DE10217520A1 - Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller - Google Patents

Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller

Info

Publication number
DE10217520A1
DE10217520A1 DE2002117520 DE10217520A DE10217520A1 DE 10217520 A1 DE10217520 A1 DE 10217520A1 DE 2002117520 DE2002117520 DE 2002117520 DE 10217520 A DE10217520 A DE 10217520A DE 10217520 A1 DE10217520 A1 DE 10217520A1
Authority
DE
Germany
Prior art keywords
input
analog
connection
fieldbus
bus
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.)
Withdrawn
Application number
DE2002117520
Other languages
German (de)
Inventor
Andreas Wilmers
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.)
ABB AG Germany
Original Assignee
ABB Patent 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 ABB Patent GmbH filed Critical ABB Patent GmbH
Priority to DE2002117520 priority Critical patent/DE10217520A1/en
Publication of DE10217520A1 publication Critical patent/DE10217520A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/20Pc systems
    • G05B2219/21Pc I-O input output
    • G05B2219/21137Analog to digital conversion, ADC, DAC
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/20Pc systems
    • G05B2219/25Pc structure of the system
    • G05B2219/25335Each module has connections to actuator, sensor and to a fieldbus for expansion

Abstract

A field-bus connection system (1) includes a first input (PIN4) connected to the input of a binary input circuit (10), a second input (PIN3) connected via a protection circuit (13) and a resistance (R) to the first input (PIN4). An analog-digital (A/D) converter (12) is connected to a point of connection (V) between the protection circuit and the resistance (R). The outputs of the binary input circuit (10) and the A/D converter are connected to a microcontroller (11) which is set up therefore, to output a digital output value to the field bus (2).

Description

  • The invention relates to a system for connecting sensor elements to a fieldbus, which is referred to below as the fieldbus connection system or fieldbus plug.
  • Field buses are used in automation systems to connect sensors to the Input / output devices used by control and regulating devices. The sensors that can be used to record process variables, both binary and deliver analog signals.
  • State-of-the-art fieldbus plugs already exist for the transmission of binary sensor signals via fieldbuses. These fieldbus connectors have an input pin 4 with a signal swing of 0 to 24 V on the connection side for the sensors, i.e. the fieldbus-neutral connection side.
  • In an operating mode Mode 1 , which is provided for a direct connection of the sensor to the fieldbus plug, the binary input signal of the sensor is read in the fieldbus plugs usually used and transmitted via the fieldbus.
  • However, the fieldbus connector cannot directly output a Process analog sensors, for example a pressure sensor or a distance sensor.
  • The specification for decentralized and standardized installation technology for machine tools and production systems DESINA, which can be called up, for example, on the Internet at www.desina.de, describes a decentralized configurable input / output module that is connected to an open fieldbus system using a hybrid fieldbus connector , The configurable input PIN 4 of the input / output module is used for binary signals as well as for analog signals with a signal range from 0 V to 10 V.
  • The state-of-the-art fieldbus connectors are compatible with this Specification does not fully match. A solution is therefore proposed by means of which the fieldbus connector fully complies with the DESINA specification.
  • The invention has for its object a fieldbus connection system for connection to specify a binary or analog sensor element on a fieldbus that is connected to a can be implemented with relatively little effort and thus simplifies the fieldbus applications. and designed more cost-effectively.
  • This object is achieved by a fieldbus connection system with the in claim 1 specified features solved. Advantageous embodiments of the invention are in others Claims specified.
  • The fieldbus connector is expanded by the invention in its function so that it optionally, in addition to the binary sensors, also analog sensors that meet the DESINA specification correspond to the fieldbus.
  • The invention is based on the use of the configurable input PIN 4 of the input / output module described in the aforementioned DESINA specification for both binary and analog sensor signals.
  • This property is transferred in a modified form to the fieldbus connector according to the invention. For this purpose, the sensor signal, which is present at input PIN 4, is not only given to a binary input circuit of the fieldbus connection system, but also to the input of an analog-digital converter. The analog-to-digital converter has so far not been available in existing fieldbus connection systems.
  • The analog-digital converter is at its input by a Input protection circuit protected against damage from excessive input voltages.
  • The system according to the invention is set up to choose between two operating modes work.
  • In a first mode of operation, namely Mode 1 , the output value of the analog-digital converter is transmitted via the fieldbus in addition to the already implemented transmission of the binary signal value from input PIN 4 . For this purpose, the existing function of a microcontroller for the cyclical transmission of process data words, preferably with a word length of 16 bits, is used via the fieldbus.
  • In a second mode of operation, referred to as mode 2 , larger amounts of data can be input and output in serial operation.
  • By means of one connected to a fieldbus master of the fieldbus programmable logic controller (PLC), the selection is made whether the binary value or the analog value corresponding to the sensor signal is evaluated in the user program becomes.
  • Based on an embodiment shown in the drawing, the invention explained and described in more detail.
  • There is shown in FIG. 1 where the system 1 comprises field bus connection system 1 according to the invention for connecting a binary or analog sensor element 3 to a field bus 2, a first configurable input PIN 4 for the sensor signal and a second input pin 3 for the ground potential.
  • The first input PIN 4 is connected to the input of a binary input circuit 10 . If a sensor element 3 with a binary output signal is connected to the first input PIN 4 , the binary input circuit 10 feeds a binary input signal to a downstream microcontroller 11 .
  • The second input PIN 3 is connected to the first input PIN 4 via a protective circuit 13 and a resistor R. An analog-to-digital converter 12 is connected to a connection point V between the protective circuit 13 and the resistor R, the analog-to-digital converter 12 being decoupled from the first input PIN 4 via the resistor R.
  • The function of the protective circuit 13 is to protect the analog-to-digital converter 12 from being damaged by excessively high input signals.
  • For example, the protective circuit 13 is dimensioned for an input range from 0 to 10 V in such a way that the analog-to-digital converter 12 is protected against input voltages which are greater than 10 V.
  • The protection of the analog-to-digital converter 12 against input voltages which are too high is advantageously implemented by implementing the protective circuit 13 by means of a Zener diode or a transzorb diode.
  • The analog-digital converter 12 processes an analog sensor signal fed to it via its input and feeds the digitized output value, for example of 12 bits, to the microcontroller 11 .
  • The microcontroller 11 is set up for operation in the different operating modes, for example mode 1 and mode 2 , in order to output a digitized output value of the sensor element 3 to the fieldbus 2 .
  • In a first operating mode, mode 1 , the digitized output value of the analog-digital converter 12 and in a second operating mode, mode 2, the output value of the binary input circuit 10 is transmitted as a cyclic process data word via the fieldbus 2 .
  • In the second operating mode, mode 2 , the output value of the analog-digital converter is not transmitted.

Claims (8)

1. Fieldbus connection system ( 1 ) for connecting a binary or analog sensor element ( 3 ) to a fieldbus ( 2 ), the system ( 1 )
a) has a first input (PIN 4 ) which is connected to the input of a binary input circuit ( 10 ),
b) has a second input (PIN 3 ) which is connected to the first input (PIN 4 ) via a protective circuit ( 13 ) and a resistor (R),
c) an analog-digital converter ( 12 ) is connected at a connection point (V) between the protective circuit ( 13 ) and the resistor (R),
d) the outputs of the binary input circuit ( 10 ) and the analog-digital converter ( 12 ) are connected to a microcontroller ( 11 ) which is set up to output a digital output value to the fieldbus ( 2 ).
2. System according to claim 1, characterized in that the analog-digital converter ( 12 ) has an input range of 0 to 10 V.
3. System according to claim 1 or 2, characterized in that, the analog-digital converter ( 12 ) via the resistor (R) from the first input (PIN 4 ) is decoupled.
4. System according to any one of the preceding claims, characterized in that the protective circuit ( 13 ) protects the analog-to-digital converter against excessive input voltages.
5. System of one of the preceding claims, characterized in that the protective circuit ( 13 ) is implemented by means of a Zener diode.
6. System according to claim 1 to 4, characterized in that the protective circuit ( 13 ) is realized by means of a Tranzzorb diode.
7. System according to one of the preceding claims, characterized in that the microcontroller ( 11 ) in the first operating mode (mode 1 ) transmits the output value of the analog-digital converter ( 12 ) via the fieldbus ( 2 ) as a cyclic process data word.
8. System of one of the preceding claims, characterized in that the first input (PIN 4 ) is configurable.
DE2002117520 2002-04-19 2002-04-19 Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller Withdrawn DE10217520A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2002117520 DE10217520A1 (en) 2002-04-19 2002-04-19 Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2002117520 DE10217520A1 (en) 2002-04-19 2002-04-19 Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller

Publications (1)

Publication Number Publication Date
DE10217520A1 true DE10217520A1 (en) 2003-11-06

Family

ID=28798591

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2002117520 Withdrawn DE10217520A1 (en) 2002-04-19 2002-04-19 Field-bus connection system for connection of sensors to field-bus e.g. in automation systems, has outputs of binary input circuit and A/D converter connected to microcontroller

Country Status (1)

Country Link
DE (1) DE10217520A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT516188A3 (en) * 2014-08-29 2017-12-15 Haunsperger Johann Service and information system for buildings and procedures for this

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715006A1 (en) * 1987-05-06 1988-11-17 Philips Patentverwaltung Circuit arrangement for receiving analog and/or digital input signals
JPH0927749A (en) * 1995-07-12 1997-01-28 Nissan Motor Co Ltd Voltage monitor device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715006A1 (en) * 1987-05-06 1988-11-17 Philips Patentverwaltung Circuit arrangement for receiving analog and/or digital input signals
JPH0927749A (en) * 1995-07-12 1997-01-28 Nissan Motor Co Ltd Voltage monitor device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Integrated Circuits, Data Sheet: 8-bit AID and DIA Converter, Philips,Semiconductors,order numr: 939775009201, 13.Dez.2001, S.1-28 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT516188A3 (en) * 2014-08-29 2017-12-15 Haunsperger Johann Service and information system for buildings and procedures for this
AT516188B1 (en) * 2014-08-29 2018-03-15 Haunsperger Johann Service and information system for buildings and procedures for this

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: ABB AG, 68309 MANNHEIM, DE

8110 Request for examination paragraph 44
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20121101