WO2006035163A2 - Dispositif et procede d’analyse et de diagnostic d’un systeme - Google Patents
Dispositif et procede d’analyse et de diagnostic d’un systeme Download PDFInfo
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- WO2006035163A2 WO2006035163A2 PCT/FR2005/002400 FR2005002400W WO2006035163A2 WO 2006035163 A2 WO2006035163 A2 WO 2006035163A2 FR 2005002400 W FR2005002400 W FR 2005002400W WO 2006035163 A2 WO2006035163 A2 WO 2006035163A2
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Classifications
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- 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
- G05B23/0275—Fault isolation and identification, e.g. classify fault; estimate cause or root of failure
- G05B23/0278—Qualitative, e.g. if-then rules; Fuzzy logic; Lookup tables; Symptomatic search; FMEA
-
- 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
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0243—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model
- G05B23/0245—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model based on a qualitative model, e.g. rule based; if-then decisions
- G05B23/0248—Causal models, e.g. fault tree; digraphs; qualitative physics
Definitions
- the present invention relates to a device and a method for analyzing and diagnosing a system, particularly, but not only, in the field of industrial installations.
- the invention finds its application for industrial installations controlled by programmable logic controllers or wired logic.
- programmable logic controllers or wired logic.
- the control systems of these industrial installations comprise an input module for controlling the state of the variables associated with the sensors of the system of the piloted industrial installation, and an output module for controlling the actuators.
- the input-output modules are connected to a peripheral bus connected to a central unit delivering commands for controlling said system.
- These systems therefore generally include a program that will be called an animation program, and an operating or operating mechanism.
- the systems of the state of the art generally comprise, besides their actuation mechanism and their animation program, a diagnostic tool, which is conventionally presented in the form of a program that is adapted to each machine, integrated into the program of animation, which generally represents about 70% of the whole program.
- a diagnostic tool which is conventionally presented in the form of a program that is adapted to each machine, integrated into the program of animation, which generally represents about 70% of the whole program.
- Such a tool is therefore generally expensive, complex, and non-reusable because dedicated to a given machine.
- Solutions exist that are based on the use of standard diagnostic modules, reusable from one program to another, but generally dedicated to a given range of systems. In addition, these solutions integrate the equation of abnormal operating conditions or non-standard conditions, which renders them unusable in many cases. Indeed, these solutions are too cumbersome and the list of non-standard conditions taken into account is never exhaustive (it is easier to determine the normal operating conditions).
- the invention is based on the use of a real system model, a true virtual system, constructed by identifying groups or units that are defined by variables or variables and that include variables that directly or indirectly indirectly on these characteristic variables.
- a real system model a true virtual system, constructed by identifying groups or units that are defined by variables or variables and that include variables that directly or indirectly indirectly on these characteristic variables.
- the construction of such a model is not the subject of the present invention.
- patent FR 2,686,714 which describes a process for simulating an industrial process, based on the notion of kinematic axis and sector or range of values.
- the invention thus relates, in a first aspect, to a method of analyzing a system based on the use of a model.
- the model includes at least two variables that are distributed in one or more groups. Each of the groups is defined by one or more variables called characteristic variables, and includes, in addition to these characteristic variables, all the other variables having a direct or indirect influence on the value of at least one of the characteristic variables of the group. These latter variables are called influential variables.
- the state of the virtual system at a given time, predicted by the model is thus defined by the respective values of these variables, influential, or characteristics.
- the method of the invention based on such a model, is thus characterized in that it comprises a first step of initializing the model in a state corresponding to a given state of the system, and a second step of creating a list called discordant list, which includes the characteristic variables whose value in the system differs from that predicted by the model.
- prediction is meant both a state change prediction and a no change prediction.
- the method of the invention further comprises, for each characteristic variable of the list of discordant variables, a third processing step comprising the creation of an initial list of suspicious variables comprising the influential variables that may have generated the discordant value of the variable discordant and a step of creating a restricted list of suspicious variables by filtering the initial list of suspicious variables.
- the step of creating the list of discordant variables comprises a step of predicting by the model the state of the system from a given command, and a step of comparing the predicted state with the actual state of the system.
- the comparison indicates a difference between the two states, that is to say between the value of one or more characteristic variables in the model and the value of these characteristic variables in the real system, the latter are inserted in the list discordant variables. If not, that is, when the comparison does not indicate any difference between the two states, the variables of the model are updated to validate its state and continue the process.
- a simplified model is constructed from the initial model taking into account, in each group, only the primary influential variables and the characteristic variables, a primary influential variable being an influential variable on which no other variable of the same group does not affect.
- This model is used instead of the initial model in the step of creating the discordant variable list.
- this list of discordant variables is sorted, using a dependency graph with a partial order relationship that groups.
- the discordant variables belonging to the highest ranking group are placed in the first position, and so on.
- the step of creating the initial list of suspicious variables consists in selecting all the influential variables belonging to the group to which the discordant variable being processed belongs.
- this step of creating an initial list of suspect variables includes a pre-diagnosis to preselect a subset of suspicious variables among the influential variables belonging to the group to which the discordant variable being processed belongs.
- the step of creating the restricted list of suspicious variables consists in eliminating the suspicious variables from the initial list that either do not generate a discordant value in the model for each of the variables in the list of variables. discordant variables, or generate a discordant value in the model for at least one characteristic variable not belonging to the list of discordant variables.
- the step of creating the restricted list of suspicious variables comprises two successive filtering.
- the first filtering eliminates suspicious variables that do not generate the discordant value for the discordant variable being processed.
- the second filtering eliminates the suspect variables which either generate a discordant value for at least one other characteristic variable than the discordant variable being processed, that other characteristic variable not belonging to the list of discordant variables, or do not generate discordant value for at least one other characteristic variable than the discordant variable being processed, this other characteristic variable belonging to the discordance list.
- the method is used for the analysis of an industrial system controlled by control automata.
- the invention relates to a device for analyzing a system, based on the use of a model.
- This model includes at least two variables that are distributed in one or more groups.
- Each of the groups is defined by one or more variables called characteristic variables, and includes, in addition to these characteristic variables, all the other variables having a direct or indirect influence on the value of at least one of the characteristic variables of the group.
- These latter variables are called influential variables.
- the state of the virtual system at a given time, predicted by the model is thus defined by the respective values of these variables, influential, or characteristics.
- the device of the invention based on such a model, is thus characterized in that it comprises data storage means defining the model, processing means for implementing the model, comparison means of the state of the system predicted by the model and the state of the real system, storage means of a list of discordant characteristic variables resulting from the comparison made by the comparison means, selection means in the model of the suspect variables that may have generated value discordant of at least one discordant characteristic variable, means for filtering said initial suspicious influencing variables to obtain restricted suspicious influential variables, and means for storing said initial suspicious influencing variables and said suspect suspicious influencing variables.
- FIG. 1 schematically represents an example of a simplified industrial installation whose main element is a venom.
- FIG. 2 schematically represents the electrical relationships between the elements of the system of FIG. 1, FIG. 3a. : schematically represents the complete model of the system of FIG. 1, FIG. 3b: schematically represents the direct model, or simplified model, of the system of FIG. 1;
- FIG. 4 represents the dependency graph of the groups of the system of FIG.
- FIGS. 5a, 5b, 5c, 5d show schematically the sequence of the various stages of the process.
- FIG. 6 is a diagrammatic representation of the analysis device according to the invention.
- FIG. 1 schematically represents an example of a simplified industrial installation, the main element of which is a jack V of the single-rod type and single-acting jack type with evacuation in the open air.
- This cylinder is controlled by a solenoid valve type EV energy distributor.
- the sensor G When the cylinder is in the retracted position, or left position, the sensor G is actuated and the sensor D is not.
- the sensor D When the cylinder is in the extended position, or the right position, the sensor D is actuated and the sensor G is not.
- the system also has four pushbuttons: BPMES start push button, BPMHS turn off pushbutton, BPMEP push button, BPMHP turn off button.
- FIG. 2 diagrammatically represents the electrical relationships between the elements of the system of FIG. 1.
- the 24 volts supply supplies, via a fuse FUS1, two commands A10 and A11 coming from the control system.
- A10 and A11 are therefore outputs of the control system and inputs of the model.
- A10 controls the EMF boost relay coil via a contact of the MES commissioning relay.
- A11 controls the coil of the MES commissioning relay.
- the MEP power supply via a FUS2 fuse, powers the A100 control.
- A100 controls the solenoid valve coil EV.
- the MES commissioning supplies, via a fuse FUE1, the sensor G in the open or closed position which is connected to the input E100, and the sensor D in the open or closed position which is connected to the input E101.
- the 24-volt supply also directly supplies a power-up contact MEP, in the open or closed position connected to the input E21, and a commissioning contact MES in the open or closed position E22.
- the 24V supply is also directly connected to input E20.
- the 24V power supply via the FUE2 fuse, powers the connectors of the BPMES start-up push button, the BPMHS turn-off pushbutton, the BPMEP boost button, and the push button. power off
- BPMHP which are respectively connected to inputs E10, E11, E12 and E13.
- Figure 3a schematically shows all the elements of the system of Figure 1 and their relationship in the complete model of the system.
- This graph highlights eight groups (or kinematic axes).
- Group G1 corresponds to the 24 Volt power supply group
- group G2 corresponds to the BPMES commissioning push button.
- Group G3 corresponds to the BPMHS decommissioning button.
- Group G4 corresponds to the MES commissioning.
- Group G5 corresponds to the push button for powering up BPMEP.
- Group G6 is the BPMHP power off button.
- Group G7 corresponds to the MEP ramp-up.
- the group G8 corresponds to the cylinder itself with the EV solenoid valve.
- control system input variables respectively associated with the BPMES start-up push button, the BPMHS turn-off button, the power-up pushbutton
- FIG. 4 represents a dependency graph organizing the groups G1 to G8 of the system of FIG. 1, with which a partial order relation is associated.
- the graph can be read as follows: G1 is upstream of G2, G3, G4, G5, and G6; G4 is upstream of G7 which is upstream of G8.
- the expression "is upstream of " could be replaced by the expression "influences”. It is clear from this example that the relation is a partial order relation since G2, G3, G4, G5 and G6 are at the same level.
- step 1 of the method of the invention consists in initializing the model in a state corresponding to a given state of the system.
- a given system state is characterized by the values of the characteristic variables of the system.
- Step 2 consists in creating a list of discordant variables in which the characteristic variables whose value in the system differs from those predicted by the model are inserted or the value predicted by the model is incoherent with respect to the system state. This step 2 will be explained in more detail later with reference to FIG. 5b.
- the list of discordant variables is sorted according to the dependency graph which links the groups with a partial order relation, as described above with reference to the example of FIG. 1 and FIG. 4.
- a discordant variable belonging to the most upstream group will be placed at the top of the list, and so on.
- step 3 is a step of creating an initial list of suspicious variables.
- These suspect influential variables are influential variables potentially responsible for the discordant value of the discordant variable being processed.
- these variables will be all influential variables , belonging to the group to which the discordant characteristic variable being processed in the loop of step 3 belongs. Also preferably, but not necessarily, this step
- the second step 32 is a step of creating a list Restricting suspicious variables by filtering the initial list of suspicious variables, At the end of this repeated processing step for each of the characteristic variables of the list of discordant variables, we obtain in step 4 a list of the managers of the Discrepancies found in Step 2. Ideally this list is reduced to a single element, which allows to diagnose a problem efficiently and quickly.
- Step 2 comprises a step 21 of prediction by the model of the state of the system from a given command or event.
- This step 21 is followed by a step 22 of comparing the state predicted by the model with the actual state of the system.
- Step 22 results in conditional branching 23 to step 231 or step 232.
- step 231 is implemented to insert the one or more discordant characteristic variables. in the list of discordant variables.
- step 232 is implemented to update the model and validate its state.
- Step 231 or 232 is followed by step 3 described above with reference to Figure 5a.
- FIG. 5c provides further details on step 32 of creating a restricted list of suspect variables previously described with reference to Figure 5a.
- This step 32 includes indeed a first step 321 filtering by eliminating suspicious variables that do not generate the discordant value of the discordant variable being processed in step 3.
- This step 321 is more precisely a loop on each suspect variable.
- a step 3211 of prediction by the model of the state of the system from the change of value of the suspect variable is implemented, limited to the group of the discordant variable, therefore without propagation to the other groups, with comparison of the state of the model and the state of the real system.
- Step 3211 results in conditional branching 3212 to step 3213 or step 322.
- the suspect variable being processed in the loop enters the restricted list of suspicious variables. Otherwise (the comparison confirms the discrepancy, still present despite the change in value of the suspect variable), the suspect variable being processed in the loop does not fit into the restricted list of suspicious variables (step 3213).
- This second filtering step comprises, in loop for each suspect variable, a step 3221 of prediction by the model of the state of the system from the change of the value of the suspect variable, with propagation in all the groups in which this variable suspicious is an influential variable.
- the state predicted by the model is compared with the actual state of the system to result in the conditional branch 3222 to step 3223 or the second conditional branch 3224.
- the suspect variable is removed from the list restricted of suspect variables (step 3223). Otherwise, that is, if the comparison does not indicate a discordant value for any other characteristic variable than the discordant characteristic variable being processed in step 3 and yet present in the discordant list of variables a second test is performed at conditional branch 3224 to step 3225 or the end of the loop.
- the suspect variable exits the restricted list of suspicious variables (step 3225). Otherwise, it is not eliminated and therefore remains in the restricted list of suspect variables issued in final step 4.
- step 32 of creating a restricted list of suspicious variables by filtering the initial list of suspicious variables is not limiting of the invention but simply an optimization. This division is based on the idea that one can initially perform the filtering with respect to the discordant variable being processed in step 3, to arrive at a first reduction of the list of suspects. this allows then to implement the second filtering step 322 with respect to all other discordant characteristic variables from a list of small size suspects.
- an additional localized investigation step is implemented. This step may for example be based on information provided by an operator and hierarchical.
- a new step is implemented which consists of checking whether a new discordant characteristic variable has occurred, and whether yes, to implement an additional filtering step to eliminate all suspect influential variables from the restricted list of suspicious variables that do not generate the discordant value of this new discordant characteristic variable.
- This filtering proceeds from the same principle as the different filtering described above.
- step 2 of creating the list of discordant variables we do not use the complete model but the simplified model described above.
- the model is thus initialized, in step 1 of FIG. 5a, in the current state of the real system described above.
- Step 2 of Figure 5a, and as detailed in Figure 5b, is then implemented.
- the command A100 is received, that is to say the control of the solenoid valve to get out the cylinder.
- the direct model therefore predicts, in step 21 of FIG. 5b, the immediate output of the jack, and therefore the release of G.
- E22 concerns the group G4 or group MES (or else axis MES), and E21 relates to the group G7 , or MEP group (or MEP axis).
- the list of discordant variables containing E22 and E21 is preferably sorted with respect to the dependency graph of FIG. 4: G4 is upstream of G7 (MES is upstream of MEP), therefore E22 is at the top of the list.
- step 31 of Figure 5a the complete model (which integrates all intermediate influential variables) indicates that in group G4, the suspects are: 24V, MES contact, MES coil, and FUS1 fuse .
- the influence of each of these suspects will therefore be analyzed, modifying one by one their value in the model, during step 32 of Figure 5a. More precisely, this step 32 is subdivided into a step 321 and a step 322.
- step 321 is implemented, on each previously identified suspect, to determine which of these suspects is responsible for potential in the occurrence of the discrepancy value being processed in step 3 (here E22) is confirmed, and thus will be kept in the list of suspects.
- Step 3211 is implemented for the suspect 24V: this one is at
- Step 3213 is implemented for the suspect contact MES: it is at 1 in the model, so we will change its value and put it The obvious consequence from the model is that E22 goes to 0. Again, this change on the MES contact confirms the discrepancy.
- the contact MES is kept as suspect (step 3213).
- Step 3211 is implemented for the suspicious coil MES: MES is 1 in the model, so we change its value to 0, which implies that the contact MES goes to 0, and so again that E22 goes to 0
- the suspect MES coil is kept (step 3213).
- step 3211 The last suspect on the original suspects list is the FUS1 fuse, on which step 3211 is implemented: FUS1 is at 1 (correct operating state) in the model, so we will now consider it defective and place it This implies that the MES coil goes to 0, then the MES contact goes to 0, and finally E22 goes to 0. Again, the discrepancy on E22 is confirmed, so FUS1 is kept in the list of suspects (step 3213).
- the next step will therefore be to filter again the list of suspects (step 322 of Figure 5d, loop on the list of suspects), not focusing only G4 group but also to other groups. This step is therefore to propagate the value changes to other groups.
- the suspect 24V is taken back, and the consequences of his disappearance extended to the other groups are examined.
- 24V goes to 0 (so E20, E21 and E22 go to 0), and EV, MEP, MES go to 0 without any immediate change in the values of the characteristic variables.
- Step 3223 is not implemented since the comparison does not indicate discordance disappearance (E21 and E22 discordant are well predicted).
- E20 is equal to 1, and the discrepancy on E20 has not been recorded in the list of discordant variables.
- 24V is removed from the list of suspects and will not be included in the shortlist of suspects, in accordance with the conduct of step 3225.
- the method of the invention indicates that it is now necessary to restart the processing on the second variable of the list of discordant variables, E21 (main loop on the processing step 3 of Figure 5a).
- this step applied to the discordant characteristic variable E21, since it is in all respects similar to that just described for E22, and the results are unchanged: the relay MES (coil and contact) and possibly the fuse FUS1 are kept as suspects.
- the list is thus reduced to a single element, hence the uselessness of any sorting.
- the unique discrepancy is therefore treated in step 3 of Figure 5a (a loop will of course not be necessary).
- the suspects belonging to the G8 group in which E101 is located are identified in step 31 of Figure 5a: the MES relay is the first suspect but it is not kept in this initial list of suspicious variables because it is upstream in the dependency graph of Figure 4 and should therefore have been processed before (if it were at 0, there would be a discrepancy in G4, already treated according to the hierarchy of the dependency graph); same remark for the MEP relay; the other suspects are the FUE1 fuse, the D sensor, the FUS2 fuse, the cylinder itself which can be stuck.
- Step 32 of FIG. 5a is therefore implemented, starting with loop 321 of FIG. 5c on each of the suspects.
- This is a new discordance (or a new discordant event) that does not belong to the list of discordant variables.
- This change on FUS2 has resulted in the appearance of a new discordance. FUS2 is therefore not kept in the suspect list (step 3213 is not implemented).
- step 3221 the case of the D sensor is considered, which results in the disappearance of D.
- the discordance previously detected is confirmed, and no new discordance appears.
- step 3223 nor step 3225 are implemented.
- the D sensor remains in the short list of suspects. The same is true of the jammed jack.
- FUS2 is therefore kept in the short list of suspects.
- FIG. 6 diagrammatically represents an analysis device according to the invention, which makes it possible to implement the method of the invention described above.
- the device thus comprises data storage means 10 which define the model of the actual system 60 that is to be analyzed.
- the device also comprises processing means 15 which allow the implementation of the model, and means 20 for comparing the state of the system predicted by the model and the state of the actual system. These means 20 and 15 communicate with the real system via a conventional communication interface.
- the comparison means 20 provides a list of discordant characteristic variables that is stored by the storage means 25.
- the device also includes means 30 for selecting, in the model, suspicious influencing variables that may have generated the discordant value of at least a discordant characteristic variable.
- the device further comprises means 40 for filtering the suspect influential variables selected by the selection means 30, which make it possible to obtain the suspect influential variables in a restricted number.
- the initial suspicious influencing variables, and the suspect influencing variables in a restricted number after filtering by the filtering means 40, are respectively stored by the storage means 35 and 45.
- the method of the invention implemented by such a device, can therefore advantageously be used for the analysis of an industrial system controlled by control automata.
- the method for obtaining the model used as a basis for implementation of the process of the invention is not limiting of the invention. Any method (adaptation of a known model, principle of learning, ...) that leads to a model defined by characteristic variables and influential variables, all of these variables being distributed in one or more groups, can be used.
Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2581681A CA2581681C (fr) | 2004-09-28 | 2005-09-28 | Dispositif et procede d'analyse et de diagnostic d'un systeme |
EP05807805.6A EP1794685B1 (fr) | 2004-09-28 | 2005-09-28 | Dispositif et procede d'analyse et de diagnostic d'un systeme |
US11/576,071 US8037005B2 (en) | 2004-09-28 | 2005-09-28 | Device and method for a system analysis and diagnosis |
ES05807805.6T ES2575513T3 (es) | 2004-09-28 | 2005-09-28 | Dispositivo y procedimiento de análisis y de diagnóstico de un sistema |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0410271A FR2875931B1 (fr) | 2004-09-28 | 2004-09-28 | Dispositif et procede d'analyse et de diagnostic d'un system e |
FR0410271 | 2004-09-28 |
Publications (3)
Publication Number | Publication Date |
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WO2006035163A2 true WO2006035163A2 (fr) | 2006-04-06 |
WO2006035163A3 WO2006035163A3 (fr) | 2006-06-22 |
WO2006035163A8 WO2006035163A8 (fr) | 2007-04-26 |
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PCT/FR2005/002400 WO2006035163A2 (fr) | 2004-09-28 | 2005-09-28 | Dispositif et procede d’analyse et de diagnostic d’un systeme |
Country Status (6)
Country | Link |
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US (1) | US8037005B2 (fr) |
EP (1) | EP1794685B1 (fr) |
CA (1) | CA2581681C (fr) |
ES (1) | ES2575513T3 (fr) |
FR (1) | FR2875931B1 (fr) |
WO (1) | WO2006035163A2 (fr) |
Families Citing this family (1)
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US8144442B1 (en) * | 2008-07-03 | 2012-03-27 | Google Inc. | Power protection in a multi-level power hierarchy |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4616308A (en) * | 1983-11-15 | 1986-10-07 | Shell Oil Company | Dynamic process control |
US5079731A (en) * | 1989-10-17 | 1992-01-07 | Alcon Laboratories, Inc. | Method and apparatus for process control validation |
US5752008A (en) * | 1996-05-28 | 1998-05-12 | Fisher-Rosemount Systems, Inc. | Real-time process control simulation method and apparatus |
US5818736A (en) * | 1996-10-01 | 1998-10-06 | Honeywell Inc. | System and method for simulating signal flow through a logic block pattern of a real time process control system |
US6336085B1 (en) * | 1997-11-10 | 2002-01-01 | Japan Nuclear Cycle Development Institute | Simulation method of extraction system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2686714B1 (fr) | 1992-01-24 | 1994-04-29 | Prosyst Sa | Procede de simulation d'un processus industriel et utilisation pour tester le fonctionnement d'un automatisme. |
US6865509B1 (en) * | 2000-03-10 | 2005-03-08 | Smiths Detection - Pasadena, Inc. | System for providing control to an industrial process using one or more multidimensional variables |
-
2004
- 2004-09-28 FR FR0410271A patent/FR2875931B1/fr active Active
-
2005
- 2005-09-28 EP EP05807805.6A patent/EP1794685B1/fr active Active
- 2005-09-28 WO PCT/FR2005/002400 patent/WO2006035163A2/fr active Application Filing
- 2005-09-28 CA CA2581681A patent/CA2581681C/fr active Active
- 2005-09-28 US US11/576,071 patent/US8037005B2/en active Active
- 2005-09-28 ES ES05807805.6T patent/ES2575513T3/es active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4616308A (en) * | 1983-11-15 | 1986-10-07 | Shell Oil Company | Dynamic process control |
US5079731A (en) * | 1989-10-17 | 1992-01-07 | Alcon Laboratories, Inc. | Method and apparatus for process control validation |
US5752008A (en) * | 1996-05-28 | 1998-05-12 | Fisher-Rosemount Systems, Inc. | Real-time process control simulation method and apparatus |
US5818736A (en) * | 1996-10-01 | 1998-10-06 | Honeywell Inc. | System and method for simulating signal flow through a logic block pattern of a real time process control system |
US6336085B1 (en) * | 1997-11-10 | 2002-01-01 | Japan Nuclear Cycle Development Institute | Simulation method of extraction system |
Also Published As
Publication number | Publication date |
---|---|
ES2575513T3 (es) | 2016-06-29 |
EP1794685A2 (fr) | 2007-06-13 |
US8037005B2 (en) | 2011-10-11 |
WO2006035163A3 (fr) | 2006-06-22 |
CA2581681A1 (fr) | 2006-04-06 |
EP1794685B1 (fr) | 2016-03-16 |
CA2581681C (fr) | 2016-04-12 |
WO2006035163A8 (fr) | 2007-04-26 |
FR2875931B1 (fr) | 2006-12-29 |
FR2875931A1 (fr) | 2006-03-31 |
US20080086288A1 (en) | 2008-04-10 |
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