CN210626575U

CN210626575U - Multi-way switching value scanning detection system

Info

Publication number: CN210626575U
Application number: CN201921068687.7U
Authority: CN
Inventors: 刘艳丽; 李宏; 李梁; 陈莉
Original assignee: Shaanxi Gaoke Electric Power Electronics Co ltd
Current assignee: Shaanxi Gaoke Electric Power Electronics Co ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-05-26
Anticipated expiration: 2029-07-10

Abstract

A multi-channel switching value scanning detection system comprises a detection control unit, wherein the detection control unit is connected with an input filter, an isolation circuit, a shaping circuit, an output isolation circuit and a drive circuit, so that an input port and an output port work in a scanning mode, the switching value states of all paths are detected in a round-robin mode, detection results are processed, the detection control unit is connected with a switching value position display circuit, the row and column positions of switching value actions are displayed, the detection control unit is connected with an RS232 serial port communication circuit, the communication function of a host computer is realized, the communication function of the host computer is connected with two 485 communication circuits, and the communication function of cascade work of a PLC and two detection systems is realized respectively. The utility model discloses synthesize and realize that multi-way switching value scans and detects, realize detecting good effects such as nimble, reliable, the way number is many and small, with low costs, transfer distance is far away.

Description

Multi-way switching value scanning detection system

Technical Field

The utility model relates to a detect, control technical field, in particular to multi-way switching value scanning detecting system.

Background

In the modern industrial production and scientific research process, the switching value signal change is often required to be detected, and then information such as working state, influencing factors and abnormal factors is judged according to the switching value signal change relation. For example, in an industrial measurement and control system, switching signals generated by devices such as an electromagnetic relay and an auxiliary switch need to be detected and judged so as to make a corresponding control strategy. Some data acquisition cards or corresponding digital quantity extension modules in the market can meet the basic requirement for detecting the switching quantity signals, but no special application exists for detecting dozens of or even hundreds of switching quantity signals in real time, the cost and the volume are greatly improved along with the increase of the number of detection paths, and the field wiring is complicated. On the other hand, when the switching value is transmitted in a long distance, the switching value is easily subjected to external electromagnetic interference, so that the transmission signal is distorted or distorted; and the switching value is connected to the microprocessor through a single end of the long cable, and the distance of the cable is limited due to the line impedance and the voltage drop of the cable.

Disclosure of Invention

In order to overcome the deficiencies of the prior art, the utility model aims to provide a multi-way switching value scanning detecting system synthesizes and realizes multi-way switching value scanning detection, has and detects good effects such as nimble, reliable, the way is many and small, with low costs, transfer distance are far away.

In order to realize the purpose, the utility model discloses a technical scheme is:

a multi-way switching value scanning detection system comprises a detection control unit 3, wherein the detection control unit 3 is connected with an input filtering circuit, an isolation circuit, a shaping circuit 1, an output isolation circuit and a driving circuit 2, so that an input port and an output port work in a scanning mode, each switching value state is detected in a round-robin mode, a detection result is processed, the detection control unit 3 is connected with a switching value position display circuit 4, the row and column positions of switching value actions are displayed, the detection control unit is connected with an RS232 serial port communication circuit 5, the communication function of a host computer is realized, the communication function of the host computer is connected with two 485 communication circuits 6, and the communication function of cascade work of a PLC and two detection systems is realized respectively.

The output isolation and drive circuit 2 is used for isolating and amplifying the output signal of the detection control unit.

The detection control unit 3 controls the scanning detection mode, displays the detection result and simultaneously transmits the detection result to the PLC or the upper computer in a communication mode for monitoring control.

The RS232 serial port communication circuit 5 comprises an RS232 level conversion circuit and a communication indicating circuit, and is used for providing a communication interface of a scanning detection system and an upper computer and realizing real-time monitoring of a detection result of the scanning system.

The two RS485 communication circuits comprise an RS485 level conversion circuit and a communication indicating circuit, and are respectively provided with communication interfaces of the scanning detection system and the PLC, and communication interfaces for the cascade work of the two scanning detection systems.

The utility model has the advantages that:

1. the utility model provides a multi-way switching value scanning detecting system synthesizes and realizes multi-way switching value scanning detection, realizes detecting in a flexible way, reliably, the way is many and small, with low costs, transfer distance good effect such as far away.

2. The utility model provides a multi-way switching value scanning detecting system, it passes through input filtering, isolation, shaping circuit and output are kept apart, drive circuit, guarantee that detection control system's input, output signal are complete, reliable.

3. The utility model provides a multi-way switching value scanning detecting system, it passes through detection control unit scans the detection mode with the mode control of software programming to show the testing result, send PLC or upper computer with the mode of communication with the testing result simultaneously and carry out monitor control. The method realizes row-column scanning detection control by using ingenious software programming, and detects switching value signals with a large number of paths by using fewer hardware interfaces.

4. The utility model provides a multichannel switching value scanning detecting system, it passes through two way RS485 communication circuit provide scanning detecting system and PLC's communication interface respectively to and two communication interface that scanning detecting system cascades work. The system adopts the RS485 bus as a switching value signal input channel, so that on one hand, the differential communication mode of the RS485 bus can inhibit external interference signals and improve the transmission quality; on the other hand, the switching value signal is transmitted by a low-frequency signal, so that the transmission distance of the switching value signal can be greatly increased under the same condition. Moreover, the cascade operation mode of the two detection systems can multiply the number of detected switching value circuits.

5. The utility model provides a multichannel switching value scanning detecting system, but 2 sets of system simultaneous workings realize the monitor control to 384 ways switching value, and 3 sets of system simultaneous workings realize monitor control etc. to 768 ways switching value.

Drawings

Fig. 1 is a schematic circuit diagram of the input filtering, isolating and shaping circuit of the present invention.

Fig. 2 is a schematic circuit diagram of the output isolation and driving circuit of the present invention.

Fig. 3 is a schematic circuit diagram of the detection control unit of the present invention.

Fig. 4 is a schematic circuit diagram of the switching value position display circuit of the present invention.

Fig. 5 is a schematic circuit diagram of the RS232 serial communication circuit of the present invention.

Fig. 6 is the circuit schematic diagram of two way RS485 communication circuit.

Fig. 7 is a schematic diagram of the wire frame of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 7, the utility model provides a multichannel switching value scanning detecting system, including detecting the control unit 3, detecting the control unit 3 and input filter, keep apart, shaping circuit and 1 output are kept apart, drive circuit 2 is connected, make the input, the delivery outlet works with the scanning mode, the round tracks detect each way switching value state, and handle the testing result, it links to each other with switching value position display circuit 4 to detect the control unit 3 simultaneously, show the ranks position of switching value action, be connected with RS232 serial communication circuit 5, realize the communication function with the host computer, be connected with two way 485 communication circuit 6, realize the communication function with PLC and two detecting system cascade work respectively.

The multi-path switching value scanning detection system can also work by cascading two detection systems to realize the monitoring control of 192 paths of switching values. And 2 sets of systems can work simultaneously to realize monitoring control on 384-path switching values, 3 sets of systems work simultaneously to realize monitoring control on 768-path switching values and the like.

Preferably, the input filtering, isolating, shaping circuit 1 and the output isolating, driving circuit 2 provide reliable input and output signals.

Preferably, the detection control unit 3 controls the scanning detection mode in a software programming mode, displays the detection result, and transmits the detection result to the PLC or the host computer in a communication mode for remote monitoring control.

Preferably, the RS232 serial port communication circuit 5 includes an RS232 level conversion circuit and a communication indication circuit, and is configured to provide a communication interface between the scanning detection system and the upper computer, so as to implement a real-time monitoring function for the detection system.

Preferably, the two 485 communication circuits include an RS485 level conversion circuit and a communication indication circuit, and provide communication interfaces of the scanning detection system and the PLC and communication interfaces of the two scanning detection systems in cascade connection respectively.

As shown in FIG. 1, X1 is one of 8 input signals, R in the input filtering, isolating and shaping circuit 1₂₃、C₂₃An RC filter circuit is constructed. U shape₁₃The optical coupler is used for performing photoelectric isolation on an input signal so as to reduce interference and protect an input interface. U shape_2CThe Schmitt trigger further shapes the input signal to improve the quality of the input signal. The multi-way switching value scanning detection system has 8 detection input ports in total, so that 8 circuits are provided.

In addition to the above, in another embodiment, in the output isolation and driving circuit 2, as shown in fig. 2, U₁₀The optical coupler is used for carrying out photoelectric isolation on output signals and protecting an output interface. VT₁₁The power amplifier is a triode and is used for amplifying the input power of the output signal and improving the anti-interference capability of the output signal. The multi-way switching value scanning detection system has 12 detection output ports in total, so that 12 circuits are provided.

On the basis of the above situation, in another embodiment, the detection control unit 3 includes a digital programmable device STC12C5a60S2, a power-on reset circuit, a clock circuit, and a power filter circuit. As shown in FIG. 3, U₉The digital programmable device STC12C5A60S2 can complete the functions of detection scanning control, position display, serial port communication, RS485 communication and the like in a software programming mode. S₆、R₂₂、C₁₇Forming a key reset circuit and a power-on reset, power-on instant C₁₇By R₂₂Charging, RST is high level, and is pulled down after charging is finished, so that the power-on reset function is realized, and the key S₆And the RST is pulled up when being pressed down, so that the key reset function is realized. Y is₂、C₁₈、C₂₁Form a clock circuit for providing oscillation frequency for STC12C5A60S2 work, wherein Y₂Is a passive crystal oscillator, C₁₈、C₂₁Is a starting oscillation capacitor. C₁₉、C₂₀Forming a power supply filter circuit.

On the basis of the above-described situation, in still another embodiment, the position display circuit 4 includes a driving unit and a display unit. As shown in fig. 4, VT₂、VT₄、VT₅And a triode is driven by the public end of the nixie tube, and the display driving current is increased. DS (direct sequence)₁The display device is a three-position common-sun nixie tube, the first two left bits are used for displaying column numbers (1-12) in a column-row matrix where the action switching values are located, the third left bit is used for displaying the column numbers (1-8) in the column-row matrix where the action switching values are located, and the position of the action switching values in the column-row matrix can be determined by observing display numbers of the three-position nixie tube.

In another embodiment based on the above situation, in the RS232 serial port communication circuit 5, as shown in fig. 5, U₆The chip is a MAX232 level conversion chip, and mainly realizes the conversion from a TTL level to an RS232 level, thereby realizing the communication function of STC12C5A60S2 and a computer. VL₉、VL₁₀For communication indicator lamps, RXD is low when data is received, VL₁₀The indicator light is on; when transmitting data, TXD is low, VL9₉The indicator light is on. CN4 is 9 pin serial ports and connects with the computer through a serial port line, realizes the function of monitoring the state of the scanning detection system.

Based on the above situation, in another embodiment, in the two-way RS485 communication circuit 6, as shown in fig. 6, U₅The conversion from TTL level to RS485 level is mainly realized for MAX485 level conversion chips, so that the communication function of STC12C5A60S2, PLC and a cascade detection working mode is realized. VL₃、VL₅For communication indicator lights, when data is received, RXD2 is low, VL₅The indicator light is on; when transmitting data, TXD2 is low, VL₃The indicator light is on. CN3 is a 9-pin serial port connector, and can be connected to a PLC through a 485 bus or another cascade scanning detection system. The multi-path switching value scanning detection system is provided with two RS485 communication circuits, one RS485 communication circuit is used for being connected with a PLC, and the other RS485 communication circuit is used for being connected with the other scanning detection system to form a cascade working mode, so that 2 circuits are provided.

The detection system has 8 input ports and 12 output ports, works in a row-column scanning mode, can detect 96 switching values, displays a detection result, and simultaneously can transmit the detection result to a PLC or an upper computer in a communication mode for monitoring control. And two detection systems can also work in a cascade mode to realize the monitoring control of the 192-path switching value. And 2 sets of systems can work simultaneously to realize monitoring control on 384-path switching values, 3 sets of systems work simultaneously to realize monitoring control on 768-path switching values and the like. In addition, the detection system adopts the RS485 bus as a switching value signal input channel, so that on one hand, the differential communication mode of the RS485 bus can inhibit external interference signals and improve the transmission quality; on the other hand, the switching value signal is transmitted by a low-frequency signal, so that the transmission distance of the switching value signal can be greatly increased under the same condition. By adding photoelectric isolation equipment at the input equipment end and adopting corresponding anti-jitter measures and the like on software, the communication accuracy can be completely ensured.

Claims

1. The utility model provides a multichannel switching value scanning detecting system, characterized in that, including detection control unit (3), detection control unit (3) and input filtering, keep apart, shaping circuit (1) and output are kept apart, drive circuit (2) are connected, make input, the delivery outlet work with the scanning mode, the round tracks detects each way switching value state, and handle the testing result, detection control unit (3) link to each other with switching value position display circuit (4) simultaneously, the rank position of the action of display switching value, be connected with RS232 serial communication circuit (5), realize with the communication function of host computer, can transmit the testing result to the computer, realize remote monitoring, still be connected with RS485 two way communication circuit (6), realize respectively with PLC and two detection system cascade work's communication function.

2. A multiple switching value scanning detection system according to claim 1, wherein said output isolation and driving circuit (2) isolates and amplifies the output signal of the detection control unit.

3. A multiple switching value scanning detection system according to claim 1, wherein the detection control unit (3) controls the scanning detection mode, displays the detection result, and transmits the detection result to the PLC or the host computer for monitoring control in a communication mode.

4. The multi-way switching value scanning detection system according to claim 1, wherein the RS232 serial port communication circuit (5) comprises an RS232 level conversion circuit and a communication indication circuit, and is used for providing a communication interface between the scanning detection system and the host computer to realize real-time monitoring of the detection result of the scanning system.

5. The system according to claim 1, wherein the two RS485 communication circuits comprise an RS485 level conversion circuit and a communication indication circuit, which respectively provide communication interfaces of the scanning detection system and the PLC, and a communication interface for cascade operation of the two scanning detection systems.