CN204612819U - Functional safety temperature transmitter - Google Patents
Functional safety temperature transmitter Download PDFInfo
- Publication number
- CN204612819U CN204612819U CN201420860896.6U CN201420860896U CN204612819U CN 204612819 U CN204612819 U CN 204612819U CN 201420860896 U CN201420860896 U CN 201420860896U CN 204612819 U CN204612819 U CN 204612819U
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- module
- chip microcomputer
- functional safety
- temperature transmitter
- safety temperature
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- 238000003745 diagnosis Methods 0.000 description 11
- 238000005070 sampling Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 101000880160 Streptomyces rochei Subtilisin inhibitor-like protein 2 Proteins 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011058 failure modes and effects analysis Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
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Abstract
The utility model discloses a kind of functional safety temperature transmitter, relate to transmitter field, comprise: a single-chip microcomputer, one signal processing circuit is connected with a main A/D that samples, described main sampling A/D is connected with described single-chip microcomputer, described single-chip microcomputer is also connected with a D/A module, described D/A module is connected with a current output module; One analog switch and treatment circuit, diagnose A/D to be serially connected between described D/A module and described single-chip microcomputer, and described diagnosis A/D is connected with described signal processing circuit simultaneously; During one band, window is opened house dog and is connected between described single-chip microcomputer and current output module.The utility model is connected with single-chip microcomputer company and transmitter Secure execution part by window house dog during band, analog switch and treatment circuit, diagnosis A/D, functional safety temperature transmitter can be taken urgent measure to process units or the contingent danger of equipment, and the situation continuing to worsen is responded in time, make it enter a predefined emergency operating mode.
Description
Technical field
The utility model relates to a kind of transmitter, particularly relates to a kind of functional safety temperature transmitter.
Background technology
2000, the promulgation of IEC61508.1-7 " functional safety of electrical/electronic/programmable electronic safety-related systems " standard indicated that functional safety enters practical stage as independently safety discipline.
Compared to general industrial instrument, functional safety temperature transmitter has following essential characteristic:
1, certain safety integrity levels
Standard based on IEC61508, take into full account the general safety life cycle of safety instrumented systems, propose the general safety life cycle of assessment safety instrumented systems, propose the method for safety integrity level SIL (safety integrity level) of assessment safety instrumented systems, the instrument that specification uses for the functional safety that realizes necessity and measure.The design and development process of functional safety temperature transmitter must follow IEC61508, and is assessed and certification by the functional safety of independent agency, obtains certificate of certification, could apply in industry spot.
2, comprehensive self-diagnosis of trouble cutting capacity
The safety integrity of functional safety temperature transmitter requires also to comprise the requirement of requirement and the system failure control avoiding losing efficacy, and meanwhile, all parts of construction system all needs clear failure diagnostic measures and the behavior after losing efficacy.Entire system for SIL2 grade functional safety temperature transmitter diagnoses coverage rate up to more than 90%.Hardware has height reliability, can bear most of environmental stress, as on-the-spot electromagnetic interference (EMI) etc., thus is better applied to various industrial environment.
3, FMEA assessment
When functional safety temperature transmitter is developed, FMEA analysis must be carried out one by one to all electronic devices and components used, clear and definite often kind of failure mode, failure effect and fault diagnosis measure, and reprocess parts statistics or component failure rate handbook in conjunction with scene, calculate various dominant/recessive, safety/dangerous crash rate.These data are bases of the safety integrity level correlation parameter such as computationally secure inefficacy mark SFF, fault diagnosis coverage rate DC, average probability of failure on demand PFD.
Abroad, especially European Union, comparatively deep to the research of functional safety, and also the product obtaining safety certification gets more and more, and scope is also progressively expanding.In China, functional safety is also a name word concept, although have certain popularization at industrial control field, the electric meter of domestic production obtains the also little of functional safety certification.
Utility model content
The utility model discloses a kind of functional safety temperature transmitter, the problem of some security level required high field conjunction cannot be applied in order to solve Intellectual Thermal Transmitter in prior art.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
A kind of functional safety temperature transmitter, wherein, comprising: a single-chip microcomputer, one signal processing circuit is connected with a main A/D that samples, described main sampling A/D is connected with described single-chip microcomputer, and described single-chip microcomputer is also connected with a D/A module, described D/A module is connected with a current output module; One analog switch and treatment circuit, diagnose A/D to be serially connected between described D/A module and described single-chip microcomputer, and described diagnosis A/D is connected with described signal processing circuit simultaneously; During one band, window is opened house dog and is connected between described single-chip microcomputer and current output module.
Functional safety temperature transmitter as above, wherein, described single-chip microcomputer is connected with a display device, a display lamp, a button.
Functional safety temperature transmitter as above, wherein, described signal processing circuit comprises: RC filter network, EMC protection circuit, TC sensor, RTD input selection network.
Functional safety temperature transmitter as above, wherein, described main sampling A/D comprises: 24 A/D, and described main sampling A/D also comprises: two-way exciting current.
Functional safety temperature transmitter as above, wherein, described single-chip microcomputer adopts 16 low-power scms.
Functional safety temperature transmitter as above, wherein, has in described D/A module: power module, base modules.
Functional safety temperature transmitter as above, wherein, described current output module has the anti-interference protection module of an EMC.
Functional safety temperature transmitter as above, wherein, described analog switch treatment circuit comprises: sensor broken string/short circuit diagnostic module, 3.3V supply voltage overvoltage/under-voltage protective module.
Functional safety temperature transmitter as above, wherein, described diagnosis A/D comprises: main sampling A/D fault diagnosis module, D/A fault diagnosis module, TC cold junction short circuit/open circuit/drift diagnostic module, RTD exciting current drift diagnostic module.
Functional safety temperature transmitter as above, wherein, during described band, window house dog comprises: MCU is without interruption/interrupt module, 3.3V power fail module, 4 ~ 20mA electric current export malfunctioning module continuously.
In sum, owing to have employed technique scheme, the utility model solves the problem that Intellectual Thermal Transmitter in prior art cannot be applied in the conjunction of some security level required high field, the utility model is by window house dog during band, analog switch and treatment circuit, diagnosis A/D connects with single-chip microcomputer and transmitter Secure execution part is connected, functional safety temperature transmitter can be taken urgent measure to process units or the contingent danger of equipment, and the situation continuing to worsen is responded in time, it is made to enter a predefined emergency operating mode, thus make danger and loss drop to minimum level, ensure to produce, equipment, environment and personal security.The utility model meets the SIL2 safe class requirement specified in IEC61508 standard, design based on the guilding principle of fault-safety principle, even if also can output safety electric current or power-off when itself fail, system be made to remain on safe condition.This technology is particularly suitable for requiring higher industrial environment in some safe classes.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model functional safety temperature transmitter.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further:
Fig. 1 is the structured flowchart of the utility model functional safety temperature transmitter, refer to Fig. 1, a kind of functional safety temperature transmitter, wherein, comprise: single-chip microcomputer 11, signal processing circuit 12 is connected with a main A/D13 that samples, and main sampling A/D13 is connected with single-chip microcomputer 11, single-chip microcomputer 11 is also connected with D/A module 14, a D/A module 14 to be connected with a current output module 15; One analog switch and treatment circuit 21, diagnose A/D22 to be serially connected between D/A module 14 and single-chip microcomputer 11, and diagnosis A/D22 is connected with signal processing circuit 12 simultaneously; During one band, window is opened house dog 23 and is connected between single-chip microcomputer 11 and current output module 15.
Single-chip microcomputer 11 of the present utility model is connected with a display device, a display lamp, a button 33.
Further, display device comprises configuration interface 31, and display lamp is LCD32.
Signal processing circuit 12 of the present utility model comprises: RC filter network, EMC protection circuit, TC sensor, RTD input selection network; wherein; RC filter network realizes the signal filtering of mv signal; EMC protection circuit improves the EMC antijamming capability of Sensor input channel; TC sensor/RTD input selection network is then used for the input mode of sensors configured; specifically comprise: thermopair TC inputs, RTD 2 line system inputs, and RTD 3 line system inputs.
Main sampling A/D13 of the present utility model comprises: 24 A/D, and main sampling A/D also comprises: two-way exciting current, and two-way exciting current is used to provide the exciting current required for RTD 2 line system/RTD 3 line system.Main sampling A/D is mainly used to pick-up transducers signal and analog quantity mv value is converted to digital quantity and sends single-chip microcomputer (MCU) to through SPI communication.
Single-chip microcomputer 11 of the present utility model adopts 16 low-power scms.Single-chip microcomputer of the present utility model mainly comprises security function and diagnostic function:
Security function: the digital quantity that A/D changes is converted to temperature signal according to different sensor types.And convert temperature signal to 4 ~ 20mA current signal.
Diagnostic function: RAM diagnoses, and ROM diagnoses, and EEPROM diagnoses, stack diagnostic, and PC pointer is diagnosed, instruction diagnostic etc.According to assessment, MCU built in diagnostics method can reach more than 90% and diagnose coverage rate.
Have in D/A module 14 of the present utility model: power module, base modules, power module mainly by the 3.3V power supply of 24V Power convert required for system to system power supply; Benchmark is used for providing reference voltage to main sampling A/D; The digital quantity that MCU provides by D/A module is converted to analog quantity.
Current output module 15 of the present utility model has the anti-interference protection module of an EMC, and it is analog quantity is converted to 4 ~ 20mA electric current to export that electric current exports, and the anti-interference protection module of EMC provided/under-voltage protection, anti-reverse protection, the anti-interference protection of EMC.
Analog switch treatment circuit 21 of the present utility model comprises: sensor broken string/short circuit diagnostic module, 3.3V supply voltage overvoltage/under-voltage protective module.
Diagnosis A/D22 of the present utility model comprises: main sampling A/D fault diagnosis module, D/A fault diagnosis module, TC cold junction short circuit/open circuit/drift diagnostic module, RTD exciting current drift diagnostic module.
During band of the present utility model, window house dog 23 comprises: MCU is without interruption/interrupt module, 3.3V power fail module, 4 ~ 20mA electric current export malfunctioning module continuously.Further, MCU of the present utility model can also have program program sequentially cannot perform diagnostic function without interruption/continuous interrupt module.
Functional safety temperature transmitter disclosed in the utility model is the first product by the certification of TUV functional safety in the whole nation, has positive role safely for the national economic development of China and national strategy.
Claims (10)
1. a functional safety temperature transmitter, is characterized in that, comprising: a single-chip microcomputer, one signal processing circuit is connected with a main A/D that samples, described main sampling A/D is connected with described single-chip microcomputer, and described single-chip microcomputer is also connected with a D/A module, described D/A module is connected with a current output module; One analog switch and treatment circuit, diagnose A/D to be serially connected between described D/A module and described single-chip microcomputer, and described diagnosis A/D is connected with described signal processing circuit simultaneously; During one band, window is opened house dog and is connected between described single-chip microcomputer and current output module.
2. functional safety temperature transmitter according to claim 1, is characterized in that, described single-chip microcomputer is connected with a display device, a display lamp, a button.
3. functional safety temperature transmitter according to claim 1, is characterized in that, described signal processing circuit comprises: RC filter network, EMC protection circuit, TC sensor, RTD input selection network.
4. functional safety temperature transmitter according to claim 1, is characterized in that, described main sampling A/D comprises: 24 A/D, and described main sampling A/D also comprises: two-way exciting current.
5. functional safety temperature transmitter according to claim 1, is characterized in that, described single-chip microcomputer adopts 16 low-power scms.
6. functional safety temperature transmitter according to claim 1, is characterized in that, has: power module, base modules in described D/A module.
7. functional safety temperature transmitter according to claim 1, is characterized in that, described current output module has the anti-interference protection module of an EMC.
8. functional safety temperature transmitter according to claim 1, is characterized in that, described analog switch treatment circuit comprises: sensor broken string/short circuit diagnostic module, 3.3V supply voltage overvoltage/under-voltage protective module.
9. functional safety temperature transmitter according to claim 1, it is characterized in that, described diagnosis A/D comprises: main sampling A/D fault diagnosis module, D/A fault diagnosis module, TC cold junction short circuit/open circuit/drift diagnostic module, RTD exciting current drift diagnostic module.
10. functional safety temperature transmitter according to claim 1, is characterized in that, during described band, window house dog comprises: MCU is without interruption/interrupt module, 3.3V power fail module, 4 ~ 20mA electric current export malfunctioning module continuously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860896.6U CN204612819U (en) | 2014-12-31 | 2014-12-31 | Functional safety temperature transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860896.6U CN204612819U (en) | 2014-12-31 | 2014-12-31 | Functional safety temperature transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204612819U true CN204612819U (en) | 2015-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420860896.6U Withdrawn - After Issue CN204612819U (en) | 2014-12-31 | 2014-12-31 | Functional safety temperature transmitter |
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| Country | Link |
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| CN (1) | CN204612819U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568195A (en) * | 2014-12-31 | 2015-04-29 | 上海自动化仪表股份有限公司 | Functional safety temperature transmitter |
-
2014
- 2014-12-31 CN CN201420860896.6U patent/CN204612819U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568195A (en) * | 2014-12-31 | 2015-04-29 | 上海自动化仪表股份有限公司 | Functional safety temperature transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150902 Effective date of abandoning: 20180508 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150902 Effective date of abandoning: 20180508 |