CN102866690B - Redundancy switching method between Redundant process control station in scattered control system - Google Patents
Redundancy switching method between Redundant process control station in scattered control system Download PDFInfo
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- CN102866690B CN102866690B CN201210344828.XA CN201210344828A CN102866690B CN 102866690 B CN102866690 B CN 102866690B CN 201210344828 A CN201210344828 A CN 201210344828A CN 102866690 B CN102866690 B CN 102866690B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
To the invention discloses in a kind of scattered control system redundancy switching method between Redundant process control station, comprise the following steps: between Redundant process control station, realize data syn-chronization by redundant network; Each process control station and engineer station are respectively connected to switch by network; The process control station being in state of activation sends heartbeat signal to the process control station being in stand-by state; Process control station sets up a system variable; This system variable data are then revised when the process control station being in state of activation performs a steering logic at every turn; The process control station being in state of activation often takes turns synchrodata to when being in the process control station of stand-by state by dedicated network, system variable data is also synchronously pass by; The process control station being in stand-by state judges whether the data of variable in synchrodata and last time receive identical, judges whether the process control station being in stand-by state activates self.The present invention can improve process control station and perform the reliability switched.
Description
Technical field
The present invention relates to the reliable implementation method of one that in scattered control system, between Redundant process control station, redundancy switches, be specifically applicable to switch between Redundant process control station in all scattered control systems realize.
Background technology
Scattered control system (distribute control system, DCS) is a kind of new control system integrating control technology, computer technology, the communication technology, network technology.It is characterized in that decentralised control and centralized management, the control task of the industrial process of complexity is distributed on several process control stations and completes, and realize centralized watch to whole production run, operation and management by communication between SCADA and each process control station.
Process control station is the CPU (central processing unit) of scattered control system (DCS), is the core component of DCS, is responsible for the computing of steering logic and the process of input signal and output order, also needs to realize the communication function between SCADA simultaneously.
Lose the supervision to procedure parameter and the control ability to technological process as process control station breaks down by causing, this may the consequence of bringing on a disaster property, has therefore all carried out Redundancy Design to process control station.A process control station is only had to be in " activation " state during normal work, another one process control station is in " for subsequent use " state, when the process control station being in " for subsequent use " state judges to be in the process control station failure of " activation " state, it rapidly by self " activation ", thus will obtain the control to field apparatus.If there is error in judgement situation, then two process control stations can be caused all to be in " activation " state, the disturbance of field apparatus will to be caused like this, bring uncertain consequence.On this basis, the process control station how judging to be in " activation " state whether true fault just becomes a gordian technique of native system, and each DCS producer takes very large energy all in this regard.Main implementation method has several as follows at present:
1. hardware interlock technology, the process control station being in " activation " state sends a DO signal to the process control station being in " for subsequent use " state, when the process control station being in " activation " state breaks down, this DO Signal Fail, when the process control station being in " for subsequent use " state monitors DO Signal Fail, then self is switched to " activation " state.The redundancy that domestic DCS producer uses the method to come between implementation procedure control station switches more, and shortcoming needs hardware supported, raised the hardware cost of process control station.
2. under the prerequisite not increasing hardware cost, part DCS producer uses software instead to realize interlock function, for Redundant process control station, data syn-chronization is necessary function, all carries out data syn-chronization by a specialized network in therefore substantially all DCS system between Redundant process control station.The process control station being in " activation " state in part DCS system uses this dedicated network to transmit " heartbeat " signal to the process control station being in " for subsequent use " state, when this process control station monitors this " heartbeat " blackout, then self is switched to " activation " state.The shortcoming of the method is when this dedicated network breaks down, and there will be two process control station and is all in " activation " state.
3. in order to avoid the generation of above-mentioned situation, part DCS system has made following amendment, as shown in Figure 1, two process control stations and SCADA system are all connected on a public exchange by a network, in the case, if the process control station being in " activation " state increases a road " heartbeat " signal by this network and sends to the process control station being in " for subsequent use " state, when the process control station being so now in " for subsequent use " state must monitor two-way " heartbeat " blackout, self could be switched to " activation " state, effectively like this avoid the fault that can produce in second method.
But for Redundant process control station, data syn-chronization is necessary function, the process control station being in " activation " state is often taken turns before logic performs, all all whole variablees must be synchronized to the process control station being in " for subsequent use " state by dedicated network, these variablees synchronously require a great deal of time, for common engineering, perform the time that data syn-chronization probably needs cost 80 milliseconds, this will reduce the real-time of process control station.For process control station, the execution cycle of real-time and process control station is also a very important index, in the occasion that some requirement of real-time is higher, more need the performance considering its real-time, on this basis, if use this dedicated network to transmit " heartbeat " signal, the real-time of process control station will be reduced.
In order to take into account reliability that redundancy switches and not reduce real-time two aspect of process control station, the present invention proposes implementation method that both a kind of software simulating " heartbeat "+" data syn-chronization " combine to ensure the real-time of the reliability that redundancy switches and maintenance process control station.
Summary of the invention
Technical matters to be solved by this invention to be to provide in a kind of scattered control system a kind of implementation method that between Redundant process control station, redundancy switches, and namely ensures the real-time of reliability that redundancy switches also keep-process control station.
For solving the problems of the technologies described above, to the invention provides in a kind of scattered control system redundancy switching method between Redundant process control station, it is characterized in that, comprise the following steps:
1) data syn-chronization is realized by a dedicated network between Redundant process control station;
2) engineer station or SCADA system are connected to switch by a network (physical form can be electricity, light two kinds), and each process control station is connected with switch simultaneously;
3) process control station being in " activation " state leads to described network and sends first via heartbeat signal (a frame traffic message) to the process control station being in " for subsequent use " state, sends the fixed cycle that the first via heartbeat signal cycle is defaulted as setting;
4) in each process control station, a system variable is set up;
5) process control station being in " activation " state often performs a steering logic and then revises described system variable data, often takes turns variable data and adds 1;
6) process control station being in " activation " state by network by often take turns synchrodata send to the process control station being in " for subsequent use " state time, comprise the second road heartbeat signal, the data by described system variable are also synchronously pass by;
7) be in the process control station receiving isochronous data of " for subsequent use " state and compare the data of system variable in synchrodata and the whether identical of last reception, if not identical, then show that the process control station being in " activation " state is working properly, be left intact;
8) if twice numerical value is identical, then check whether the process control station first via heartbeat signal being in " activation " state exists
;
9) if first via heartbeat signal disappears, be then in the process control station of " for subsequent use " state by self " activation ", thus obtain the control to field apparatus
,if first via heartbeat signal does not disappear, two-way heartbeat signal Jin You mono-tunnel fault is described, also shows that the process control station being in " activation " state is working properly simultaneously, be left intact
.
Redundancy switching method between Redundant process control station in aforesaid scattered control system, it is characterized in that: in described step 2) in, described switch is one or more, and direct-connected between each switch when switch is multiple, each switch is connected with a process control station.
Redundancy switching method between Redundant process control station in aforesaid scattered control system, is characterized in that: in described step 3), the fixed cycle is 200 milliseconds.
The beneficial effect that the present invention reaches: the invention discloses the reliable implementation method of one that in scattered control system, between Redundant process control station, redundancy switches, by means of only the whether normal condition switched as redundancy of a road " heartbeat " signal between Redundant process control station, the process control station of two " activation " state can be caused to a certain extent to exist, unpredictable consequence can be brought to process control like this.If transmit " heartbeat " signal respectively respectively by two networks, the real-time performance of process control station can be reduced to a certain extent, adopt the method applied in the present invention, both can ensure that reliability that redundancy switches also can the real-time of keep-process control station, and on software simulating also very simple.
Accompanying drawing explanation
Fig. 1 is the overall network Organization Chart of Redundant process control station of the present invention;
Fig. 2 is the structural representation that Redundant process control station Main Assistant Controller of the present invention is connected to different switch.
Embodiment
As shown in Figure 1, method of the present invention comprises the following steps:
1) data syn-chronization is realized by a dedicated network between Redundant process control station;
2) engineer station or SCADA system are connected to switch by a network (physical form can be electricity, light two kinds), and each process control station is connected with switch simultaneously;
3) process control station being in " activation " state leads to described network and sends first via heartbeat signal (a frame traffic message) to the process control station being in " for subsequent use " state, sends the fixed cycle that the first via heartbeat signal cycle is defaulted as setting;
4) in each process control station, a system variable is set up;
5) process control station being in " activation " state often performs a steering logic and then revises described system variable data, often takes turns variable data and adds 1;
6) process control station being in " activation " state by network by often take turns synchrodata send to the process control station being in " for subsequent use " state time, comprise the second road heartbeat signal, the data by described system variable are also synchronously pass by;
7) be in the process control station receiving isochronous data of " for subsequent use " state and compare the data of system variable in synchrodata and the whether identical of last reception, if not identical, then show that the process control station being in " activation " state is working properly, be left intact;
8) if twice numerical value is identical, then check whether the process control station first via heartbeat signal being in " activation " state exists
;
9) if first via heartbeat signal disappears, be then in the process control station of " for subsequent use " state by self " activation ", thus obtain the control to field apparatus
,if first via heartbeat signal does not disappear, two-way heartbeat signal Jin You mono-tunnel fault is described, also shows that the process control station being in " activation " state is working properly simultaneously, be left intact
.
Two in Redundant process control station independently have a dedicated network to realize data syn-chronization between process control station.
Two process control stations, engineer station's (SCADA system; both can share a computer usually; also different computers can be configured to respectively) all there is a network to be connected on same switch; also different switches can be connected respectively to; if when being connected to different switch, these switches need cascade.
The process control station being in " activation " state sends " heartbeat " signal to the process control station being in " for subsequent use " state by the network through switch;
The process control being in " activation " state stands in and realizes data syn-chronization to when being in the process control station of " for subsequent use " state by dedicated network, contains simulation " heartbeat " variable in synchrodata;
The process control station being in " for subsequent use " state must could perform " activation " self operation when both breaking down, thus grabs control.
Advantage of the present invention is as follows:
1) do not need to increase any hardware cost;
2) effectively avoid two process control stations caused because of redundant dedicated network failure to be all in " activation " state, grab the control to field apparatus, thus to the unpredictable consequence that process control causes.
3) effectively utilize the software function that must realize in process controller and it reasonably revised, both can ensure that reliability that redundancy switches also can the real-time of keep-process control station, and on software simulating also very simple.
technical term:
Engineer station: for industrial stokehold slip-stick artist, the generation of database, the generation of production procedure picture can be carried out, the workstation of the configuration in stepless control loop etc.
Process control station: refer to there is Intelligent Information Processing unit that top-grade computer is formed, Built In Operating System in a control system.Process control station is the CPU (central processing unit) of scattered control system (DCS), is the core component of DCS, is responsible for the computing of steering logic and the process of input signal and output order, also needs to realize the communication function between SCADA simultaneously.
IO communication process module: refer to the intermediate information crosspoint that some controllers data acquisition fastener associated with it is connected by network.
Below only with most preferred embodiment, the present invention is described further, so its not limitation of the invention, and protection scope of the present invention to be as the criterion in the content of claim to represent.
Claims (3)
1. a redundancy switching method between Redundant process control station in scattered control system, is characterized in that, comprise the following steps:
1) data syn-chronization is realized by a dedicated network between Redundant process control station;
2) engineer station or SCADA system are connected to switch by a network, and each process control station is connected with switch simultaneously;
3) process control station being in " activation " state sends first via heartbeat signal to the process control station being in " for subsequent use " state by described dedicated network, sends the fixed cycle that the first via heartbeat signal cycle is defaulted as setting;
4) in each process control station, a system variable is set up;
5) process control station being in " activation " state often performs a steering logic and then revises described system variable data, often takes turns variable data and adds 1;
6) process control station being in " activation " state by described dedicated network by often take turns synchrodata send to the process control station being in " for subsequent use " state time, comprise the second road heartbeat signal, the data by described system variable are also synchronously pass by;
7) be in the process control station receiving isochronous data of " for subsequent use " state and compare the data of system variable in synchrodata and the whether identical of last reception, if not identical, then show that the process control station being in " activation " state is working properly, be left intact;
8) if twice numerical value is identical, then check whether the process control station first via heartbeat signal being in " activation " state exists
;
9) if first via heartbeat signal disappears, be then in the process control station of " for subsequent use " state by self " activation ", thus obtain the control to field apparatus
,if first via heartbeat signal does not disappear, two-way heartbeat signal Jin You mono-tunnel fault is described, also shows that the process control station being in " activation " state is working properly simultaneously, be left intact.
2. redundancy switching method between Redundant process control station in scattered control system according to claim 1, it is characterized in that: in described step 2) in, described switch is one or more, direct-connected between each switch when switch is multiple, each switch is connected with a process control station.
3. redundancy switching method between Redundant process control station in scattered control system according to claim 1, it is characterized in that: in described step 3), the fixed cycle is 200 milliseconds.
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| CN104320311A (en) * | 2014-11-20 | 2015-01-28 | 国电南京自动化股份有限公司 | Heartbeat detection method of SCADA distribution type platform |
| CN104571040A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Construction method of control system redundancy framework |
| CN105404287B (en) * | 2015-12-27 | 2018-02-06 | 彭晔 | The control switching method of data acquisition analysis system based on heart-beat protocol |
| CN107992027B (en) * | 2017-12-13 | 2020-05-22 | 中核控制系统工程有限公司 | DCS redundant communication module switching method |
| CN109274553A (en) * | 2018-09-26 | 2019-01-25 | 北京广利核系统工程有限公司 | The self-diagnosing method and device of nuclear safe level DCS system communication |
| CN109491238B (en) * | 2018-12-12 | 2022-06-03 | 南京工程学院 | Redundancy method for controller of subway platform door control system |
| CN109739202B (en) * | 2019-02-19 | 2020-10-16 | 西门子工厂自动化工程有限公司 | Production management system |
| CN109981353B (en) * | 2019-03-06 | 2022-05-24 | 北京全路通信信号研究设计院集团有限公司 | Method and system for protecting adjacent station redundancy in frame type network communication equipment |
| CN113660150B (en) * | 2021-06-25 | 2023-01-03 | 南京国电南自维美德自动化有限公司 | Process control station access system and access method |
| CN113985823B (en) * | 2021-09-16 | 2023-12-26 | 南京国电南自维美德自动化有限公司 | Online monitoring method and system for network communication between process control stations of distributed control system |
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Address after: 210032 Jiangsu province Nanjing city Pukou high tech Zone Huidalu No. 9 Patentee after: Nanjing Guodian Nanzi 710086 Automation Co. Ltd. Address before: Nanjing City, Jiangsu province 210032 Spark Road, Pukou hi tech Development Zone No. 8 Patentee before: Nanjing Guodian Nanzi Meizhuo Control System Co.,Ltd. |