JP2010146363A - System switching system of duplex programmable controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system switching system of a duplex programmable controller for generally determining an abnormal part generated on a communication network by an operation programmable controller and determining the necessity of system switching of the duplex programmable controller. <P>SOLUTION: The respective abnormal parts generated in the communication network 13 are detected in an abnormality detection part 6, an abnormality detection part 16, an abnormality detection part 12 and an abnormality detection part 17, a network state reception part 3 of the operation programmable controller 100 receives the states of respective fault parts A-F in a fixed cycle, and the states of the respective fault parts A-F are stored in a network state storage memory 4. An abnormality determination part 5 reads the contents of the network state storage memory 4 in the fixed cycle and the system is switched by the general abnormality determination. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a system switching method of a duplex programmable controller that performs system switching when a communication network abnormality occurs in a monitoring control system of a water treatment plant.

  Conventionally, a master station that performs communication control while communicating with a plurality of other stations such as slave stations via a distributed optical connection device is duplexed into an active master station and a standby master station, and the active master station is at least all other Communication control operation to send a token (special data for giving the transmission right only to the other station) by designating each station one by one, and to give the transmission right to the other station that sent the token to perform communication There is known a duplex communication system that periodically repeats and uses an optical cable as a transmission line.

  As a method of detecting a line abnormality of the duplex communication system, a transmission line abnormality detection means is provided in the operation master station, and this transmission line abnormality detection means returns no tokens continuously from all other stations, that is, token transmission. When it is later detected that there is no token return from the transmission partner station, it is determined that there is an abnormality in the transmission line including the optical cable between the active master station and all other stations, and the standby master station controls the communication system. There has been proposed a line abnormality detection method for a duplex communication system that performs system switching in order to give a right (see, for example, Patent Document 1).

JP 2000-40013 (Summary, paragraph 0001, FIG. 1)

  According to the line abnormality detection method of the duplex communication system disclosed in Patent Document 1, an abnormality in the transmission line connecting the operation master station and the distributed optical connection device is quickly detected, and the communication control right of the operation master station is determined. By immediately switching to the standby master station, there is an advantage that communication between the input / output slave station and the master station can be continued.

  However, for example, when an abnormality occurs in the distributed optical connection device, the transmission line abnormality unit detects no response from all slave stations and determines that there is an abnormality in the transmission line and communicates to the standby master station. System switching to give control right is performed. However, because the optical fiber cable of the standby master station is also connected to the distributed optical connection device, even if the communication control right is given to the standby master station, a non-response state from the slave station continues to occur and unnecessary system switching Will be doing.

  This invention was made in order to solve said subject, and the duplication programmable which determines the necessity of system switching of a duplication programmable controller by the operation programmable controller integrally judging the abnormal site | part which generate | occur | produces on a communication network The system switching system of the controller is provided.

The system switching method of the duplex programmable controller according to the present invention includes an operation programmable controller that is always in an operating state and a standby programmable that is always in a standby state and plays the role of the operation programmable controller when the operation programmable controller is abnormal. The system of the 1st communication gateway apparatus provided with a controller, the 2nd communication gateway apparatus connected to the said standby programmable controller, and the duplication programmable controller which a monitoring apparatus communicates via a communication network In the switching method, the operation programmable controller receives the abnormal part detected by the device connected to the communication network, and the occurrence state of the abnormal part is previously determined. There is a system switching condition having a system switching trigger requirement to perform system switching, and a system switching condition that disables system switching, and the occurrence state of the abnormal part includes a system switching trigger factor. When the system switching impossibility factor is not included, the system switching from the operation programmable controller to the standby programmable controller is performed.

  According to the system switching method of the duplex programmable controller according to the present invention, the operation programmable controller comprehensively determines the abnormal part of the communication network and determines whether or not the system switching is necessary, thereby enabling efficient system switching. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a system switching method for a duplex programmable controller according to the present invention will be described below with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments.

Embodiment 1 FIG.
FIG. 1 is a block diagram for explaining a system switching method of a duplex programmable controller according to Embodiment 1 of the present invention. In a communication network system to which the duplex programmable controller is connected, each abnormal part and each abnormal part occurring in the communication network are shown. This shows a detection unit.

  In FIG. 1, the operation programmable controller 100 is a programmable controller that is always in an operation state, and the standby programmable controller 101 is always in a standby state, and when the operation programmable controller 100 is abnormal, the operation programmable controller 100 plays a role. It is a programmable controller.

  The operation programmable controller 100 includes a CPU unit 1 and a communication unit 2. The CPU unit 1 includes a network state reception unit 3, a network state storage memory 4, and an abnormality determination unit 5, and the communication unit 2 includes an abnormality detection unit 6. The standby programmable controller 101 includes a CPU unit 7 and a communication unit 8. The CPU unit 7 includes a network state reception unit 9, a network state storage memory 10, and an abnormality determination unit 11, and the communication unit 8 includes an abnormality detection unit 12.

  A first communication gateway device 14 is connected between the operation programmable controller 100 and the communication network 13, and a second communication gateway device 15 is connected between the standby programmable controller 101 and the communication network 13. Has been. The first communication gateway device 14 and the second communication gateway device 15 include abnormality detection units 16 and 17, respectively. Note that a monitoring device 18 is connected to the communication network 13, and a first communication gateway device 14 connected to the operation programmable controller 100, a second communication gateway device 15 connected to the standby programmable controller 101, and a monitoring device 18 are provided. Communication is performed via the communication network 13.

Moreover, in FIG. 1, the 1st abnormality site | part A shows the line abnormality of the communication network 13 detected by the abnormality detection part 16 of the 1st communication gateway apparatus 14, and the 2nd abnormality site | part B is 1st communication. The abnormality of the 1st communication gateway apparatus 14 detected by the abnormality detection part 16 of the gateway apparatus 14 is shown. The third abnormal part C indicates a disconnection of the communication cable connecting the first communication gateway device 14 detected by the abnormality detection unit 6 of the communication unit 2 and the communication unit 2, and the fourth abnormal part D is The abnormality of the communication unit 2 detected by the abnormality detection unit 6 of the communication unit 2 is shown.

  Further, the fifth abnormal portion E indicates an abnormality of the second communication gateway device 15 detected by the abnormality detection unit 17 of the second communication gateway device 15, and the sixth abnormal portion F indicates the second communication gateway. The disconnection of the communication cable connecting the second communication gateway device 15 and the communication unit 8 detected by the abnormality detection unit 17 of the device 15 is shown, and the seventh abnormal part G is detected by the abnormality detection unit 12 of the communication unit 8 This indicates an abnormality in the communication unit 8 that performs the operation.

The communication line switching method of the duplex programmable controller according to the first embodiment is configured as described above, and the operation thereof will be described next.
Each of the abnormality detection unit 16 of the first communication gateway device 14, the abnormality detection unit 6 of the communication unit 2, the abnormality detection unit 17 of the second communication gateway device 15, and the abnormality detection unit 12 of the communication unit 8 is detected. The states of abnormal parts A, B, C, D, E, F, and G are received at regular intervals by the network state receiving unit 3 of the operation programmable controller 100, and the network state receiving unit 3 stores each state in the network state storage memory 4. Stores the states of abnormal sites A, B, C, D, E, F, and G.

  The abnormality determination unit 5 reads the contents of the network state storage memory 4 storing the states of the abnormal parts A, B, C, D, E, F, and G at regular intervals, and each abnormal part A, B, C, It is determined whether or not system switching is necessary according to the conditions shown in FIG. Note that the network state reception unit 9 and the abnormality determination unit 11 of the standby programmable controller 101 are not operating because they are in a standby state.

  FIG. 2 shows the condition of whether or not system switching is required, which is performed by the abnormality determination unit 5 of the operation programmable controller 100. Is it a system switching trigger factor for each abnormal part A, B, C, D, E, F, G? "1" or "0" is used to express whether or not it is a cause of system switching impossibility. “1” means “cause”, and “0” means “no factor”.

  In FIG. 2, the first abnormal part A to the fourth abnormal part D are factors of the system switching trigger of the operation programmable controller 100, and the fifth abnormal part E to the seventh abnormal part G are operation programmable. This is a factor that disables the system switching of the controller 100.

  Next, the system switching process performed by the abnormality determination unit 5 of the operation programmable controller 100 will be described with reference to the flowchart of FIG.

  First, the contents of the network state storage memory 4 are checked to determine whether an abnormality that causes the system switching trigger shown in FIG. 2 has occurred (step S101).

  If an abnormality that causes a system switching trigger has occurred in step S101, it is next determined whether or not an abnormality that causes a system switching impossibility shown in FIG. 2 has occurred (step S102).

  In step S102, if an abnormality that causes no system switching has occurred, system switching is performed (step S103).

  If no abnormality that causes a system switching trigger has occurred in step S101, or if an abnormality that causes a system switching impossibility has occurred in step S102, system switching is not performed.

  As described above, according to the system switching method of the duplex programmable controller according to the first embodiment, the operation programmable controller 100 integrally determines the abnormality of the communication network 13 and determines whether it is necessary to switch the system. System switching is possible.

Embodiment 2. FIG.
Next, a system switching method of the duplex programmable controller according to Embodiment 2 of the present invention will be described.
FIG. 4 is a block diagram for explaining a system switching method of the duplex programmable controller according to the second embodiment. In the communication network system to which the duplex programmable controller is connected, each abnormal part generated in the communication network and each abnormal part detection unit Is shown.

  In FIG. 4, the operation programmable controller 400 is a programmable controller that is always in an operation state, and the standby programmable controller 401 is always in a standby state, and when the operation programmable controller 400 is abnormal, the operation programmable controller 400 plays a role. It is a programmable controller.

  The operation programmable controller 400 includes a CPU unit 40, a communication unit 2, and an I / O unit 41. The CPU unit 40 includes a network state reception unit 3, a network state storage memory 4, an abnormality determination unit 5, and a second gateway device abnormality detection unit 42 that detects an abnormality of the second communication gateway device 15.

  The standby programmable controller 401 includes a CPU unit 43, a communication unit 8, and an I / O unit 44. The CPU unit 43 includes a network state reception unit 9, a network state storage memory 10, an abnormality determination unit 11, and a first gateway device abnormality detection unit 45 that detects an abnormality of the first communication gateway device 14.

  Further, the second communication gateway device 15 is provided with an external contact terminal 46, and the external contact terminal 46 and the I / O unit 41 of the operation programmable controller 400 are connected by a signal line 47. Other configurations are the same as those in the first embodiment, and thus the same reference numerals are given and description thereof is omitted.

The system switching system of the duplex programmable controller according to the second embodiment is configured as described above, and performs the same operation as the system switching system of the duplex programmable controller according to the first embodiment and performs the following operation. Is.
When an abnormality occurs in the second communication gateway device 15, the abnormality of the second communication gateway device 15 that can be detected by the second communication gateway device 15, that is, the abnormality of the fifth abnormal portion E is not detected. It becomes possible. Therefore, the network state receiving unit 3 of the operation programmable controller 400 receives the fifth abnormal portion E in an indefinite state, and as a result, the abnormality determining unit 5 cannot perform system switching determination based on integrated abnormality determination.

  Therefore, in the second embodiment, when the second communication gateway device 15 is abnormal, a signal indicating that the gateway device is abnormal is connected between the external contact terminal 46 and the I / O unit 41 of the operation programmable controller 400. The operation programmable controller 400 is notified by the line 47.

That is, the I / O unit 41 of the operation programmable controller 400 receives the abnormality of the second communication gateway device 15 as an input signal, and the abnormality signal of the second communication gateway device 15 input to the I / O unit 41. Is taken in by the second gateway apparatus abnormality detection unit 42 and registered as a gateway apparatus abnormality in the network state storage memory 4.

  As described above, according to the system switching method of the duplex programmable controller according to the second embodiment, in addition to the effects of the first embodiment, the abnormal part that cannot be detected due to the abnormality of the second communication gateway device 15 is Since the abnormality of the second communication gateway device 15 is notified to the second gateway device abnormality detection unit 42 of the operation programmable controller 400, the abnormality determination unit 5 can perform integrated abnormality determination.

Embodiment 3 FIG.
Next, a system switching method of the duplex programmable controller according to Embodiment 3 of the present invention will be described.
FIG. 5 is a block diagram for explaining a system switching method of the duplex programmable controller according to the third embodiment. In the communication network system to which the duplex programmable controller is connected, each abnormal part generated in the communication network and each abnormal part detection unit Is shown.

  In FIG. 5, the operation programmable controller 500 is a programmable controller that is always in an operation state, and the standby programmable controller 501 is always in a standby state, and plays a role of the operation programmable controller 500 when the operation programmable controller 500 is abnormal. It is a programmable controller.

  The operation programmable controller 500 includes a CPU unit 40, a communication unit 2, an I / O unit 41, and a display unit 50 as a display unit. The standby programmable controller 501 includes a CPU unit 43, a communication unit 8, an I / O unit 44, and a display unit 51. Since other configurations are the same as those in the second embodiment, the same reference numerals are used and description thereof is omitted.

  The system switching method of the duplex programmable controller according to the third embodiment is configured as described above, and performs the same operation as that of the second embodiment. When the operation programmable controller 500 abnormality determination unit 5 determines that system switching is impossible, the system switching disable lamp of the display unit 50 of the operation programmable controller 500 is turned on. It should be noted that the display unit 50 is not limited to the one that turns on the system non-switchable lamp, and it is a matter of course that the display unit 50 may be a display operation such as voice notification.

  As described above, according to the system switching method of the duplex programmable controller according to the third embodiment, in addition to the effects of the second embodiment, the operation programmable controller 500 and the standby programmable controller 501 are operating as duplex communication. When the operator tries to manually switch the system, the state of the system switching disable lamp of the display unit 50 is confirmed, and the system switching operation cannot be performed while the lamp is lit. It can be confirmed, and it becomes possible to prevent troubles in plant operation.

Embodiment 4 FIG.
Next, a system switching method of the duplex programmable controller according to Embodiment 4 of the present invention will be described.
FIG. 6 is a block diagram for explaining a system switching method of the duplex programmable controller according to the fourth embodiment. In the communication network system to which the duplex programmable controller is connected, each abnormal part generated in the communication network and each abnormal part detection unit Is shown.

In FIG. 6, the operation programmable controller 600 is a programmable controller that is always in the operation state, and the standby programmable controller 601 is always in the standby state, and when the operation programmable controller 600 is abnormal, the operation programmable controller 600 plays a role. It is a programmable controller.

  The operation programmable controller 600 includes a CPU unit 60, a communication unit 2, an I / O unit 41, a display unit 50, and a system switching unit 61. The CPU unit 60 includes a network state reception unit 3, a network state storage memory 4, an abnormality determination unit 5, a second gateway device abnormality detection unit 42 that detects abnormality of the second communication gateway device 15, a system request reception unit 62, And a system disable flag 63 are provided.

  The standby programmable controller 601 includes a CPU unit 64, a communication unit 8, an I / O unit 44, and a display unit 51. The CPU unit 64 includes a network state reception unit 9, a network state storage memory 10, an abnormality determination unit 11, a first gateway device abnormality detection unit 45 that detects an abnormality of the first communication gateway device 14, and a system switching request reception unit 65. And a system switching disable flag 66 are provided. Since other configurations are the same as those in the third embodiment, the description thereof is omitted by giving the same reference numerals.

  The system switching method of the duplex programmable controller according to the fourth embodiment is configured as described above, performs the same operation as that of the third embodiment, and cannot be switched by the abnormality determination unit 5 of the operation programmable controller 600. When the condition is satisfied, the system switching disable flag 63 is turned on. When a system switching operation is performed from the system switching unit 61, a system switching signal is received by the system switching request receiving unit 62. The system switching request receiving unit 62 checks the state of the system switching disable flag 63 and The system switching process in the switching request receiving unit 62 is not performed. As described above, even when the system switching operation is erroneously performed from the system switching unit 61 while the system switching disable lamp of the display unit 50 is lit, the system switching request receiving unit 62 receives the system input from the system switching unit 61. It functions as a means for not performing system switching in response to a switching instruction, and suppresses system switching.

  As described above, according to the system switching method of the duplex programmable controller according to the fourth embodiment, in addition to the effects of the third embodiment, the system cannot be switched due to, for example, the maintenance work of the monitoring control system of the water treatment plant. Even if the operator mistakenly performs the system switching operation during the state (that is, the system switching impossibility lamp is lit), the system switching process is not performed in the program, so that the plant operation is not hindered.

Embodiment 5 FIG.
Next, a system switching method for a duplex programmable controller according to Embodiment 5 of the present invention will be described.
FIG. 7 is a block diagram for explaining a system switching method of the duplex programmable controller according to the fifth embodiment. In the communication network system to which the duplex programmable controller is connected, each abnormal part that occurs in the communication network and each abnormal part detection unit Is shown.

  In FIG. 7, the operation programmable controller 700 is a programmable controller that is always in an operation state, and includes a CPU unit 70, a communication unit 2, an I / O unit 41, a display unit 50, and a system switching unit 61. The CPU unit 70 includes a network state reception unit 3, a network state storage memory 4, an abnormality determination unit 5, a second gateway device abnormality detection unit 42 that detects an abnormality in the second communication gateway device 15, and a system switching request reception unit 62. , A system switching impossibility flag 63 and an abnormal part registration table 71 are provided.

  A third programmable controller 72 and a database device 73 are connected to the communication network 13. The eighth abnormal portion H indicates an abnormality in the third programmable controller 72, and the ninth abnormal portion I indicates an abnormality in the database device 73. Since other configurations are the same as those in the fourth embodiment, the description thereof is omitted by giving the same reference numerals.

  In the abnormal part registration table 71, as illustrated in FIG. 8, whether or not the operation programmable controller 700 is to be monitored for each abnormal part A, B, C, D, E, F, G, H, I. In addition, the operation programmable controller 700 preliminarily sets and registers the three parameter information indicating whether the system switching trigger factor or whether the system switching is impossible. The three parameter information is expressed by “1” and “0”, and the meanings of “1” and “0” are as shown in FIG.

  The system switching method of the duplex programmable controller according to the fifth embodiment is configured as described above, and performs the same operation as that of the fourth embodiment. Then, when the abnormality determination unit 5 of the operation programmable controller 700 reads the contents of the abnormal state storage memory 4 and an abnormality has occurred, the operation programmable controller 700 that is parameter information set and registered in the abnormal part registration table 71 in advance. Check whether there is an abnormality registered as a monitoring target.

  If the occurrence abnormality is a monitoring target of the operation programmable controller 700, it is next checked whether or not the occurrence abnormality is a system switching trigger factor that is parameter information preset and registered in the abnormality part registration table 71.

  If the occurrence abnormality becomes a system switching trigger factor, next, whether or not there is an abnormality that becomes a system switching impossibility factor that is parameter information preset and registered in the abnormal part registration table 71 in the occurrence abnormality. To check. When no abnormality that causes the system switching impossibility has occurred, the system is switched.

  Thus, in the system switching method of the duplex programmable controller according to the fifth embodiment, each abnormality site A, B, C, D, E, read from the abnormality state storage memory 4 by the abnormality determination unit 71 of the operation programmable controller 700 is described. For the states of F, G, H, and I, it is determined whether or not system switching is necessary according to the parameter information set and registered in advance in the abnormal part registration table 71. And since the parameter information of the abnormal part registration table 71 is preset and registered by the operation programmable controller 700, the system switching condition of the operation programmable controller 700 for each abnormal part occurring in the network can be customized externally. Thus, the system can be switched according to the application.

  The system switching system of the duplex programmable controller according to the present invention can be applied as a system switching system when an abnormality occurs in a monitoring control system of a water treatment plant, for example.

FIG. 2 is a block diagram illustrating Embodiment 1; 6 is a diagram illustrating a setting example of a system switching condition in the first embodiment. FIG. 3 is a flowchart illustrating system switching processing performed by an abnormality determination unit of the operation programmable controller in the first embodiment. FIG. 10 is a block diagram illustrating Embodiment 2. FIG. 10 is a block diagram illustrating a third embodiment. FIG. 10 is a block diagram illustrating a fourth embodiment. FIG. 10 is a block diagram illustrating a fifth embodiment. FIG. 20 is a diagram illustrating an example of setting in an abnormality registration table in the fifth embodiment. It is a figure explaining the parameter of the abnormality registration table in Embodiment 5.

Explanation of symbols

1, 7, 40, 43, 60, 64, 70 CPU unit 2, 8 Communication unit 3, 9 Network status receiving unit 4, 10 Network status storage memory 5, 11 Abnormality determining unit 6, 12, 16, 17 Abnormality detecting unit 13 communication network 14 first communication gateway device 15 second communication gateway device 18 monitoring device 41, 44 I / O unit 42 second gateway device abnormality detection unit 45 first gateway device abnormality detection unit 46 external contact terminal 47 Signal line 50, 51 Display unit 61 System switching unit 62, 65 System switching request accepting unit 63, 66 System switching impossible flag 71 Abnormal part registration table 72 Third programmable controller 74 Database device 100, 400, 500, 600, 700 operation Programmable controllers 101, 401, 5 1,601 waiting programmable controller A~I abnormal site

Claims (5)

The operation programmable controller that is always in the operation state and the standby programmable controller that is always in the standby state and plays the role of the operation programmable controller when the operation programmable controller is abnormal, and is connected to the operation programmable controller In the system switching method of the duplexed programmable controller in which the first communication gateway device, the second communication gateway device connected to the standby programmable controller, and the monitoring device communicate via the communication network,
The abnormal part detected by the device connected to the communication network is received by the operation programmable controller, and the occurrence state of the abnormal part is set and registered in advance. When the system switching condition has a system switching disable factor that disables switching, and the occurrence state of the abnormal part includes a system switching trigger factor and does not include a system switching disable factor, the operation programmable controller causes the standby A system switching method of a duplex programmable controller characterized by switching the system to a programmable controller.   The second communication gateway device includes an abnormality detection unit and an external contact terminal. When the second communication gateway device is abnormal, the abnormality detection unit detects an abnormal state of the second communication gateway device, The system switching method of the duplex programmable controller according to claim 1, wherein the operation programmable controller is notified from a contact terminal.   The display unit is provided in the operation programmable controller, and when the system switching from the operation programmable controller to the standby programmable controller is impossible, the display unit is operated. System switching method for redundant programmable controllers.   A system switching disable flag for managing whether or not system switching is not possible for the operation programmable controller, and system switching in response to a system switching instruction input from the outside when the system switching disable flag is disabled The system switching system of the duplex programmable controller according to any one of claims 1 to 3, further comprising means for not performing.   The operation programmable controller includes an abnormal part registration table in which a system switching pattern from the operation programmable controller to the standby programmable controller is set and registered, and the operation programmable controller sets the line switching pattern of the abnormal part registration table. The system switching method of the duplex programmable controller according to any one of claims 1 to 4, wherein:

Images