JPH05137177A - Decentralized hierarchical plant data collecting and monitor device - Google Patents

Abstract

PURPOSE:To minimize the communication down time. CONSTITUTION:A timer circuit 20 measures the response reception time. An operation control part arithmetic part 22 calculates inference information corresponding to the response reception time and reads in the address of inference information in an inference information table corresponding to this inference information. Respective error information collected from an error information collecting function part are calculated, and the address of error information in an error information table corresponding to error information specified by this calculation is read in. Communication trouble information preserved in the area of the address of a knowledge data base table specified by these read addresses is read in and inferred, and inferered communication trouble information is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed hierarchical plant data recording / monitoring apparatus suitable for analysis and preventive maintenance of communication failures between a higher-level plant data recording / monitoring apparatus and a simplified data processing apparatus connected by a network. Regarding

[0002]

2. Description of the Related Art A distributed hierarchical plant data recording / monitoring device, which is connected to a plurality of control devices for distributed control by a network and has a central computer for centralized monitoring, is a large-scale power plant for thermal power, nuclear power, etc. It has been put to practical use in many industrial plants such as steel and chemicals.

For example, FIG. 7 shows a conventional distributed hierarchical plant data recording / monitoring device for centrally monitoring a thermal power plant.

This distributed hierarchical plant data recording / monitoring device is provided with a distributed control controller 1 for distributed control of a plant. This distributed control controller 1 is a station 3 for transmitting data with a plant data transmission line 2. It is connected to the central computer 4 and the plant monitoring device 5 by a network consisting of
It is connected to the plant data recording and monitoring device 8 via 7. The decentralized control device 1 is connected to a simplified data processing device 9 for recording and processing plant signals, etc. The simplified data processing device 9 is connected to a plant data recording / monitoring device 8 via a transmission line 10. ing.

Reference numeral 11 is a plant signal, 12 is a process signal, 13 is a terminal device connected to the central computer 4, and 14 is a terminal device connected to the plant monitoring device 5.

This distributed hierarchical plant data recording / monitoring device is used for centralized monitoring of a plant signal 11, a process signal, a process signal 12 and the like input / output to / from a plant by a distributed control device 1 for distributed control via a network. The data is transmitted to the central computer 4 and the plant monitoring device 5 and taken into the plant data recording and monitoring device. On the other hand, the above-mentioned plant data is dispersedly recorded, saved, and analyzed by the simplified data processing device 9, and this plant data is taken into the plant data recording / monitoring device 8.

The reason why the distributed hierarchical plant data recording / monitoring apparatus is configured in this way is as follows.

That is, in the data rings 6 and 7 between the plant data recording / monitoring device 8 and the central computer 4 or the plant monitoring device 5, since the calculation cycle requires several seconds, several msec.
It is impossible to record the plant data requiring the control cycle for a long time in terms of data storage or in terms of capacity. Therefore, the plant information, the process information, the digital information and the like are fetched from another dedicated controller 1 for distributed control. Furthermore, during data recording monitoring of several seconds to several tens of seconds, it is not necessary to record data in synchronization with data recording of several msec. In this case, if the plant data recording / monitoring device 8 preferentially records the data of several msec, the storage capacity of the data recording unit becomes insufficient.

Therefore, the plant data from the central computer 4 or the plant monitoring device 5 and each distributed control device 1 is converted into data of fast operating time and plant data of slow operating time according to the cycle time of the plant data. Distinguish. Then, according to the purpose of data recording, data is recorded from the decentralized control device 1 to the plant data recording / monitoring device 8 through the plant data transmission line 2, while the simplified data processing device 9 records a large amount of plant data. It is designed so that it can be displayed and analyzed.

[0010]

However, the above distributed hierarchical plant data recording and monitoring apparatus has the following problems regarding data transmission.

First, in the plant data recording / monitoring device 8 and the simplified data processing device 9, when the network communication system is down due to a cause such as a program stop or a system failure, a dedicated program is used to determine whether each device is normal or abnormal. Was being made. Further, in each of the simplified data processing devices 9, a failure is distinguished and determined for each device by a dedicated test program, and the communication failure of the network has not been analyzed from the entire system. Therefore, there is a problem that it takes a long time to solve the communication failure, which leads to data transmission, deterioration of communication efficiency, and the like.

In order to solve this problem, analysis of the failure of the entire system is indispensable, and the failure location is inferred to accurately grasp the error information from each device,
It is necessary to localize the failure point and minimize the communication down time.

Therefore, an object of the present invention is to provide a distributed hierarchical plant data recording / monitoring device capable of inferring a fault location of a communication system of a network and preventive maintenance of the fault location.

[0014]

DISCLOSURE OF THE INVENTION The present invention is a distributed control device for distributed control of a plant, a simplified data processing device for recording and processing data from the distributed control device, and a simplified data processing device. A data transmission line input / output unit for transmitting data of the data processing device to a higher order, a communication circuit for transmitting data, a data transmission line input / output unit for transmitting / receiving data via this communication circuit, and a comprehensive data In a distributed hierarchical plant data recording / monitoring device configured to record and monitor a plant data recording / monitoring device, a data is transmitted to the communication circuit, and a response is received from the communication circuit in response to the data. A transmission / reception circuit that receives the data and measures the response reception time from when the data is transmitted to when the response reception data is received. A timer circuit, an error information collection function unit for collecting abnormality of communication equipment as each error information, an inference information table storing each inference information according to the response reception time, and each of the error information. It consists of a stored error information table and a knowledge database table in which communication failure information as knowledge information is accumulated and stored in an area of an address specified by the address of these inference information table and the address of the error information table. The inference information is calculated according to the knowledge section and the response reception time, the address of the inference information in the inference information table corresponding to the calculated inference information is read, and each of the information collected from the error information collection function section is read. The error information is calculated, and the error in the error information table corresponding to the error information specified by this calculation An information control unit for reading out and inferring communication fault information stored in the address area of the knowledge database table specified by each of the read addresses, and outputting the inferred communication fault information. Means for providing the simplified data processing device.

[0015]

With the above configuration, when a communication failure occurs,
It is possible to infer which device has a failure and minimize the failure time to improve the operation rate of data processing, analysis, and storage operations by data transmission. Furthermore, before a failure occurs, the location of the failure can be predicted and the preventive maintenance of the communication system can be operated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a distributed hierarchical plant data recording / monitoring apparatus showing an embodiment of the present invention. The same reference numerals as those in FIG. 7 indicate the same or corresponding portions.

In this embodiment, a decentralized control device 1 for decentralized control of a thermal power plant and the decentralized control device 1 are provided.
And a data transmission line input / output unit 15 for transmitting plant data and the like of the simplified data processing device 9 to a higher level A communication line 16 for data transmission, a data transmission line input / output unit 17 for data transmission via the communication line 16, and a plant data recording / monitoring device 8 for comprehensively recording and monitoring plant data.

Here, the decentralized control device 1 inputs a plant signal or a digital signal from the thermal power plant, and outputs a control signal to decentralize the control of the thermal power plant. The plant data recording / monitoring device 8 is a communication line 1
6 has a plant data recording / monitoring calculation function and a communication failure information inference function described later. The simplified data processing device 9 has a calculation function and a communication failure information inference function described later.

The communication method between the plant data recording / monitoring device 8 and the simplified data processing device 9 through the communication line 16 is as follows: 1: 1 communication peer-to-peer communication system or 1: n communication radiating communication system. Although classified as
Since the plant data recording / monitoring device 8 and the simplified data processing device 9 both have a computer function, the transmission / reception method of each message communicates by allocating the synchronization time of each device, and this communication is performed in the main storage unit. Is being allocated.

In this case, although there is no problem in the above 1: 1 communication, in the above 1: n communication, the method of putting data on the communication line 16 is determined by weighting each data in the main memory.

Here, the case of 1: 1 communication as shown in FIG. 2 will be briefly described.

The simplified data processing device 9 includes a communication line 16
Network communication control section 18 for receiving the signal of FIG. 2 via data transmission line input / output section 15, transmission / reception circuit 19 for transmitting / receiving data, timer circuit 20 for monitoring response reception time, and communication signal failure In order to prevent this, a failure prevention circuit 21 that collects positive response times and stores statistical information, a calculation unit 22 that performs calculation, an error information collection function unit 25, a main storage unit 26, and a man-machine interface unit 27. , A knowledge acquisition function unit 31 and a knowledge unit 32.

The calculation unit 22 comprises a terminal control unit 23 and a calculation control unit 24. When a failure occurs in the communication line 16, the calculation control unit 24 calculates the inference information according to the type of response to the transmitted data and the response time. The error information collecting function unit 25 has a function of collecting information of the communication system such as information indicating an error in the communication circuit via the man-machine interface unit 27, and the error information is stored in the main storage unit 26. It

The man-machine interface unit 27 outputs fault information and the like inferred by the arithmetic unit 22 by the CRT 28 and the hard copy printer 29, and inputs error information and the like from the keyboard 30.

The knowledge acquisition function unit 31 inputs communication system information such as error information and stores it in the main storage unit 26.

The knowledge section 32 will be described in detail later, but the computing section 2
Fault information is accumulated as knowledge information based on the inference information and the error information according to 2. The calculation unit 22 is
The knowledge base unit 32 infers fault information.

FIG. 3 is a detailed diagram of the arithmetic control unit shown in FIG.

In the arithmetic control unit 24, when the communication abnormality detection unit 33 detects a negative response after a predetermined time passes through the terminal control unit 23, the communication abnormality detection unit 33 gives a negative response based on the time after the predetermined time. To detect that.

For example, in the case of a negative response, it is inferred and calculated whether collision re-transmission is over due to a cable break in the communication line 16. The abnormality analysis unit 34 provides the operator with the fault information of the communication line 16 of the transmission source having the highest priority level from the inference information of the knowledge unit 32 and the error information based on the inference and calculation results through the man-machine interface unit 27. ..

FIG. 4 is a flow chart showing a procedure for inferring and calculating communication failure information in this embodiment.

First, data is transmitted from the network communication control unit 18 to the plant data recording / monitoring device 8 (1
01). After the transmission is completed, the timer circuit 20 is started and the response reception is monitored (102).

Next, it is judged whether or not a response is received (103). If a response is received from the plant data recording / monitoring device 8 via the communication line 16, the response receiving time is read from the timer circuit 20 (104). Then, the type of response is determined from the response reception time whether the response is normal or not (105). If it is determined that the response is normal, the response reception time statistical information is collected and stored in the main storage unit 26 as preventive maintenance data for communication failure of the communication line 16 (106) (107). In addition, when it is determined whether the response reception is normal (105), that is, an incorrect response or an abnormal response, the inference information calculation unit 35 outputs the incorrect response or the abnormal response signal.
(108). The inference information calculation unit 35 infers the failure information based on the knowledge information of the knowledge unit 32 and outputs the failure information (109) (110).

On the other hand, if the response reception is not completed within the regulation time, it is judged from the time from the timer circuit 20 and a non-response signal is output to the inference information calculation unit 35 (111).
Thereby, the inference information calculation unit 35 infers the failure information based on the knowledge unit 32 and outputs the failure information (112).
(113).

FIG. 5 shows the relationship among the inference information operation unit 35, the knowledge unit 32, the main storage unit 26, and the man-machine interface unit 27 in the operation control unit 24.

The knowledge section 32 is as shown in FIG.
The vertical axis represents the inference information table 32a that stores the respective inference information according to the response reception time, the horizontal axis represents the error information table 32b that stores the respective error information, and the addresses and error information tables of these inference information tables 32a. 32
The knowledge database table 32c stores and stores communication failure information as knowledge information in the area of the address specified by the address b. The inference information calculation unit 35 of the calculation control unit 24 calculates the inference information according to the response reception time, reads the address of the inference information of the inference information table 32a corresponding to the calculated inference information, and further collects the error information. Each error information collected from the function unit 25 and stored in the main storage unit 26 is calculated, the address of the error information of the error information table 32b corresponding to the error information specified by this calculation is read, and each of these read information is read. The communication failure information stored in the address area of the knowledge database table 32c specified by the address is read and inferred.

For example, the inference information calculation unit 35 uses No. of the inference information table 32a on the vertical axis. “Negative response after timer time” of No. 1 is calculated, and No. 1 of the error information table 32b on the horizontal axis is calculated. It is assumed that "Error display on communication line" of 1 is calculated. In this case, the inference information calculation unit 35 determines the vertical axis N of the matrix of the knowledge database table 32c.
o. 1 and the horizontal axis No. "No. 1 sync cable abnormality" specified by 1 and 1 is inferred as communication failure information. As a result, the transmission of plant data on the network is monitored through the communication line 16, and the failure location can be inferred and the failure preventive maintenance can be performed.

As described above, regarding the preventive maintenance of the failure point and the inference, first, the kind of response to the transmitted data and the difference in the time until the response is received are monitored. Further, in order to accurately grasp the fault information of the network and localize the fault location, the inference information and the error information are addressed, and the fault information as knowledge information is stored in a table in a matrix specified by this address. Then, the analysis is sequentially performed according to the contents of the table.

Further, in the acquisition and removal of the inference knowledge, the fault information in the table corresponding to the addresses of the inference information and the error information is rewritten. The type of response and the response reception time until there is a response depend on the number of retras, response timeout, etc. in each communication device or protocol from when the data finally arrives at the plant data recording and monitoring device until the response is sent to the sender. different.

Generally, in a 1: n type radial type communication system or a 1: 1 type peer-to-peer type communication system, the longer a failure occurs at a location closer to the transmission source, the more time the negative response is returned to the transmission source. Get faster Therefore, if this time is used, the failure location can be inferred. In addition, the response time may be delayed because the failure is not reached and the job is saved by the retry. This time is called statistical information, and by updating this statistical information,
The failure location can be predicted in advance.

For localization of faults, the inference information and the error information of the distributed simple data processing devices are used as a matrix, and the fault information corresponding to each is given priority levels in order of importance of the fault location. To store.
When a failure occurs, the failure information is provided to the operator or the like and localized for the information inferred from the matrix in the priority order of the table. Thus, when a failure occurs, the failure information can be accurately grasped and the failure location can be detected.

The knowledge database can be learned, removed, modified, etc. easily by rewriting or clearing the numerical value of the address priority level of the table contents.

[0043]

As described above, according to the present invention, when a failure occurs in a communication line, communication failure information is output based on the knowledge database. As a result, it is possible to infer the location of communication failure and preventive maintenance of the failure. Therefore, since the communication failure time can be minimized and the communication failure location can be localized, the occurrence of the communication failure can be overlooked, and the communication failure location is rarely misjudged, so that time is not wasted.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a distributed hierarchical plant data recording and monitoring apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the simplified data processing device of FIG.

3 is a configuration diagram of an arithmetic control unit provided in the simplified data processing device of FIG.

4 is a flowchart of inference operation of the simplified data processing device of FIG.

5 is an explanatory diagram showing an inference information calculation unit and a knowledge unit of the calculation control unit in FIG.

6 is a configuration diagram of a knowledge unit shown in FIG. 5;

FIG. 7 is a configuration diagram of a distributed hierarchical plant data recording / monitoring device showing a conventional example.

[Explanation of symbols]

 17 data transmission line input / output unit 18 network communication control unit 19 transmission / reception circuit 20 timer circuit 21 failure prevention circuit 22 calculation unit 23 terminal control unit 24 calculation control unit 25 error information collection function unit 26 main storage unit 27 man-machine interface unit 31 knowledge Acquisition function section 32 Knowledge section

Claims (1)

[Claims] 1. A control device for distributed control for distributed control of a plant, a simplified data processing device for recording and processing data from this distributed control device, and data of this simplified data processing device in a higher order. Data transmission line input / output unit for transmission, communication circuit for transmitting data, data transmission line input / output unit for transmitting / receiving data via this communication circuit, and plant data recording for comprehensively recording and monitoring data In a distributed hierarchical plant data recording and monitoring device configured with a monitoring device, a transmission / reception circuit that transmits data to the communication circuit and receives data that is a response to the data from the communication circuit as response reception data, A timer circuit that measures a response reception time from when the data is transmitted to when the response reception data is received, and a communication device. Error information collecting function unit for collecting the abnormality of each as error information, an inference information table storing each inference information according to the response reception time, and an error information table storing each error information A knowledge section including a knowledge database table storing and storing communication failure information as knowledge information in an area of an address specified by the address of the inference information table and the address of the error information table, and the response. The inference information according to the reception time is calculated, the address of the inference information of the inference information table corresponding to the calculated inference information is read, and each error information collected from the error information collection function unit is calculated, Read the error information address of the error information table corresponding to the error information specified by this operation An arithmetic control unit for reading and inferring communication failure information stored in an address area of the knowledge database table specified by each of the read addresses; and means for outputting the inferred communication failure information. A distributed hierarchical plant data recording / monitoring device, which is provided in a simplified data processing device.