WO2006085358A1 - フィードバック制御装置 - Google Patents
フィードバック制御装置 Download PDFInfo
- Publication number
- WO2006085358A1 WO2006085358A1 PCT/JP2005/001904 JP2005001904W WO2006085358A1 WO 2006085358 A1 WO2006085358 A1 WO 2006085358A1 JP 2005001904 W JP2005001904 W JP 2005001904W WO 2006085358 A1 WO2006085358 A1 WO 2006085358A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control
- control unit
- unit
- master
- data
- 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.)
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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
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
- G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24187—Redundant processors run identical programs
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2648—Central heating
Definitions
- the present invention relates to a feedback control device, and more particularly to a feedback control device that stably controls an object to be controlled by a plurality of control units.
- a control device that controls a controlled object at the same time by a plurality of control units having the same function is conventionally known.
- an optical submarine cable network terminal device performs control using two control units having the same function for one device to be controlled.
- the terminal equipment of the optical submarine cable network uses WDM (Wavelength Division Multiplexing) technology using AWG (Array Wave-guide Grating). It is a device that multiplexes light and transmits it simultaneously through a single optical fiber, and receives the multiplexed light and demultiplexes it for each wavelength.
- WDM Widelength Division Multiplexing
- AWG Array Wave-guide Grating
- AWG is a device whose transmission wavelength varies with temperature due to the refractive index temperature dependence of quartz glass, and the wavelength to be multiplexed is selected by controlling the temperature. Therefore, it is very important to control the temperature stably.
- a conventional feedback control device used for temperature control in a terminal device of an optical submarine cable network is shown below, for example.
- FIG. 8 is a schematic block diagram showing a configuration of a conventional feedback control apparatus.
- the feedback control device 500 includes control units 510 and 520 that perform control for making the temperature of the control target device 600 (for example, a WDM device having an AWG) constant. These two control units 510 and 520 have the same function, and control data generation units 511 and 521 that generate control data for stably controlling the heater 601 by feedback control, and the control data In response to this, driving units 512 and 522 are provided to drive the heater 601 by passing a current.
- the control data generation unit 511 is a sensor that measures the temperature provided on the control target device 600 side.
- Subtracters 511a and 521a that calculate the deviation of the set temperature force of the measured temperature based on the value of the set temperature table 603 that stores the set temperature of the device 602 and the controlled device 600, and the deviation It consists of integration circuits 511b and 521b that generate control data by integration calculation.
- the drive units 512 and 522 include control drive circuits 512a and 522a, and FETs (Field-Effect Transistors) 512b and 522b.
- the control drive circuits 512 &, 522a perform PWM (Pulse Width Modulation) control to adjust the time to turn on or off the FETs 512b, 522b according to the control data from the control data generators 511, 521, and from the power supply VCC Controls the current supplied to heater 601.
- PWM Pulse Width Modulation
- both control unit 510 and control unit 520 stably control heater 601 simultaneously by feedback control when normal. If control that drives only one and drives the other when a failure occurs (for example, see Patent Document 1) is used for stable control of the heater 601, an instantaneous interruption occurs when the control is switched, and the operation of the heater 601 is unstable. It is because it will be in a state.
- Patent Document 1 Japanese Patent Laid-Open No. 6-61985 (paragraph number [0007], FIG. 1)
- the present invention has been made in view of such a point, and even if one of a plurality of control units that control a control target becomes uncontrollable, it is possible to continuously provide a highly accurate and stable system.
- An object of the present invention is to provide a feedback control device capable of performing control. Means for solving the problem
- the control target for example, heater 201
- the control object is controlled by feedback control.
- control unit 110-1 another control unit
- the control target feedback control is started based on the control data of the master control unit received immediately before, and thereafter the control data generated by itself is stored.
- Slave control unit which controls the control target (for example, the control unit 120- 1), the feedback control unit 100-1 and having a provided to.
- the master control unit (for example, control unit 110-1) generates control data for stably controlling the control target (for example, heater 201) by feedback control, and the control data is generated. Based on the control target, the control data is transmitted to another control unit (for example, control unit 120-1), and the slave control unit (for example, control unit 120-1) If the control data sent from the master control unit is received and normal control by the master control unit is impossible, the control data of the master control unit received immediately before is not controlled in the operating state. Based on the above, feedback control of the controlled object is started, and thereafter the controlled object is controlled based on the control data generated by itself.
- the master control unit generates control data for stably controlling the controlled object by feedback control, and controls the controlled object based on the control data.
- the control data is transmitted to the other control unit, and the slave control unit does not control the control target when the master control unit is in a normal operation state, receives the control data transmitted from the master control unit, and the master control unit
- normal control becomes impossible, feedback control for the control target is started based on the control data of the master control unit received immediately before, and thereafter the control target is generated based on the control data generated by itself. Control Therefore, even when the master control unit cannot perform normal control, the slave control unit can perform stable control with high accuracy continuously.
- FIG. 1 is a diagram illustrating a configuration of a feedback control device according to a first embodiment.
- FIG. 2 is a diagram for explaining the operation of the feedback control apparatus of the first embodiment when an internal failure occurs.
- FIG. 3 is a diagram for explaining the operation of the feedback control apparatus of the first embodiment when a communication error occurs.
- FIG. 4 is a diagram for explaining the operation of the feedback control device of the first embodiment when the master control unit itself is removed.
- FIG. 5 is a diagram illustrating a configuration of a feedback control device according to a second embodiment.
- FIG. 6 is a diagram showing an example of changing the offset value according to the environmental temperature.
- FIG. 7 is a diagram showing temperature fluctuation when one control unit is removed.
- FIG. 8 is a schematic block diagram showing a configuration of a conventional feedback control device.
- FIG. 1 is a diagram illustrating a configuration of the feedback control apparatus according to the first embodiment.
- the feedback control device 100-1 has two control rods 110-1 and 120-1 that control the temperature of the control target device 200.
- Control units 110-1 and 120-1 have the same circuit configuration, and control data generation units 111 and 121 that generate control data for stably controlling heater 201 by feedback control, and selector 112, respectively.
- the control data generation units 111 and 121 include subtracters ll la and 121a and integration circuits ll lb and 121b.
- the subtractor ll la, 121a calculates the deviation of the measured temperature from the set temperature.
- the integration circuits ll lb and 121b generate control data by integration based on the deviation.
- the selectors 112 and 122 transmit control data generated by the control data generation units 111 and 121 to one input terminal via the transmission / reception units 116 and 126, and control data from the other control unit. Is input to the other input terminal, and either one is selected based on the signals from the drive switching units 115 and 125 and output.
- the horse ward motion trains 13 and 123 have ⁇ U Oma ward motion circuits 113a and 123a and FETs 113b and 123b.
- the control drive circuits 113a and 123a perform PWM control that adjusts the time to turn on or off the FETs 113b and 123b according to the control data selected by the selectors 112 and 122, and are supplied from the power supply VCC to the heater 201. Control the current.
- the decoders 114 and 124 determine whether they are master slave control units or slave control units according to signals (master code or slave code) from outside the control units 110-1 and 120-1, respectively. Decode and detect. More specifically, these control units 110-1, 120-1 are configured to be individually removable from the feedback control device 100-1, for example, the control unit 110-1 is controlled by the master. When connected to a connector (not shown), a master code is input to the decoder 114 and detected as a master control unit. When connected to a connector (not shown) for a slave control unit, a slave code is input to the decoder 114 and detected as a slave control unit.
- the drive switching units 115 and 125 drive the heater 201 by the drive units 113 and 123 according to whether the control units 110-1 and 120-1 are force slave control units that are master control units. It is determined whether or not the force is permitted, and a signal to that effect is notified to the control drive circuits 113a and 123a.
- the drive switching units 115 and 125 allow the other control unit to control the heater 201 when an internal failure or a communication error occurs in the other control unit, or when the other control unit is removed. Detecting an impossible situation. Then, depending on whether or not it is the master control unit power slave control unit, it is determined whether to switch the signals output by the selectors 112 and 122 or to permit the drive units 113 and 123 to drive the heater 201 ( Details will be described later).
- the transmission / reception units 116 and 126 are generated by the control data generation units 111 and 121 by serial communication. Control data is transmitted to the other control unit, and control data of the other control unit is received.
- the control target device 200 is a WDM device that multiplexes light of different wavelengths using, for example, an AWG or demultiplexes the multiplexed light for each wavelength, and measures the temperature with the help of the heater 201. And a set temperature table 203 in which information on temperatures to be set is stored. Note that the set temperature is AWG temperature control. If the operating temperature is in the range of 0 to 65 ° C, it will be higher than that in order to demonstrate the function of the AWG, for example, in the range of 65 ° C to 80 ° C. A certain temperature is set.
- the decoders 114 and 124 detect the control unit 110-1 as a master control unit and the control unit 120-1 as a slave control unit
- the feedback control device 100-1 of the first embodiment The operation of will be described. The same operation is performed when the control unit 110-1 is detected as a slave control unit and the control unit 120-1 is detected as a master control unit.
- the drive switching unit 115 causes the selector 112 to select and output the control data generated by the control data generation unit 111. Further, the drive switching unit 115 notifies the control drive circuit 113a of a signal for permitting the drive of the heater 201. As a result, the control drive circuit 113a turns the FET 113b on or off based on the control data generated by the control data generation unit 111, and controls the current (dotted arrow in the figure) flowing through the heater 201. A temperature measured by the sensor 202 is fed back to the control data generation unit 111.
- the integration circuit 11 lb generates control data by integration calculation based on the deviation from the set temperature set in the set temperature table 203 of the measured temperature, and continues the feedback control.
- the control data calculated by the control data generation unit 111 is always transmitted to the control unit 120-1 detected as the slave control unit via the transmission / reception unit 116.
- the transmission / reception unit 126 receives the control data transmitted from the master control unit, that is, the control unit 110-1.
- the drive switching unit 125 causes the selector 122 to select control data from the master control unit, and causes the control drive circuit 123a to output the control data.
- the drive switching unit 125 notifies the control drive circuit 123a of a signal not permitting the drive of the heater 201. This The control drive circuit 123a does not operate the FET 123b.
- slave Control unit 120-1 which is a control unit, detects that normal control by control unit 110-1 has become impossible.
- FIG. 2 is a diagram for explaining the operation of the feedback control apparatus of the first embodiment when an internal failure occurs.
- an internal failure detection circuit (not shown) of the control unit 110-1 detects an internal failure, it notifies the drive switching unit 125 of the control unit 120-1 that is a slave control unit to that effect. At the same time, the drive switching unit 115 of the control unit 110-1 notifies that the drive of the heater 201 by the control drive circuit 113a is not permitted and stops the drive. On the other hand, the drive switching unit 125 of the control unit 120-1 notifies the control drive circuit 123a of a signal that permits the drive of the heater 201.
- the control of the heater 201 is started based on the control data of the control unit 110-1 received immediately before the internal failure occurs, and the control drive circuit 123a turns the FET 123b on or off, Controls the current (dotted arrow in the figure).
- the drive switching unit 125 causes the selector 122 to select the output of the control data generation unit 121, and the feedback control by the control unit 120-1 is continuously performed.
- FIG. 3 is a diagram for explaining the operation of the feedback control apparatus of the first embodiment when a communication error occurs.
- the transmission / reception unit 116 of the control unit 110-1 as the master control unit fails, a communication error occurs when control data is transmitted to the slave control unit.
- the transmission / reception unit 126 on the slave control unit side detects such a communication error and notifies the drive switching unit 125 that a communication error has occurred.
- the drive switching unit 125 causes the transmission / reception unit 126 to send a feedback notification of the communication error to the master control unit side.
- the drive switching unit 115 of the master control unit sends a signal to stop the driving of the heater 201 to the control drive circuit 113a, and the control of the heater 201 by the master control unit is stopped.
- the drive switching unit 125 on the slave control unit side sends a signal to permit the drive of the heater 201 to the control drive circuit 123a.
- the control of the heater 201 is started based on the control data of the control unit 110-1 received immediately before the occurrence of the communication error, and the control drive circuit 123a turns on or off the FET 123b and the current flowing through the heater 201 (Dotted arrow in the figure) is controlled.
- the drive switching unit 125 causes the selector 122 to select the output of the control data generation unit 121, and the feedback control by the control unit 120-1 is continuously performed.
- the drive switching unit 125 stops the driving of the heater 201 by the control drive circuit 123a. Further, the drive switching unit 125 causes the selector 122 to select control data from the transmission / reception unit 126.
- the master control unit receives the control data generated by the slave control unit immediately after recovery, starts the control of the heater 201 based on this control data, and thereafter performs its own control data generation unit 111.
- the heater 201 is feedback controlled based on the generated control data.
- FIG. 4 is a diagram for explaining the operation of the feedback control apparatus of the first embodiment when the master control unit itself is removed.
- the mounting state detection unit detects whether or not the master control unit is mounted. When the master control unit is removed, the slave control unit indicates that the master control unit is not mounted. Is notified to the drive switching unit 125 of the control unit 120-1.
- the drive switching unit 125 When this notification is received, a signal to permit the driving of the heater 201 is sent to the control drive circuit 123a. As a result, the control of the heater 201 is started based on the control data of the master control unit received immediately before the master control unit is removed, and the control drive circuit 123a turns on or off the FET 123b and the current flowing through the heater 201 (Dotted arrow in the figure) is controlled. After the control by the control unit 120-1 is started, the drive switching unit 125 causes the selector 122 to select the output of the control data generation unit 121, and the feedback control by the control unit 120-1 is continuously performed.
- a mounting state detection unit notifies the drive switching unit 125 of the slave control unit that the master control unit is mounted.
- the drive switching unit 125 stops the driving of the heater 201 by the control drive circuit 123a.
- the drive switching unit 125 causes the selector 122 to select control data from the transmission / reception unit 126. Then, an operation is performed when both the master control unit and the slave control unit described above are normal.
- the master control unit receives the control data generated by the slave control unit immediately after recovery, starts control of the heater 201 based on this control data, and thereafter the control data generated by its own control data generation unit.
- the heater 201 is feedback controlled based on the above.
- the slave control unit can start control of the heater 201 based on the control data transmitted from the master control unit immediately before. Therefore, the slave control unit can perform stable control with high accuracy continuously. In addition, even when the master control unit is restored, the control by the master control unit can be switched continuously and stably.
- FIG. 5 is a diagram illustrating a configuration of the feedback control apparatus according to the second embodiment.
- the data complementing circuit 117, 12 7 that stores an offset value in the control data between the selectors 112, 122 and the drive units 113, 123. Is different from the feedback control apparatus 100-1 of the first embodiment.
- the data complementing circuits 117 and 127 store different offset values in the control data generated according to the number of control units mounted on the feedback control device 100-2. In other words, different offset values are added to the control data when both the control units 110-2 and 120-2 are installed and when one of them is removed. For example, when the control unit 120-2 is removed during the control by the control unit 110-2, when the control unit 110-2 is removed, or when two state forces are implemented.
- the change of the offset value is switched by the drive switching units 115 and 125 that detect the mounting state of the other control units as described above.
- FIG. 6 is a diagram illustrating an example in which the offset value is changed according to the environmental temperature.
- the horizontal axis is the environmental temperature, and the vertical axis is the offset value.
- the data supplement circuits 117 and 127 are provided, and the offset value can be varied depending on the mounting state of the control units 110-2 and 120-2. As a result, the temperature of the heater 201 can be prevented from fluctuating depending on the mounting state.
- FIG. 7 is a diagram showing temperature fluctuations when one control unit is removed.
- the control unit is the master control unit
- the feedback control device 100-1 of the first embodiment that is a slave control unit
- the slave control unit can start control based on the control data of the master control unit. Therefore, temperature fluctuation can be suppressed.
- the feedback control device 100-2 of the second embodiment provided with the data complement circuits 117 and 127 that vary the offset value depending on the mounting state, temperature fluctuations can be further suppressed.
- the force described for the control for keeping the temperature of the heater constant is not limited to this, and can be applied to other control (for example, rotation control of the motor).
- other control for example, rotation control of the motor.
- the present invention is not limited to this.
- a plurality of slave control units are provided for one master control unit, and control data of the master control unit is constantly transmitted to these slave control units, but normal control by the master control unit is not possible.
- control by any slave controller may start based on the control data received just before normal control by the master controller becomes impossible.
- the present invention is suitably used for, for example, temperature control of an AWG of a terminal device of an optical submarine cable network that requires high reliability for a long period of time.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Safety Devices In Control Systems (AREA)
- Feedback Control In General (AREA)
- Control Of Temperature (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007502501A JP4519170B2 (ja) | 2005-02-09 | 2005-02-09 | フィードバック制御装置 |
| PCT/JP2005/001904 WO2006085358A1 (ja) | 2005-02-09 | 2005-02-09 | フィードバック制御装置 |
| US11/890,505 US7757115B2 (en) | 2005-02-09 | 2007-08-07 | Feedback control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2005/001904 WO2006085358A1 (ja) | 2005-02-09 | 2005-02-09 | フィードバック制御装置 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/890,505 Continuation US7757115B2 (en) | 2005-02-09 | 2007-08-07 | Feedback control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006085358A1 true WO2006085358A1 (ja) | 2006-08-17 |
Family
ID=36792933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/001904 Ceased WO2006085358A1 (ja) | 2005-02-09 | 2005-02-09 | フィードバック制御装置 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7757115B2 (ja) |
| JP (1) | JP4519170B2 (ja) |
| WO (1) | WO2006085358A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009157784A (ja) * | 2007-12-27 | 2009-07-16 | Fujitsu Ltd | ストレージシステム、ストレージシステムの制御方法、およびストレージシステムの制御装置 |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL178466A (en) * | 2005-10-21 | 2011-05-31 | Inventio Ag | Passenger transportation system, especially an escalator or moving walk |
| EP2425556B1 (en) * | 2009-04-30 | 2019-10-30 | Telefonaktiebolaget LM Ericsson (publ) | Method and apparatus for fault discovery in a passive optical network (pon) |
| DE102009060321A1 (de) * | 2009-12-23 | 2011-06-30 | Liebherr-Werk Ehingen GmbH, 89584 | Steuersystem für Baumaschinen und Verfahren zum Betrieb des Steuersystems |
| JP5590955B2 (ja) | 2010-04-26 | 2014-09-17 | ナブテスコ株式会社 | アクチュエータ制御システム |
| BE1020023A5 (nl) * | 2011-01-28 | 2013-04-02 | Niko Nv | Systeem en werkwijze voor het aansturen van producten. |
| US9494952B2 (en) * | 2011-03-31 | 2016-11-15 | Trane International Inc. | Systems and methods for controlling multiple HVAC systems |
| US8856580B2 (en) * | 2011-04-07 | 2014-10-07 | Hewlett-Packard Development Company, L.P. | Controller election |
| EP2765464A1 (de) * | 2013-02-08 | 2014-08-13 | Siemens Aktiengesellschaft | Verfahren zum Betreiben eines redundanten Automatisierungssystems |
| US11502904B2 (en) * | 2018-01-04 | 2022-11-15 | General Electric Company | Systems and methods for automatic feedback control in a distributed control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08223663A (ja) * | 1995-02-17 | 1996-08-30 | Fuji Electric Co Ltd | 遠方監視制御システム |
| JPH0962304A (ja) * | 1995-08-22 | 1997-03-07 | Hitachi Ltd | 制御装置の多重化方式 |
| JP2002215202A (ja) * | 2001-01-23 | 2002-07-31 | Fuji Electric Co Ltd | 二重化制御装置およびその異常ループ検出方法 |
| JP2004362133A (ja) * | 2003-06-03 | 2004-12-24 | Omron Corp | Plcシステムおよびそのバックアップ方法 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01287701A (ja) * | 1988-05-16 | 1989-11-20 | Toshiba Corp | ディジタルコントローラのバックアップ方式 |
| JP3066679B2 (ja) | 1992-08-07 | 2000-07-17 | 富士通株式会社 | 冗長系切替制御方式 |
| US5790775A (en) * | 1995-10-23 | 1998-08-04 | Digital Equipment Corporation | Host transparent storage controller failover/failback of SCSI targets and associated units |
| US6363497B1 (en) * | 1997-05-13 | 2002-03-26 | Micron Technology, Inc. | System for clustering software applications |
| US6006342A (en) * | 1997-12-11 | 1999-12-21 | International Business Machines Corporation | Failover and failback system for a direct access storage device |
| US6578158B1 (en) * | 1999-10-28 | 2003-06-10 | International Business Machines Corporation | Method and apparatus for providing a raid controller having transparent failover and failback |
| US6629264B1 (en) * | 2000-03-30 | 2003-09-30 | Hewlett-Packard Development Company, L.P. | Controller-based remote copy system with logical unit grouping |
| US6681339B2 (en) * | 2001-01-16 | 2004-01-20 | International Business Machines Corporation | System and method for efficient failover/failback techniques for fault-tolerant data storage system |
| JP4319017B2 (ja) * | 2003-12-02 | 2009-08-26 | 株式会社日立製作所 | ストレージシステムの制御方法、ストレージシステム、及び記憶装置 |
| US7444541B2 (en) * | 2006-06-30 | 2008-10-28 | Seagate Technology Llc | Failover and failback of write cache data in dual active controllers |
-
2005
- 2005-02-09 JP JP2007502501A patent/JP4519170B2/ja not_active Expired - Fee Related
- 2005-02-09 WO PCT/JP2005/001904 patent/WO2006085358A1/ja not_active Ceased
-
2007
- 2007-08-07 US US11/890,505 patent/US7757115B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08223663A (ja) * | 1995-02-17 | 1996-08-30 | Fuji Electric Co Ltd | 遠方監視制御システム |
| JPH0962304A (ja) * | 1995-08-22 | 1997-03-07 | Hitachi Ltd | 制御装置の多重化方式 |
| JP2002215202A (ja) * | 2001-01-23 | 2002-07-31 | Fuji Electric Co Ltd | 二重化制御装置およびその異常ループ検出方法 |
| JP2004362133A (ja) * | 2003-06-03 | 2004-12-24 | Omron Corp | Plcシステムおよびそのバックアップ方法 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009157784A (ja) * | 2007-12-27 | 2009-07-16 | Fujitsu Ltd | ストレージシステム、ストレージシステムの制御方法、およびストレージシステムの制御装置 |
| US8078335B2 (en) | 2007-12-27 | 2011-12-13 | Fujitsu Limited | Storage system, storage system control method and storage system control apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4519170B2 (ja) | 2010-08-04 |
| US7757115B2 (en) | 2010-07-13 |
| JPWO2006085358A1 (ja) | 2008-06-26 |
| US20080005256A1 (en) | 2008-01-03 |
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