JP2020173505A - Monitoring control system and data transmission device for water treatment facilities - Google Patents

Abstract

To provide a monitoring control system and a data transmission device capable of easily monitoring and controlling a plurality of water treatment facilities.SOLUTION: A monitoring control system includes a plurality of host controllers 5 for sequentially controlling devices, and a plurality of data transmission devices 4 that are associated with one or more of the host controllers 5, connected communicably to the associated controllers, and able to communicate with each other. The data transmitting device 4 includes an inter-station shared memory 42 that stores the data of the associated host controller 5 and shares it between the data transmission devices 4, and an inter-station transmission/reception unit 41 that transmits, among the data stored in the inter-station shared memory 42, only the data required by the associated host controller 5 to the associated host controller 5.SELECTED DRAWING: Figure 2

Description

An embodiment of the present invention relates to a monitoring control system and a data transmission device of a water treatment facility.

Conventionally, a monitoring and control system that monitors and controls a water treatment facility for water supply or sewerage has constructed a hierarchical command processing system with a monitoring and control server as the uppermost layer between each device such as a pump and a valve. In addition to the monitoring and control server, it is equipped with a plurality of upper controllers and a plurality of lower controllers. The lower controller located away from the upper controller is connected to the upper controller by a telemeter line. The telemeter line uses a general telephone line and has a longer transmission distance than a LAN.

The monitoring and control server sends a request according to the operation plan of the water treatment facility to the host controller. The host controller is a programmable logic controller that advances the sequence of fulfilling requests and sends execution commands to the host controller. The lower controller includes a drive circuit that generates a current or voltage signal by an analog or pulse wave that drives the device, and a microcomputer, interprets an execution command, and actually drives the device.

The host controller has a mechanism for exchanging data between the host controllers and sharing the data possessed by each host controller. For example, the upper controller has a shared memory for storing the data of the own node and the other node, and when the patrol token is acquired, the data of the own node is used for the own node among the shared memories of the other higher controllers. It is written in the area declared in. When 20 higher-level controllers are provided in the monitoring control system, data for 20 units is written to the shared memory.

2014-22978

In recent years, monitoring and control systems have been oriented toward centralized systems for the purpose of labor saving. That is, it is required that one monitoring and control system monitors and controls a plurality of water treatment facilities. The increase in the number of water treatment facilities under the jurisdiction leads to an increase in the number of host controllers in the monitoring and control system.

The host controller has a limit on the number of connections that can share data due to hardware problems such as the capacity of shared memory. If an attempt is made to increase the number of water treatment facilities to be monitored, the number of host controllers provided in the monitoring and control system may exceed the limit. Therefore, it was not possible to construct a monitoring and control system of a desired scale, and satisfactory labor saving could not be achieved.

An embodiment of the present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is a monitoring control system and data capable of easily monitoring and controlling a plurality of water treatment facilities. The purpose is to provide a transmission device.

The monitoring and control system of the water treatment facility according to the embodiment of the present invention is a monitoring and control system that controls the devices in the water treatment facility, and corresponds to a plurality of controllers for sequence control of the devices and one or a plurality of the controllers. It is provided with a plurality of data transmission devices that are attached, communicably connected to a corresponding controller, and can communicate with each other, and the data transmission device stores data of the corresponding controller. , A shared memory shared between the data transmission devices, and a transmission / reception unit that transmits only the data stored in the shared memory that is required by the corresponding controller to the corresponding controller. Have.

Further, the data transmission device according to the embodiment of the present invention is provided in a plurality of monitoring control systems in which a device in a water treatment facility is controlled by a plurality of controllers, and is associated with one or a plurality of the controllers and has a corresponding relationship. A shared memory that is communicably connected to the controller and can communicate with each other, stores data of the corresponding controllers, and is shared between the data transmission devices, and data stored in the shared memory. Among them, a transmission / reception unit for transmitting only data required by the corresponding controller to the corresponding controller is provided.

It is a block diagram which shows the structure of the monitoring control system of embodiment. It is a block diagram which shows the structure of the data transmission apparatus of embodiment. It is a schematic diagram which shows cyclic transmission between data transmission devices. It is a block diagram which shows the application example of the monitoring control system of embodiment.

The monitoring and control system of the water treatment facility of the embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a monitoring control system. The monitoring and control system 1 monitors the state of the water treatment facility of the water supply or the sewer, and controls each device 100 in the water treatment facility according to the operation plan. The state of the water treatment facility includes, for example, the operation, stoppage, abnormality, water level, etc. of the device 100. The device 100 includes, for example, a pump and a valve.

The monitoring control system 1 includes a monitoring control server 2 and an operation terminal 3. The monitoring and control server 2 and the operation terminal 3 are each a computer, and are provided with a communication interface so that they can communicate with each other. The operation terminal 3 further includes a display device such as a liquid crystal display or an organic EL display, and a man-machine input device such as a keyboard, a mouse, or a touch panel. The monitoring and control server 2 collects the state of the water treatment facility and transmits it to the operation terminal 3, and the operation terminal 3 displays the state of the water treatment facility collected by the monitoring and control server 2. Further, the monitoring control server 2 creates an operation plan of the water treatment facility according to the operation of the operator using the operation terminal 3.

In order to execute the operation plan, the monitoring and control system 1 constructs a hierarchical instruction processing system up to the device 100 with the monitoring and control server 2 as the uppermost layer. Such a monitoring and control system 1 includes a plurality of upper controllers 5 and a plurality of lower controllers 6 in addition to the monitoring and control server 2. The host controller 5 is a programmable logic controller. The lower controller 6 includes a drive circuit and a microcomputer that generate a current or voltage signal by an analog or pulse wave that drives the device 100.

The monitoring and control server 2 transmits an operation request having a high degree of abstraction and requiring interpretation to the host controller 5 according to the operation plan of the water treatment facility. The operation request also includes a stop instruction. The upper controller 5 interprets the operation request, advances the sequence for fulfilling the operation request, and transmits the execution command to the lower controller 6. The lower controller 6 is connected to the device 100, interprets an execution command, outputs a current or voltage signal by an analog or pulse wave that actually drives the device 100 to the device 100, and drives the device 100.

The upper controller 5 may use the data possessed by the other upper controller 5 for processing the operation request. Therefore, the monitoring control system 1 further includes a plurality of data transmission devices 4. The data transmission device 4 is associated with the host controller 5 on a one-to-one basis and is connected to the host controller 5 in a corresponding relationship. Further, the plurality of data transmission devices 4 are connected to a common network 7 so that they can communicate with each other. This data transmission device 4 is an industrial PC, and while acquiring the data of the corresponding upper controller 5, the cyclic transmission between the upper controllers 5 is performed by the data transmission device 4 on behalf of the other upper controllers. The data held by the controller 5 is shared, and the data required by the corresponding upper controller 5 is distributed to the upper controller 5.

FIG. 2 is a block diagram showing a configuration related to cyclic transmission of the data transmission device 4 and the host controller 5. As shown in FIG. 2, the data transmission device 4 includes an inter-station transmission / reception unit 41, an inter-station shared memory 42, an in-station transmission / reception unit 43, an in-station shared memory 44, and a list storage unit 45. Further, the host controller 5 includes an in-station transmission / reception unit 51, an in-station shared memory 52, a request processing unit 53, and a list storage unit 54.

The inter-station transmission / reception unit 41 and the inter-station shared memory 42 create a virtual memory in which each data transmission device 4 stores the same contents by cyclic transmission. FIG. 3 is a schematic diagram showing cyclic transmission between the data transmission devices 4. As shown in FIG. 3, the station-to-station shared memory 42 is provided in each data transmission device 4, and the same logical address is assigned to all the data transmission devices 4. The inter-station transmission / reception unit 41 declares the area 42a of the own node so that the logical addresses do not overlap, and the area 42a of the own node and the area 42b of the other data transmission device 4 are secured in the inter-station shared memory 42. ing.

Then, the inter-station transmission / reception unit 41 sequentially acquires the patrolling tokens, becomes a talker, and transmits the data written in the area 42a of the own node to another data transmission device 4 by broadcasting. The inter-station transmission / reception unit 41 of the other data transmission device 4 which is a listener stores the data received from the talker in the area 42b secured by the talker.

Further, as shown in FIG. 3, the in-station transmission / reception unit 43 and the in-station shared memory 44 of the data transmission device 4 and the in-station transmission / reception unit 51 and the in-station shared memory 52 of the upper controller 5 are in a corresponding relationship with the data transmission device 4 and the upper controller. 5 creates a virtual memory that stores the same contents. The same logical address is assigned to the in-station shared memory 44 and the in-station shared memory 52 by the data transmission device 4 and the host controller 5, which are in a corresponding relationship. Further, the station transmission / reception unit 43 declares the area 44a of the own node so that the logical addresses do not overlap, and the station transmission / reception unit 51 declares the area 52a of the own node so that the logical addresses do not overlap, and the station shared memory 44. The area 44a of the data transmission device 4 and the area 52a of the host controller 5 are secured in the shared memory 52 in the station and in the station.

Then, the in-station transmission / reception unit 51 of the host controller 5 transmits the data written in the area 52a of the own node to the data transmission device 4 having a corresponding relationship. The in-station transmission / reception unit 43 of the data transmission device 4 having a corresponding relationship writes the data received from the upper controller 5 to the area 52a secured by the upper controller 5. Further, the in-station transmission / reception unit 43 of the data transmission device 4 transmits the data written in the area 44a of the own node to the data transmission device 4 having a corresponding relationship. The in-station transmission / reception unit 51 of the higher-level controller 5, which has a corresponding relationship, stores the data received from the data transmission device 4 in the area 44a secured by the data transmission device 4.

Here, as shown in FIG. 3, the request processing unit 53 of the host controller 5 interprets the operation request and advances the sequence. As a result of processing the operation request and advancing the sequence, the request processing unit 53 writes the data generated by itself to the area 52a of the own node of the station shared memory 52. Further, the area 52a in the station shared memory 44 secured by the host controller 5 and the area 42a in the station shared memory 42 secured by the data transmission device 4 are the same area. In other words, the inter-station transmission / reception unit 41 that performs cyclic transmission between the data transmission devices 4 sets the area 52a in which the corresponding upper controller 5 is secured as the own node with the data transmission device 4 of the own node. Declare as area 42a.

Further, as shown in FIG. 3, the request processing unit 53 refers to the data generated by the other upper controller 5 in order to process the operation request. The area 44a in the inter-station shared memory 42 in which the data referred to by the corresponding upper controller 5 is written is the same as the area 44a in the in-station shared memory 44 secured as its own node by the data transmission device 4. In other words, the intra-station transmission / reception unit 43 declares the area 44a in which the data referred to by the corresponding upper controller 5 is written as the area 44a of its own node with the upper controller 5.

As shown in FIG. 3, when declaring the area 44a of the own node, the intra-station transmission / reception unit 43 refers to the list 45a stored in the list storage unit 45. The list 45a specifies an area 44a in the in-station shared memory 44 in which necessary data is written by the corresponding upper controller 5. The in-station transmission / reception unit 43 secures the area 44a specified by the list 45a as the area 44a of its own node with respect to the host controller 5. The list 45a is stored in the list storage unit 54 of the host controller 5, is transmitted from the host controller 5 to the data transmission device 4, and is stored in the list storage section 45.

For example, the data D1 possessed by the first higher-level controller 5 is stored in the area 52a declared by the first higher-level controller 5 as that of the own node in relation to the first data transmission device 4. This data D1 is written in the area 52a of the in-station shared memory 44 in the first data transmission device 4 by communication between the first data transmission device 4 and the first higher-level controller 5. From the standpoint of the inter-station shared memory 42, the area 52a of the first data transmission device 4 is also the area 42a of the own node declared by the first data transmission device 4 between the data transmission devices 4. Therefore, the first data transmission device 4 distributes the data possessed by the first higher-level controller 5 to the other data transmission devices 4.

Next, the data D2 and D3 possessed by the other upper controller 5 are moved to the area 42b declared by the other node in the inter-station shared memory 42 of the first upper controller 5 by cyclic transmission between the data transmission devices 4. It has been written. Of all the areas 42b, the area 42b in which the data D2 and D3 are written is the own node declared by the first data transmission device 4 with the first higher controller 5 from the standpoint of the shared memory 44 in the station. It is also an area 44a. Therefore, the first data transmission device 4 distributes only the data D2 and D3 to the first upper controller 5 among the data written in the entire area 42b declared by the other data transmission device 4.

The data D4 and D5 of the other upper controller 5 written in the area 42b where the first data transmission device 4 is not declared as its own node with the first upper controller 5 are the first. It is unnecessary for the upper controller 5 of the above and is not passed to the first upper controller 5.

In this way, the data transmission device 4 acquires the data of the corresponding upper controller 5 and shares it among the data transmission devices 4. In other words, each upper controller 5 of the monitoring and control system 1 entrusts the data transmission device 4 to share the data of all the upper controllers 5, and does not share the data between the upper controllers 5. Moreover, the data transmission device 4 passes only the data required by the corresponding upper controller 5 among the data shared between the data transmission devices 4 to the higher controller 5.

Therefore, the in-station shared memory 52 of the upper controller 5 does not become saturated even if the scale of the monitoring control system 1 is expanded and the number of the upper controllers 5 is increased. Therefore, it is possible to expand the scale of the monitoring and control system 1 to construct a centralized system, and it is possible to achieve labor saving. FIG. 4 is a configuration diagram showing an application example of such a monitoring control system 1.

The monitoring and control system 1 shown in FIG. 4 is a centralized system, and is not limited to one facility, and management and control through WAN 72 not only for one facility but also for a plurality of facilities including a water treatment facility away from the facility where the monitoring and control system 1 is installed. To execute. Although the number of upper controllers 5 increases due to management and control of a plurality of facilities, since the upper controller 5 does not directly share information and the data transmission device 4 acts on its behalf, regardless of the hardware limitation of the upper controller 5. Information is shared.

The data transmission device 4 is installed in the same facility as the host controller 5 which has a corresponding relationship. That is, the common network 7 to which the plurality of data transmission devices 4 are connected is constructed by LAN 71 and WAN 72. The LAN 71 is laid in the place where the monitoring control server 2 is installed, is also laid in another water treatment facility without the monitoring control server 2, and is also installed in the LAN 71 in another water treatment facility without the monitoring control server 2. The data transmission device 4 is connected. The LAN 71 is duplicated so as to have redundancy, and a gateway device 73 is installed between the LAN 71 and the WAN 72.

Next, regarding the connection between the upper controller 5 and the lower controller 6, conventionally, a telemeter line, which is a connection method using a general telephone line, may be used. The reason is as follows. That is, when the number of upper controllers 5 is limited, it is necessary to connect as many lower controllers 6 as possible to one upper controller 5. Then, all the lower controllers 6 connected to one upper controller 5 may not be crowded around the upper controller 5. In this case, the LAN connection cannot be used between the lower controller 6 and the upper controller 5 at a remote location due to the limitation of the transmission distance, and a telemeter line is used. Since the telemeter line requires a charge to the line operator and the transmission speed is lower than that of LAN8, it is necessary to allow a delay in the response of data transmission / reception as an operational risk.

On the other hand, in this monitoring control system 1, there is no limit on the number of upper controllers 5. Therefore, the upper controller 5 dedicated to the lower controller 6 can be separately arranged in the lower controller 6 installed at a place away from the other lower controller 6. In other words, the lower controller 6 and the upper controller 5 can be placed in a positional relationship that allows LAN connection. Therefore, in this monitoring control system 1, the upper controller 5 and the lower controller 6 are connected by LAN 8 regardless of the telemeter line.

In this way, the monitoring control system 1 is associated with a plurality of higher-level controllers 5 that sequence-control the device 100 and one or more of the higher-level controllers 5, and is communicably connected to the corresponding controllers. A plurality of data transmission devices 4 capable of communicating with each other are provided. The data transmission device 4 stores the data of the higher-level controller 5 having a correspondence relationship, and has a correspondence relationship between the inter-station shared memory 42 shared between the data transmission devices 4 and the data stored in the inter-station shared memory 42. The upper controller 5 in the above has an inter-station transmission / reception unit 41 that transmits only necessary data to the corresponding upper controller 5.

As a result, even if the number of upper controllers 5 increases, the data of each upper controller 5 can be shared, so that the scale of the monitoring control system 1 can be expanded and a centralized system can be constructed. It becomes possible and labor saving can be achieved. That is, it is possible to control the devices 100 of a plurality of remote water treatment facilities remote from the monitoring control system 1.

In addition, a lower controller 6 that actually operates the device 100 by receiving an execution command from the upper controller 5 is provided, and the upper controller 5 and the lower controller 6 are connected by LAN8. This is because the number of the upper controller 5 can be easily increased. As a result, the upper controller 5 and the lower controller 6 can be connected by the LAN 8, the line operator is not charged, and the delay is delayed. Since there are few, high-speed processing by the monitoring and control system 1 becomes possible.

Further, the host controller 5 includes a list storage unit 54 that stores a list 45a that identifies necessary data, and the data transmission device 4 includes a list storage unit 45 that acquires and stores the list 45a, and the station transmission / reception unit 43. Is to transmit necessary data to the corresponding upper controller 5 based on the list 45a. As a result, even if the data required on the host controller 5 side is changed, the data transmission device 4 can immediately respond to the change, and the system can be given flexibility.

(Other embodiments)
Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention as well as the invention described in the claims and the equivalent scope thereof.

For example, although the example in which the data transmission device 4 is associated with the host controller 5 on a one-to-one basis has been described, it may be associated with the host controller 5 on a one-to-one basis. The area 42a of the own node in the data transmission device 4 is divided so that the area 52a of the own node of the plurality of higher-level controllers 5 is allocated. Further, the list 45a is received from the plurality of host controllers 5, and all the lists 45a specified in each list 45a are set as the area 44a of the own node. Then, the data transmission / reception of the data transmission device 4 and each upper controller 5 is a message transmission in which the transmission destination is specified.

Further, the upper controller 5 and the lower controller 6 may be associated with each other on a one-to-one basis or on a one-to-one basis.

1 Monitoring control system 2 Monitoring control server 3 Operation terminal 4 Data transmission device 41 Inter-station shared memory 42a Area 42b Area 43 In-station shared memory 44 in-station shared memory 44a Area 45 List storage 45a List 5 Upper controller 51 In-station Transmission / reception unit 52 Internal shared memory 52a Area 53 Request processing unit 54 List storage unit 6 Lower controller 7 Network 71 LAN
72 WAN
73 Gateway device 8 LAN
100 devices

Claims (6)

A monitoring and control system that controls devices in a water treatment facility.
Multiple controllers for sequence control of devices and
A plurality of data transmission devices that are associated with one or more of the controllers, are communicably connected to the corresponding controllers, and can communicate with each other.
With
The data transmission device is
A shared memory that stores the data of the controllers in the corresponding relationship and shares it between the data transmission devices,
Of the data stored in the shared memory, the transmission / reception unit that transmits only the data required by the corresponding controller to the corresponding controller, and the transmission / reception unit.
Monitoring and control system with. Control devices located in multiple water treatment facilities,
The monitoring and control system according to claim 1. The data transmission device is
Distributed in multiple water treatment facilities
Corresponding to some or all of the controllers installed in the same water treatment facility,
The monitoring control system according to claim 2. It is equipped with a lower controller that actually operates the device in response to a command from the controller.
The controller and the lower controller are connected by a LAN.
The monitoring and control system according to claim 3. The controller includes a storage unit that stores a list that identifies the required data.
The data transmission device includes a storage unit that acquires and stores the list.
The transmission / reception unit transmits the necessary data to the corresponding controller based on the list.
The monitoring control system according to any one of claims 1 to 4. Multiple monitoring and control systems that control devices in water treatment facilities with multiple controllers
It is associated with one or more of the controllers, is communicably connected to a corresponding controller, and is communicable with each other.
A shared memory that stores the data of the controllers in the corresponding relationship and shares it between the data transmission devices,
Of the data stored in the shared memory, the transmission / reception unit that transmits only the data required by the corresponding controller to the corresponding controller, and the transmission / reception unit.
A data transmission device comprising.

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