EP2183670A1 - Procédé d'amélioration d'une fonction diagnostic d'un appareil de terrain - Google Patents

Procédé d'amélioration d'une fonction diagnostic d'un appareil de terrain

Info

Publication number
EP2183670A1
EP2183670A1 EP08802994A EP08802994A EP2183670A1 EP 2183670 A1 EP2183670 A1 EP 2183670A1 EP 08802994 A EP08802994 A EP 08802994A EP 08802994 A EP08802994 A EP 08802994A EP 2183670 A1 EP2183670 A1 EP 2183670A1
Authority
EP
European Patent Office
Prior art keywords
field device
diagnostic
information
knowledge system
rule
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Withdrawn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
EP08802994A
Other languages
German (de)
English (en)
Inventor
Eugenio Ferreira Da Silva Neto
Michael Maneval
Klaus Nunnenmacher
Georg Veith
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.)
Endress and Hauser Process Solutions AG
Original Assignee
Endress and Hauser Process Solutions AG
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 Endress and Hauser Process Solutions AG filed Critical Endress and Hauser Process Solutions AG
Publication of EP2183670A1 publication Critical patent/EP2183670A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • G06F11/2257—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using expert systems

Definitions

  • the present invention relates to a method for improving a diagnostic function of a field device which is connected via a field bus with a higher-level unit and which generates diagnostic information with respect to the field device and / or with respect to at least one other field device connected to the fieldbus ,
  • field devices are often used which serve to detect and / or influence process variables.
  • Sensors such as level gauges, flowmeters, pressure and temperature measuring devices, pH redox potential measuring devices, conductivity measuring devices, etc., which record the corresponding process variables level, flow, pressure, temperature, pH or conductivity, are used to record process variables.
  • actuators such as valves or pumps, via which the flow of a liquid in a pipe section or the level in a container can be changed.
  • field devices all devices are referred to in principle, which are used close to the process and provide the process-related information or process.
  • a variety of such field devices is manufactured and sold by the company Endress + Hauser.
  • Bus systems are connected to one or more higher-level units.
  • the higher-level units are control systems or control units, such as a PLC (Programmable Logic Controller) or a PLC (Programmable Logic Controller).
  • the higher-level units serve, among other things, for process control, process visualization, process monitoring and commissioning of the field devices.
  • Computer-aided maintenance systems used to maintain in one or more database (s) maintenance-related information regarding the field devices and, where applicable, other devices used in the installation ('computer-aided maintenance systems').
  • These typically software-based computer-aided maintenance systems can perform various functions related to the management and organization of maintenance, depending on the vendor and the configuration of each installation.
  • these computerized maintenance systems may perform the operations and functions that have traditionally been performed manually by maintenance personnel or by an administrator responsible for maintaining the equipment, to schedule scheduled maintenance, and to document performed maintenance.
  • CMMS Computer-aided maintenance management system
  • Asset management in particular administration and provision of Device data, manuals, checklists, warranty information, maintenance intervals, service agreements, purchase date information, expected life information, spare parts information, field device error message information and troubleshooting, and / or parameterization, calibration, and / or configuration information for each field device (and possibly other devices of a system);
  • CMMS complementary metal-oxide-semiconductor
  • PAM Plant Asset Management
  • CMMS and PAM have other software-based computer-aided maintenance systems that maintain maintenance-related information of one or more field devices in one or more databases, and these other maintenance systems typically perform at least some of the functionality discussed above with respect to CMMS and PAM.
  • databases and database systems which may also be equipped with additional functionalities, such as search functions.
  • databases and database systems for example, vendor-specific information relating to one or more of the field devices of the plant, plant-specific information, information relating to a digital communication over a fieldbus of the plant, and / or specific information relating to a process, an industry and / or an application stored and to get managed.
  • Some of these databases and database systems are provided and managed by the plant operator, so that only the plant operator can access them.
  • the computer or data processing system on which such a computerized maintenance system and / or the databases and database systems provided by the plant operator are / are implemented is often arranged spatially separate from the individual field devices (and possibly from other devices of the installation).
  • databases are also provided by manufacturers of field devices, by system operators, etc., centrally in one or more corresponding database (s) or database system (s).
  • the centrally provided information may include one or more of the informational areas mentioned above in relation to the proprietary information areas managed by the plant operators.
  • the information of these databases or database systems are, for example, via the Internet via corresponding portal pages, via password-protected logins are available.
  • databases or database systems are referred to as "centrally provided databases or database systems.”
  • up-to-date information about the field device such as information, may be available throughout the life cycle of a field device from that manufacturer with regard to the calibration of the field device, with regard to maintenance and repair work, with regard to procurement, installation, setup and operation, etc.
  • Such a system is provided, for example, by Endress + Hauser through the "Web-enabled asset management system W @ M".
  • field devices usually have diagnostic functions to monitor the process in the environment of the field device and / or the functionality of the field device itself and to determine if necessary, an abnormal situation. If an abnormal situation is detected, then in the Usually a corresponding diagnostic information sent to the parent unit. In addition, depending on the risk level (criticality) of the detected abnormal situation, the relevant field device can be automatically switched to emergency operation. In the higher-level unit or in another PC-based platform to which the diagnostic information has also been transmitted, a further analysis of the abnormal situation that has occurred is usually carried out and, if necessary, further required steps in the system, such as changing over the system an emergency operation, made. In the following, with reference to FIG. 1, various applied diagnostic functions of a field device 2 are explained. In Fig.
  • the field device 2 comprises a Resource Block RB and a Transducer Block TB, each of which is defined in the Foundation® Fieldbus Specification (Foundation® Specification, Function Block Application Process, Revision FS 1.7).
  • the "resource block” RB is connected to a hardware 6 of the field device 2 via a link 4.
  • the "transducer block” TB is connected via a further link 4 to a hardware 8 of a sensor (not shown) of the field device 2.
  • the field device 2 has functional blocks, which in the present example are formed by the standard function blocks "Analog Input” AI and "Proportional-Integral-Derivative” PID. These standard function blocks are also specified in the Foundation® Fieldbus specification.
  • a diagnostic block DB which is likewise formed by a function block, is provided in the field device.
  • the diagnostic block DB can perform one or more of the diagnostic functions explained below.
  • the "Resource Block” RB, the "Transducer Block” TB, and the function blocks "Analog Input” AI and "Proportional Integral Derivative” PID are each connected via links 4 to the diagnostic block DB. About the links 4, the respective Blocks communicate with each other, in Fig. 1, the direction of the flow of information is shown by the arrows on the links 4 respectively.
  • diagnostic block DB for example, a monitoring of
  • Values are performed to determine whether an upper or a lower limit is exceeded or fallen below. If this is the case, then this abnormal situation can be communicated to the higher-level unit by appropriate diagnostic information, in particular by status information which is transmitted by the field device together with the respective value to the fieldbus.
  • Such status information is available, for example, in the Profibus® Specification (Profibus Profile Specification, Version 3.0) and the Foundation® Fieldbus Specification, among others for the function blocks “Analog Input” (AI), “Discrete Input” (D1), “Totalizer” (TOT) (only for Profibus® bus system), “Analog Output” (AO) and “Discrete Output” (DO)
  • this status information can also be used to communicate further abnormal situations the higher-level unit and / or another PC-based platform reads out diagnostic information from the field device, in particular from the diagnostic block of the field device.
  • the diagnostic block DB as a further module also have a field device diagnostics (English: “Device Diagnostics”) and / or a loop diagnostics (English: “Loop Diagnostics”) have.
  • a field device diagnostics English: "Device Diagnostics”
  • a loop diagnostics English: "Loop Diagnostics”
  • Loop diagnostics can be used to monitor the functionality of a loop, such as a PID loop, for example, to monitor whether a PID loop is set correctly and whether the process variability of the PID Loop within a given frame.
  • Modern field devices are sometimes highly sophisticated Data processing and communication capabilities. This is made possible in particular by the provision of powerful CPUs and memories in the field devices.
  • These "smart” field devices provide diagnostic capabilities that were not possible with traditional, “simple” field devices with less powerful CPUs, memory, and less communication capabilities. While conventionally much of the detection and analysis of abnormal situations has been performed in the parent unit or other PC-based platform, in the “smart” field devices further diagnostics are performed in the field device itself and the result sent digitally over the fieldbus to the parent
  • These diagnostic functions carried out in the field device comprise, in particular, the execution of statistical process monitoring SPM (Statistical Process Monitoring) and a pattern recognition technology ("Pattern Recognition Technology").
  • SPM Statistical Process Monitoring
  • Pattern Recognition Technology Pattern Recognition Technology
  • diagnostic PV diagnostic process variables, "diagnostics PV” or “diagnostic process variables”
  • a signal in particular the output value of a sensor or another process, is detected at a specific frequency.
  • the advantage in the detection of the signal by the field device itself is that this detection can be performed at a very high frequency and thus valuable diagnostic information about the detected signal can be created.
  • drift, distortion (bias), noise and / or peaks of the signal may be detected by the SPM.
  • the noise can increase or decrease.
  • Drift is a gradual change of the signal. With a bias, the value or level of the signal changes, so there is an offset to the normal level of the signal. If peaks occur in the signal, then some values of the detected signal are significantly higher or lower than the normal noise of the signal.
  • the pattern recognition technology is undergoing
  • Diagnostic algorithm first a learning phase, and only then the actual process monitoring (monitoring phase) is performed.
  • the field device is operated during a "normal" process sequence and thereby determines parameters that are typical of a normal process flow.
  • This parameter set created in the learning phase is also referred to as a reference pattern, whereby such a reference pattern can already be provided by the manufacturer in the field device Additionally or alternatively, the plant operator may have the field device undergo the learning phase at the actual site of use in the facility
  • the pattern recognition technology is combined with the SPM, such that in particular a reference pattern is created with respect to statistical parameters of a detected signal.
  • a mean value, a variance, a standard deviation and / or a difference between a maximum value and a minimum value of the detected signal can be determined as typical statistical parameters
  • the detected signal can also be processed, in particular filtered and / or smoothed and then analyzed.
  • other statistical methods for evaluating the signal such as PLS (partial least square analysis) and PCA (principal component analysis) are used.
  • PLS partial least square analysis
  • PCA principal component analysis
  • the field device transmits corresponding diagnostic information via the fieldbus, which if appropriate specifies further details of the type of deviation from the reference pattern, to the higher-level unit and / or to another PC-based platform.
  • the parent unit and / or the another PC-based platform further analyzes the diagnostic information obtained and then takes appropriate measures to prevent the process in the system from being damaged, to issue an alarm message and / or to place an order for a corresponding maintenance order.
  • the pattern recognition technology with the SPM so abnormal situations can be detected early and corrected in a timely manner. This can be used to implement a predictive maintenance strategy, which means that the abnormal situation has no or very little effect on the process, as it can be detected and corrected in a timely manner.
  • diagnostic service programs are implemented in the higher-level unit or, if appropriate, in another PC-based platform to which the diagnostic information is transmitted.
  • diagnostic service programs the diagnostic information obtained, in particular the type of deviation of the parameters from the reference pattern, are analyzed.
  • the diagnostic service program can in many cases provide detailed information about the cause of the abnormal situation and / or a recommendation to remedy it, i. indicate an error occurred and / or a maintenance work to be performed. For example, it is then indicated by such a diagnostic service program that a particular sensor is dirty and accordingly cleanable.
  • diagnostic service programs There is a problem with such diagnostic service programs that they do not have for all possible deviations of the parameters of a reference pattern a link to a corresponding cause and / or a recommendation to remedy them. This means that the diagnostic service program can not always provide detailed information and / or error messages. Some of them are also from Diagnostic information transmitted to the field device is not sufficiently detailed, so that several possible causes are determined by the diagnostic service program. In order to minimize the number of such cases, the diagnostic service programs are created specifically for certain types of field devices and include the greatest possible number of links between possible parameter patterns and corresponding causes and / or recommendations for remedying them. However, the scope of such sophisticated and specialized diagnostic service programs is limited to the particular type of field devices.
  • the object of the present invention is a
  • a method for improving a diagnostic function of a field device which is connected via a field bus with a higher-level unit and with respect to the field device and / or with respect to at least one other field device connected to the field device diagnostic information created, deployed.
  • the generated diagnostic information is transmitted to a knowledge system that has at least access to maintenance-relevant information with respect to the field device to which the diagnostic information is created.
  • the method has the following steps, which are performed after performing a maintenance job on the field device to which the diagnostic information is created:
  • maintenance generally refers to maintenance, inspection, repair and improvement
  • Maintenance includes measures for delaying wear on a device
  • inspection includes measures for determining and assessing an actual state of a device
  • measures for returning a device to a functional state such as a repair etc.
  • Improvements include, in particular, increasing the functional reliability of a device without changing the function performed by the device Maintenance, inspection, repair and improvement.
  • Persons performing the maintenance, inspection, repair and improvement measures are referred to herein generally as maintenance personnel.
  • Automated updating is understood to mean that this updating in the field device is performed automatically, i.e., without human intervention. Preferably, this updating is performed by appropriate software in the field device.
  • the knowledge system may include one or more of the above-described computer-aided maintenance systems, databases and / or database systems that manage maintenance-relevant information integrally.
  • the knowledge system may also be completely or partially separate and have access only to all or part of these systems.
  • the fieldbus can be formed for example by a Profibus® bus system, a Foundation® Fieldbus bus system or by a HART® bus system.
  • non-standardized, digital bus systems are possible.
  • the rules preferably correspond to the respective bus standard, so that step C) of the automated updating in the individual field devices can be carried out without difficulty.
  • the bus connection can be wired or wireless (wireless) realized.
  • sensors and actuators in particular come into consideration.
  • the field device generates "diagnostic information" with respect to "the field device and / or” with respect to at least one other field device connected to the fieldbus, not only diagnostic information directly to the field device itself, such as Defect on a sensor of the field device includes, but this diagnostic information may also relate to causes that are only in the environment of the field device, so that they can be diagnosed by the field device, for example, errors in communication via the fieldbus or the diagnosis, Accordingly, the "maintenance-relevant information relating to the field device" referred to in claim 1, a "maintenance work performed on this field device” and the “in relation to this field device include on Errors that have occurred "Information, maintenance work or errors that affect not only the field device directly but also its environment and / or sphere of influence.
  • step C) of the automated Updating the diagnostic function of the field device requires some intelligence of the field device.
  • the field device preferably has a built-in intelligence, in particular a CPU (Central Processing Unit) and a memory unit, which is designed such that the step of the automated updating of the diagnostic function of the field device can be carried out by the built-in intelligence.
  • a CPU Central Processing Unit
  • a memory unit which is designed such that the step of the automated updating of the diagnostic function of the field device can be carried out by the built-in intelligence.
  • field devices connected to a fieldbus do not have sufficient data processing and storage capabilities to perform this step.
  • such "simple" field devices can also generate no or only limited diagnostic information.
  • This field device generating diagnostics can also generate diagnostic information for several simple field devices, in which case the diagnosing field device can generate all diagnostic information or only supplementary diagnostic information for the simple field device
  • the diagnosing field device can generate all diagnostic information or only supplementary diagnostic information for the simple field device
  • steps A for example, values which are transmitted from the simple field device to the fieldbus, and to generate diagnostic information about these values, are accordingly referred to in step A) of claim 1 between the diagnostic information generated prior to performing the maintenance work in relation to the simple field device and the maintenance work performed on this simple field device and / or the error that has occurred with respect to this simple field device.
  • steps B) and C) of claim 1 relate to the transmission of the rule to the field device that generates the diagnosis and the automated updating of the diagnostic function of at least the field device that generates the diagnosis.
  • a higher-level unit such as a PLC
  • the diagnostic function of the superordinate unit is improved as indicated in the method according to claim 19.
  • the field device creates diagnostic information with respect to itself.
  • the steps A), B) and C) given in claim 1 all relate to at least the field device which has generated the diagnostic information with respect to itself.
  • the rule is transmitted at least to the field device, by which the diagnostic information was created.
  • the knowledge system can also transfer the rule to other field devices. This can be done by sending (broadcasting) to all field devices with which the knowledge system can communicate. In this case, it is advantageous if step C) is carried out only by the field devices for which the transmitted rule is actually relevant.
  • the knowledge system may also selectively transmit the rule only to the field devices that are of the same type and / or that are connected to the same fieldbus.
  • step A preferably takes place automatically by a corresponding software implemented in the knowledge system.
  • a rule may also be created by an expert.
  • a combination of these two variants may be useful.
  • simple rules can be created automatically by the software, while more complex rules are created by an expert.
  • Due to the learning ability of the field device according to the invention its diagnostic function is constantly being improved based on experiences made during the execution of maintenance work. This improves the intelligence of the entire fieldbus network over time. Particularly in the case of new problems, new errors, changed process conditions, newly developed field devices, etc., it is no longer so often necessary to carry out time-consuming updates of the diagnostic service programs and the diagnostic functions of the field devices.
  • the field device can in future provide more detailed, higher-quality diagnostic information when the same abnormal situation occurs.
  • the knowledge system can more directly and directly indicate a possible cause of the abnormal situation and / or an instruction to remedy the abnormal situation, ie, information about the error that has occurred and / or about a maintenance work to be performed, after receiving such more detailed, higher-level diagnostic information.
  • diagnostic information generated by the field device matches those contained in the relationship of the rule.
  • the field device provides additional diagnostic information about the maintenance work specified in the relationship and / or the error indicated in the relationship.
  • a feedback information regarding a maintenance work actually performed on the field device and / or with respect to an error actually occurred at the field device is transmitted to the knowledge system and the step A) of Creating a rule in the knowledge system will depend on this feedback information carried out.
  • the knowledge system is informed about the actually performed maintenance work and / or the error actually occurring at the field device so that it can correctly create the rule in step A).
  • a maintenance person is carrying a mobile, handheld device, such as a PDA (Personal Digital Assistant) during the performance of a maintenance job, it is advantageous if this feedback information is provided via the mobile , hand-portable device is transmitted to the knowledge system.
  • PDA Personal Digital Assistant
  • the knowledge system can be provided spatially separate from the parent unit.
  • the diagnostic information created can be transmitted to the knowledge system via the higher-level unit and / or via a gateway connected to the fieldbus.
  • the knowledge system and the higher-level unit are connected to one another via a communication path, wherein this arrangement is preferably designed as a client-server architecture.
  • a gateway is connected to the field bus, and the knowledge system can read via the gateway information from the fieldbus, and thus the diagnostic information transmitted to the fieldbus.
  • the rule created in the knowledge system establishes a relationship between the diagnostic information created prior to the execution of the maintenance work and an alarm level to be specified and / or triggered by the corresponding field device in the presence of this diagnostic information.
  • the alert level is particularly relevant to the priority with which the corresponding diagnostic information is handled and how quickly appropriate maintenance work is initiated to remedy the cause of the abnormal situation.
  • the relationship to the specified and / or triggered alarm level is established in dependence on a maintenance strategy.
  • the maintenance strategy is preferably predictive so that the occurrence of greater damage and / or disturbances can be avoided, or alternatively, the maintenance strategy could also be reactive, meaning that it only reacts when a failure occurs
  • Another possible maintenance strategy is a pro-active maintenance strategy, which means that maintenance work is performed in a very short time to minimize the occurrence of a failure or failure, but this maintenance strategy is costly and time consuming
  • the maintenance performed corresponds to the NAMUR recommendation NE 107. According to an advantageous development of the invention, the
  • Field device at least one of the following diagnostic functions: a statistical process monitoring SPM; a pattern recognition technology; a limit monitoring; a field device diagnostics (English: “Device Diagnostics”) and a loop diagnostics (English: “Loop Diagnostics”).
  • the learning function according to the invention can be realized, wherein the learning function is particularly advantageous in the statistical process monitoring SPM and the pattern recognition technology.
  • the field device has a function block in the form of a diagnostic block. In this case, one or more of the diagnostic functions specified above can be realized by the diagnostic block.
  • the diagnostic block is designed as an "Advanced Diagnostic Block", by means of which a statistical process monitoring SPM can be carried out and a learning function and a monitoring function can be carried out as part of a pattern recognition technology for the realization of such an "Advanced Diagnostic Block "will be equipped with sophisticated data processing and communication capabilities.
  • the communication path can be formed at least partially by the fieldbus.
  • the communication paths can be used, which have been explained above with respect to the transmission of generated diagnostic information from the field device to the knowledge system.
  • the rule may be transferred from the knowledge system to the PDA via a wireless connection. Subsequently, the rule can then be wired or wirelessly transmitted from the PDA to the field device generating the diagnosis or, if appropriate, to the higher-ranking unit that creates the diagnosis.
  • the method has the following further steps:
  • the step D) of transmission of the received rule to at least one further field device via a communication path which is wireless said wireless communication path preferably via a W-LAN, infrared, Bluetooth, HSDPA, UMTS, EDGE or GPRS is formed.
  • said wireless communication path preferably via a W-LAN, infrared, Bluetooth, HSDPA, UMTS, EDGE or GPRS is formed.
  • a wireless communication path can thus more field devices in the environment of the field device, which transmits the rule further achieved.
  • the advantage of a wireless communication path is that it does not increase the traffic on the fieldbus.
  • the communication path can also be formed by the fieldbus.
  • the transmission of the rule to the at least one further field device can also be controlled by the higher-level unit.
  • the wireless as well as the wired transmission can be carried out by broadcasting to all field devices with which the field device transmitting the rule can communicate. In this case, it is advantageous if step E) is carried out only by the field devices for which the transmitted rule is actually relevant.
  • the field device which transmits the rule can also selectively transmit the rule only to the field devices (peer-to-peer transmission), which are of the same type.
  • the knowledge system has a server which has access to at least one database, preferably to a plurality of databases, wherein the at least one database maintenance-relevant information at least to the system, the field bus, field devices connected thereto and the parent Unit comprises.
  • the attachment is generally related to a plant taken in the field devices are commonly used, such as a production plant, a tank system with multiple tanks, a chemical plant with several processes to be monitored and / or regulated, etc.
  • databases are provided externally from the server, the access can for example via a Intranet or the Internet. This is particularly advantageous in the case of the centrally provided databases described above.
  • the knowledge system preferably has access to one or more of the following maintenance-relevant information about the installation, wherein the information is preferably managed in corresponding databases: manufacturer-specific information relating to one or more of the field devices; Plant-specific information; Information relating to the digital communication over the fieldbus of the plant; Specific information regarding a process, industry and / or application.
  • individual ones of these databases can also be formed by centrally provided databases.
  • corresponding rules are also created in the centrally provided databases, by the diagnostic information generated before carrying out a maintenance work with respect to a field device and the maintenance work carried out on the relevant field device and / or with respect to the relevant field device occurred errors are related to each other.
  • a plant operator can not only benefit from the experience gained in their own plant. Rather, the rules that were created based on experience in other facilities can also be used.
  • the knowledge system has or has access to a computer-aided maintenance system, in particular a "CMMS” and / or a "PAM”.
  • CMMS computer-aided maintenance system
  • PAM PAM
  • PDA Personal Digital Assistant
  • the mobile device which can be hand-carried, can thus be used to create a network connection to the knowledge system, regardless of the current position, for example via the Internet or an intranet.
  • a wired network access is often not possible in a system for security reasons. This allows the maintenance person in a convenient and easy way to obtain additional information needed.
  • a notebook can also be used as a mobile, portable device.
  • a pocket-sized device such as the size of a PDA or a cell phone, is preferred.
  • an interactive guidance in particular an interactive query, provided by the exchange through the exchange of maintenance-relevant information between the knowledge system and the mobile, hand-portable device to be performed on the field device maintenance work and / or an error that has occurred with regard to the relevant field device can be determined.
  • This allows a maintenance person based on the situation found on site by the interactive guide, in particular by the interactive query, get the information needed in a quick and easy way and perform a required maintenance work directly.
  • Fig. 1 a schematic representation of a field device having a diagnostic block
  • FIG. 2 shows a schematic representation of a fieldbus network and a knowledge system according to a first embodiment of the invention
  • FIG. 3 shows a schematic representation of a fieldbus network and a knowledge system according to a second embodiment of the invention.
  • FIG. 4 shows a schematic representation of a fieldbus network and a knowledge system according to a third embodiment of the invention.
  • FIG. 2 shows a small fieldbus network, in which three field devices FO, F1 and F2 and a control unit PLC are connected to a fieldbus F.
  • the control unit PLC is a master, while the field devices FO, F1 and F2 are slaves.
  • the communication between the control unit PLC and the field devices FO, F1 and F2 takes place via the fieldbus F according to the corresponding fieldbus standard.
  • a knowledge system 10 is provided, which is formed in the present embodiment by a computer.
  • a computer-aided maintenance system is implemented, which in the present embodiment is formed by a CMMS 12 and a PAM 14.
  • two databases 16, 18, which are proprietary databases provided by the plant operator are integrally formed. Plant-specific information is stored in the database 16 and information relating to the digital communication via the fieldbus F of the plant is stored in the database 18.
  • a centrally provided database 20 is provided.
  • manufacturer-specific information regarding the field devices FO, F1 and F2 are stored.
  • the database 20 is provided by the manufacturer of the field devices and updated.
  • the manufacturer may provide rules each establishing a relationship between the diagnostic information generated prior to performing maintenance work on a particular field device type and the maintenance work performed on that field device type and / or the error that has occurred with respect to that field device type.
  • the knowledge system 10 can then access these rules as needed.
  • the knowledge system 10 has a server 22 that has access to the information managed by the CMMS 12, the PAM 14, as well as by the databases 16 and 18.
  • the access takes place within the knowledge system 10 via corresponding lines, which are shown schematically in Fig. 2 by the lines 24.
  • the server 22 can access the centrally provided database 20 via the Internet.
  • the corresponding Internet connection is shown schematically in FIG. 2 by the line 26.
  • the field device FO can be constructed, for example, as the field device 2 shown in FIG. Based on the diagnosis in the field device FO, the field device FO generates diagnostic information. This diagnostic information is transmitted by the field device FO to the fieldbus F to the control unit SPS.
  • the knowledge system 10 and the control unit SPS are connected to each other via a communication path 28, this arrangement preferably being designed as a client-server architecture.
  • the diagnostic information is transmitted to the knowledge system 10 via this communication path 28.
  • the computerized maintenance system 12, 14 in the knowledge system 10 informs a service person 30 that maintenance work is to be performed on the field device FO.
  • the diagnostic information provided by the field device FO is not detailed enough, so that the knowledge system 10 can not make a clear statement as to what kind of error on the field device FO has occurred and what maintenance work the maintenance person 30 must perform.
  • the maintenance person 30 next goes to the location of the
  • a hotspot system is set up in the area of the installation in which the field devices FO, F1 and F2 are located.
  • the PDA 32 has a W-LAN interface 34 through which the PDA 32 can gain access to the local W-LAN provided by the hotspot system.
  • the hotspot system has an interface 36 between the W-LAN and the Internet.
  • the wireless connection between the W-LAN interface 34 of the PDA 32 and the interface 36 is shown as a dashed line 38. Accordingly, wireless internet access is established from the PDA 32 via the hotspot system.
  • the knowledge system 10 is also connected to the Internet via a corresponding interface.
  • the Internet connection between the interface 36 and the knowledge system 10 is shown in FIG. 2 by the solid line 40.
  • the knowledge system 10 may provide interactive guidance or interrogation whereby, through the exchange of maintenance-related information between the knowledge system 10 and the mobile hand-held device 32, a maintenance work to be performed on the field device FO and / or in relation to the Field device FO occurred error can be determined.
  • the knowledge system 10 may provide a question tree that the maintenance person 30 processes at the site of the job to guide them to the desired information.
  • the maintenance person 30 Based on the information provided by the knowledge system 10, the maintenance person 30 performs a corresponding one Maintenance work by. Subsequently, the maintenance person 30 transmits via the PDA 32 feedback information to the knowledge system 10 as to whether the maintenance work specified by the knowledge system 10 and / or the specified error was correct. If the information from the knowledge system 10 was incorrect, the service person 30 inputs the actual error with respect to the field device FO and the actual maintenance work performed.
  • a rule is prepared by an appropriate software, which establishes a relationship between the diagnostic information prepared before carrying out the maintenance work with respect to the field device FO and the maintenance work performed on the field device FO and / or with respect to Field device FO produces errors.
  • the created rule is transmitted from the knowledge system 10 to the field device FO.
  • the transmission can again take place via the communication path 28, the control unit SPS and the fieldbus F.
  • the transmission can also be wireless, for example via UMTS.
  • the knowledge system 10 has a transmitter 42 and the field device FO has a corresponding receiver 44.
  • the wireless connection via UMTS is shown schematically in FIG. 2 by the dashed line 46.
  • the field device FO its diagnostic function is automatically updated on the basis of the rule obtained in such a way that information which is generally contained is taken into account when generating diagnostic information.
  • the field device F1 which is also connected to the fieldbus F, in the present embodiment of the same type as the field device FO. Accordingly, by the rule that the field device FO has received, the diagnostic function of the field device F1 can also be improved.
  • the field device FO is designed in the present case such that it can also transmit the received rule to the field device F1.
  • the transmission can take place via the fieldbus F.
  • the transmission can also be wireless, for example via UMTS.
  • FIG. the field device FO has a transmitter 48 and the field device F1 has a corresponding receiver 50.
  • the wireless connection via UMTS is shown schematically in FIG. 2 by the dashed line 52.
  • its diagnostic function is automatically updated on the basis of the rule received in such a way that information which is generally contained is taken into account when generating diagnostic information.
  • the knowledge system 10 is not connected to the control unit SPS via a communication path as in the first embodiment. Rather, a gateway 54 is connected to the fieldbus F and the knowledge system 10 reads via the gateway 54 diagnostic information that is transmitted to the fieldbus F out.
  • the field device FO is designed merely as a "simple" field device, which means that it can only perform simple diagnostic functions .
  • Field device F1 which is also connected to the field bus F, has sufficient data processing and storage capabilities to provide for the "simple" field device FO to provide supplementary diagnostic information.
  • the field device F1 reads out values which are transmitted from the "simple" field device FO to the fieldbus F and generates supplementary diagnostic information for this purpose.
  • This supplementary diagnostic information is likewise determined by the field device F1 via the fieldbus F to the control unit SPS is explained, the knowledge system 10 via the gateway 54 reads both the created by the field device FO and created by the field device F1, additional diagnostic information.
  • a service person 30 is again informed via the knowledge system 10 and sent to the field device FO on site.
  • the exchange of maintenance-relevant information with the knowledge system 10 and the determination of a maintenance work to be performed and / or an error takes place using a PDA 32, as will be explained in the first embodiment.
  • a rule is established which establishes a relationship between the diagnosis information prepared before performing the maintenance work with respect to the field device FO and the maintenance work performed on the field device FO and / or the error occurring with respect to the field device FO.
  • this rule is not transmitted to the field device FO, but to the field device F1. Accordingly, the step of automatically updating the diagnostic function is also performed in the field device F1.
  • the transmission of the rule of the knowledge system 10 to the field device F1 can be wired via the gateway 54 and the fieldbus F or wireless, for example via UMTS done.
  • the wireless transmission is again shown schematically in FIG. 3 by the transmitter 42 on the knowledge system 10, the receiver 44 on the field device F1 and the UMTS connection 46.
  • control unit PLC will generate diagnostic information regarding the field device FO.
  • diagnostic information is then transmitted from the control unit SPS (for example via the gateway 54) to the knowledge system 10.
  • the rule created in the knowledge system is in turn transmitted to the control unit SPS and the diagnostic function of the control unit SPS is updated based on the rule obtained.
  • the knowledge system 10 and the control unit SPS are integrally formed.
  • the knowledge system 10 is connected directly to the fieldbus F.
  • the transmission of diagnostic information from the field devices FO, F1 and F2 to the knowledge system 10 as well as the transmission of the rule from the knowledge system 10 to the corresponding field device can take place exclusively via the fieldbus F.
  • a wireless transmission is again possible, as shown in FIG. 4 with respect to the field device FO by the transmitter 42 on the knowledge system 10, the receiver 44 on the field device FO and the UMTS connection 46.
  • the learning function indicated in step C) is not limited to the diagnostic functions described in the present application.
  • more than one centrally provided database such as several centrally provided databases from different manufacturers, can be provided, to which the server of the knowledge system can access via an internet connection or an intranet connection.
  • the CMMS, the PAM and / or other proprietary databases provided by the plant operator may also be provided spatially separate from the knowledge system. In this case, the server of the knowledge system can access it again via an internet connection or an intranet connection.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
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  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing And Monitoring For Control Systems (AREA)

Abstract

La présente invention concerne un procédé pour améliorer une fonction diagnostic d'un appareil de terrain (F0; F1; F2), qui est relié à une unité supérieure (SPS) par un bus de terrain (F) et qui génère des informations de diagnostic relatives à l'appareil de terrain (F0; F1; F2) et/ou à au moins un autre appareil de terrain (F0; F1; F2) relié au bus de terrain. Les informations de diagnostic générées sont transmises à un système de connaissances (10). Une fois une opération de maintenance effectuée sur l'appareil de terrain (F0; F1; F2) auquel les informations de diagnostic ont été transmises, une règle est créée dans le système de connaissances (10), laquelle règle établit une relation entre les informations de diagnostic générées avant l'exécution de l'opération de maintenance et la maintenance réalisée et/ou le dysfonctionnement survenu. Ensuite, la règle est transmise par le système de connaissances (10) audit au moins un appareil de terrain (F0; F1; F2) qui a généré les informations de diagnostic. La fonction de diagnostic de l'appareil de terrain (F0; F1; F2) auquel la règle a été transmise, est sur la base de la règle dorénavant automatiquement mise à jour de telle façon que les informations contenues dans la règle sont prises en compte lors de la création des informations de diagnostic.
EP08802994A 2007-08-30 2008-08-11 Procédé d'amélioration d'une fonction diagnostic d'un appareil de terrain Withdrawn EP2183670A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710041240 DE102007041240A1 (de) 2007-08-30 2007-08-30 Verfahren zum Verbessern einer Diagnosefunktion eines Feldgerätes
PCT/EP2008/060497 WO2009027211A1 (fr) 2007-08-30 2008-08-11 Procédé d'amélioration d'une fonction diagnostic d'un appareil de terrain

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EP2183670A1 true EP2183670A1 (fr) 2010-05-12

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