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EP2380064A1 - Dispositif et procédé d identification automatique d une interface - Google Patents

Dispositif et procédé d identification automatique d une interface

Info

Publication number
EP2380064A1
EP2380064A1 EP09756280A EP09756280A EP2380064A1 EP 2380064 A1 EP2380064 A1 EP 2380064A1 EP 09756280 A EP09756280 A EP 09756280A EP 09756280 A EP09756280 A EP 09756280A EP 2380064 A1 EP2380064 A1 EP 2380064A1
Authority
EP
European Patent Office
Prior art keywords
interface
unit
signal
position measuring
data transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP09756280A
Other languages
German (de)
English (en)
Inventor
Elmar Mayer
Alexander Kobler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Johannes Heidenhain GmbH
Original Assignee
Dr Johannes Heidenhain GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Publication of EP2380064A1 publication Critical patent/EP2380064A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25217—Configure communication protocol, select between several

Definitions

  • the invention relates to an apparatus and a method for the automated detection of an interface between a position measuring device and a subsequent electronics according to claims 1 or 9.
  • a position measuring device By means of such a device, or a method according to the invention, in the position measuring device is an automated detection of the Subsequent electronics used interface possible.
  • serial data interfaces For the transmission of the absolute position values mainly serial data interfaces are used, since they manage with only a few data transmission lines and nevertheless have high data transmission rates. Particularly advantageous here are the so-called synchronous serial interfaces, which have a unidirectional or bidirectional data line and a clock line. The transmission of data packets over the data line is synchronous with a clock signal on the clock line.
  • synchronous serial interfaces In automation technology, a variety of standard interfaces has prevailed, popular representatives for synchronous serial interfaces, for example, the EnDat interface of the applicant, another is known under the designations SSI.
  • asynchronous serial interfaces such as Hiperface are also common.
  • the SSI interface is described in EP0171579A1. It is a synchronous-serial data interface with a unidirectional data and a unidirectional clock line. Reading out positives Ons double of a position measuring device takes place here in synchronism with a clock signal on the clock line.
  • EP0660209B2 describes the basis of the Applicant's EnDat interface.
  • This is also a synchronous-serial interface, which has a bidirectional data line in addition to the unidirectional clock line. This allows transmission of data in both directions - from the sequential electronics to the position measuring device and from the position measuring device to the subsequent electronics. The data transmission also takes place here synchronously with a clock signal on the clock line.
  • DE19701310B4 describes a device for data transmission between a transducer designed as a position measuring system and a processing unit. By transmitting a reference signal on one of the signal transmission lines, via which the data transmission between the transducer and the processing unit takes place, the position measuring system can be switched to different operating modes.
  • Standardized interfaces offer the advantage that measuring devices equipped with such an interface can be connected directly to subsequent electronics, for example a machine tool control system.
  • subsequent electronics for example a machine tool control system.
  • it is disadvantageous for the measuring device manufacturer that he has to offer the measuring devices with different standard interfaces in order to be able to offer solutions for subsequent electronics which are already equipped with a specific interface. This results in a large variety of variants, which requires a great deal of effort in product maintenance and makes storage considerably more difficult.
  • JP8185591A describes an absolute position measuring device that supports multiple transmission formats.
  • the selection of the transmission format via a selection signal which is supplied to the position measuring device via additional lines of the subsequent electronics.
  • the requirement to provide additional lines increases the cabling complexity. wall considerably and is therefore undesirable.
  • this solution is inflexible because the transmission format must be set manually.
  • a device is now proposed for the automated detection of an interface between a position measuring device and a subsequent electronic unit, which are connected to one another via a data transmission channel, wherein the position measuring device comprises an interface unit and a position measuring unit.
  • the interface unit is connected to the data transmission channel on the one hand and to the position measuring unit for the purpose of exchanging data on the other hand.
  • the interface to the subsequent electronics can be selected from at least two interfaces.
  • the position measuring device further comprises an interface recognition unit which is supplied with at least one input signal arriving from the sequential electronics via the data transmission channel and which comprises the means for determining the time sequence of signal edges of the at least one input signal in conjunction with the signal state, and an evaluation unit in which, by evaluating the determined time sequence, the interface used for the subsequent electronics can be recognized and selected in the interface unit.
  • an interface recognition unit which is supplied with at least one input signal arriving from the sequential electronics via the data transmission channel and which comprises the means for determining the time sequence of signal edges of the at least one input signal in conjunction with the signal state
  • an evaluation unit in which, by evaluating the determined time sequence, the interface used for the subsequent electronics can be recognized and selected in the interface unit.
  • a method is proposed for automated recognition of an interface between a position measuring device and subsequent electronics, - A -
  • the position measuring device comprises an interface unit and a position measuring unit.
  • the interface unit is connected to the data transmission channel on the one hand and to the position measuring unit for the purpose of data exchange on the other hand.
  • the interface to the subsequent electronics can be selected from at least two interfaces.
  • an interface recognition unit is furthermore arranged, which is supplied with at least one input signal which arrives from the subsequent electronics via the data transmission channel.
  • FIG. 1 shows a block diagram of a device according to the invention
  • FIG. 2 a shows a data transmission channel with a line pair operated unidirectionally and a bidirectionally operated line pair
  • FIG. 2b shows a data transmission in unidirectionally operated pairs of lines, in the case of data transmissions
  • FIG. 2c shows a data transmission channel with a bidirectionally operated line pair
  • FIG. 3 is a block diagram of an interface recognition unit
  • FIG. 4a shows a signal diagram of the beginning of a data transmission at the interface EnDat and FIG. 4b shows a signal diagram of the beginning of a data transmission at the interface SSI.
  • FIG. 1 shows a block diagram of a device according to the invention with a position measuring device 10, which is connected via a data transmission channel 100 with a subsequent electronics 110, for example a numerical machine tool control (NC).
  • Position measuring device 10 and subsequent electronics 110 exchange commands and data via the data transmission channel 100.
  • a master-slave connection with the sequential electronics 10 taking over the function of the master and the position-measuring device 10 assuming the function of the slave, i.
  • Each data transmission is initiated by the subsequent electronics 1 10, while the position measuring device 10 transmits data only on request to the subsequent electronics 1 10.
  • the physical connection between subsequent electronics 1 10 and position measuring device 10 for the purpose of data transmission represented by the data transmission channel 100
  • the so-called. Interface protocol referred to.
  • the data transmission channel 100 is usually designed for serial data transmission, ie it consists of at least one serial data connection, which, if the transmission is differentiated according to RS-485 standard, consists of at least one line pair and is completed on both sides with suitable driver / receiver modules , If the transmission takes place via only one bidirectionally operated differential pair of lines, this is also referred to as a 2-wire interface.
  • a popular example of this is the parameter channel of the Hiperface interface.
  • the EnDat and SSI interfaces mentioned in the introduction use two differential line pairs and are thus referred to as 4-wire interfaces.
  • termination resistors R1, R2, R3 are also shown in FIG which are used to attenuate signal reflections on the lines. In practice, 10 terminating resistors R1, R2, R3 can be provided both on the side of the position measuring device 10, as well as on the side of the subsequent electronics. Differential data transmission has long been known to the person skilled in the art and will not be described further here.
  • the position measuring device 10 should be suitable in this example for the automated detection of 2-wire interfaces and 4-wire interfaces.
  • the two possible signal line pairs should be usable and thus interchangeable.
  • the variants shown in FIGS. 2a to 2c must be taken into account here:
  • the two signal line pairs of the data transmission channel 100 on the side of the position measuring device 10 are each terminated with a differential transmitter / receiver pair.
  • the receiver / transmitter modules are present, which requires the interface used.
  • the data transmission channel 100 is connected in the position measuring device 10 with an interface unit 20, the commands and input data from the subsequent electronics 1 10 receives, interprets and forwards via an internal interface to a position measuring unit 30.
  • the latter processes commands and input data and, if output data, for example an absolute position value, has been requested, transmits these via the internal interface to the interface unit 20, which processes the output data in accordance with the interface protocol and sends it to the sequential electronics 110.
  • the position measuring unit 30 generates position signals by scanning a measuring standard with a scanning unit and converts these into digital position values which indicate the absolute position of the scanning unit relative to the measuring scale.
  • the physical principle on which the scanning is based is not relevant here; for example, optical, magnetic or inductive measuring principles can be used.
  • further data can be generated in the position measuring unit 30. These include, for example, further measured values resulting from the relative movement between the scanning unit and the material measure, such as speed or acceleration.
  • the other data can also be measured values that relate to the environmental conditions, eg temperature values.
  • status information can also be made available as further data, for example in the form of status bits or a status word whose bits signal warning or error states.
  • the position measuring unit 30 may include other components, such as a CPU for performing complex calculations, and a memory unit, the representation of which has been omitted here. Access to the components arranged in the position measuring unit 30 or the data exchange with these components takes place via the interface unit 20.
  • the interface protocol which determines the communication between subsequent electronics 1 10 and position measuring device 10 via the data transmission channel 100.
  • parallel data transmission is preferably used here. Thereby, the time between the arrival of a command over the communication channel 100 and the transmission of requested data (eg the position value) via the communication channel 100.
  • the interface unit 20 is switchable, i. the interface unit 20 offers a choice of at least two interfaces, for example EnDat and SSI, from which one can be selected. In this way, the position measuring device 10 can be connected to subsequent electronics 1 10 support either SSI or EnDat interfaces. It is obvious that position measuring devices 10, which support a multiplicity of different interfaces, drastically reduce the necessary variety of variants, since they support many subsequent electronics 110 without any effort by simply selecting an interface that supports both the subsequent electronics 110 and the position measuring device 10 will be able to be connected.
  • the interface unit 20 is preferably of modular construction and offers specific interface modules 22.1, 22.2 for the supported interfaces. to 22. n, of which according to the interface used by the subsequent electronics 1 10 one is selected.
  • a general interface module 23 is provided with the specific interface modules 22.1, 22.2. to 22. n communicates via a standard interface 24.
  • an interface detection unit 200 is arranged for automated detection of the connected interface, the input signals E1, E2 are supplied, which arrive via the data transmission channel 100.
  • the number of input signals is limited to two only in this embodiment.
  • both interfaces are known, having only one input signal, as well as interfaces that transmit more than two input signals. Detection occurs, as will be further explained below, by analyzing the timing of signal edges and levels of the input signals. As long as the interface has not been detected, the connection of the interface unit 20 to the data transmission channel 100 is interrupted. For this purpose, a switching unit 215 is provided.
  • the driver blocks which are provided for the transmission of data to the subsequent electronics 1 10, inactive, so it will be analyzed exclusively via the data transmission channel 100 incoming signals.
  • the interface detection unit 200 After successful recognition of the interface, the interface detection unit 200 correspondingly switches over the interface unit 20, for example via a selection line 210, or selects a specific interface module 22.1, 22.2 to 22. n and establishes the connection between the interface unit 20 and the data transmission channel 100 Switching unit 215 restored.
  • the automated recognition of the interface is limited to a special programming mode of the position measuring device 10, in which the position measuring device 10 is located after delivery.
  • a non-volatile memory such as an EEPROM, or the selected specific interface module 22.1, 22.2. to 22. n, so that once the interface used has been detected, no further automatic detection is required.
  • the programming mode is ended.
  • a special mechanism can be provided to switch the position measuring device 10 again into the programming mode. For example, the switching to the programming mode, as proposed in DE19701310B4, by a Reference signal, which is transmitted on one of the signal transmission lines of the data transmission channel 100 from the sequential electronics 1 10 to the position measuring device, initiated.
  • the input signals E1, E2 which arrive at the interface detection unit 200 via the data transmission channel 100, are supplied to edge detection units 220, 221.
  • edge detection units 220, 2221 These encode signal states or transitions of the respective input signal E1, E2 on each of two status lines whose digital signal levels are assigned to the four states or transitions - low level high level - rising edge falling edge and a control unit 240, as well as a state memory unit 230 are supplied.
  • the edge detection units 220, 221 also recognize the state "tri-state” or "high-resistance".
  • control unit 240 detects an edge in one of the input signals E1, E2, it evaluates the event as the beginning of a data transmission and starts a recognition sequence by starting a timer 250 via a start line 241 and the digital signal levels of the status lines, as well as the value of the timer 250 by means of a write line 242 in the state memory unit 230 stores. This store operation is repeated for a specified number of signal edges. In this way, the state memory unit 230 is filled with data records which contain signal states or transitions of the input signals E1, E2 and the times associated therewith, so-called time stamps. Alternatively, the timer 250 can also be started immediately after switching on, for example after a switch-on reset process.
  • timer 250 is only started once and then counts continuously, the time between two signal edges or up to to the first signal edge (when timer 250 is already started after power up), by forming the difference between two timer values. If, on the other hand, the timer 250 is restarted for each detected signal edge, then the timer value directly corresponds to the time between two signal edges.
  • the number of data records required depends on how many and which interfaces are to be detected. At least as many data records must be recorded that exactly one interface can be determined unambiguously from all interfaces in question. In order to produce a redundancy, it is particularly advantageous to record additional data records, so that a check / confirmation of the determined interface is possible.
  • control unit stops the timer 250 and signals via an evaluation line 243 of an evaluation unit 260 that it can evaluate the data records.
  • the data sets are evaluated by analyzing the time sequence of the signal transitions (edges) and the associated signal states and comparing them with characteristic signal sequences of available interfaces, which are stored in a database 270, for example.
  • the evaluation may include testing for one or more of the following decision criteria:
  • An identification code may, for example, be a pulse sequence which, irrespective of the actual execution of the Interface (synchronous / asynchronous, number of input signals ...), which allows selective selection of an interface.
  • the validity of the identification code is advantageously limited to the programming mode.
  • the absence of signal edges ie the determination that a defined time after switching on or the beginning of the recognition process, the input signals E1, E2 have a constant logic level, can serve as a decision criterion.
  • decision criteria for the unique recognition of the interface used depends on the type and number of available, or to be recognized interfaces. If, for example, only two interfaces are to be distinguished which have different quiescent levels, the consideration of the signal levels before the first clock edge is sufficient.
  • the decision whether it is a synchronous or an asynchronous interface can be made after the detection of a clock signal or a characteristic signal sequence. To distinguish between two synchronous interfaces, the consideration of the signal levels of the second input signal at signal edges of the (already recognized) clock signal can be used.
  • the evaluation unit 260 After recognition of the interface used, the evaluation unit 260 selects the corresponding interface via the selection line 210.
  • the evaluation can also be carried out without prior intermediate storage by supplying the data records directly to the evaluation unit 260. In this case, however, a high processing speed is required in the evaluation unit 260.
  • FIG. 4a shows the beginning of a data transmission from the sequential electronics 110 via the data transmission channel 100 to the position measuring device 10 using the interface EnDat, which is described for example in EP0660209B2.
  • the first input signal E1 is at high level, the level of the second input signal E2 is low.
  • the first input signal E1 in this example corresponds to the signal on the clock line, while the second input signal E2 represents the signal on the bidirectionally operated data line.
  • the transmission begins with a falling edge of the first input signal E1, while the second input signal E2 is in the output state, ie immediately after switching, high impedance (tri-state) is connected.
  • high impedance tri-state
  • a voltage sets in on the second signal line E2 which is determined by the termination resistors R1, R2, R3.
  • the termination resistors R1, R2, R3 are usually dimensioned such that the resulting voltage on the second signal line E2 is interpreted by the receiving side, in this case the position measuring device 10, either as a high level or a low level, wherein the termination resistors R1, R2, R3 are preferably dimensioned so that the position measuring device 10 detects a high level.
  • the sequential electronics 1 10 starts transmitting a command (referred to in the terminology of EP0660209B2 as a status command). This consists of three consecutively transmitted bits, which are then repeated in inverted form. In an alternative embodiment of the EnDat interface, however, the repetition of the command can also take place in the same polarity.
  • FIG. 4b shows the signal states at the beginning of a data transmission at the SSI interface which, as already mentioned in the introduction, is described in EP0171579A1.
  • the first input signal E1 is the signal on the clock line and the second input signal E2 is the signal on the data line
  • first input signal Nal E1 in the initial state also to high level and the data transfer begins with a falling edge of the first input signal E1.
  • the second input signal E2 regardless of the input signal E1 always remains at the same level, in turn of termination resistors R1, R2, R3 is determined.
  • the second input signal E2 has a constant low level.
  • the clock line can now be identified by the fact that the signal on this line (in the example, the first input signal E1) has further edges at regular time intervals after the first edge.
  • the detection of the clock line is not sufficient in this example as a decision criterion for the determination of the interface used, since it is in both cases to synchronous interfaces.
  • the consideration of signal levels of the second input signal E2 at signal edges of a first input signal E1 (the clock signal) can be used as a further decision criterion. Since no level change can occur on the data line in the case of the SSI interface, but a command is transmitted in the case of the EnDat interface, and the logic level on the data line therefore changes, an unambiguous determination of the interface is possible.
  • a previous level change at the time in which the second input signal E2 is switched to high impedance in FIG. 4a, is unreliable as a decision criterion since it depends on the dimensioning of the termination resistors R1, R2, R3.
  • a sequence of signal edges at irregular intervals would be an indication of a Asynchronous interface over which an ASCII-coded character is transmitted.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

La présente invention concerne un dispositif et un procédé permettant d'identifier automatiquement une interface entre un appareil de mesure de position (10) et un équipement électronique asservi (110), qui sont reliés entre eux par un canal de transfert de données (100), l'appareil de mesure de position (10) comprenant une unité d'interface (20) et une unité de mesure de position (30). L'unité d'interface (20) est reliée d'une part au canal de transfert de données (100) et d'autre part à l'unité de mesure de position (30) en vue d'un échange de données interne. Dans l'unité d'interface (20), l'interface avec l'équipement électronique asservi (110) peut être sélectionnée parmi au moins deux interfaces. Dans l'appareil de mesure de position (10) se trouve également une unité d'identification d'interface (200) à laquelle est envoyé au moins un signal d'entrée (E1, E2) provenant de l'équipement électronique asservi (110) par le biais du canal de transfert de données (100) et qui comprend des moyens permettant de déterminer la séquence temporelle de flancs de signaux d'au moins un signal d'entrée (E1, E2) en combinaison avec l'état du signal, ainsi qu'une unité d'évaluation (260) dans laquelle l'interface utilisée avec l'équipement électronique asservi (110) peut être identifiée en évaluant la séquence temporelle définie et dans laquelle l'unité d'interface (20) peut être sélectionnée.
EP09756280A 2008-12-18 2009-11-03 Dispositif et procédé d identification automatique d une interface Ceased EP2380064A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008054887.1A DE102008054887B4 (de) 2008-12-18 2008-12-18 Vorrichtung und Verfahren zur automatisierten Erkennung einer Schnittstelle
PCT/EP2009/064489 WO2010069664A1 (fr) 2008-12-18 2009-11-03 Dispositif et procédé d’identification automatique d’une interface

Publications (1)

Publication Number Publication Date
EP2380064A1 true EP2380064A1 (fr) 2011-10-26

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EP09756280A Ceased EP2380064A1 (fr) 2008-12-18 2009-11-03 Dispositif et procédé d identification automatique d une interface

Country Status (6)

Country Link
US (1) US10120359B2 (fr)
EP (1) EP2380064A1 (fr)
JP (1) JP5279920B2 (fr)
CN (1) CN102257446B (fr)
DE (1) DE102008054887B4 (fr)
WO (1) WO2010069664A1 (fr)

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DE102010038552A1 (de) * 2010-07-28 2012-02-02 Dr. Johannes Heidenhain Gmbh Vorrichtung zur Manipulation von Schnittstellensignalen
CN103163825B (zh) * 2011-12-09 2014-12-24 中国科学院沈阳计算技术研究所有限公司 四通道的数控系统endat2.2接口
DE102012201170A1 (de) * 2012-01-27 2013-08-01 Dr. Johannes Heidenhain Gmbh Vorrichtung zur Übertragung von Sensordaten
DE102012201651A1 (de) 2012-02-03 2013-08-08 Dr. Johannes Heidenhain Gmbh Positionsmesseinrichtung
JP2016004013A (ja) * 2014-06-19 2016-01-12 日本電産サンキョー株式会社 アブソリュートエンコーダ及び回転位置データ伝送方法
KR101560224B1 (ko) * 2014-10-27 2015-10-14 현대자동차주식회사 센터페시아 통합 인터페이스 제공 방법 및 장치
CN105049239B (zh) * 2015-06-25 2018-05-25 北京百度网讯科技有限公司 接口连接关系的识别方法和系统
CN108605056B (zh) * 2016-02-01 2021-06-29 高通股份有限公司 高速串行链路中的单向时钟信令
CN118170596B (zh) * 2024-03-29 2024-11-15 深圳市连创科技有限公司 一种基于人工智能的数据连接器动态监测方法及系统

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Also Published As

Publication number Publication date
DE102008054887A1 (de) 2010-07-01
CN102257446A (zh) 2011-11-23
CN102257446B (zh) 2013-11-06
JP2012513017A (ja) 2012-06-07
US10120359B2 (en) 2018-11-06
US20110258358A1 (en) 2011-10-20
DE102008054887B4 (de) 2021-03-25
WO2010069664A1 (fr) 2010-06-24
JP5279920B2 (ja) 2013-09-04

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