CN202632102U - Loop signal safety detector - Google Patents
Loop signal safety detector Download PDFInfo
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- CN202632102U CN202632102U CN 201220309119 CN201220309119U CN202632102U CN 202632102 U CN202632102 U CN 202632102U CN 201220309119 CN201220309119 CN 201220309119 CN 201220309119 U CN201220309119 U CN 201220309119U CN 202632102 U CN202632102 U CN 202632102U
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Abstract
The utility model discloses a loop signal safety detector, which comprises a function selection circuit for automatically selecting a measured type and a range, a signal conversion circuit, a range switching circuit, an analogue/digital (A/D) converter, a singlechip and an information output module, wherein the function selection circuit and the singlechip are connected with the range switching circuit; the function selection circuit is connected with the signal conversion circuit; the signal conversion circuit is connected with the range switching circuit; the range switching circuit is connected with the A/D converter; the A/D converter is connected with the singlechip; and the information output module is connected with the singlechip. The basic state of a loop is judged according to a detected signal value, and the type of the loop and whether a current signal is normal or not are informed to a debugger in a voice prompting way, so that the debugger can conveniently judge the state of the loop, the potential safety hazards of equipment are eliminated, and a good foundation is laid for subsequent loop debugging and system joint debugging.
Description
Technical field
The utility model relates to a kind of electric circuit inspection safety detection device, the loop signal safety detector that the affirmation of signals security is carried out in the particularly a kind of DCS/PLC of being used for control system loop.
Background technology
In the prior art, be widely used in the DCS/PLC automation control system in the industry production devices such as oil, chemical industry, electric power, metallurgy, form by the monitoring loop that computing machine and various detecting unit instrument constitute.Because it is high to constitute the equipment manufacturing cost of these systems, in the process of the new installation of system equipment, debugging, if the device damage accident takes place, except that direct economic loss, reorganizing orders goods produces, and causes construction delay, and its consequence tends to more serious.How in the work progress of system equipment Installation and Debugging, taking effective measures, guarantee the safety of these system equipments in debug process, is the problem that must pay attention to.
In the DCS/PLC automation control system that uses at present; Remove conventional thermal technology's amount, as outside the controlled device, still include voltage, the electric current of power strong power part in the system monitoring scope like temperature, pressure, flow, liquid level, displacement etc.; So that detection signal is of a great variety; Signal voltage is from millivolt to several hectovolts, and the amplitude span is big, and circuit is also complicated.
According to the sequence of construction of present industrial automation control system, behind measuring instrument and the DCS/PLC main process equipment installation in position, carry out the loop and join the school line at the scene.After joining school line completion, external meters and main frame send electricity, carry out the debugging work of system circuit then.In this process, be accomplished to the external meters main frame and send electricity, the step what inspection the loop is not just had again, checks from joining the school line.Because traditional school line just contrasts drawing and checks whether wiring position is wrong, and after forming for system circuit, whether the signal of outside input all in normal scope, but is not that the school line can be judged.When system sent electricity, whether the commissioning staff can't accomplish to know what's what to normal by the signal of external meters input DCS/PLC main frame, wait until that the DCS/PLC main frame send electricity after, on host C RT, observe and occur unusually, just can go to search reason.Because this moment, various detection signals got into system; Once the high voltage of power section goes wrong because of conversion, perhaps, cause high voltage directly to scurry into signalling channel because construction waits other reason; Will cause the DCS/PLC system interface module when powering on, to damage; As far as the thermopair load module, its signal level is the millivolt level especially, as long as tens volts of voltages just maybe be with module damage.So, see that on display when unusual, often consequence can't be retrieved only with line way inspection loop, traditional school.
The utility model content
To the deficiency that exists in the prior art, the purpose of the utility model is to provide a kind of and before sending electricity, can detects loop signal and whether be in the loop signal safety detector in the normal range.
The technical scheme of the utility model is achieved in that
A kind of loop signal safety detector; The function selector circuit, signaling conversion circuit, range switch circuit, A/D converter, single-chip microcomputer, the message output module that comprise measured type of automatic selection and range; The output terminal of said function selector circuit all is connected with the input end of said range switch circuit with the data output end of said single-chip microcomputer; The output terminal of said function selector circuit is connected with the input end of said signaling conversion circuit; The output terminal of said signaling conversion circuit is connected with the input end of said range switch circuit; The output terminal of said range switch circuit is connected with the input end of said A/D converter, and the output terminal of said A/D converter is connected with the data input pin of said single-chip microcomputer, and the data output end of said message output module and said single-chip microcomputer is connected.
Above-mentioned loop signal safety detector; Said signaling conversion circuit comprises current/voltage converter; AC/DC converter and impedance/electric pressure converter; The input end of the input end of the input end of said current/voltage converter, said AC/DC converter, the input end of said impedance/electric pressure converter and said selective circuit of measuring range all is connected with said function selector circuit; The output terminal of said current/voltage converter is connected with the input end of said range switch circuit and the input end of said AC/DC converter respectively, and the output terminal of said AC/DC converter all is connected with the input end of said range switch circuit with the output terminal of said impedance/electric pressure converter.
Above-mentioned loop signal safety detector, said message output module comprises voice module and light-emitting diode display, said voice module is connected with the data output end of said single-chip microcomputer respectively with light-emitting diode display.
Above-mentioned loop signal safety detector, said voice module comprises speech chip and loudspeaker, and the input end of said speech chip is connected with the data output end of said single-chip microcomputer, and said loudspeaker is connected with the output of said speech chip.
Above-mentioned loop signal safety monitoring assembly also comprises power circuit, and said power circuit is connected with said single-chip microcomputer, voice module, A/D converter, range switch circuit and impedance/electric pressure converter respectively.
Above-mentioned loop signal safety detector, said light-emitting diode display are the digital display tubes of four LED.
The beneficial effect of the utility model is: the loop signal safety detector is judged the basic status in loop according to detected signal type and signal value, with the mode of voice suggestion; Inform that which kind of type this loop of commissioning staff is; Whether signal is normal at present, makes things convenient for the commissioning staff to judge this loop state, thoroughly the abatement apparatus potential safety hazard; Be next step loop debugging and system integration and test; Lay a good foundation, the affirmation of signals security is carried out in the DCS/PLC control system loop of energising before the uniting and adjustment, protection system equipment, safety are powered on debugging, assurance construction period and put into production according to plan and have crucial meaning.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model loop signal safety detector.
Embodiment
In conjunction with accompanying drawing the utility model is done further explanation:
A kind of loop signal safety detector; The function selector circuit, signaling conversion circuit, range switch circuit, A/D converter, single-chip microcomputer, the message output module that comprise measured type of automatic selection and range; A/D converter adopts the AD775 modulus conversion chip; Single-chip microcomputer adopts the AT89C55 single-chip microcomputer; The data output end of the output terminal of said function selector circuit and said AT89C55 single-chip microcomputer all is connected with the input end of said range switch circuit; The output terminal of said function selector circuit is connected with the input end of said signaling conversion circuit, and the output terminal of said signaling conversion circuit is connected with the input end of said range switch circuit, and the output terminal of said range switch circuit is connected with the input end of said AD775 modulus conversion chip; The output terminal of said AD775 modulus conversion chip is connected with the data input pin of said AT89C55 single-chip microcomputer, and said message output module is connected with the data output end of said AT89C55 single-chip microcomputer.
Said signaling conversion circuit comprises current/voltage converter; AC/DC converter and impedance/electric pressure converter; The input end of the input end of the input end of said current/voltage converter, said AC/DC converter, the input end of said impedance/electric pressure converter and said selective circuit of measuring range all is connected with said function selector circuit; The output terminal of said current/voltage converter is connected with the input end of said range switch circuit and the input end of said AC/DC converter respectively, and the output terminal of said AC/DC converter all is connected with the input end of said range switch circuit with the output terminal of said impedance/electric pressure converter.
Said message output module comprises voice module and light-emitting diode display, and said voice module is connected with the data output end of said AT89C55 single-chip microcomputer respectively with light-emitting diode display, and said light-emitting diode display is the digital display tubes of four LED.
Said voice module comprises ISD1790 speech chip and loudspeaker, and the input end of said ISD1790 speech chip is connected with the data output end of said AT89C55 single-chip microcomputer, and said loudspeaker is connected with the output of said ISD1790 speech chip.
Also comprise power circuit, said power circuit is connected with impedance/electric pressure converter with said AT89C55 single-chip microcomputer, voice module, AD775 modulus conversion chip, range switch circuit respectively.
The use of loop signal safe monitor:
The external detection instrument power on the back in system circuit input signal, this moment with the loop signal safety detector system circuit is detected.
During measurement function selector circuit according to the signal type in the system circuit to be measured select the signal converter type that will be communicated with; Simultaneously according to the type selecting range switch circuit of signal the signal display type (like display voltage value, current value or resistance value) that will switch to; Signal is input in the AT89C55 single-chip microcomputer through the AD775 modulus conversion chip; The AT89C55 single-chip microcomputer is transferred to a suitable range according to the size control range switch circuit of signal value; The AT89C55 single-chip microcomputer is transferred to light-emitting diode display and voice module with signal message; Demonstrate the signal value size of measurement on the light-emitting diode display, it is whether any measurement loop and the signal value scope in the measured loop of explaining belong in the normal range that voice module is reported tested loop according to the information that receives.
The action situation of loop signal safety detector when below respectively measuring the loop for detection:
When detected signal value below 100 millivolts the time, explain that this loop is that electric thermo-couple temperature is measured the loop, signal is normal, voice suggestion " the thermocouple measurement loop is normal ".
When detected signal value is between 100-200 ohm, explain that this loop is the thermal resistance temperature surveying loop, signal is normal, voice suggestion " it is normal that thermal resistance is measured the loop ".
When detected signal value is between the 1-5 volt, explain that this loop is conventional thermal technology's measurement amount loops such as pressure, liquid level, signal is normal, voice suggestion " the loop input signal is normal ".
When detected signal value is between the 6-500 volt, explain that this loop has high voltage to get into, the loop is undesired, need search reason.Voice suggestion " input signal is undesired, please search reason ".
When detected signal value is 0, voice suggestion " the loop no signal is asked checking loop or searched reason ".This situation shows: this loop of a. possibly be passive input circuit (main frame provides the loop of signal power source), detects no signal voltage and occurs, and explains that it is safe that this loop does not have high voltage, can carry out follow-up debugging work; If b. in the winter time, environment temperature low (near zero degree), in the electric thermo-couple temperature input circuit, thermoelectrical potential is very low, is limited to measuring accuracy, the situation of no signal can occur, is decidable as long as check design drawing.
The foregoing description only be for clearly explain the utility model create done for example, and be not the qualification of the utility model being created embodiment.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.Any conspicuous variation of being extended out within all spirit and principles at the utility model or change still are in the utility model and create among the protection domain of claim.
Claims (6)
1. loop signal safety detector; It is characterized in that; The function selector circuit, signaling conversion circuit, range switch circuit, A/D converter, single-chip microcomputer, the message output module that comprise measured type of automatic selection and range; The output terminal of said function selector circuit all is connected with the input end of said range switch circuit with the data output end of said single-chip microcomputer; The output terminal of said function selector circuit is connected with the input end of said signaling conversion circuit, and the output terminal of said signaling conversion circuit is connected with the input end of said range switch circuit, and the output terminal of said range switch circuit is connected with the input end of said A/D converter; The output terminal of said A/D converter is connected with the data input pin of said single-chip microcomputer, and the data output end of said message output module and said single-chip microcomputer is connected.
2. loop signal safety detector according to claim 1; It is characterized in that; Said signaling conversion circuit comprises current/voltage converter; AC/DC converter and impedance/electric pressure converter; The input end of the input end of the input end of said current/voltage converter, said AC/DC converter, the input end of said impedance/electric pressure converter and said selective circuit of measuring range all is connected with said function selector circuit; The output terminal of said current/voltage converter is connected with the input end of said range switch circuit and the input end of said AC/DC converter respectively, and the output terminal of said AC/DC converter all is connected with the input end of said range switch circuit with the output terminal of said impedance/electric pressure converter.
3. loop signal safety detector according to claim 2 is characterized in that said message output module comprises voice module and light-emitting diode display, and said voice module is connected with the data output end of said single-chip microcomputer respectively with light-emitting diode display.
4. loop signal safety detector according to claim 3; It is characterized in that; Said voice module comprises speech chip and loudspeaker, and the input end of said speech chip is connected with the data output end of said single-chip microcomputer, and said loudspeaker is connected with the output of said speech chip.
5. loop signal safety monitoring assembly according to claim 3 is characterized in that, also comprises power circuit, and said power circuit is connected with said single-chip microcomputer, voice module, A/D converter, range switch circuit and impedance/electric pressure converter respectively.
6. loop signal safety detector according to claim 3 is characterized in that, said light-emitting diode display is the digital display tubes of four LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220309119 CN202632102U (en) | 2012-06-29 | 2012-06-29 | Loop signal safety detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220309119 CN202632102U (en) | 2012-06-29 | 2012-06-29 | Loop signal safety detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202632102U true CN202632102U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220309119 Expired - Fee Related CN202632102U (en) | 2012-06-29 | 2012-06-29 | Loop signal safety detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202632102U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110390954A (en) * | 2019-08-06 | 2019-10-29 | 京东方科技集团股份有限公司 | Method and device for evaluating quality of voice product |
| US20220043045A1 (en) * | 2018-11-30 | 2022-02-10 | Valeo Siemens Eautomotive Germany Gmbh | Monitoring circuit for an interlock system, interlock system, assembly having an interlock system and having a functional unit, and method for operating an interlock system |
-
2012
- 2012-06-29 CN CN 201220309119 patent/CN202632102U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220043045A1 (en) * | 2018-11-30 | 2022-02-10 | Valeo Siemens Eautomotive Germany Gmbh | Monitoring circuit for an interlock system, interlock system, assembly having an interlock system and having a functional unit, and method for operating an interlock system |
| CN110390954A (en) * | 2019-08-06 | 2019-10-29 | 京东方科技集团股份有限公司 | Method and device for evaluating quality of voice product |
| CN110390954B (en) * | 2019-08-06 | 2022-05-13 | 京东方科技集团股份有限公司 | Method and device for evaluating quality of voice product |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20210629 |
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| CF01 | Termination of patent right due to non-payment of annual fee |