CN1932910A - Automation device - Google Patents
Automation device Download PDFInfo
- Publication number
- CN1932910A CN1932910A CNA2006101539240A CN200610153924A CN1932910A CN 1932910 A CN1932910 A CN 1932910A CN A2006101539240 A CNA2006101539240 A CN A2006101539240A CN 200610153924 A CN200610153924 A CN 200610153924A CN 1932910 A CN1932910 A CN 1932910A
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- Prior art keywords
- clock generator
- clock
- automation device
- data
- data bit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention relates to an automation-technical device, wherein a plurality of spatially separate functional units communicate with one another by a common transmission protocol. The device is provided with a micro-controller (110) to which at least a clock generator (120) and a memory unit (150) are assigned, and which is at least connected with a data source (140) used for outputting a data bit stream to be sent. The memory unit (150) stores a continuous sequence of equidistance sample value with a trapezoidal time characteristic which can be called, thereby, the sample value can be outputted by alternately using a first clock generator (112) or a second clock generator (113) according to the data bit stream.
Description
Technical field
The present invention relates to a kind of automation device, wherein a plurality of functional units that spatially separate intercom mutually by means of common transmission protocol.According to the automatic technology function of functional unit, these functional units occur as field apparatus or operating equipment.
Background technology
In measuring technique, control technology and regulation technology, usually come the field apparatus feed by two line circuits (Zweitdrahtleitung) for a long time, and transmit regulated value to display device and/or regulation technology device transmission measured value or from regulation technology equipment to field apparatus from this field apparatus.Wherein, each measured value or regulated value are converted to pro rata DC current, itself and feed DC current are superimposed, and the DC current that wherein shows measured value or regulated value can be the several times of feed DC current.Therefore, usually the feed current demand of field apparatus is set to about 4mA, and the dynamic range of measured value or regulated value is mapped to electric current between 0 to 16mA, makes and can adopt known 4...20mA current return.
That in addition the feature of novel field apparatus also is is general, as far as possible with the characteristic of respective process coupling.For this reason, but the alternating current transmission path of way traffic is set concurrently, on the direction of field apparatus, is transmitting supplemental characteristic by this alternating current transmission path with unidirectional direct current transmission path, and from field apparatus direction transmission measurement value and status data.Supplemental characteristic and measured value and status data are modulated to alternating voltage, preferably by frequency modulation (PFM).
In process control technology, the common field apparatus that in zone, so-called scene, is provided with and is connected conduct measurement assembly, adjusting part and display module according to predetermined safe condition scene.These field apparatuss have analog and digital interface for mutual data transmission.Wherein, data transmission is undertaken by the feeder line that is arranged on the power supply in the maintenance area.For Long-distance Control and these field apparatuss of remote diagnosis, in so-called maintenance area, also be provided with operating equipment, usually the requirement that proposes is seldom measured in the security of maintenance area.
By realize operating equipment in the maintenance area and the data transmission between the field apparatus by means of the known 20mA current return of FSK (frequency shift keying) modulation stack.Wherein, with two frequencies of frame mode (rahmenweise) simulation ground transmission corresponding to two state of value " 0 " and " 1 ".
Boundary condition of fsk signal (Rahmenbedingung) and modulation type were described in June 20 nineteen ninety " HART Physical Layer Specification Revision7.1-Final " (Rosemount Dokument Nr.D8900097:Revision B).
For according to HART actualizing FSK interface, the special ASIC that implements for this purpose, be common and commonly used on the market as for example HT2012 of SMAR company.The shortcoming of these special circuits is the fixed function scope that can't change, and the dirigibility that is complementary of the requirement of shortage that causes thus and variation.
Known novel automatic technical equipment has processing unit, so-called microcontroller usually, and wherein microcontroller is used to automatic technology task according to related functional unit according to the designated treatment data.
Seek in the control of the processing unit of automation device function, and wherein do not influence the automatic technology task of related functional unit according to HART agreement mapping (abbilden) FSK interface.
Summary of the invention
Therefore the technical problem to be solved in the present invention specifically provides a kind of automation device, has the device that is used for by known microcontroller itself data bit flow being converted to fsk signal.
According to the present invention, this technical matters solves with the feature of claim 1.
The present invention is from having the automation device of processing unit, wherein distributes at least one to be used to hold instruction for processing unit and the storage unit of data.This processing unit is connected with digital analog converter, and wherein the digital analog converter back is connected with wave filter.
In storage unit, store form.But this form comprises the sampled value of the predetermined quantity of trapezoidal time response curve.
Preferably, with than the sinusoidal time response curve of sampled value based on the little resolution of resolution just be enough on the trapezoidal time response curve of sampled value, produce fsk signal.Therefore, the requirement to digital analog converter has reduced; Simpler enforcement is just enough.In addition, so processing unit needs I/O circuit still less export sampled value, thereby has more I/O circuit to be used for other task, especially automatic technology task.
Description of drawings
Explain the present invention in detail by embodiment below.Required for this reason accompanying drawing illustrates:
Fig. 1 illustrates the schematic diagram of automation device,
Fig. 2 illustrates the synoptic diagram that data bit flow is converted to fsk signal.
Embodiment
In Fig. 1, automation device 100 is shown to understand degree required for the present invention.Automation device 100 is connected with automation device 100 ' of the same type basically by communication line 200.Communication line 200 is two-way settings.The information that sends from automation device 100 is received by automation device 100 ', and vice versa.Therefore an automation device 100 that reference is shown specifically below.
The core of automation device 100 is controllers 110, and it is connected with the element that provides clock-following clock generator 120-that is called for the sake of simplicity with storer 150 at least.But usually, the part of clock generator 120 has been implemented in the controller 110.
Controller 110 has the joint that is used to connect data meeting point 130 and data source 140.
The sensor that can be provided for physical quantity is converted to electric parameters is as data source 140, and wherein sensor is configurable and/or parameterisable.Wherein, configuration and/or parametrization are data meeting points 130.
In an optional embodiment, data meeting point 130 can be the actuator that electric parameters is converted to physical quantity, and its characteristic can be diagnosed.So the diagnostic device of She Zhiing is a data source 140 for this reason.
In another embodiment, automation device 100 can be the ingredient that is used for the higher level equipment of other automation device 100 ' two-way communication.In this embodiment, higher level equipment be data source 140 be again data meeting point 130.
In another embodiment, automation device 100 can be constituted as so-called protocol converter.In this embodiment, higher level equipment forms data source 140 and data meeting point 130 by the second communication system.
But,, when lacking data meeting point 130, exist data source 140 just enough in order to carry out the present invention.
In addition, controller 110 is connected with digital analog converter 160, and wherein the digital analog converter back is connected with wave filter 170.The output terminal of wave filter 170 is connected with communication line 200.In addition, communication line 200 causes the input endpoint of controller 110, by the line signal 201 on this input endpoint received communication circuit 200.
Below explain in detail action principle of the present invention.For this reason, Fig. 2 is by adopting identical Reference numeral that the effect connection layout that data bit flow is converted to fsk signal is shown with synoptic diagram to identical device.
But in storer 150, store the form 151 of the sampled value of predetermined quantity with a trapezoidal time-varying process.Especially, stipulate lucky 4 sampled values for trapezoidal time response curve.
According to the data bit flow of handled transmission data 141 in data source 140, from form 151, read identical sampled value continuously, and the faster or output more lentamente corresponding to data bit flow.For this reason, from first clock 121, derive first clock frequency, derive the second clock frequency different with first clock frequency with second frequency divider 113 with first frequency divider 112.Clock 121 is preferably provided by the clock generator 120 of controller 110.The function of first frequency divider 112 and second frequency divider 113 is by control 110 reflections (abbilden).
At selected 4 samples, with enough reproducibilities, constantly irrespectively phase error is remained within the boundary of allowing with conversion.
According to data bit flow, be used to export the output clock of sampled value-represent-between first clock frequency and second clock frequency, switch for output logic 1 and for output logic 0 with switch 114.Switch 114 forms by the program function of controller 110.
By digital analog converter 160 with sampled value be converted to simulation, sine-shaped signal basically, be optimized in the wave filter 170 of the curve shape of this signal after being connected.Wave filter 170 is implemented as the low-pass filter of second order.Output terminal at wave filter 170 can obtain fsk signal 201.
Advantageously, phase error keeps very for a short time by the exchange of the frequency from a sampled value to back to back next sampled value.
In special embodiment of the present invention, digital analog converter 160 is the digital analog converters that are connected (geschaltet Typ) pulse-length modulation of type.For this reason, the output clock that will be used to export sampled value is guided digital analog converter 160 into.
Advantageously, the energy requirement of this converter is especially little, and this has catered to the application in the field apparatus of remote feeding electricity.
Reference numeral
100,100 ' automation device
110 controllers
112,113 frequency dividers
114 switches
120 clock generators
121 clocks
130 data meeting points
140 data sources
141 send data
150 storeies
151 forms
160 digital analog converters
170 wave filters
200 communication lines
201 fsk signals
Claims (1)
1. automation device, wherein a plurality of functional units that spatially separate intercom mutually by common transmission protocol, described equipment has microcontroller, wherein distribute at least one clock generator and storage unit for described microcontroller, and described microcontroller is connected with the data source that is used to export data bit flow to be sent at least, it is characterized in that, adjustable land used is stored the continuous sequence of the sampled value of trapezoidal time response curve in described storage unit (150), makes alternately to use the clock of first clock generator (112) or the clock of second clock generator (113) to export described sampled value according to described data bit flow.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005043419.3 | 2005-09-13 | ||
| DE200510043419 DE102005043419A1 (en) | 2005-09-13 | 2005-09-13 | Automation technology device for communication of spatially distributed functional units, has memory unit from which sequential series is retrieved for issuing sampling value depending on data bit stream with master clock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1932910A true CN1932910A (en) | 2007-03-21 |
| CN100520847C CN100520847C (en) | 2009-07-29 |
Family
ID=37763078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101539240A Expired - Fee Related CN100520847C (en) | 2005-09-13 | 2006-09-12 | Automation device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100520847C (en) |
| DE (1) | DE102005043419A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4104637A (en) * | 1976-10-27 | 1978-08-01 | E-Systems, Inc. | VOR phase monitoring system |
| US5225787A (en) * | 1991-05-10 | 1993-07-06 | U.S. Philips Corporation | Sampling frequency converter including a sigma-delta modulator |
| MX9602687A (en) * | 1994-02-23 | 1997-05-31 | Rosemount Inc | Field transmitter for storing information. |
-
2005
- 2005-09-13 DE DE200510043419 patent/DE102005043419A1/en not_active Withdrawn
-
2006
- 2006-09-12 CN CNB2006101539240A patent/CN100520847C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005043419A1 (en) | 2007-03-15 |
| CN100520847C (en) | 2009-07-29 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20160912 |
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| CF01 | Termination of patent right due to non-payment of annual fee |