JPS62194516A - Plant supervisory and control system - Google Patents

Abstract

PURPOSE:To regenerate a plant state within a plant supervisory and control system by storing all process inputs and control information which are handled by a system computer in an external memory device synchronously with the input cycle and therefore analyzing the past plant state by the resolution synchronous with the transition of said plant state. CONSTITUTION:The process value (a) received from a plant is inputted to plural control system computers 1' of a plant supervisory and control system. Then, a control output signal (c') is inputted for each control group of the plant. At the same time, the value (a) is supplied to an integrated supervisory and control computer 1 for output of a control signal (c) to each computer 1' or the entire system. Thus, an operator can operate an operator conversation device 6. An external memory device 5 which can hold the plant data and the control information is connected to both computer 1 and 1'. A process state memory processing means 4 secures the synchronization between the value (a) and the input processing end signal (d) received from a process input processing means 2. Then the process input and the control information are stored in the device 6.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a distributed hierarchical control system, in which past plan data and control information are stored in an external storage device for each individual control system, and the stored data is used as a basis. The present invention relates to a plant monitoring and control system equipped with a plant state analysis means for reproducing and analyzing the plant state and control state for each control system or any combination of control systems.

[Technical Background of the Invention and its Problems] Recent plant monitoring and control systems have become more comprehensively digitalized, and each plant control system is equipped with a plurality of microcomputer-applied digital control devices (hereinafter simply referred to as control system controllers). A distributed hierarchical control system is being adopted, which consists of a control computer (referred to as a "junki") and an integrated monitoring and control computer that supervises these and monitors the entire plant and issues control commands.

However, in this type of conventional system, plan mill monitoring and control is performed only between processes processed by a controlling computer, and some past operating data is saved in chronological order to monitor the plant status. Since only one operation history to be stored is processed, accurate data for the entire plant could not be obtained. In addition, since the data recording equipment and recording calculations used to analyze the existing plant status are directly connected to the plant side, the calculations for the υ control system are different from the above operating layer thickness data seen from the side. This data was not complete enough to be used as direct data to analyze the control status of each control system recalculator.

Furthermore, in the conventional operation history processing, recording is limited to specific process quantities that are considered necessary to judge the plant status due to computer load or storage capacity constraints. The limit was to achieve a period several to several tens of times as long as the actual plant monitoring and control period. Furthermore, with data stored through such processing, it is not only impossible to perform detailed analysis of plant conditions and control system operations, but also the storage of specific process quantities does not allow for the data necessary for analysis to be performed. , in many cases they were not even remembered.

[Object of the Invention] The present invention was made to solve the above-mentioned problems, and its purpose is to synchronize all process inputs and control information handled by each control system computer in the system with the input cycle. The present invention provides a plant condition analysis means that can analyze past plant conditions at a resolution synchronized with changes in plant conditions by storing them in an external storage device, and reproduce the plant conditions within the system. The purpose of the present invention is to provide a plant monitoring and control system with the following features.

[Steamed beans of the invention] In order to achieve the above object, the present invention provides calculations for a plurality of control systems that input process amounts from a plant and control the plants for each control group, and In a distributed hierarchical control system that includes an integrated monitoring and control computer that inputs the quantity, integrates the computers for each of the control systems mentioned above, and monitors and controls the entire plant, and an operator dialogue device that can be operated by an operator. , an external storage device that can store plant data and control information in each of the above control system meters and the overall monitoring and control computer, and plant data and control information at a timing synchronized with the input cycle of process quantities from the above plants. A process state storage processing means for storing control information in the external storage device is provided, and furthermore, according to the analysis reproduction time period and control system range specified by the operator in the operator dialogue device, the external storage processing means for each of the control system computers is provided. By providing a process state analysis processing means that reads and analyzes data stored in a storage device, and a process state reproduction processing means that reproduces and outputs the results analyzed by this process state analysis processing means, the plant state and control can be improved. It is characterized by being able to reproduce all layer thickness data of the state.

[Embodiments of the invention] An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 is a functional block diagram showing an example of the configuration of a plant monitoring and control system equipped with plant condition analysis means according to the present invention. In FIG. 1, the plant monitoring and control system according to the present embodiment includes a plurality of control system computers 1' that input a process amount a from a plant and issue a control output signal C' for each control group of the plant.
(Only one unit is shown in this figure) and a general monitor that inputs the process a from the above plant and issues a control output signal C to each of the control system computers 1' or the entire plant. A distributed hierarchical control system includes a control computer 1 and an operator interaction device 6 that can be operated by an operator.

This embodiment is characterized by an external storage device 5 capable of storing plant data and control information in each of the control system computers 1' and the general control system computer 1.
, and a process state storage processing means 4 for storing plant data and control information in the external storage device 5 at a timing synchronized with the cycle of process amount input from the plant by the process input processing means 2, and further for the above-mentioned operator dialogue. The device 6 reads the data saved from the external storage device 5 of each control system computer 1' according to the analysis reproduction time period and control system range specified by the operator via the operator interaction processing means 7. The process state analysis processing means 8 for analyzing the process state and the process state reproduction processing means 9 for reproducing and outputting the results analyzed by the process state analysis processing means 8 are provided. In the figure, 3 emits control signals c and c' based on the process input data b input and processed by the process input processing means 2, and
Plant monitoring sub-means for emitting process input information and plant control information e.

In a system with such a configuration, the process input means 2 receives the four process inputs a from the plant, converts them into digital data that can be stored on the main memory of the computer, and sends them to the plant monitoring and control processing means as process input data b. Output to 3.

The plant monitoring control processing means 3 that has received this process input data b uses the process input data b to determine the plant state and performs necessary control.

An output signal C is outputted to the plant or control system computer 1', and at the same time, process input information and plant control information e are outputted to the process state storage processing means 4. Further, the process state storage processing means 4 receives the process input processing completion signal d from the process input processing means 2, and stores the above-mentioned information e to the external storage device 5 in synchronization with the process input processing.
It is sent as storage information f to be stored.

In this case, the data format of the stored information f is as shown in FIG. 3<a>, with the data management label at the beginning and the input data 1. Input data 2. . . . consists of input data X, and each data structure is as shown in FIG.
Time, analog data 1° analog data 2.・・・・・・
..., analog data Xa.

Digital data 1. Digital data 2.・・・・・・、
Digital data xb, control information 1. Control information 2. ...
..., control information XC, and collectively stores all process data and control information handled by the plant monitoring control processing means 3.

Next, the process state storage processing means 4 performs processing as shown in FIG. That is, in response to the input completion signal d from the process input processing means 2 described above, the data editing processing means 41 reads the process input information and plant control information e used by the plant monitoring control processing means 3, and reads the process input information and the plant control information e used by the plant monitoring control processing means 3, as shown in FIG. The editing data m is outputted to the data editing buffer management means 42 in a format that combines the time and input information as shown in FIG.

Since the storage speed of the external storage device ra5 takes longer than the period in which the process input completion signal d is given, the data editing buffer management means 42 provides a temporary storage buffer to prevent loss of stored data. When 11 write units or more of data are accumulated in the buffer, a write command n is output. Upon receiving this write command n, the write processing means 43 takes out the data from the data editing buffer management means 42 and writes it into the external storage device 5.

Next, a process for analyzing past plant conditions using data stored in the external storage device 5 will be described.

In this case, first, an operator command j is input from the operator dialogue device 6 connected to the integrated monitoring and control calculation 111 to the operator dialogue processing means 7, and the contents of this operator command j (the time period to be reproduced, According to the plant control range), an analysis start command i is output to the process state analysis processing means 8 of the integrated monitoring and control calculation unit 1 or the control system unit uni'. As a result, the process state analysis processing means 8 reads out the process input information and plant control storage information Q for the requested time period from the external storage device 5 in accordance with the above-mentioned analysis start command 1, and sequentially sends the process state reproduction processing means 9 to the process state reproduction processing means 9 according to the time transition. Output process state reproduction data h.

Then, the process state reproduction processing means 9 that receives the process state reproduction data h outputs the process input reproduction data 1 to the operator interaction device 6.

As a result, the integrated monitoring and control computer 1 sequentially reproduces and outputs the past plant status and the control status of each burial system computer by CRT display or printer printout based on the reproduced process input reproduction f-tar C. It is possible to analyze the plant state of the distributed hierarchical control system and the control state of each control system calculation FjM1'. Further, in this case, the retransmission factor can also be arbitrarily set based on the process input processing cycle.

As described above, in this embodiment, the plant status and the control status of the control system computer 1 that controls the plant are collected and stored as continuous real-time records, rather than piecemeal as in the past. This not only makes it possible to reliably prevent situations in which analysis is not possible due to missing plant status data when analyzing plant accidents, etc., but also allows computers for each control system in a distributed hierarchical control system to 1' control information;
control system h] total t[1
It is also possible to analyze the controllability of '.

[Effects of the Invention] As explained above, according to the present invention, it is possible to analyze past plant conditions at a resolution that is synchronized with changes in plant conditions, and to realize reproduction of the plant conditions within the system. A plant monitoring and control system equipped with state analysis means can be provided.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing one embodiment of the present invention;
The figure is a functional block diagram showing details of the process state storage processing means in the same embodiment, and FIG. 3 (a>(b) is a diagram showing the data format stored in the external storage device. 1... General monitoring control computer for use, 2... calculation unit for control system, 3... blunt monitoring control processing means, 4...
・Process state storage processing means, 5...external storage device,
6... Operator dialogue device, 7... Operator dialogue processing means, 8... Process state analysis processing means, 9...
- Process state reproduction processing means, 41... Data editing processing means, 42... Data editing buffer management means, 4
3...Writing processing means. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A plurality of control system computers that input process quantities from a plant and control the plant for each control group; Monitoring/
In a distributed hierarchical control system that includes a computer for controlling integrated monitoring and control and an operator interaction device that can be operated by an operator, plant data and control information are stored in each of the computers for the control system and the computer for integrated monitoring and control. an external storage device capable of storing information; and a process state storage processing means for storing plant data and control information in the external storage device at a timing synchronized with a cycle of inputting process quantities from the plant; A process state analysis processing means for reading and analyzing data stored in an external storage device of each of the control system computers according to the analysis reproduction time period and control system range specified by the operator using the operator dialogue device, and this process. A plant monitoring and control system characterized in that each process state reproduction processing means is provided for reproducing and outputting the results analyzed by the state analysis processing means.