TWI567547B - Redundancy system and communication unit - Google Patents

Description

Redundant system and communication unit

The present invention relates to: a first system including a control system unit and a first communication unit; a second communication unit including a second communication unit connected to the first communication unit, as a second system of the first system; connected to the first a plurality of slave communication units of the communication unit and the second communication unit; and a redundancy system and a communication unit formed by connecting to a user device of the first system.

In the prior art, there is a type in which a communication controller is switched from a control system to a standby system in a dual-programmable controller, and a programmable controller that is a standby system is operated by using a new control system. A method of continuing communication (see, for example, Patent Document 1).

There is also a system switching between the dual-programmable controllers, in the case where the detected communication abnormality satisfies the system switching trigger requirement, and there is no system non-switchable reason, the system is operated from the normal state. A method of switching the programmable controller to a standby programmable controller that is normally in a standby state (see, for example, Patent Document 2).

[Previous Technical Literature] (Patent Literature)

(Patent Document 1) Japanese Patent Laid-Open Publication No. 2009-217358

(Patent Document 2) Japanese Patent Laid-Open Publication No. 2010-146363

In the above prior art, a dedicated control program corresponding to the programmable controller is used to detect a communication abnormality with a specific communication unit, and the system is switched on the premise of the detection of the communication abnormality. However, this dedicated control program has a large workload burden for writing and fixing.

The present invention has been made in view of the above problems, and an object thereof is to provide a redundancy system and a communication unit that can easily realize system switching on the premise of detecting a communication abnormality with a specific communication unit.

In order to achieve the above object, the present invention provides a redundancy system including a first control device, a second control device connected to the first control device and serving as a preliminary device of the first control device, and connected to a redundancy system comprising a plurality of slave communication units of the first control device and the second control device, wherein the first control device includes a memory unit and a control unit, wherein the memory unit stores a parameter and Data for survival confirmation of a plurality of slave communication units, wherein the parameters are included for communication from a plurality of slave systems Specifically, the information of the monitoring target unit that is the monitoring target of the communication abnormality is specified, and the control unit determines that there is a survival unconfirmed unit among the plurality of dependent communication units based on the survival confirmation data (refer to whether or not the survival is not confirmed. The unit is present, and it is determined that the survival unconfirmed unit is the monitoring target unit based on the parameter, and the system switching from the first control device to the second control device is performed.

In order to achieve the above object, the present invention provides a redundancy system including a first system including a control system unit and a first communication unit, and a second communication including the first communication unit. a second system that is a standby device of the first system, and a redundant system that is connected to the plurality of slave communication units of the first communication unit and the second communication unit, wherein the first communication unit is provided with a memory unit and a control unit, wherein the memory unit is a memory parameter and a survival confirmation data sequentially transmitted from the plurality of slave communication units, wherein the parameter is included to specifically specify from among the plurality of slave communication units The information of the monitoring target unit to be monitored by the communication abnormality, and the control unit determines whether or not the survival of the plurality of slave communication units that has not been received for a certain period of time or more is not confirmed based on the survival confirmation data. Unit, and in the case where the judgment result has a survival unconfirmed unit, refer to the aforementioned parameters to determine the Unacknowledged monitoring target unit is a unit for the survival of the cell monitoring target unit based on the determination result is not confirmed, the system is switched from the first to the second system switching system of the control system to request notification unit.

Moreover, in order to solve the above problems, the above object is achieved. The present invention provides a communication unit that is mounted in a communication unit in a redundant system in which a first system and a second system as a standby system of the first system are redundantly configured, wherein the communication unit is And connected to a plurality of slave communication units in a manner of being communicable with a plurality of slave communication units connected to the first system and the second system, and having a memory unit and a control unit, the memory unit is a memory parameter, and the slave memory The survival confirmation data transmitted by each of the slave communication units, wherein the parameter includes information for specifically specifying a monitoring target unit that is a monitoring target of the communication abnormality among the plurality of slave communication units, the control unit According to the survival confirmation data, it is determined whether or not there is a survival unacknowledgment unit that has not confirmed the survival of the plurality of slave communication units, and if there is a survival unconfirmed unit in the determination result, the above parameters are referred to. , determining whether the survival unconfirmed unit is a monitoring target unit, and the result of the determination is that the survival is not confirmed Based units where the monitoring target unit, decide to handover from the first system to the second system switching system.

According to the present invention, system switching on the premise of detection of a communication abnormality with a specific communication unit can be easily realized.

1‧‧‧User device

1a, 11a, 13a‧‧‧ microprocessor

1b, 11b, 13b‧‧‧ memory unit

1c‧‧‧ display

1d, 11c, 12c, 13c‧‧‧ bus interface

5‧‧‧ parameters

10‧‧‧Main system

11‧‧‧Programmable controller

12‧‧‧Tracking communication unit

12b‧‧‧ Tracking memory

13‧‧‧Main communication unit

13d‧‧‧Internet interface

20‧‧‧Sub-master system

20a, 30a, 40a, 50a, ‧ ‧ survival confirmation data

21‧‧‧Programmable controller

22‧‧‧Tracking communication unit

23‧‧‧Sub-master communication unit

30‧‧‧Regional system

31‧‧‧Programmable Controller

32‧‧‧Communication unit

40‧‧‧Regional system

41‧‧‧Programmable controller

42‧‧‧Communication unit

50‧‧‧Regional system

51‧‧‧Programmable controller

52‧‧‧Communication unit

60‧‧‧ parameter setting screen

61 to 66‧‧‧ setting items

100‧‧‧Network

200a, 200b‧‧‧ cable

1000‧‧‧Redundant system

D1‧‧‧System switching decision program

D2‧‧‧ parameters

D3‧‧‧ Survival confirmation data

D4‧‧‧System switching information

D5‧‧‧ parameter setting program

Fig. 1 is a schematic view showing a schematic configuration of a redundant system of the first embodiment.

Fig. 2 is a view showing an example of a parameter setting screen set by the user device in the first embodiment.

Fig. 3 is a view showing an example of the internal configuration of a device included in the redundancy system of the first embodiment.

Fig. 4 is a view showing the flow of processing of the redundancy system of the first embodiment.

Fig. 5 is a view showing an example of a position where a communication obstacle occurs.

Fig. 6 is a view showing an example of the configuration of parameters set by the user device in the second embodiment.

Fig. 7 is a flow chart showing the flow of processing of the master communication unit in the second embodiment.

Fig. 8 is a view showing the flow of processing of the redundancy system of the third embodiment.

Fig. 9 is a view showing an example of the configuration of the diagnostic information screen in the third embodiment.

Embodiment 1.

Hereinafter, embodiments of the redundancy system and communication unit of the present invention will be described with reference to the drawings. However, the invention is not limited by the embodiment.

Fig. 1 is a schematic view showing a schematic configuration of a redundancy system 1000 according to the first embodiment. As shown in Fig. 1, the redundant system 1000 of the first embodiment has a sub-master system (sub master) belonging to the standby system using the master system 10 belonging to the control system and the preparatory device as the master system 10. System)20 is a redundant structure made up of two. The redundancy system 1000 of the first embodiment may also include a straight line connection. The network unit is configured to include a network unit that is a linear connection and a network unit that is a star connection.

Further, as shown in FIG. 1, the redundancy system 1000 of the first embodiment further includes a local system 30, a regional system 40, and a regional system 50 connected to the main system 10 and the sub-master system 20, and connected to The user device 1 of the main system 10 is configured.

The main system 10 includes: a programmable controller 11 that receives various inputs and controls the operation of the connected device according to predetermined conditions; and synchronizes the control information with the sub-master system 20 belonging to the standby system. The tracking communication unit 12 and the master communication unit 13 that controls communication with the area system 30, the area system 40, and the area system 50 are configured. The main system 10 is an example of the first system. The programmable controller 11 is an example of a control system unit. The main communication unit 13 is an example of the first communication unit.

The sub-master system 20 includes a programmable controller 21 that receives various inputs and controls the operation of the connected device according to predetermined conditions; and synchronizes the control information with the host system 10 belonging to the control system. The tracking communication unit 22 and a sub-master communication unit 23 that controls communication with the area system 30, the area system 40, and the area system 50 are configured. The sub-master system 20 is an example of the second system. The sub-master communication unit 23 is an example of the second communication unit.

The area system 30 includes: a programmable controller 31 that takes in various inputs and controls the operation of the connected machine in accordance with predetermined conditions; and controls communication with the main system 10 or the sub-master system 20 The communication unit 32 is configured. The area system 40 includes a programmable controller 41 that receives various inputs and controls the operation of the connected machine in accordance with predetermined conditions; and a communication unit 42 that controls communication with the main system 10 or the sub-master system 20 And constitute. The area system 50 includes a programmable controller 51 that receives various inputs and controls the operation of the connected machine in accordance with predetermined conditions; and a communication unit 52 that controls communication with the main system 10 or the sub-master system 20 And constitute. The communication unit 32, the communication unit 42, and the communication unit 52 are connected to the main communication unit 13 and the sub-master communication unit 23. The communication unit 32, the communication unit 42, and the communication unit 52 are examples of the slave communication unit.

The main communication unit 13 and the sub-master communication unit 23 respectively hold the parameter 5 set by the user in the user device 1. The parameter 5 includes information for specifically designating a monitoring target unit to be monitored as a communication abnormality from the communication unit 32, the communication unit 42, and the communication unit 52, operation setting information of each communication unit, and a communication area. The scope. The programmable controller 11 downloads the parameter 5 set by the user at the user device 1 and transfers it to the main communication unit 13. The main communication unit 13 saves the parameter 5 transferred from the programmable controller 11. The main communication unit 13 forwards the parameter 5 to the sub-master communication unit 23 via the network. The sub-master communication unit 23 saves the parameter 5 transferred from the main communication unit 13. The tracking communication unit 12 and the tracking communication unit 22 perform tracking communication for synchronizing the control information of the programmable controller 11 with the control information of the programmable controller 21.

Also, as shown in Fig. 1, the main system 10 is separately from communication The unit 32, the communication unit 42, and the communication unit 52 receive the survival confirmation data 30a, the survival confirmation data 40a, and the survival confirmation data 50a for knowing that the communication unit is in a communicable state. The communication unit 32, the communication unit 42, and the communication unit 52 sequentially transmit the survival confirmation data 30a, the survival confirmation data 40a, and the survival confirmation by the transmission timing set by the own office (the system or device in which the user is located). Information 50a. The communication unit 32, the communication unit 42, and the communication unit 52 separately transmit the survival confirmation data 30a, the survival confirmation data 40a, and the survival confirmation data 50a in addition to the control data. In the example shown in the first embodiment, the sub-master communication unit 23 transmits the survival confirmation data 20a to the main communication unit 13 in the same manner as the communication unit 32, the communication unit 42, and the communication unit 52.

Fig. 2 is a view showing an example of a parameter setting screen set by the user device in the first embodiment. The user device 1 displays the parameter setting screen 60 necessary for setting the parameter 5. The parameter setting screen 60 includes a setting item 61 for setting the number of communication units included in the redundancy system 1000, a setting item 62 for setting the model of the communication unit, and a station number for setting the network unit. The setting item 63, the setting item 64 for setting the network unit type, the setting item 65 for setting the system switching monitoring target, and the setting item 66 for setting the monitoring priority order. In the example shown in Fig. 2, the local office of the station number "2" is set as the system switching monitoring target station.

The main office of the office number "0" shown in Fig. 2 corresponds to the main communication unit 13 shown in Fig. 1, and the regional office number of the office number "1" shown in Fig. 2 corresponds to that shown in Fig. 1. Communication unit 32, the number shown in Figure 2 The regional office of "2" corresponds to the communication unit 42 shown in Fig. 1, and the regional office of the office number "3" shown in Fig. 2 corresponds to the communication unit 52 shown in Fig. 1, and Fig. 2 The sub-master of the station number "4" corresponds to the sub-master communication unit 23 shown in Fig. 1.

Fig. 3 is a view showing an internal configuration example of a device included in the redundancy system 1000 of the first embodiment. Since the main system 10 and the sub-master system 20 basically have the same configuration, the configuration of the main system 10 will be described below as an example.

As shown in FIG. 3, the programmable controller 11 of the main system 10 is provided with a microprocessor 11a for executing processing corresponding to each control performed by the main system 10, and a memory for implementing the microprocessor. A memory unit 11b for processing various programs and data executed by 11a, and a bus interface 11c connected to an internal bus. The microprocessor 11a performs processing corresponding to each control of the main system 10. The memory unit 11b memorizes various programs and materials for realizing the processing executed by the microprocessor 11a. The memory unit 11b also utilizes a work area as a result of temporarily processing the processing performed by the microprocessor 11a. The memory unit 11b is composed of, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), a storage (storage), a pluggable memory device, or a combination of the above. The bus interface 11c is used to connect to the interface of the tracking communication unit 12 and the main communication unit 13. The busbar interface 11c is also used to connect to the interface of the user device 1 via a cable 200a.

As shown in FIG. 3, the tracking communication unit 12 is provided There are: a tracking memory 12b to be used for tracking communication, and a bus interface 12c connected to the internal bus and cable 200b. The tracking memory 12b functions as a buffer memory when communication for synchronizing the control information of the programmable controller 11 with the control information of the programmable controller 21 is performed. The bus interface 12c is used to connect to the interface of the programmable controller 11. The bus interface interface 12c is also used to connect to the interface of the tracking communication unit 22 via the cable 200b.

As shown in Fig. 3, the main communication unit 13 is provided with a microprocessor 13a that performs processing corresponding to each control performed by the main communication unit 13, and a memory for realizing the processing executed by the microprocessor 13a. The memory unit 13b of the program and data, the bus interface 13c, and the network interface 13d. The main communication unit 13 performs processing corresponding to each control by executing a program corresponding to each control using the microprocessor 13a and the memory unit 13b belonging to hardware resources. For example, the main communication unit 13 reads out the program stored in the memory unit 13b, and expands it in the work area allocated to the memory unit 13b, and causes the microprocessor 13a to execute the command contained in the expanded program. Then, the main communication unit 13 performs processing corresponding to each control in accordance with the result of the execution of the command by the microprocessor 13a.

As shown in FIG. 3, for example, the system switching determination program d1, the parameter d2, the survival confirmation data d3, and the system switching information d4 are stored in the memory unit 13b. The parameter d2 corresponds to the parameter 5 described above.

The system switching determination program d1 provides various functions described below in order to realize processing related to system switching. That is, the system is cut The change determination program d1 determines whether or not there is a survival unacknowledgment unit that has not received the confirmation of survival for a certain period of time or more among the communication unit 32, the communication unit 42, and the communication unit 52 based on the survival confirmation data d3. The system switching determination program d1 determines whether or not the survival unconfirmed unit is the monitoring target station with reference to the parameter d2 when the determination result indicates that there is a survival unacknowledged unit. The system switching determination program d1 transmits a system switching request to be switched from the main system 10 to the sub-master system 20 to the programmable controller 11 in the case where the result of the determination is that the survival unconfirmed unit is the monitoring target station. Further, the system switching determination program d1 stores the system switching information d4 related to the system switching in the memory unit 13b when it is determined that the system switching is to be performed.

The parameter d2 stored in the memory unit 13b corresponds to the parameter 5 set by the user using the user device 1. The survival confirmation data d3 stored in the memory unit 13b includes the survival confirmation data 30a, the survival confirmation data 40a, and the survival confirmation data 50a which are sequentially transmitted from the communication unit 32, the communication unit 42, and the communication unit 52. And constitute. System switching information d4 is information related to system switching. The system switching information d4 includes the implementation time of the system switching, the communication abnormality, the system switching office, and the reason for the system switching. The system switching information is stored by the microprocessor 13a.

As shown in FIG. 3, the user device 1 includes a microprocessor 1a, a memory unit 1b, a display 1c, and a bus bar interface 1d. The microprocessor 1a performs processing corresponding to each control performed by the user device 1. The memory unit 1b memorizes various programs and materials for realizing the processing executed by the microprocessor 1a. Display 1c is displayed Various information.

A parameter setting program d5 is stored in the memory unit 1b. The parameter setting program d5 provides a function for setting the parameter 5, and the parameter 5 includes information for specifically designating a monitoring target unit to be a monitoring target of the communication abnormality from the communication unit 32, the communication unit 42, and the communication unit 52. The operation setting information of each communication unit and the range of the communication area. The parameter setting program d5 allows the user to set the parameter 5 by displaying the parameter setting screen shown in Fig. 2 on the display 1c.

The flow of the process of the redundancy system 1000 of the first embodiment will be described using FIG. Fig. 4 is a view showing the flow of processing of the redundancy system 1000 of the first embodiment.

As shown in Fig. 4, the main communication unit 13 confirms the reception of the material for survival confirmation (step S11). Next, the main communication unit 13 determines whether or not there is a survival unconfirmed unit that has not received the confirmation of survival for a certain period of time or longer (step S12).

When the result of the determination is that the survival unconfirmed unit that has not received the confirmation of survival has not been received for a certain period of time or longer (the result of step S12 is "NO"), the main communication unit 13 returns to the above-described processing of step S11, and continues the survival confirmation. Confirmation by receipt of the data. On the other hand, when the result of the determination is that there is a survival unacknowledgment unit that has not confirmed the survival of the user for a certain period of time or longer (the result of step S12 is YES), it is determined whether or not the communication unit is the monitoring target. Bureau (step S13).

The main communication unit 13 determines that the survival unconfirmed unit detected in step S12 is not the monitoring target station (step S13). If the result is "NO", the process returns to the above-described step S11, and the reception confirmation of the survival confirmation data is continued. On the other hand, if the result of the determination is that the survival unacknowledgment unit detected in step S12 is the monitoring target station (YES in step S13), the main communication unit 13 transmits the system switching request to the tracking communication unit 12 and The programmable controller 11 (step S14). The system switching request transmitted from the main communication unit 13 is, for example, stored in the storage receiving area pre-allocated in the tracking memory 12b of the tracking communication unit 12 and the memory allocated in advance in the memory unit 11b of the programmable controller 11. Enter the acceptance area. The tracking communication unit 12 reads the storage receiving area of the tracking memory 12b and detects the system switching request. The programmable controller 11 reads out the deposit accepting area of the memory unit 11b and detects the system switching request.

Next, the main communication unit 13 stores the system switching information (step S15).

When the tracking communication unit 12 receives the system switching request from the main communication unit 13, the tracking communication unit 12 transmits the system switching notification to the tracking communication unit 22 of the sub-master system 20 (step S16).

When the programmable controller 11 receives the system switching request from the main communication unit 13, the system controller switches the system for changing the sub-master system 20 as the standby device from the standby state to the operating state (step S17).

When the tracking communication unit 22 receives the system switching notification from the tracking communication unit 22, the tracking communication unit 22 transmits the system switching notification to the programmable controller 21 and the sub-master communication unit 23 (step S18).

The programmable controller 21 receives from the tracking communication unit 22 Upon the system switching notification, the system switching for changing from the standby state to the operating state is performed (step S19).

As described above, in the redundancy system 1000 of the first embodiment, the main communication unit 13 automatically transmits a system switching request when detecting a communication abnormality in which the communication unit 42 as the monitoring target station is set. Therefore, according to the first embodiment, the programmable controller is executed without executing a control program for detecting a communication abnormality with the communication unit as the monitoring target station and causing the system to switch, and the programmable controller executes the dedicated control program. System switching on the premise of detection of communication anomalies with a specific communication unit can be easily realized.

Fig. 5 is a view showing an example of a position where a communication obstacle occurs. In the example shown in Fig. 5, a communication obstacle CF1 caused by a cable disconnection or the like occurs between the main system 10 and the area system 42. In this case, the main communication unit 13 does not receive the survival confirmation data 40a transmitted from the communication unit 42. Therefore, the main communication unit 13 cannot confirm whether or not the communication unit 42 as the monitoring target station is present. Therefore, it is determined that the system is to be switched, and communication with the communication unit 42 can be continued by the sub-master communication unit 23. Therefore, according to the first embodiment, the communication with the specific communication unit set as the monitoring target can be continued based on the parameter set by the user device 1.

Further, according to the first embodiment, since the processing capability of the programmable controller 11 is not used for the monitoring of the communication unit 42 as the monitoring target station, the programmable controller 11 is caused to perform the communication unit 42 as the monitoring target station. Compared with the situation of monitoring, it can be reduced The load of the program controller 11 can improve the processing capability of the entire main system 10 as a result. Further, according to the first embodiment, the main communication unit 13 stores the execution time of the system switching, the communication abnormality, the system switching office, and the cause of the system switching to the memory unit 13b in addition to the system switching request, so that the main communication unit 13 can use the same. System maintenance and troubleshooting.

Embodiment 2.

In the following second embodiment, the processing of the main communication unit 13 in the case where a plurality of communication units are set as the monitoring target station will be described.

Fig. 6 is a view showing an example of a parameter setting screen set by the user device in the second embodiment. In the second embodiment, a plurality of communication units are set as the monitoring target stations on the parameter setting screen 60. In the example shown in Fig. 6, the regional office of the office number "1" and the regional office of the office number "2" are all set as the monitoring target offices. Further, in the example shown in Fig. 6, the monitoring priority order of the regional office of the office number "2" is set to "1", and the monitoring priority order of the regional office of the office number "1" is set to "2".

The system switching determination program provides functions for performing processing corresponding to a plurality of monitoring target offices in addition to the functions described in the first embodiment. Specifically, the system switching determination program provides a method for determining whether or not there is a plurality of monitoring target stations when the survival unacknowledged unit is the monitoring target station, and determines that the monitoring priority is the highest priority when there are a plurality of monitoring stations. The object office first performs the function of system switching.

The main communication list in the second embodiment will be described using FIG. 7. The process of meta processing. Fig. 7 is a flow chart showing the flow of processing of the main communication unit in the second embodiment. The processing shown in Fig. 7 is realized by the microprocessor 13a executing the system switching program d1 stored in the memory unit 13b.

As shown in Fig. 7, the main communication unit 13 confirms the reception of the material for survival confirmation (step S101). Next, the main communication unit 13 determines whether or not there is a survival unconfirmed unit that has not received the confirmation of survival for a certain period of time or longer (step S102).

When the result of the determination is that the survival unacknowledgment unit that has not received the confirmation of survival has not been received for a certain period of time or longer (the result of step S102 is "NO"), the main communication unit 13 returns to the above-described processing of step S101, and continues the survival confirmation. Confirmation by receipt of the data. On the other hand, if the result of the determination is that the survival unacknowledgment unit that has confirmed the survival of the user for a certain period of time or longer (the result of step S102 is YES), the main communication unit 13 determines whether or not the communication unit is the monitoring target. Bureau (step S103).

When the result of the determination is that the survival unconfirmed unit detected in step S102 is not the monitoring target station (the result of step S103 is NO), the main communication unit 13 returns to the above-described processing of step S101 and continues the survival confirmation data. Receive confirmation. On the other hand, if the result of the determination is that the survival unconfirmed unit detected in step S102 is the monitoring target station (YES in step S103), the main communication unit 13 determines whether or not there is a plurality of monitoring stations. The survival unconfirmed unit (step S104). That is, the main communication unit 13 determines whether or not there are a plurality of survival unconfirmed units detected in step S102, and is also a monitoring target. Communication unit of the bureau.

When the main communication unit 13 determines that there are a plurality of communication units that are both the unsuccessful unit and the monitoring target station (YES in step S104), the main communication unit 13 transmits and monitors the monitoring target station for both the survival unacknowledged unit and the monitoring unit. The system switching request of the communication unit having the highest priority is selected (step S105), and the system switching information corresponding to the system switching request of step S105 is stored (step S106).

Next, the main communication unit 13 transmits a system switching request for the communication unit having the second highest priority of the monitoring priority (step S107), and stores the system switching information corresponding to the system switching request of step S107 (step S108).

Next, the main communication unit 13 determines whether or not there is a communication unit that requires system switching (step S109). That is, the main communication unit 13 determines whether or not all of the communication units detected by the determination of step S104 have completed the issuance of the system switching request.

When the result of the determination is that the communication unit that requires system switching is present (YES in step S109), the main communication unit 13 returns to the processing of step S107 described above. On the other hand, if the result of the determination by the main communication unit 13 is that there is no communication unit that requires system switching (the result of step S109 is "NO"), the processing shown in Fig. 7 is ended.

In the above step S104, the result of the determination by the main communication unit 13 is that there is no plural communication unit that is both the survival unacknowledged unit and the monitoring target station, that is, there is only one case (the result of step S104 is "NO"). Sending out the attribute detected in step S102 The system switching request of the communication unit of the unconfirmed unit is stored (step S110), and the system switching information is stored (step S111), and then the processing shown in Fig. 7 is ended.

As described above, according to the second embodiment, the main communication unit 13 sequentially issues a system switching request from the communication unit having the highest priority of monitoring, when there are a plurality of communication units that are both the unacknowledged unit and the monitoring target. Therefore, according to the second embodiment, a plurality of communication units can be set as the monitoring target. Further, according to the second embodiment, it is possible to sequentially return from the communication abnormality state to the communication unit having the highest priority among the plurality of communication units set as the monitoring target.

Embodiment 3.

In the following third embodiment, a description will be given of a process of displaying system switching information on the user device 1. Fig. 8 is a view showing the flow of processing of the redundancy system 1000 of the third embodiment.

As shown in FIG. 8, when the user device 1 receives the display request of the diagnostic information screen (step S51), the user device 1 transmits the system switching information acquisition request to the main system 10 (step S52).

When the programmable controller 11 of the main system 10 receives the system switching information acquisition request from the user device 1, the program switching information acquisition request is transmitted to the main communication unit 13 (step S53).

Upon receiving the request for acquiring the system switching information from the programmable controller 11, the main communication unit 13 reads the system switching information d4 from the memory unit 13b (step S54). Then, the main communication unit 13 will read in The system switching information d4 is transmitted to the programmable controller 11 (step S55).

Upon receiving the system switching information d4 from the main communication unit 13, the programmable controller 11 transmits the system switching information d4 to the user device 1 (step S56).

Upon receiving the system switching information d4 from the host system 10, the user device 1 creates diagnostic information based on the received system switching information d4, and outputs a diagnostic information screen to be displayed on the display 1c (step S57).

Fig. 9 is a view showing an example of the configuration of the diagnostic information screen in the third embodiment. As shown in FIG. 9, the diagnostic information screen 90 includes: display information for displaying the configuration information of the redundancy system 1000 when the communication abnormality occurs, and the configuration information of the current redundancy system 1000; The display area 92 in which the user operates in the display area 91 is displayed. In the example shown in FIG. 9, the display area 91 and the display area 92 are represented by a model represented by an icon (icon) indicating a communication unit and a line indicating a cable. Further, as shown in FIG. 9, the diagnostic information screen 90 has a plurality of detailed information of the communication unit corresponding to the icon selected by the user by using the popup screen 93 in the display area 91 and the display area 92. The window (multi-window) is composed. The pop-up screen 93 displays the cause of the communication abnormality of the communication unit selected by the user.

As described above, according to the third embodiment, by displaying the diagnostic information screen 90 on the user device 1, the user can be efficiently implemented in system maintenance and troubleshooting.

In the redundancy system 1000 of the above embodiment, the main communication unit 13 performs the programs corresponding to the respective controls by using the microprocessor 13a and the memory unit 13b belonging to the hardware resources. An example of controlling the corresponding processing is not limited thereto. In other words, it is also possible to use a wired logic in which a plurality of processing circuits such as an ASIC (Application Specific Integrated Circuit) and an FPGA (Field Programmable Gate Array) corresponding to the program stored in the memory unit 13b are combined. To achieve the above control.

In the above-described embodiment, the main system 10 is configured to disperse the programmable controller 11 and the main communication unit 13 functionally. However, the present invention is not limited thereto, and the programmable controller 11 may be also provided. It has the function originally realized by the main communication unit 13. In other words, the programmable controller 11 detects the communication abnormality of the communication unit 42 set as the monitoring target station and determines the execution of the system switching based on itself. The programmable controller 11 in this case is an example of the first control device. Further, the main communication unit 13 described in the above embodiment may be configured to be inserted and removed with respect to an arbitrary redundancy system that is redundant by the operation system and the standby system. The main communication unit 13 in this case is an example of a communication unit.

The configuration disclosed in the above embodiments is merely an example of the content of the present invention, and may be combined with other known techniques or may be constructed without departing from the gist of the present invention. Some are omitted or changed.

1‧‧‧User device

5‧‧‧ parameters

10‧‧‧Main system

11‧‧‧Programmable controller

12‧‧‧Tracking communication unit

13‧‧‧Main communication unit

20‧‧‧Sub-master system

20a, 30a, 40a, 50a, ‧ ‧ survival confirmation data

21‧‧‧Programmable controller

22‧‧‧Tracking communication unit

23‧‧‧Sub-master communication unit

30‧‧‧Regional system

31‧‧‧Programmable Controller

32‧‧‧Communication unit

40‧‧‧Regional system

41‧‧‧Programmable controller

42‧‧‧Communication unit

50‧‧‧Regional system

51‧‧‧Programmable controller

52‧‧‧Communication unit

1000‧‧‧Redundant system

Claims (6)

A redundancy system comprising a first control device, a second control device connected to the first control device and serving as a preliminary device of the first control device, and connected to the first control device and the second control A redundancy system comprising a plurality of slave communication units, wherein the first control device includes: a memory unit, a memory parameter, and a survival confirmation data of the plurality of slave communication units, the parameter The present invention includes information for specifically designating a monitoring target unit that is a monitoring target that is a communication abnormality among a plurality of the above-described slave communication units, and a control unit that determines a plurality of the dependent systems based on the survival confirmation data. Among the communication units, there is a survival unconfirmed unit, and it is determined that the survival unconfirmed unit is the monitoring target unit based on the parameter, and the system switching from the first control device to the second control device is performed. A redundancy system comprising a first system including a control system unit and a first communication unit, a second communication unit including a first communication unit coupled to the first communication unit, and a second preparation device as the first system a system, and a redundancy system configured by connecting a plurality of slave communication units of the first communication unit and the second communication unit, wherein the first communication unit is provided with: a memory unit, a memory parameter, and From a plurality of the aforementioned subordinate systems The survival confirmation data transmitted by the letter unit sequentially, wherein the parameter includes information for specifically specifying a monitoring target unit that is a monitoring target of the communication abnormality among the plurality of the slave communication units; and a control unit Determining, by the survival confirmation data, whether there is a survival unacknowledgment unit that has not confirmed the survival of the plurality of slave communication units for a certain period of time or more, and the existence of the survival unconfirmed unit exists in the determination result, Referring to the foregoing parameters, it is determined whether the survival unconfirmed unit is the monitoring target unit, and if the result of the determination is that the survival unacknowledged unit is the monitoring target unit, the system switching request to be switched from the first system to the second system is notified to The aforementioned control system unit. The redundancy system according to claim 2, wherein the parameter stored in the memory unit includes a monitoring priority order corresponding to the monitoring target unit, and the control unit has a plurality of the foregoing When the survival unconfirmed unit and each of the plurality of survival unconfirmed units are the monitoring target units, determining the system switching from the monitoring target unit having the highest priority according to the monitoring priority order included in the parameter . The redundancy system according to claim 2, wherein the control unit stores system switching information related to system switching in the memory unit when it is determined that the system switching is to be performed. The redundancy system of claim 4, wherein the redundant system further comprises: a user device connected to the first system, wherein the control unit receives the system from the user device The system switching information is transmitted to the user device by switching the information transmission request, and the user device displays the system switching information received from the first system on the display unit. A communication unit mounted in a communication unit in a redundant system configured by using a first system and a second system as a standby system of the first system, wherein the communication unit is And communicating with the plurality of slave communication units connected to the first system and the second system, and connecting to the plurality of slave communication units, and having: a memory unit, a memory parameter, and a plurality of the foregoing slaves The survival confirmation data sequentially transmitted by the communication unit, wherein the parameter includes information for specifically specifying a monitoring target unit that is a monitoring target of the communication abnormality among the plurality of the slave communication units; and a control unit, Determining, by the survival confirmation data, whether or not there is a survival unacknowledgment unit that has not confirmed the survival of the plurality of slave communication units for a certain period of time or more, and the existence of the survival unconfirmed unit exists in the determination result Referring to the foregoing parameters, determining whether the survival unconfirmed unit is the aforementioned monitoring target unit At arbitration As a result, the survival unrecognized unit is the monitoring target unit, and it is determined that the system switching from the first system to the second system is performed.