JP2007272285A - Multiplexing control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction in processing speed in each controller at the time of equalization in each device of data input to a multiplexing control device for performing processing while multiplexing controllers. <P>SOLUTION: In the duplex control device 1, either one of controllers 10 and 20 connected to a data bus 40 notifies start information of data input to the other controller prior to data input from an input device 30, and the other controller synchronously receives data, when the one controller receives the data from the input device 30 through the data bus 40 the other controller, according to the notification. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a multiplexing control apparatus that performs control by duplication or multiplexing.

  In a control device for controlling an industrial plant, etc., in order to perform processing constantly with high reliability, two or more control devices are provided, and each control device performs the same processing. Some control processes are made redundant. For example, Patent Document 1 discloses a technique related to a duplex computer that performs the same control operation in synchronization with each other.

  The control device that performs processing by duplicating or multiplexing the measured values or operation consoles measured in the plant in order to continue the processing of the plant without stopping even if any of the control devices malfunctions. The input data such as the operation instruction from is made equal in each control device, and the same processing is performed in each control device.

  FIG. 2 illustrates a configuration of a conventional duplexing control apparatus 100 that performs duplexing and processing with the control apparatus. As shown in FIG. 2, the duplex control device 100 is connected to the input device 130 via the data bus 140, and the control devices 110 and 120 can communicate with the input device 130.

  The control device 110 includes a main processor 111, a main memory 112, a shared memory 113, an IO processor 114, an input / output communication IF unit 115, a duplex IF unit 116, and an arbitration circuit 117. The main processor 111 develops data, processing programs, and the like in the main memory 112 and instructs operation processing of the duplex control apparatus 100. The IO processor 114 receives data from the input device 130 via the input / output communication IF unit 115 and stores it on the shared memory 113. The shared memory 113 can transmit and receive data from the IO processor 114 and the main processor 111. The duplex IF unit 116 performs data transfer for holding the same data (equalization) with the control device 120 that performs the control of the duplex control device 100 in a duplex manner. The arbitration circuit 117 performs arbitration between access to the main memory 112 by data transfer of the duplex IF unit 116 and access to the main memory 112 by the main processor 111.

  The control device 120 includes a main processor 121, a main memory 122, a shared memory 123, an IO processor 124, an input / output communication IF unit 125, a duplex IF unit 126, and an arbitration circuit 127 that are equivalent to the control device 110 described above. The input device 130 is an operation console or a detector such as a plant controlled by the duplex control device 100, and inputs various data related to control.

  In the duplex control device 100, data input from the input device 130 is read by the IO processor 114 and stored in the shared memory 113 of the control device 110. The data stored in the shared memory 113 is read from the main processor 111 to the main memory 112, and the data stored in the main memory 112 and the data stored in the main memory 122 are connected via the duplex IF units 116 and 126. Are equalized. Although not specifically described, a configuration in which input data is stored in the shared memory 123 of the control device 120 and equalized may be employed.

  In the data equalization via the duplex IF units 116 and 126, the main processor 111 outputs an equalization request to the main processor 121 via the duplex IF units 116 and 126, and in response to the equalization request. The main processor 121 reads out the data stored in the main memory 112 via the duplex IF units 116 and 126 and stores it in the main memory 122. When the main processor 121 reads data from the main memory 112, the arbitration circuit 117 performs arbitration between the main processor 111 and the access to the main memory 112.

As described above, in the duplex control device 100, data input from the input device 130 is equalized between the main memory 112 of the control device 110 and the main memory 122 of the control device 120. For this reason, the duplexing control device 100 is configured to obtain the same calculation result even when duplexing by performing the same processing in the main processors 111 and 121.
Japanese Unexamined Patent Publication No. 6-242979

  However, in the above-described prior art, when the input data is equalized, the access of the main processor that performs arithmetic processing and the access related to duplication are performed while arbitrating, so the access of the main processor is awaited. In some cases, the processing speed may be reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to equalize data input to a multiplexing control device that performs processing by multiplexing control devices in each control device. This is to prevent a decrease in processing speed in the control device.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a multiplexing control device that is connected to a data bus and multiplexes and processes by a plurality of control devices based on data input from an external device. Before any data input from the external device, the control device notifies the other control device of start information of data input from the external device, and the other control device When the control device receives data from the external device via the data bus, the data is received synchronously according to the data input start information from the external device notified from any of the control devices. It is characterized by doing.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control device is an input for notifying the IO processor that controls data input from the external device of the start of input of data to be multiplexed. Prior to data input from the external device, any one of the control devices turns on an input equalization flag of the control device and an input equalization flag of the other control device. It is characterized by.

  According to the first aspect of the present invention, the data input to the multiplexing control device that multiplexes the control devices and performs processing can be received synchronously by each control device, and once at any of the control devices. Since the process of transmitting the received data to another control device can be omitted, it is possible to prevent a decrease in processing speed in the control device.

  According to a second aspect of the present invention, the control device has an input equalization flag that notifies the IO processor that controls data input from the external device that data input is started, and any of the control devices Prior to the data input from the external device, the input equalization flag of the control device and the input equalization flag of the other control device can be turned on. The data input can be performed in parallel, and the data input in one of the control devices does not hinder the processing in the other control device, and the reduction in the processing speed can be prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1, but the present invention is not limited to the following embodiment. The embodiments of the present invention show the most preferable modes of the invention, and the uses and terms of the invention are not limited thereto.

  FIG. 1 is a block diagram schematically showing a functional configuration of a duplexing control apparatus 1 according to the present invention that performs duplexing with the control apparatus 10 and the control apparatus 20. As shown in FIG. 1, the duplex control device 1 is connected to the input device 30 via a data bus 40, and the control device 10 and the control device 20 can communicate with the input device 30.

  The control device 10 includes a main processor 11, a main memory 12, a shared memory 13, an IO processor 14, an input / output communication IF unit 15, a duplex IF unit 16, an arbitration circuit 17, and an input equalization flag 18. The input equalization flag 18 is a flag that is turned on / off based on an instruction from another control unit input via the duplex IF unit 16 or an instruction from the main processor 11, and the data bus 40 in the IO processor 14. Is instructed to start data input from the input device 30.

  The control device 20 includes a main processor 21, a main memory 22, a shared memory 23, an IO processor 24, an input / output communication IF unit 25, a duplex IF unit 26, an arbitration circuit 27, and an input equalization flag equivalent to the control device 10 described above. 28. The input device 30 is an operation console or a detector of a plant or the like that is controlled by the duplex control device 1 and is a device that inputs various data related to control.

  Here, the operation of equalizing the data input from the input device 30 in response to the data input start instruction of the main processor 11 between the control device 10 and the control device 20 in the duplex control device 1 will be described in detail. . In the following description, the main processor 11 outputs a data input start instruction. However, it goes without saying that the main processor 21 may output a data input start instruction.

  Prior to data input from the input device 30, the main processor 11 sets the input equalization flag 28 to ON via the duplex IF units 16 and 26, and inputs the input device 30 via the data bus 40 to the IO processor 14. The input / output communication IF unit 15 is instructed to receive data from In response to an instruction from the main processor 11, the IO processor 14 instructs the data output from the input device 30 to the data bus 40 and starts receiving data from the input device 30 by the input / output communication IF unit 15, The received data is stored in the shared memory 13.

  On the other hand, the IO processor 24 in the control device 20 starts data reception in the input / output communication IF unit 25 in response to the input equalization flag 28 being turned on, and the data bus from the input device 30 is instructed by the IO processor 14 described above. The received data is received in synchronization with the data reception performed at the input / output communication IF unit 15 and the received data is stored in the shared memory 23.

  As described above, the duplexing control device 1 includes the control device 10 and the control device 20 connected to the data bus 40, and one of the control devices inputs the data to another control device prior to the data input from the input device 30. The other control device is configured such that when one of the control devices receives data from the input device 30 via the data bus 40, the other control device receives it synchronously in response to the notification.

  For this reason, the duplexing control device 1 performs a process of transmitting data received by one of the control devices to another control device when equalizing the data input to the multiplexing control device by each control device. Since it can be omitted, it is possible to prevent a decrease in processing speed in the control device.

[Modification]
Here, it is a modification of the above-described equalization operation in the duplexing control device 1, and the duplexing IF unit 16 monitors the setting status of the input equalization flag 18, and the setting status is monitored via the duplexing IF unit 26. The case of reflecting in the setting of the input equalization flag 28 will be described. Needless to say, the duplex IF unit 26 may monitor the setting status of the input equalization flag 28 and reflect the setting status in the setting of the input equalization flag 18 via the duplex IF unit 16.

  The main processor 11 sets the input equalization flag 18 to ON as a data input instruction to be multiplexed from the input device 30. In response to the ON setting of the input equalization flag 18, the duplex IF unit 16 turns on the setting of the input equalization flag 28 via the duplex IF unit 26.

  The IO processor 14 of the control device 10 causes the input / output communication IF unit 15 to receive data from the input device 30 via the data bus 40 in accordance with the ON setting of the input equalization flag 18 and receives the data. Data is stored in the shared memory 13.

  On the other hand, the IO processor 24 of the control device 20 causes the input / output communication IF unit 25 to receive data from the input device 30 via the data bus 40 in response to the input equalization flag 28 being turned on. Data is stored in the shared memory 23.

  As described above, the duplexing control device 1 is connected to the data bus 40, and the control device 10 having the input equalization flag that notifies the IO processor that controls the data input from the input device 30 of the start of data input, the control In the device 20, one of the control devices is configured to turn on the input equalization flags of the control device and other control devices prior to data input from the input device 30.

  For this reason, the duplexing control device 1 can perform data input from an external device necessary for multiplexing processing in each control device in parallel, and other data inputs related to multiplexing in the control device 10 and the control device 20 can be used. Therefore, it is possible to prevent a decrease in processing speed without hindering the processing in the control device.

  Note that the description in the present embodiment shows an example of the present invention, and the present invention is not limited to this. The configuration and operation of the duplex control device 1 in the present embodiment can be appropriately changed without departing from the spirit of the present invention.

  For example, in the duplex control device 1 in the present embodiment, the configuration in which the control devices 10 and 20 connected to the data bus 40 perform duplex processing is illustrated, but a plurality of control devices are further connected to the data bus 40. When any of the control devices inputs data from the input device 30, the input equalization flag of another control device may be turned on.

It is a block diagram which shows typically the functional structure of the duplication control apparatus 1 which is this invention which duplicates and processes with the control apparatus 10 and the control apparatus 20. FIG. It is a block diagram which illustrates the structure of the conventional duplication control apparatus 100 which duplicates and processes by a control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Duplex control apparatus 10, 20 Control apparatus 11, 21 Main processor 12, 22 Main memory 13, 23 Shared memory 14, 24 IO processor 15, 25 Input / output communication IF section 16, 26 Duplex IF section 17, 27 Arbitration circuit 18, 28 Input equalization flag 30 Input device 40 Data bus

Claims (2)

In a multiplexing control device that is connected to a data bus and performs processing by multiplexing with a plurality of control devices based on data input from an external device,
Prior to data input from the external device, any one of the control devices notifies start information of data input from the external device to the other control device,
The other control device, when any one of the control devices receives data from the external device via the data bus, starts data input from the external device notified from any of the control devices In response, the multiplexing control apparatus receives the data synchronously. The control device has an input equalization flag for notifying the start of data input to an IO processor that controls data input from the external device,
Any one of the control devices turns on an input equalization flag of the control device and an input equalization flag of the other control device prior to data input from the external device. The multiplexing control apparatus according to claim 1.

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