CN113985843B - Method and system for updating point directory in real time by distributed control system - Google Patents

Abstract

The invention discloses a method and system for real-time updating of a point directory in a decentralized control system. The invention starts a heartbeat thread for each process control station through a host computer background program, monitors the state of the process control station in real time, and automatically updates the point directory. Update the measuring point information in the library in real time. Once the information of a measuring point changes, the content of the POU page information table where the measuring point is located changes, causing the POU page cyclic redundancy check code of the POU page information table to change, and then the POU pages of all POU page information tables are cycled The data generating device cyclic redundancy check code of the redundancy check code will also change; the present invention passes through the step-by-step inspection of the device redundancy check code check code of the process control station and the check code of the POU page information table, There is no need to upload all the measuring point information of the process control station, reducing network communication data and network communication load.

Description

A method and system for real-time updating point directory in distributed control system

technical field

The invention belongs to the field of updating the catalog of measuring points of the upper computer of the distributed control system, and in particular relates to a method and system for updating the catalog of the points of the distributed control system in real time.

Background technique

Distributed control system DCS usually adopts a hierarchical structure, each level is composed of several subsystems, and each subsystem achieves some specific limited goals, forming a pyramid structure. Reliability is the life of DCS development. There are three main measures to ensure the high reliability of DCS: first, widely use high-reliability hardware equipment and production technology; second, widely use redundant technology; third, widely realize System fault-tolerant technology, fault self-diagnosis and automatic processing technology, etc. The MTBF of most distributed control systems today can reach tens of thousands or even hundreds of thousands of hours.

The data file of each process control station generated by the logic configuration process is composed of multiple POU (Program Organization Unit) pages, and the global variables and input and output measurement points controlled by the process control station are distributed on different POU page information tables. When the engineer modifies the point directory when modifying the logic configuration, if the background of the upper computer is not updated in time, if the operator does not find out the problem of point directory update in time, it will bury hidden dangers for the follow-up work.

Contents of the invention

The object of the present invention is to overcome above-mentioned deficiency, provide a kind of method of real-time updating point list of distributed control system, can monitor the state of process control station in real time, and automatically update point list, real-time update measuring point information in the storehouse.

In order to achieve the above object, a method for real-time updating point directory of distributed control system comprises the following steps:

Get process control station information table and POU page information table;

Start a heartbeat thread for each process control station to realize control station monitoring and point directory change update, and the heartbeat thread requests the device cyclic redundancy check code from the process control station for comparison;

If the comparison is not the same, the heartbeat thread requests the POU page cyclic redundancy check codes of all POU page information tables from the process control station, and verifies;

Update the POU page cyclic redundancy check code on the POU page information table to the verified measuring point information and POU page cyclic redundancy check code;

After all POU page information tables are updated, calculate the latest device cyclic redundancy check code of the process control station according to the POU page cyclic redundancy check code stored in the current library, and update it to the database of the process control station.

The process control station information table is used to store the state information of the process control station, and the POU page information table is used to store the state information and measuring point information of the POU page.

The status information of the process control station includes the object identifier, the name of the process control station, the address of the process control station and the cyclic redundancy check code of the process control station.

The status information of the POU page includes object identifier, POU page number, process control station, POU page cyclic redundancy check code, switch measurement point and analog measurement point on the page.

The information of the measuring point includes the object identifier, the name of the measuring point, the real-time value, the process control station to which it belongs, the hardware address and whether the measuring point is valid or not.

Start a heartbeat thread for each process control station to realize the monitoring of the control station and the update of point directory changes. The heartbeat thread requests the device cyclic redundancy check code from the process control station, and the specific method of verification is as follows:

The heartbeat thread requests the device cyclic redundancy check code of the process control station from the process control station;

The heartbeat thread receives the device cyclic redundancy check code from the process control station;

Compare the obtained device cyclic redundancy check code of the process control station with the last round of device cyclic redundancy check code of the process control station saved in the process control station information table in the database. If they are the same, wait for one cycle After time, re-start a heartbeat thread for each process control station to realize the control station monitoring and point directory change update; if not the same, the heartbeat thread requests the POU page cyclic redundancy check code of all POU page information tables from the process control station , and verify.

The heartbeat thread requests the POU page cyclic redundancy check code of all POU page information tables from the process control station, and the specific method for verification is as follows:

The heartbeat thread sends a message to the process control station, requesting the POU page cyclic redundancy check code of all POU page information tables;

Receive the message from the process control station, analyze and obtain the POU page cyclic redundancy check code of all POU page information tables;

Compare the POU page cyclic redundancy check code of each POU page information table with the POU page cyclic redundancy check code of the corresponding POU page information table stored in the library;

If the comparison result of the current POU page information table is different, calculate the latest process control station device cyclic redundancy check code according to the POU page cyclic redundancy check code of the POU page information table stored in the current library, and update it to the database ;

If the comparison results of the current POU page information tables are the same, and there are unchecked POU pages, continue to check the next POU page information table until all POU page information tables are checked.

The specific method of updating the measuring point information and POU page cyclic redundancy check code on the POU page information table to the verified measuring point information and POU page cyclic redundancy check code is as follows:

Send a message to the process control station to request all the measuring point information on the information table of the POU page;

Receive the message from the process control station, analyze and obtain the latest measuring point information on the POU page information table;

Traverse all valid measuring point information in the POU page information table in the database, and determine the corresponding item in the latest measuring point information;

If there is a corresponding item, compare the measuring point information. If the comparison result is inconsistent, update the point in the database; if there is no corresponding item, delete the measuring point information in the database;

Traverse the latest measuring point information on the page, and determine the corresponding item in all valid measuring point information on the page in the database. If there is no corresponding item in the database, add the corresponding item of the measuring point information: If the identification name of the point information is consistent with the identification name of the measurement point information to be added, the invalid measurement point information is valid and its associated page and other attributes are updated; if there is no corresponding invalid item in the database, the measurement point information is added and its Associate pages with other attributes.

After the measurement point information and POU page cyclic redundancy check code on the POU page information table are updated, update the POU page cyclic redundancy check code of the POU page information table in the database to the latest value obtained from the process control station , and check the POU page cyclic redundancy check code of the POU page information table.

A system of methods for updating point catalogs in real time in a decentralized control system, comprising,

Process control station, the process control station is connected to several POU units, and each POU unit is connected to several measuring points;

The measuring point is used to generate the measuring point information table and send it to the corresponding POU unit;

The POU unit is used to store and update the corresponding measuring point information table, and generate the POU page information table;

The process control station is used to request the POU page cyclic redundancy check code of all POU page information tables from the process control station when the measurement point information changes, and verify it; the measurement point information on the POU page information table and check The code is updated to the verified measuring point information and check code; according to the POU page cyclic redundancy check code of the POU page information table stored in the current library, calculate the latest process control station device cyclic redundancy check code, and update to the database.

Compared with the prior art, the present invention starts a heartbeat thread for each process control station through the host computer background program, monitors the state of the process control station in real time, automatically updates the point directory, and updates the measuring point information in the library in real time. Once the information of a measuring point changes, the content of the POU page information table where the measuring point is located changes, causing the POU page cyclic redundancy check code of the POU page information table to change, and then the POU pages of all POU page information tables are cycled. The data generating device cyclic redundancy check code of the redundancy check code will also change; the present invention passes through the step-by-step inspection of the check code of the device redundancy check code check code of the process control station and the POU page information table, There is no need to upload all the measuring point information of the process control station, reducing network communication data and network communication load.

Description of drawings

Fig. 1 is a flowchart of the present invention;

Fig. 2 is a structural block diagram of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Fig. 1, the present invention comprises the following steps:

S1, deploy real-time data table;

Establish process control station information table, POU page information table and measuring point information table;

The process control station information table is used to store the state information of the process control station, the POU page information table is used to store the state information of the POU page, and the measuring point information table is used to store the information of the measuring point.

The state information of the process control station includes the object identifier, the name of the process control station, the address of the process control station, and the device cyclic redundancy check code of the process control station. For the process control station numbered 1001, the record information stored in the process control station information table is as follows: the object identifier is 11576001, the process control station name is process control station 1001, the process control station address is 1001 and the device of the process control station The cyclic redundancy check code is 3126643250.

The status information of the POU page includes object identifier, POU page number, process control station, POU page cyclic redundancy check code, switch measurement point and analog measurement point on the page. For the POU page numbered 32 on the process control station 1001, the record information stored in the POU page status information table is as follows: the object identifier is 210102, the POU page number is 32, the process control station it belongs to is 1001, and the POU page is cyclically redundant. The remaining check code is 3488335659.

The information of the measuring point includes the object identifier, the name of the measuring point, the real-time value, the process control station to which it belongs, the hardware address and whether the measuring point is valid or not. For the analog measurement point AI1 on the POU32 page on the process control station 1001, the record information stored in the measurement point information table is as follows: the object identifier is 43237525, the measurement point name is AI1, the real-time value is 50, and the process control station it belongs to It is 1001, the hardware address is 73974956 and whether the measuring point is valid or not, it is 1 if it is valid, and 0 if it is invalid.

S2, start a heartbeat thread for each process control station to realize control station monitoring and point directory change update, the heartbeat thread requests the device cyclic redundancy check code from the process control station, and verifies it;

S201, the heartbeat thread requests the device cyclic redundancy check code of the process control station from the process control station;

S202, the heartbeat thread receives the device cyclic redundancy check code from the process control station;

S203, comparing the obtained device cyclic redundancy check code of the process control station with the last round of device cyclic redundancy check code 3126643250 stored in the process control station information table in the database, if the device cyclic redundancy check code is 3126643250 If the remaining check codes are the same, wait for one cycle, and then execute S201 again; if the obtained device cyclic redundancy check code is 3462475486, which is different from that in the library, execute S3.

S3, the heartbeat thread requests the POU page cyclic redundancy check codes of all POU page information tables from the process control station, and verifies;

S301, the heartbeat thread sends a message to the process control station, requesting the POU page cyclic redundancy check codes of all POU page information tables;

S302, receiving the message from the process control station, analyzing and obtaining the POU page cyclic redundancy check codes of all POU page information tables;

S303, comparing the POU page cyclic redundancy check code of each POU page information table with the POU page cyclic redundancy check code of the corresponding POU page information table stored in the library;

For the POU page numbered 32 on the process control station 1001, the POU page cyclic redundancy check code stored in the library is 3488335659, if the POU page cyclic redundancy check code sent by the process control station is 5234643747, the comparison result is different, execute S4;

If the POU page cyclic redundancy check code of the page sent by the process control station is 3488335659, the comparison result of the No. 32 POU page information table is the same, and there are unchecked POU pages, then proceed to the next POU page information Table verification until all POU page information tables are verified.

S4, update the measuring point information and the POU page cyclic redundancy check code on the corresponding POU page information table with the verified measuring point information and the POU page cyclic redundancy check code:

S401, sending a message to the process control station, requesting all the measuring point information on the information table of the POU page;

Receive the message from the process control station, analyze and obtain the latest measuring point information on the POU page information table;

S402. Traversing all valid measuring point information in the POU page information table in the database, determining the corresponding item in the latest measuring point information, simulating the measuring point AI1 for the instance in the database, and determining the corresponding item in the latest measuring point information.

If there is an analog measuring point AI1 in the process control station, compare the information of the measuring points. If the comparison results are inconsistent, update the information of the point in the library, mainly including the hardware address, whether the measuring point is valid, etc.; if there is no corresponding item , then delete the analog measurement point AI1 in the database;

S403, traversing the latest measuring point information on the page, determining the corresponding item in all valid measuring point information on the page in the database, if there is no corresponding item in the database, then increasing the corresponding item of the measuring point information: if the database has If the identification name of the invalid measurement point information is consistent with the identification name of the measurement point information to be added, the invalid measurement point information will be valid and its associated page and other attributes will be updated; if there is no corresponding invalid item in the database, the measurement point information will be added, and Set its associated page and other properties.

S404, the POU page cyclic redundancy check code of the POU page information table in the database is updated to the latest value obtained from the process control station, and S3 is executed to check the POU page cyclic redundancy check code of the POU page information table.

S5, after all POU page information tables are checked and the measurement point information table is updated, calculate the device cyclic redundancy check code of the latest process control station according to the POU page cyclic redundancy check code of the POU page information table stored in the current library Code verification, and update to the database, and execute S2.

Referring to Fig. 2, a distributed control system real-time update point directory system, including a process control station, the process control station is connected to a number of POU units, each POU unit is connected to a number of measurement points; the measurement points are used to generate a measurement point information table and sent to the corresponding In the POU unit; the POU unit is used to store and update the corresponding measuring point information table, and generate the POU page information table; the process control station is used to request all POU page information tables from the process control station when the measuring point information changes POU page cyclic redundancy check code, and verify it; update the measuring point information and POU page cyclic redundancy check code on the POU page information table to the verified measuring point information and POU page cyclic redundancy check code; According to the POU page cyclic redundancy check code of the POU page information table stored in the current library, calculate the latest device cyclic redundancy check code of the process control station, and update it into the database.

The measuring points of the process control station are distributed on different POU page information tables, and the POU is the program organization unit.

POU Program Organization Unit (Programming Organization Unit) is an important and widely used basic IEC programming unit in the IEC61131-3 standard.

The host computer background program of the present invention starts a heartbeat thread for each process control station, monitors the state of the process control station in real time, automatically updates the point directory, and updates the measuring point information in the database in real time. Once the information of a measuring point changes, the content of the POU page information table where the measuring point is located changes, causing the POU page cyclic redundancy check code of the POU page information table to change, and then the cyclic redundancy check codes of all POU pages are changed. The cyclic redundancy check code of the data generation device will also change. The invention does not need to upload all measuring point information of the process control station, thereby reducing network communication data.

Claims (10)

1. A method for updating a point directory in real time by a distributed control system is characterized by comprising the following steps:

acquiring a process control station information table and a POU page information table;

starting a heartbeat thread for realizing control station monitoring and point directory change updating for each process control station, wherein the heartbeat thread requests a device cyclic redundancy check code from the process control station and compares the cyclic redundancy check code with the device cyclic redundancy check code;

if the comparison is different, the heartbeat thread requests POU page cyclic redundancy check codes of all POU page information tables from the process control station and verifies the POU page cyclic redundancy check codes;

updating the POU page cyclic redundancy check code on the POU page information table into verified measuring point information and a POU page cyclic redundancy check code;

and after the updating of all POU page information tables is finished, calculating the latest device cyclic redundancy check code of the process control station according to the POU page cyclic redundancy check code stored in the current library, and updating the latest device cyclic redundancy check code into the database of the process control station.

2. The method as claimed in claim 1, wherein the process control station information table is used for storing status information of the process control station, and the POU page information table is used for storing status information and measurement point information of POU pages.

3. The method of claim 2, wherein the status information of the process control station includes an object identifier, a process control station name, a process control station address, and a process control station cyclic redundancy check code.

4. The method of claim 2, wherein the status information of the POU page includes an object identifier, a POU page number, a process control station, a POU page crc code, a switch measurement point and an analog measurement point.

5. The method of claim 2, wherein the information about the measured point includes an object identifier, a name of the measured point, a real-time value, an address of the associated process control station, a hardware address, and information about whether the measured point is valid.

6. The method for updating the point directory of the distributed control system in real time as claimed in claim 1, wherein a heartbeat thread for realizing control station monitoring and point directory change updating is started for each process control station, and the heartbeat thread requests a cyclic redundancy check code of the device from the process control station and carries out verification by the specific method as follows:

the heartbeat thread requests a device cyclic redundancy check code of the process control station from the process control station;

receiving a device cyclic redundancy check code from a process control station by a heartbeat thread;

comparing the obtained device cyclic redundancy check code of the process control station with the device cyclic redundancy check code of the process control station in the previous round stored in the process control station information table in the database, if the obtained device cyclic redundancy check codes are the same, waiting for a period of time, and then restarting a heartbeat thread for realizing control station monitoring and point directory change updating for each process control station; and if not, the heartbeat thread requests POU page cyclic redundancy check codes of all POU page information tables from the process control station and verifies the POU page cyclic redundancy check codes.

7. The method for updating the point directory in real time by the distributed control system as claimed in claim 1, wherein the heartbeat thread requests the POU page cyclic redundancy check codes of all POU page information tables from the process control station, and the specific method for verifying the POU page cyclic redundancy check codes is as follows:

the heartbeat thread sends a message to the process control station to request POU page cyclic redundancy check codes of all POU page information tables;

receiving messages from a process control station, and analyzing and acquiring POU page cyclic redundancy check codes of all POU page information tables;

comparing the POU page cyclic redundancy check code of each POU page information table with the POU page cyclic redundancy check code of the corresponding POU page information table stored in the library;

if the comparison results of the current POU page information tables are different, calculating the latest cyclic redundancy check code of the process control station device according to the POU page cyclic redundancy check code of the POU page information table stored in the current library, and updating the latest cyclic redundancy check code into the database;

and if the comparison results of the current POU page information tables are the same and the POU pages which are not checked exist, continuing to check the next POU page information table until all the POU page information tables are checked.

8. The method for updating the point catalog in real time by the distributed control system as claimed in claim 1, wherein the specific method for updating the point information and the cyclic redundancy check code of the POU page on the POU page information table to the verified point information and the cyclic redundancy check code of the POU page is as follows:

sending a message to a process control station to request all the measuring point information on the POU page information table;

receiving a message from a process control station, and analyzing and acquiring the latest measuring point information on the POU page information table;

traversing all effective measuring point information of the POU page information table in the database, and determining a corresponding item in the latest measuring point information;

if the corresponding item exists, comparing the measured point information, and if the comparison result is inconsistent, updating the point in the library; if no corresponding item exists, deleting the measuring point information in the database;

traversing the latest measuring point information of the page, determining corresponding items in all effective measuring point information of the page in the database, and if the database does not have corresponding items, adding the corresponding items of the measuring point information: if the identification name of the invalid measuring point information in the database is consistent with the identification name of the measuring point information to be added, setting the invalid measuring point information to be valid and updating the associated page and other attributes of the invalid measuring point information; and if the database does not have the corresponding invalid item, adding the measuring point information, and setting the associated page and other attributes of the measuring point information.

9. The method as claimed in claim 1, wherein after the point information and the POU page crc on the POU page information table are updated, the POU page crc of the POU page information table in the database is updated to the latest value obtained from the process control station, and the POU page crc of the POU page information table is checked.

10. A system for a method of updating a point directory in real time by a distributed control system, comprising,

the process control station is connected with a plurality of POU units, and each POU unit is connected with a plurality of measuring points;

the measuring points are used for generating a measuring point information table and sending the measuring point information table to the corresponding POU units;

the POU unit is used for storing and updating the corresponding measuring point information table and generating a POU page information table;

the process control station is used for requesting POU page cyclic redundancy check codes of all POU page information tables from the process control station and verifying the POU page cyclic redundancy check codes when the measuring point information changes; updating the measuring point information and the check code on the POU page information table into verified measuring point information and check code; and calculating the latest device cyclic redundancy check code of the process control station according to the POU page cyclic redundancy check code of the POU page information table stored in the current library, and updating the latest device cyclic redundancy check code into the database.

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