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
  • G05B23/00—Testing or monitoring of control systems or parts thereof
  • G05B23/02—Electric testing or monitoring
  • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
  • G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
  • G05B23/0267—Fault communication, e.g. human machine interface [HMI]
• • 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
  • G05B15/00—Systems controlled by a computer
  • G05B15/02—Systems controlled by a computer electric

Definitions

• measuring sensors and measured value displays are generally distributed over the system, with the measured values or measured data being transmitted from the measuring sensors to the measured value displays.
• the measurement data is increasingly displayed using freely programmable PCs.
• the measurement data are usually used to control the system.
• software ie data transmission and processing, plays an outstanding role in measuring systems. This is described in the guideline 7.1 of the European Cooperation in Legal Metrology (WELMEC): "Software Requirements on the Basis of the Measuring Instruments Directive” from October 1999 (www.welmec.org/publications/7-l.pdf) in Regarding the transmission and display of legal-for-trade data.
• WELMEC European Cooperation in Legal Metrology
• encrypt data subject to calibration which are transmitted via an unencapsulated transmission path, for example a network, to protect against manipulation.
• the address of the respective sender can be transmitted together with the data.
• the actuality of the data can be checked at the recipient.
• the display of the data subject to legal verification on a PC with a Windows user interface it is required that the data is displayed in a window that automatically always moves to the foreground and cannot be covered by other windows, and that the data subject to legal verification is displayed in the window in question in a form that is not to be confused with the other windows, and that the window that shows the data subject to legal verification is from a a part of the program that is subject to custody transfer, i.e. one that is protected against deliberate changes using common software tools (text editors), is administered.
• the invention is based on the object of specifying a practical method for displaying legal-for-trade data which meets the WELMEC requirements mentioned above.
• the object is achieved in that the data subject to legal verification are displayed by means of an industrial visualization system which can be configured with a given project planning software and has a standard interface for integrating further applications, the data requiring legal verification being transmitted to the visualization system with integrity be and in the
• Visualization system can be visualized by an application integrated via the standard interface in a form different from the display options that can be configured using the configuration software.
• Industrial visualization system is to be understood here as an operator control and monitoring device or HMI (Human Machine Interface) device, as is used in particular in process automation systems.
• HMI Human Machine Interface
• Functions, switches or process values are visualized on an operator or touch panel.
• processes, error messages or measured values can be displayed in an easily understandable manner for the observer.
• An optical recording of the process for example in the form of process images, makes operation easier for the user.
• the visualization system can be connected to the process automation system via a data connection and allows the process to be influenced using configurable function keys, buttons or display elements.
• the visualization system is configured using a specified project planning software that enables simple and quick implementation of ideas into simple and understandable images for the Visualization system enables, without the user having to have special programming knowledge.
• it has one or more standard interfaces. Examples are for the graphic import BMP, WMF, TIF, for the data exchange DDE, ODBC, RAS and for the integration of applications OLE and ActiveX. With these interfaces, data exchange between individual software products can be accomplished in a simple manner.
• ActiveX for example (previously also known as OCX-OLE Custom Control), allows finished application modules to be integrated in another application, for example in a visualization system.
• the process visualization can thus be enriched with functionalities that are not provided in the configuration software.
• the method according to the invention advantageously uses a standard interface of an industrial visualization system in order to integrate an application into the visualization system with which the integrity-protected legal-for-trade data can be visualized in a form that corresponds to the WELMEC guidelines.
• the legal-for-trade data is transferred within a system that is deemed to be closed, ensuring its integrity may be sufficient to meet the WELMEC requirements. Is the transmission path such.
• encryption of the data subject to custody transfer is required.
• the encrypted data in the visualization system is decrypted by the application integrated via the standard interface.
• the encryption of confidential data before it is transmitted to a recipient is generally known.
• the sender uses a public key of the authorized recipient to encrypt the data so that only he can decrypt the data with his own private key.
• the transmitter can be authenticated by signing the data.
• the sender encrypts the data with his own private key, while the recipient uses the sender's public key to decrypt the data.
• Data encrypted with public keys is not necessarily authentic, while data signed with private keys is not confidential. Encryption and signing can therefore be combined to create confidentiality and authenticity, for which purpose the sender first encrypts the data with the recipient's own private key and then with the recipient's public key. This is also possible with the method according to the invention.
• the data subject to legal verification are preferably encrypted on the transmitter side with a private key and decrypted on the receiver side with the same private key.
• the private keys are integrated in the manufacture of the sending device, for example a weighing module, and the receiving device, here the visualization system.
• the sender can determine a test code from the data, which is transmitted in encrypted form to the receiver.
• the receiver decrypts the check code and compares the check code thus decrypted with the check code calculated from the received data; if both check codes are the same, the integrity of the data is assured.
• the address of the respective transmitter can be transmitted in encrypted form together with the data and then visualized together with the associated data.
• the actuality of the data can finally be checked at the recipient.
• the data subject to legal verification is displayed on the industrial visualization system in a form that cannot be configured with the configuration software. This can be done in such a way that the data subject to calibration are visualized in a display area of the visualization system which is not accessible to the configuration software and is therefore reserved exclusively for the display of data subject to calibration.
• the data subject to legal verification can be visualized together with additional information that cannot be configured by the configuration software, for example a typical watermark in the background.
• a process scale (weighing module) 1 is arranged in the automation system and communicates with a. Via a backplane bus 2
• the CPU module 3 of the automation system communicates.
• the CPU module 3 like an industrial visualization system 4, is connected to a bus system 5, e.g. B. Profibus, the automation system connected.
• weighing data which are to be verified and are to be verified by a weighing cell are combined in a data record together with a description of the weighing module 1, a time stamp (date, time), possibly further parameters and a test code calculated from these data, and with one private key encrypted.
• This encrypted data record is transmitted to the CPU module 3 via the backplane bus 2 and is stored there together with unencrypted data in a memory.
• the unencrypted data can also be weighing data from the
• Weigh module 1 if, for example, this weighing data is not intended for use subject to verification can be used for control purposes within the automation system.
• the encrypted data record is transmitted to the industrial visualization system 4 via the unencapsulated bus system 5.
• This can be configured via a configuration interface using a specified configuration software that allows certain representations and forms of representation.
• the industrial visualization system 4 also has a standard interface for the integration of further applications, here z.
• B. ActiveX elements in the industrial visualization system 4. Using such an ActiveX element, the data set is decrypted, using the same private key as in the weighing module 1. The ActiveX element is checked by comparing the decrypted test code with the the integrity of the data calculated from the received data and shows the weighing data and the designation of the associated weighing module 1 on a display 6 of the industrial visualization system 4. The display is in a form that cannot be configured using the configuration software.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Human Computer Interaction (AREA)
• General Engineering & Computer Science (AREA)
• Computer And Data Communications (AREA)
• Storage Device Security (AREA)
• User Interface Of Digital Computer (AREA)
• Information Transfer Between Computers (AREA)
• Controls And Circuits For Display Device (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32335761

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (6)

• 2003
  • 2003-11-21 WO PCT/DE2003/003859 patent/WO2004049083A2/de not_active Application Discontinuation
  • 2003-11-21 CN CNB2003801039437A patent/CN100353272C/zh not_active Expired - Fee Related
  • 2003-11-21 EP EP03788801A patent/EP1563362A2/de not_active Ceased
  • 2003-11-21 US US10/535,719 patent/US7298369B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events