with the backup power input pin of the main control chip and is connected with a 3.3V power supply, and the second end of the sixth capacitor is connected with the tenth grounding end; And the cathode of the second light-emitting diode is connected with a state indication LED control pin of the main control chip, and the anode of the second light-emitting diode is connected with a 3.3V power supply through a ninth resistor.
9. The spot check meter according to claim 5, wherein the clock and reset management unit comprises: a crystal oscillation transistor, a seventh capacitor, an eighth capacitor, a tenth resistor and a power supply monitoring reset chip, wherein, The first end of the crystal oscillation transistor is connected with an oscillator output pin of the main control chip, the third end of the crystal oscillation transistor is connected with an oscillator input pin of the main control chip, and the fourth end and the second end of the crystal oscillation transistor are simultaneously connected with an eleventh grounding end; the seventh capacitor is arranged in parallel between the output pin of the oscillator of the main control chip and the eleventh grounding end; the eighth capacitor is arranged in parallel between the input pin of the oscillator of the main control chip and the eleventh grounding end; The ground pin of the power supply monitoring reset chip is connected with the twelfth ground end, the reset output pin is connected with the reset input pin of the main control chip through the tenth resistor, and the power supply pin is connected with a 3.3V power supply.
10. The spot check meter of claim 5, wherein the digital quantity output module further comprises: a level shift and interface protection unit, the unit comprising: an RS-232 transceiver chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a first transient voltage suppression diode array, wherein, The ninth capacitor is connected between the first positive terminal connection pin and the first negative terminal connection pin of the RS-232 transceiver chip in a bridging manner; The tenth capacitor is connected between the second positive end connection pin and the second negative end connection pin of the RS-232 transceiver chip in a bridging mode; The first end of the eleventh capacitor and the first end of the twelfth capacitor are respectively connected with a positive charge pump voltage output pin and a negative charge pump voltage output pin of the RS-232 transceiver chip, and the second end of the eleventh capacitor is simultaneously connected with a fourteenth grounding end; The first input/output protection channel of the first transient voltage suppression diode array is connected to a line between the serial data output line of the RS-232 transceiver chip and the external connector, and the second input/output protection channel is connected to a line between the serial data input line of the RS-232 transceiver chip and the external connector; in addition, the TTL level data input pin of the RS-232 transceiver chip is connected with the serial data generation output end of the main control chip, the TTL level data output pin is connected with the serial data receiving input end of the main control chip, the grounding pin is connected with the thirteenth grounding end, and the power supply pin is connected with a 3.3V power supply.

Description

Intelligent point inspection instrument Technical Field The application belongs to the technical field of industrial automatic detection and instruments and meters, and particularly relates to an intelligent spot inspection instrument. Background In the field of industrial automation, a distributed control system DCS is used as a core control platform, the accuracy and reliability of an input/output channel of the distributed control system DCS are directly related to the stability and safety of a production process, however, the prior art lacks a portable special device capable of simultaneously completing the bidirectional closed loop test of digital and analog signals on the premise of not interrupting the system operation, so that the processes of on-site debugging, regular maintenance and fault diagnosis often depend on scattered instruments, have complicated operation and low efficiency, and are difficult to comprehensively verify the signal integrity, response precision and anti-interference capability of the whole channel of the DCS, and maintenance dead zones and potential risks exist. Therefore, there is a need for an integrated, high-precision, multifunctional spot check meter with electrical isolation capability to realize efficient, reliable and full-coverage testing of distributed control system DCS. Disclosure of Invention Aiming at the defects in the prior art, the application aims to provide the intelligent point inspection instrument, which can realize bidirectional closed loop test of digital quantity and analog quantity signals of a distributed control system in a full channel under the condition of not interrupting the system operation and can improve the debugging efficiency, maintenance reliability and fault prevention capability of the point inspection instrument. In order to achieve the above purpose, the present application provides the following technical solutions: The intelligent spot inspection instrument comprises a main control MCU, wherein the main control MCU is electrically connected with a digital quantity input module, a digital quantity output module, an analog quantity input module and an analog quantity output module, the digital quantity input module is used for outputting switching quantity signals to a distributed control system DCS so as to simulate the switching state of field equipment, the digital quantity output module is used for detecting the switching quantity signal state output by the distributed control system DCS and judging whether the output is correct or not, the analog quantity input module is used for outputting adjustable analog quantity current signals to the distributed control system DCS so as to simulate field transmission, and the analog quantity output module is used for detecting the analog quantity current signals output by the distributed control system DCS and reading current values of the analog quantity current signals. The digital quantity input module comprises a wireless Lora module and an isolation module, wherein the main control MCU drives a liquid crystal display screen through a parallel or serial display interface to realize data writing and man-machine interaction, the main control MCU is connected with the wireless Lora module through a standard TTL level UART serial interface to realize remote wireless communication, and the main control MCU is connected to a digital quantity input terminal of a distributed control system DCS through a general input/output pin through the isolation module to simulate the on-off state of field equipment. The wireless Lora module comprises a wireless Lora chip, wherein a first mode selection pin of the wireless Lora chip is connected with a first grounding end through a jumper wire, a second mode selection pin of the wireless Lora chip is connected with a 3.3V power supply through a first resistor, a serial data input pin of the wireless Lora chip is connected with a serial port transmitting pin of a main control MCU through a signal receiving wire, a serial data output pin of the wireless Lora chip is connected with a serial port receiving pin of the main control MCU through a signal transmitting wire, a state indication/awakening output pin of the wireless Lora chip is connected with a cathode of a first light emitting diode, a first end of a second resistor is connected with the 3.3V power supply, a second end of the second resistor is connected with an anode of the first light emitting diode, and a first capacitor is connected between the power supply pin and the grounding pin of the wireless Lora chip in parallel. The isolation module comprises a DC-DC isolation conversion chip, a connection interface, a self-recovery fuse, a first diode, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a third resistor, wherein an input pin of the DC-DC isolation conversion chip is connected with a 24V power supply through the self-recovery fuse, an anode of the first dio