JP5893845B2 - Plant control system and plant control method - Google Patents

Description

  The present invention relates to a plant control system and a plant control method for periodically updating memory areas of a plurality of control devices installed in a plant in synchronization with each other.

  2. Description of the Related Art Conventionally, a plant control system such as an iron and steel plant is configured by a plurality of control devices assigned to each function, and these control devices are connected to each other via a network configured by communication cables and distribution devices.

  The plurality of control devices are respectively connected to devices to be controlled in the plant, and store process control data acquired from these devices.

  Since this process control data is used for monitoring the state of the equipment in the plant in real time, it is necessary to periodically update it to the latest information.

  Therefore, each control device in the plant control system is equipped with a shared memory having a storage area corresponding to all the control devices, and scan transmission is performed in which the control device in the system is periodically cycled to update the shared memory. Thus, information is exchanged between the control devices by a simple process.

JP 2010-124138 A

  However, in the plant control system as described above, the number of communication cables that can be connected to one distribution device is limited, and the number of distribution devices increases and the construction of the network becomes complicated as the scale of the plant increases. .

  For example, as shown in FIG. 5, when a plant control system 100 is constructed by connecting six control devices 110A to 110F using a distribution device to which four communication cables can be connected, two distribution devices (distribution devices) The devices 120A and 120B) need to be connected and used, and if the number of control devices increases to several tens or hundreds, the system configuration becomes more complicated.

  Therefore, system planning, wiring work design and construction become difficult and management becomes complicated, and there is a problem that reliability of the entire system is lowered due to cable disconnection or a failure of a distribution device.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a plant control system and a plant control method capable of easily constructing and managing a system for performing scan transmission.

In order to achieve the above object, a plant control system according to the present invention is a plant control system in which a plurality of control devices are connected. Each control device has a separate storage area corresponding to each of the plurality of control devices. A memory unit, a data acquisition unit that acquires a plurality of types of process control data from a device to be controlled by the own control device at a predetermined time period, and first update cycle information that is preset for each type of the process control data In accordance with the information updated by the own region update control unit and the own region update control unit that updates the information of the region of the own control device of the shared memory unit with the latest process control data acquired by the data acquisition unit. , update processing of the relevant area of the information in the shared memory portion of all other control device, complete with the update cycle represented by the first update period information As, according to the second update period information set in advance, said information updated by the own region update controller acquires from the shared memory unit, the wireless communication to a preset other control device addressed A transfer control unit that performs scan transmission by transferring data in a scan, and scan update control that updates information in the area of the corresponding control device of the shared memory unit with information transferred by scan transmission from any other control device And a section.

Also, the plant control method of the present invention is a control device including a shared memory unit that is each control device of a plant control system to which a plurality of control devices are connected, and has individual storage areas respectively corresponding to the plurality of control devices. According to a data acquisition step in which the apparatus acquires a plurality of types of process control data from a device to be controlled by the self-control apparatus at a predetermined time period, and first update cycle information set in advance for each type of the process control data The self-region update control step for updating the information of the self-control device region of the shared memory unit with the latest process control data acquired in the data acquisition step, and the information updated by the self-region update control step, updating of the corresponding area of the information in the shared memory portion of all other control devices, represented by the first update period information updating As will be completed within the period, in accordance with the second update period information set in advance, the acquired information updated by the own area update control step from the shared memory unit, preset other control device The transfer control step for performing the scan transmission by transferring to the destination by wireless communication and the information transferred by the scan transmission from any other control device to update the information of the corresponding control device area of the shared memory unit And a scan update control step.

  According to the plant control system and the plant control method of the present invention, it is possible to easily construct and manage a system that performs scan transmission.

1 is an overall view showing a configuration of a plant control system according to a first embodiment of the present invention. It is a block diagram which shows the structure of the control apparatus of the plant control system by 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the plant control system by 1st Embodiment of this invention. It is a general view which shows the structure of the plant control system by 2nd Embodiment of this invention. It is a general view which shows the structure of the conventional plant control system.

<< First Embodiment >>
<Configuration of Plan Control System according to First Embodiment>
The configuration of the plant control system according to the first embodiment of the present invention will be described with reference to FIG.

  The plant control system 1 according to the present embodiment is constructed by connecting six control devices 10A to 10F in a state where they can communicate wirelessly. In addition, devices 30A to 30F to be controlled are connected to the control devices 10A to 10F, respectively. Further, to these control devices 10A to 10F, wireless antennas 20A to 20F for avoiding persons and objects that cause communication failures are connected by antenna cables 21A to 21F, respectively.

  Each of the control devices 10A to 10F includes a storage unit 11, a control unit 12, and a wireless communication unit 13, as shown in FIG.

  The storage unit 11 has individual storage areas respectively corresponding to the control devices 10A to 10F, and is shared by all the control devices 10A to 10F by scan transmission that periodically circulates the control devices 10A to 10F and updates information. A shared memory unit 111 that stores information, and a local area update cycle information storage unit 112 and a scan transmission cycle information storage unit 113 that store cycle information for updating information in the shared memory unit 111 are provided.

  The shared memory unit 111 stores an area A for storing process control data acquired by the control apparatus 10A, an area B for storing process control data acquired by the control apparatus 10B, and the process control data acquired by the control apparatus 10C. C area to be stored, D area to store process control data acquired by the control apparatus 10D, E area to store process control data acquired by the control apparatus 10E, and process control data acquired by the control apparatus 10F are stored It has F area.

  The own region update cycle information storage unit 112 stores in advance update cycle information for updating the region of the corresponding shared memory unit 111 with process control data acquired from the device 30 connected to the own control device 10. Yes.

  The scan transmission cycle information storage unit 113 stores in advance update cycle information for transmitting the updated area information of the shared memory unit 111 to another control device 10 to perform scan transmission.

  The control unit 12 includes a data acquisition unit 121, a local area update control unit 122, a transfer control unit 123, and a scan update control unit 124.

  The data acquisition unit 121 acquires control data from the connected devices 30A to 30F at a predetermined time period.

  The own region update control unit 122 uses the latest data acquired by the data acquisition unit 121 according to the update cycle information stored in the own region update cycle information storage unit 112 of the storage unit 11 and information on the shared memory unit 111 of the storage unit 11. Update.

  At this time, the control device 10A updates the information in the A region, the control device 10B updates the information in the B region, the control device 10C updates the information in the C region, and the control device 10D updates the information in the D region. The information is updated, the information in the E area is updated in the control device 10E, and the information in the F area is updated in the control device 10F.

  The transfer control unit 123 acquires the information of the shared memory unit 111 updated by the local area update control unit 122 according to the update cycle information stored in the scan transmission cycle information storage unit 113 of the storage unit 11, and the wireless communication unit 13. Then, scan transmission is performed by transferring to the other control devices via the antenna cables 21A to 21F and the radio antennas 20A to 20F.

  The information of the transfer destination control device is preset in the transfer control unit 123 of each control device in order to perform scan transmission.

  When the scan update control unit 124 acquires information transferred by scan transmission via the wireless antennas 20A to 20F, the antenna cables 21A to 21F, and the wireless communication unit 13 from other control devices, the scan update control unit 124 stores the acquired information. The information in the shared memory unit 111 of the unit 11 is updated.

  The wireless communication unit 13 performs wireless communication with other control devices via the antenna cables 21A to 21F and the antennas 20A to 20F.

  The control unit 12 and the wireless communication unit 13 may be modularized and connected via a data bus.

  In the plant control system 1, since communication between the control devices is performed wirelessly, a cable or a distribution device for connecting the control devices is not required when constructing the system.

<Operation of the plant control system according to the first embodiment>
Next, in the plant control system 1 according to the present embodiment configured using radio as described above, the information in the shared memory unit 111 of the storage unit 11 of the plurality of control devices 10A to 10F is scan transmission using radio. The processing updated by the above will be described with reference to the sequence diagram of FIG.

  In the present embodiment, it is assumed that “10 ms” is stored in advance as update cycle information in the own region update cycle information storage unit 112 of the storage unit 11 of each of the control devices 10A to 10F.

  First, in the control device 10A, the control of the update control unit 122 of the control unit 12 causes the device 30A acquired by the data acquisition unit 121 according to the update cycle information stored in the own region update cycle information storage unit 112 of the storage unit 11. The information in the A area of the shared memory unit 111 of the storage unit 11 is updated with the latest process control data (S1).

  The shared memory updated by the own region update control unit 122 according to the update cycle information stored in the scan transmission cycle information storage unit 113 of the storage unit 11 under the control of the transfer control unit 123 of the control unit 12 of the control device 10A. Information on the area A of the unit 111 is acquired.

  Then, the data is transferred to the control device 10B set in advance as a transfer destination via the wireless communication unit 13, the antenna cable 21A, and the wireless antenna 20A.

  In the control device 10B, the information transferred from the control device 10A is acquired by the update control unit 122 via the wireless antenna 20B, the antenna cable 21B, and the wireless communication unit 13, and the shared memory unit 111 of the storage unit 11 is obtained with this information. The information of the A area is updated.

  Next, when the transfer control unit 123 of the control unit 12 of the control device 10B detects that the information in the A area of the shared memory unit 111 has been updated by the update control unit 122, the A of the shared memory unit 111 after the update is updated. Area information is acquired from the shared memory unit 111.

  Then, the data is transferred to the control device 10C set as a transfer destination in advance via the wireless communication unit 13, the antenna cable 21B, and the wireless antenna 20B.

  Similarly, in the control device 10C, the information in the area A of the shared memory unit 111 is updated with the transferred information, and the updated information is transferred to the control device D. In the control device 10D, the information transferred The information in the A area of the shared memory unit 111 is updated and the updated information is transferred to the control device E. In the control device 10E, the information in the A area of the shared memory unit 111 is updated and updated with the transferred information. The later information is transferred to the control device F, and the information in the A area of the shared memory unit 111 is updated with the transferred information in the control device 10F. In this way, the information in the A area of the shared memory unit 111 is updated in the order of control device 10A → control device 10B → control device 10C → control device 10D → control device 10E → control device 10F (S2).

  By completing the process of step S2 within the update cycle stored in the own region update cycle information storage unit 112, the shared memory units 111 of all the control devices 10A to 10F are synchronized and updated to the same information. Is done. This update process is executed every set period.

  Also in the control devices 10B to 10F, the shared memory unit 111 in the own control device is periodically updated by the same update process, and the information on the corresponding area of the updated shared memory unit 111 is stored in all other control devices. And the information of the shared memory unit 111 in each control device is updated (S3 to S12).

  According to the above embodiment, in the plant control system that sequentially updates the information stored in the plurality of control devices by the scan transmission, the control devices are configured to be connected wirelessly. In addition, it is not necessary to be aware of the number of cables connected to the distribution device, and it can be easily constructed, and the system reliability can be prevented from being lowered due to cable disconnection or a failure of the distribution device.

<< Second Embodiment >>
<Configuration of Plan Control System according to Second Embodiment>
The configuration of the plant control system according to the second embodiment of the present invention will be described with reference to FIG.

  The plant control system 2 according to the present embodiment is similar to the plant control system 1 according to the first embodiment, and includes a control system for the plant X configured by connecting six control devices 10A to 10F wirelessly, and six controls. A system of plant Y configured by wirelessly connecting devices 10G to 10L, a control system of plant Z having one control device 10M, and collecting process control data acquired by the control devices of these control systems The data collection device 50 that performs the process control data collected by the data collection device 50 and the HMI (Human Machine Interface) device 60 that displays the process control data and provides it to a central supervisor are connected by a distribution device 70 via a wired cable. Has been built. In addition, devices 30A to 30M to be controlled are connected to the control devices 10A to 10M, respectively.

  Each of the control devices 10A to 10L has, in the supply memory unit 111 of the storage unit 11, an area A for storing process control data acquired by the control device 10A to an area M for storing process control data acquired by the control device 10M. Other than this, the configuration is the same as that described with reference to FIG. 2 in the first embodiment, and thus detailed description thereof is omitted.

  The control device 10M includes a memory unit 111 that stores, in the storage unit 11, an A region that stores process control data acquired by the control device 10A to an M region that stores process control data acquired by the control device 10M. A wired communication unit that transmits process control data to the data collection device 50 via a communication cable instead of the wireless communication unit 13 is provided, and the data collection device 50 is set as a transfer destination in the transfer control unit 123 of the control unit 12. Since the configuration is the same as that of the control device in FIG. 2, detailed description thereof is omitted.

  A wireless / wired converter 40X is installed in the control system of the plant X, and the wireless / wired converter 40X receives information wirelessly transmitted from 10A to 10F via the wireless antennas 20A to 20F. The data is converted for transmission and transmitted to the data collection device 50 via the cable and distribution device 70.

  Further, a wireless / wired converter 40Y is installed in the control system of the plant Y, and the wireless / wired converter 40Y receives information transmitted wirelessly from 10G to 10L via the wireless antennas 20G to 20L. The data is converted to wired transmission and transmitted to the data collection device 50 via the cable and distribution device 70.

<Operation of the plant control system according to the second embodiment>
In the plant control system 2 according to the present embodiment configured by wireless and wired as described above, the same control unit 10A to F in the plant X is synchronized by the scan transmission described in the first embodiment. The information is updated and the update process is executed every set period.

  At this time, information wirelessly transmitted from any of the control devices 10A to 10F via the wireless antenna 20 is received by the wireless / wired converter 40X, and the wireless / wired converter 40Y is transmitted via the distribution device 70 by a wired cable. And is received from the radio antenna 20 by any of the control devices 10G to 10L by radio. Then, in the control devices 10G to 10L in the plant Y, update processing is executed in synchronization with the scan transmission described in the first embodiment.

  Information transmitted wirelessly from any of the control devices 10G to 10L via the wireless antenna 20 is received by the wireless / wired converter 40Y and received by the control device 10M via the distribution device 70 by a wired cable. .

  The information updated periodically in synchronization is acquired and stored by the data collection device 50.

  In the HMI device 60, the information accumulated in the data collection device 50 by the operation of the monitor is displayed and provided to the monitor.

  Also in the control devices 10B to 10M, the shared memory unit 111 in the own control device is periodically updated by the same update process, and the updated information in the shared memory unit 111 is scanned and transmitted to all other control devices. Then, the information in the shared memory unit 111 in each control device is updated.

  According to the second embodiment described above, a control device is connected wirelessly in an area where wireless communication can be performed in the monitored plant, and is necessary in an area where there is an object that interferes with wireless communication such as a wall between the control devices. Accordingly, by using communication cables and distribution devices, it is possible to construct a wide-area plant control system with a simple configuration in which the number of communication cables and distribution devices is reduced as compared with the conventional case.

<< Third Embodiment >>
<Configuration of Plant Control System According to Third Embodiment>
Since the plant control system according to the present embodiment has the same configuration as that of the plant control system 1 according to the first embodiment or the plant control system 2 according to the second embodiment, detailed description thereof is omitted.

  In the present embodiment, the data acquisition unit 121 of the control unit 12 of the control apparatus 10 acquires process control data from a plurality of devices 30, and the own region update cycle information storage unit 112 of the storage unit 11 stores the type of process control data, etc. Are stored in advance.

<Operation of Plant Control System According to Third Embodiment>
In the plant control system according to the present embodiment, the own region update cycle information storage unit 112 stores “1 ms” in the high speed mode, “10 ms” in the medium speed mode, and “100 ms in the low speed mode depending on the type of process control data as the update cycle information. ”Are preset and stored.

  Then, the corresponding information in the shared memory unit 111 is updated at the mode update period set for each type of process control data, whereby the shared memory unit 111 of another control device is sequentially updated by scan transmission.

  According to the present embodiment described above, scan transmission can be performed in correspondence with a plurality of modes having different update cycles.

DESCRIPTION OF SYMBOLS 1, 2 ... Plant control system 10A-10M ... Control apparatus 11 ... Memory | storage part 12 ... Control part 13 ... Wireless communication part 20A-20L ... Radio antenna 21A-21L ... Cable for antennas 30A-30M ... Equipment 40X, 40Y ... Wireless / Wired converter 50 ... Data collection device 60 ... HMI device 70 ... Distribution device 111 ... Shared memory unit 112 ... Own region update cycle information storage unit 113 ... Scan transmission cycle information storage unit 121 ... Data acquisition unit 122 ... Own region update control unit 123: Transfer control unit 124 ... Scan update control unit

Claims (3)

In a plant control system in which multiple control devices are connected,
Each of the control devices
A shared memory unit having individual storage areas respectively corresponding to the plurality of control devices;
A data acquisition unit that acquires a plurality of types of process control data at a predetermined time period from a device to be controlled by the own control device;
In accordance with first update cycle information preset for each type of the process control data, the self-control device area information of the shared memory unit is updated with the latest process control data acquired by the data acquisition unit. An area update control unit;
The update process of the information in the corresponding area of the shared memory unit of all other control devices by the information updated by the own area update control unit is completed within the update cycle indicated by the first update cycle information. As described above, in accordance with the preset second update cycle information, the information updated by the own region update control unit is acquired from the shared memory unit and wirelessly communicated to another preset control device. A transfer control unit that performs scan transmission by transferring, and
A scan update control unit that updates information of a region of the corresponding control device of the shared memory unit with information transferred by scan transmission from any other control device;
A plant control system comprising: Connected to other plant control systems by wire,
2. The plant control system according to claim 1, wherein the transfer control unit transmits information transferred by scan transmission to the other control device set in advance to the other plant control system in a wired manner. . Each control device of a plant control system to which a plurality of control devices are connected, and a control device including a shared memory unit having individual storage areas respectively corresponding to the plurality of control devices,
A data acquisition step of acquiring a plurality of types of process control data at a predetermined time period from a device to be controlled by the own control device;
In accordance with the first update cycle information preset for each type of the process control data, the information on the area of the own control device of the shared memory unit is updated with the latest process control data acquired in the data acquisition step. An area update control step;
The update process of the information in the corresponding area of the shared memory unit of all other control devices by the information updated in the own area update control step is completed within the update cycle indicated by the first update cycle information. As described above, according to the preset second update cycle information, the information updated by the own region update control step is acquired from the shared memory unit and wirelessly communicated to another preset control device. A transfer control step for performing scan transmission by transferring, and
A scan update control step of updating the information of the area of the corresponding control device of the shared memory unit with information transferred by scan transmission from any other control device;
A plant control method characterized by comprising:

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