CN212341697U - Signal source simulation device and system - Google Patents
Signal source simulation device and system Download PDFInfo
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- CN212341697U CN212341697U CN202022614781.7U CN202022614781U CN212341697U CN 212341697 U CN212341697 U CN 212341697U CN 202022614781 U CN202022614781 U CN 202022614781U CN 212341697 U CN212341697 U CN 212341697U
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Abstract
The utility model belongs to the technical field of the simulation control, a signal source simulation device and system is disclosed, include: the signal output equipment is in communication connection with the control equipment in an uplink mode; the signal output equipment comprises an isolation power supply circuit, a DAC output circuit, a passive current output circuit, an output protection circuit and an output signal switching circuit; the isolation power supply circuit is respectively and electrically connected with the DAC output circuit, the passive current output circuit, the output protection circuit and the output signal switching circuit; the DAC output circuit and the passive current output circuit are respectively electrically connected with the first end of the output protection circuit, and the second end of the output protection circuit is electrically connected with the signal switching circuit. The utility model can meet the output requirements of various signals of voltage signals, active current signals and passive current signals; the signal simulation of various temperature sensors can be realized by combining the control equipment with the signal output equipment.
Description
Technical Field
The utility model belongs to the technical field of the simulation control, concretely relates to signal source simulation device and system.
Background
The signal acquisition equipment is integrated in a common industrial control system such as a Distributed Control System (DCS), a Programmable Logic Controller (PLC) and the like. When industrial control systems such as DCS and PLC carry out system-level simulation test verification and module-level test verification, various signal source devices are required to provide automatically-controllable signal input.
In a traditional mode, the signal acquisition device is used for detecting the temperature of industrial equipment on a reactor site in an industrial system, and then further detecting and analyzing the signal of a temperature sensor. However, this approach does not allow for factory variation of field device temperature and therefore does not allow for application testing of the signal acquisition device.
With the development of the technology, a simulation device capable of simulating a signal source appears, and the existing simulation device adopts the following technical scheme: a single signal source is adopted to output signals, however, the simulation requirements of various types of signal sources cannot be realized by the method; in addition, the signal source and the conditioning circuit are separately designed, and a calibration mode of two-stage calibration is adopted, that is, the signal source and the conditioning module are separately calibrated, however, the conditioning module in the calibration mode can only be manually calibrated, and is easily influenced by the environment, so that the stability is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a signal source simulation device and system for it is single to solve simulation device's signal source output signal among the prior art, and the output signal application test that can't satisfy multiple type signal source and its relatively poor technical problem of calibration mode effect.
In order to achieve the above object, the utility model adopts the following technical scheme:
a signal source emulation device, the device comprising: the signal output equipment is in communication connection with the control equipment in an uplink mode; the signal output equipment comprises an isolation power supply circuit, a DAC output circuit, a passive current output circuit, an active current output circuit, a voltage output circuit, an output protection circuit and an output signal switching circuit; the isolation power supply circuit is respectively and electrically connected with the DAC output circuit, the passive current output circuit, the active current output circuit, the voltage output circuit, the output protection circuit and the output signal switching circuit; the DAC output circuit and the passive current output circuit are respectively electrically connected with the first end of the output protection circuit, and the second end of the output protection circuit is electrically connected with the signal switching circuit.
Further, the signal output apparatus further includes: and the digital isolation circuit is electrically connected with the isolation power supply circuit and the DAC output circuit respectively.
Furthermore, the signal source simulation device further comprises a channel diagnosis module, and the channel diagnosis module is electrically connected with the isolation power supply circuit, the DAC output circuit and the passive current output circuit respectively.
Further, the passive current output circuit includes: the output protection circuit is electrically connected with the sampling resistor, the I/O port of the transmitter chip is electrically connected with the output protection circuit and the signal switching circuit respectively, and the V + port, the B port and the E port of the transmitter chip are electrically connected with the output protection circuit respectively.
Furthermore, the output protection circuit comprises a voltage protection circuit, an active current protection circuit and a passive current protection circuit, the voltage protection circuit and the active current protection circuit are respectively electrically connected with the DAC output circuit, and the passive current protection circuit is electrically connected with the passive current output circuit.
Furthermore, the control device comprises a micro control unit and a human-computer interaction interface, the micro control unit is an MCU or an FPGA, the micro control unit comprises a memory and a processor, and the memory and the processor are in communication connection with the human-computer interaction interface; the processor is also in communication with the signal output device.
Further, the memory comprises a ROM memory and a RAM memory, wherein the ROM memory is configured with a score table of the voltage signal, calibration parameters and software codes, and the score table, the calibration parameters and the software codes are automatically transmitted to the RAM memory when the system is powered on.
Further, the simulation apparatus further includes a calibration unit, the calibration unit includes a precision detection device, and the calibration unit generates a calibration table through the software code, the human-computer interface, and the precision detection device, where the calibration table is stored in the ROM memory.
Furthermore, the signal output device is electrically connected with a channel input interface of an external signal acquisition device in a downlink manner.
The utility model also provides a signal source simulation system, including a plurality of as above a signal source simulation device, it is a plurality of signal source simulation device's signal output equipment sharing integrated circuit board backplate or a plurality of signal output equipment's quick-witted case sharing synchronizing cable, it is a plurality of carry out synchronous trigger control through synchronizing circuit between the signal output equipment.
The utility model has the advantages that: by arranging the DAC output circuit and the passive signal output circuit, the output requirements of various types of signals such as voltage signals, active current signals and passive current signals can be met; meanwhile, an output protection circuit is respectively connected to the DAC output circuit and the passive signal output end, so that the circuit is prevented from generating circuit problems such as short circuit, overcurrent and overvoltage; in addition, an output signal switching circuit is also arranged, and a corresponding signal type can be output according to the requirement of external signal acquisition equipment; the signal output equipment can be calibrated in a mode of combining the precision detection equipment with the control equipment and the signal output equipment, and the calibration mode is simple and high in accuracy; the signal simulation of various types of temperature sensors can be realized by combining the control equipment with the signal output equipment.
Drawings
Fig. 1 is a schematic structural diagram of a signal source simulation apparatus in an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a signal output apparatus in an embodiment of the present invention;
fig. 3 is a circuit configuration diagram of a DAC output circuit in an embodiment of the present invention;
fig. 4 is a circuit configuration diagram of a passive current output circuit in an embodiment of the present invention;
fig. 5 is a circuit configuration diagram of an output protection circuit in an embodiment of the present invention;
fig. 6 is a circuit configuration diagram of a signal switching circuit in an embodiment of the present invention;
fig. 7 is a circuit configuration diagram of a digital isolation circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Referring to fig. 1-7 in combination, a signal source simulation apparatus includes: the signal output equipment is in communication connection with the control equipment in an uplink mode; the signal output equipment comprises an isolation power supply circuit, a DAC output circuit, a passive current output circuit, an output protection circuit and an output signal switching circuit; the isolation power supply circuit is respectively and electrically connected with the DAC output circuit, the passive current output circuit, the output protection circuit and the output signal switching circuit; the DAC output circuit and the passive current output circuit are respectively electrically connected with the first end of the output protection circuit, and the second end of the output protection circuit is electrically connected with the signal switching circuit. Preferably, the signal output apparatus further includes: and the digital isolation circuit is electrically connected with the isolation power supply circuit and the DAC output circuit respectively.
In the embodiment of the present invention, preferably, the signal output device is electrically connected to the channel input interface of the external signal collecting device. Preferably, the connection mode of the output end of the signal output device comprises one or more of a two-wire system, a three-wire system and a four-wire system. When the access mode of the output end is a two-wire system, the port is accessed to V +, V-or I + or I-; when the access mode of the output end is a three-wire system, the port is accessed into V +, V-and I-; when the access mode of the output end is a four-wire system, the port is accessed to V +, V-, I + and I-.
In the embodiment of the present invention, please refer to fig. 3, which is a circuit structure diagram of the DAC output circuit in the embodiment of the present invention, the DAC output circuit is used to convert digital signals into analog signals, after the DAC chip conversion, voltage signals or/and active current signals can be output, and the output signals support different range selections, for example: the voltage is +/-10V, 0-5V, 4-20mA, 0-20mA, 0-24mA and the like, and can be set according to requirements without limitation.
In the embodiment of the present invention, please refer to fig. 4, which is a circuit structure diagram of the passive current input circuit in the embodiment of the present invention, the passive current output circuit includes: the output protection circuit is electrically connected with the sampling resistor, the I/O port of the transmitter chip is electrically connected with the output protection circuit and the signal switching circuit respectively, and the V + port, the B port and the E port of the transmitter chip are electrically connected with the output protection circuit respectively. The passive current output circuit is used for converting the voltage signal into a passive current signal and outputting the passive current signal to external signal acquisition equipment, and multiple signal output types are provided for the external signal acquisition equipment.
In the embodiment of the present invention, please refer to fig. 5, for the embodiment of the present invention provides a circuit structure diagram of an output protection circuit, the output protection circuit includes a voltage protection circuit, an active current protection circuit and a passive current protection circuit, the voltage protection circuit and the active current protection circuit respectively with the DAC output circuit is electrically connected, the passive current protection circuit with the passive current output circuit is electrically connected. The output protection circuit is used for providing protection functions of short circuit, overcurrent, overvoltage and the like of the output circuit and simultaneously providing protection functions when the output end and the receiving end are in electrical conflict.
In the embodiment of the present invention, please refer to fig. 6, which is the embodiment of the present invention, wherein the signal switching circuit comprises a switching circuit supporting voltage output, a switching circuit supporting active current output, and a switching circuit supporting passive current output, and is connected to the voltage output terminal, the active current output terminal, and the passive current output terminal respectively. The signal acquisition device is used for providing corresponding types of output signals according to the requirements of external signal acquisition equipment.
In the embodiment of the present invention, please refer to fig. 7, which is a circuit structure diagram of the digital isolation circuit in the embodiment of the present invention, the digital isolation circuit is used to provide the isolation path of the analog quantity and the digital quantity, so as to prevent the mutual interference between the channels.
In the embodiment of the present invention, the control device includes a micro control unit and a human-computer interaction interface, the micro control unit is an MCU or an FPGA, the micro control unit includes a memory and a processor, and the memory and the processor are in communication connection with the human-computer interaction interface; the processor is also in communication with the signal output device. Preferably, the memory comprises a ROM memory and a RAM memory, the ROM memory is configured with a score table of the voltage signal, calibration parameters and software codes, and the score table, the calibration parameters and the software codes are automatically transmitted to the RAM memory when the system is powered on. Preferably, the simulation apparatus further includes a calibration unit, the calibration unit includes a precision detection device, and the calibration unit generates a calibration table through the software code, the human-computer interface, and the precision detection device, where the calibration table is stored in the ROM memory.
The embodiment of the utility model provides an in, in order to satisfy various output signal's high accuracy simulation, need calibrate output signal to establish the calibration table. The method mainly comprises the steps of calibrating the voltage signals and establishing a voltage signal calibration table.
As an achievable mode of the utility model, after treating the voltage signal of output and calibrating, further simulate the temperature sensor of different grade type, for example changer, thermocouple, thermal resistance etc.. The thermocouple is simulated by taking an example, the voltage ranges are between-50 mV and 75mV, so in order to be compatible with the signal types, the system is specially designed for the thermocouple output signal types to be voltage, different types of thermocouples (K, E, S, N, T, B, R, J) have different division tables, the division tables mainly comprise voltage values corresponding to different temperatures, the output voltage ranges are between-50 mV and 75mV in the temperature measuring ranges of the various types of thermocouples, in order to realize the thermocouple simulation, the division table management is needed to be carried out on the various types of thermocouples, a ROM (read only memory) is specially designed for the hardware to be used for solidifying the division tables and calibration parameters of the various types, and meanwhile, in order to accelerate the efficiency of searching the division tables and calculating the calibration parameters, the RAM (random access memory) is designed for the. After the system is powered on, the ROM data is automatically copied to the RAM. The specific simulation process is as follows:
1. setting a simulated thermocouple type on a human-computer interaction interface by a user: type;
2. setting simulated thermocouple temperature on a human-computer interaction interface by a user: temp;
3. the control equipment calls a corresponding graduation table according to the Type and the Temp, and searches a temperature interval ([ Tm, Tm +1]) corresponding to the Temp under the graduation mark and a voltage range [ Vm, Vm +1] corresponding to the interval;
4. calculating the actual voltage value of Temp by a linear algorithm in combination with Temp, [ Tm, Tm +1], [ Vm, Vm +1 ]: vtemp;
5. and looking up a calibration table, and finding and outputting the DAC control value closest to the Vtemp voltage.
In the embodiment of the present invention, preferably, the signal source simulation apparatus further includes a channel diagnosis module, the channel diagnosis module is respectively connected to the isolation power circuit, the DAC output circuit and the passive current output circuit. Specifically, the channel diagnosis module detects channel output, and mainly comprises functions of power supply diagnosis, output diagnosis and the like. Specifically, the power supply diagnosis includes: monitoring the overvoltage and undervoltage of the isolation power supply voltage of each channel to ensure that a power supply system of each channel is normal, and immediately realizing channel fault alarm when the voltage exceeds a relevant threshold value; the output diagnostics include: the channel output state is mainly judged through a Fault pin of a DAC (digital-to-analog converter), such as channel open circuit in a current output mode, channel short circuit in a voltage output mode and the like; when the Fault pin is high, the channel is abnormal, and then specific channel abnormal information can be acquired in detail through a DAC command.
Example two
The embodiment of the utility model provides a signal source simulation system is still provided, including a plurality of as above a signal source simulation device, it is a plurality of signal source simulation device's signal output equipment sharing integrated circuit board backplate or a plurality of signal output equipment's quick-witted case sharing synchronizing cable, it is a plurality of carry out synchronous trigger control through synchronizing circuit between the signal output equipment.
The signal source simulation system can be used for simultaneous simulation and simulation control of multiple channels, and is realized by the following principle through the hard synchronization function between the plates:
1. the board cards share the same synchronous cable of the back board or the chassis, and all the board cards can receive synchronous signals sent by the master control card at the same time;
2. setting channel output as a synchronous signal trigger output mode;
3. setting expected values of all channels;
4. and the master control outputs a synchronous signal to trigger all the board cards set to be in a synchronous output mode to output.
The synchronous circuit of each channel adopts a 1010M high-speed isolation optocoupler design, and the synchronous error is less than 1 us.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (10)
1. A signal source emulation device, comprising: the signal output equipment is in communication connection with the control equipment in an uplink mode; the signal output equipment comprises an isolation power supply circuit, a DAC output circuit, a passive current output circuit, an output protection circuit and an output signal switching circuit; the isolation power supply circuit is respectively and electrically connected with the DAC output circuit, the passive current output circuit, the output protection circuit and the output signal switching circuit; the DAC output circuit and the passive current output circuit are respectively electrically connected with the first end of the output protection circuit, and the second end of the output protection circuit is electrically connected with the signal switching circuit.
2. The signal source simulation apparatus according to claim 1, wherein the signal output device further comprises: and the digital isolation circuit is electrically connected with the isolation power supply circuit and the DAC output circuit respectively.
3. The signal source simulation apparatus of claim 2, further comprising a channel diagnosis module electrically connected to the isolated power supply circuit, the DAC output circuit, and the passive current output circuit, respectively.
4. The signal source simulation apparatus of claim 1, wherein the passive current output circuit comprises: the output protection circuit is electrically connected with the sampling resistor, the I/O port of the transmitter chip is electrically connected with the output protection circuit and the signal switching circuit respectively, and the V + port, the B port and the E port of the transmitter chip are electrically connected with the output protection circuit respectively.
5. The signal source simulation apparatus of claim 1, wherein the output protection circuit comprises a voltage protection circuit, an active current protection circuit and a passive current protection circuit, the voltage protection circuit and the active current protection circuit are respectively electrically connected to the DAC output circuit, and the passive current protection circuit is electrically connected to the passive current output circuit.
6. The signal source simulation device according to claim 1, wherein the control device comprises a micro control unit and a human-computer interaction interface, the micro control unit is an MCU or an FPGA, the micro control unit comprises a memory and a processor, and the memory and the processor are in communication connection with the human-computer interaction interface; the processor is also in communication with the signal output device.
7. The signal source simulation apparatus according to claim 6, wherein the memory comprises a ROM memory and a RAM memory, the ROM memory is configured with a score table of the voltage signal, a calibration parameter and a software code, and the score table, the calibration parameter and the software code are automatically transferred to the RAM memory when the system is powered on.
8. The signal source simulation apparatus according to claim 7, further comprising a calibration unit, wherein the calibration unit comprises a precision detection device, and the calibration unit generates a calibration table through the software code, the human-computer interface and the precision detection device, and the calibration table is stored in the ROM memory.
9. The signal source simulation apparatus according to any one of claims 1 to 8, wherein the signal output device is electrically connected downstream to the channel input interface of the external signal acquisition device.
10. A signal source simulation system, comprising a plurality of signal source simulation apparatuses according to claim 1, wherein signal output devices of the signal source simulation apparatuses share a board backplane or a synchronous cable shared by a plurality of signal output devices, and a synchronous trigger control is performed among the signal output devices through a synchronous circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022614781.7U CN212341697U (en) | 2020-11-12 | 2020-11-12 | Signal source simulation device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022614781.7U CN212341697U (en) | 2020-11-12 | 2020-11-12 | Signal source simulation device and system |
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| CN212341697U true CN212341697U (en) | 2021-01-12 |
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