JP2001242932A - Plant supervisory control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant supervisory control system wherein it makes it possible to display a trend graph which is nearly real data and to collect extremely precise trend data. SOLUTION: On transmitting process data to the device for supervisory control 1 from a controller 6, periodical data sampled with the controller 6 and the periodical data transmitted to the device for supervisory control 1 are set at a setting part for request trend information, the data are collected at a collecting and controlling part 7 depending on this and the data are transmitted to the supervisory control 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant monitoring and control system for monitoring and controlling a process of a plant, and more particularly to collecting trend data of the system.

[0002]

2. Description of the Related Art A plant monitoring and control system monitors a plant operating state and further controls and controls each device, a controller for actually controlling each device, and a monitoring and control device. And a network connecting the controller device. In such a plant monitoring and control system, a trend graph for displaying a state of a monitoring target in a time-series graph is used in many systems in order to know a change in the state of the monitoring target. For example, in JP-A-10-207532, a trend graph function is realized by providing a trend data storage function in a monitoring control system.

Next, the operation will be described. In a conventional plant monitoring and control system, when performing a trend graph display, a process data transmission request is transmitted to the controller to which the process data to be displayed is input, and the process data received as a response from the controller is transmitted. it's shown. The monitoring control device transmits a process data transmission request from the monitoring control device to the controller at regular intervals. In a system that sends process data as cyclic data over a network, target process data is extracted from the cyclic data and displayed.

[0004]

The plant monitoring and control system having the conventional trend data collection system is configured as described above. Therefore, when displaying data close to actual data on the monitoring and control device, the sampling period is set to be shorter. High-speed setting is required, and the number of communications between the monitoring control device and the controller device increases. Further, when the bandwidth of the network is narrow, it is necessary to set a sampling period in consideration of the network bandwidth, and high-speed sampling cannot be realized, so that a trend graph display close to actual data becomes impossible.

[0005] The present invention has been made to solve the above-mentioned problems, and enables display of a trend graph close to actual data, as well as high-precision trend data regardless of the performance of a communication network. An object of the present invention is to provide a plant monitoring and control system for collecting.

[0006]

According to a first aspect of the present invention, there is provided a plant monitoring and control system for displaying a state of a monitoring target in a graph by transmitting process data from a controller to a monitoring and control device. Means for setting address information of process data to be collected, cycle information for sampling from the input / output unit by the controller, and cycle information for transmitting data collected from the controller to the monitoring control device are provided in the monitoring control device. Means for collecting process data based on the information and transmitting the data to the monitoring control device is provided in the controller.

A plant monitoring and control system according to a second aspect of the present invention has a disk device for storing data connected to a controller.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a plant monitoring control system according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation.
In the figure, 1 is a monitoring control device, 2 is a trend graph in the monitoring control device 1, 3 is a trend data collection unit,
4 is a request trend information setting unit for setting process data information to be collected by the trend data collection unit 3, 5 is a trend data receiving unit for receiving collected data, 6 is a controller device, and 7 is a request from the monitoring and control device 1. A collection management unit that manages trend information and further collects target process data, 8 is a data storage area that stores process data, 9 is an input / output unit that performs input / output with each control device, 1
Reference numeral 0 denotes a network connecting the monitoring control device 1 and the controller device 6.

Next, the operation will be described. The monitoring and control device 1 sends to the controller 6 the address information of the process data for which the trend data is to be collected, the sampling period of the controller 6 from the input / output unit 9, and the data collected from the controller 6 to the monitoring and control device 1. Is generated by the request trend information setting unit 4 and transmitted to the controller 6. The controller 6 collects process data from the input / output unit 9 at the cycle specified by the request trend information setting unit 4 and stores it in the data storage area 8. Also, the data is extracted from the data storage area 8 and transmitted to the monitoring and control device 1 in the data transmission period to the monitoring and control device 1 set by the request trend information setting unit 4. The processing inside the controller 6 is performed by the collection management unit 7.

In the monitoring and control apparatus 1, the collected data transmitted from the controller 6 is received by the trend data receiving section 5. With respect to the requested trend information transmitted from the monitoring control device 1 to the controller 6, the controller 6
By setting the sampling period to a high speed and setting the period to be transmitted from the controller 6 to the monitoring and control apparatus 1 to a period corresponding to the network 10, a highly accurate trend graph can be displayed even in the network 10 having a narrow communication band.

In the above system, there is no need to transmit a data transmission request from the monitoring control device 1 to the controller 6 every period, and data is transmitted from the controller 6 at regular intervals. According to this embodiment, the amount of communication between the monitoring control device 1 and the controller 6 can be reduced. In addition, since the sampling period can be set flexibly, a highly accurate trend graph can be displayed.

As described above, in the plant monitoring and control system according to the present invention, the controller 6 is provided with the process data collection / management unit 7 and the process data storage area 8, and responds to a trend data request from the monitoring and control device 1. This makes it possible to respond at high speed.

Embodiment 2 FIG. FIG. 3 is a block diagram showing a plant monitoring control system according to Embodiment 2 of the present invention, and FIG. 4 is a flowchart showing the operation. According to the present embodiment, as shown in FIG. 3, by installing the disk device 11 and storing data in the disk device 11 even when a failure occurs in the monitoring control device 1 and data transmission is impossible. In addition, the monitoring control device 1 can transmit data at the time of restoration, and data missing can be avoided. According to the present invention, process data can be collected and stored even when a failure occurs, and a more reliable monitoring and control system can be constructed.

[0014]

According to the plant monitoring and control system according to the first aspect of the present invention, the status of the monitoring target is graphically displayed by transmitting process data from the controller to the monitoring and control device. A means for setting the address information of the process data to be used, the cycle information for the controller to sample from the input / output unit, and the cycle information for transmitting the data collected from the controller to the monitor and control device is provided in the monitor and control device. A means for collecting process data and transmitting data to the monitoring and control device is provided in the controller, so the communication volume between the monitoring and control device and the controller can be reduced and a highly accurate trend graph display can be realized. it can.

According to the plant monitoring and control system according to the second aspect of the present invention, since the disk device for storing data is connected to the controller, it is possible to collect and store process data even when a failure occurs.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a plant monitoring control system according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart showing an operation of the plant monitoring and control system according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a plant monitoring control system according to Embodiment 2 of the present invention.

FIG. 4 is a flowchart showing an operation of the plant monitoring and control system according to the second embodiment of the present invention.

[Explanation of symbols]

1 supervisory control device, 6 controller, 9 input / output unit,
11 Disk device.

Claims (2)

[Claims] In a plant monitoring and control system for displaying a state of a monitoring target in a graph by transmitting process data from a controller to a monitoring and control device, address information of process data to be collected and an input / output unit Provided in the monitoring and control device means for setting the period information to sample from and the period information to transmit the data collected from the controller to the monitoring and control device, collecting process data based on the information,
And a means for transmitting data to the monitoring and control device is provided in the controller. 2. The plant monitoring and control system according to claim 1, wherein a disk device for storing data is connected to the controller.