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Model building and optimizing method for functional block program of EPA distributing control system

A technology of distributed control and system function, applied in the direction of program control in sequence/logic controller, comprehensive factory control, electrical program control, etc.

Inactive Publication Date: 2009-08-19
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a method for modeling and optimizing the function block program of the EPA distributed control system to solve the optimization problem of the system control program

Method used

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  • Model building and optimizing method for functional block program of EPA distributing control system
  • Model building and optimizing method for functional block program of EPA distributing control system
  • Model building and optimizing method for functional block program of EPA distributing control system

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Embodiment Construction

[0079] The specific embodiment of the present invention is described in detail by taking the task of controlling a running water lamp as an example.

[0080] The experimental platform is EPA fieldbus distributed control system, such as figure 2 shown. In this system, the Ethernet programmable controller PEC module is used as the main controller, supports EPA protocol, supports IEC61131-3 function block programming, has 1 Ethernet communication interface and 2 RS485 communication interfaces, supports EPA network, and supports Modbus protocol . PEC equipment can be used as an independent control module in the field, and can also expand various slave devices based on RS485 bus, including DIO series digital input and output modules, AIO series analog input and output modules, TAC series temperature control modules, etc. It can also be interconnected with other products following the standard Modbus communication protocol on any RS-485 bus, exchange data with them, form a contro...

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Abstract

The invention takes an EPA field bus distributed type control system as an experimental platform and provides a programming modeling and optimization method based on a state space model aiming at an IEC61131-3 function block diagram programming language. On the basis of constructing a mathematical model to the algorithms of all the function block encapsulations, the method respectively maps the DI, AI, DO, AO and an internal memory unit of the system into the input vector, the output vector and the state vector of the model, establishes the state space model which controls the program according to the logic relationship between the function blocks which is determined by the mathematical model of the function blocks and the configuration form of the program, and describes the interaction relationship among the system input, the internal state and the output. The invention also applies methods such as a logic algebraic formula, a Karnaugh map and a timer combination and the like to simplify the state space model, and carries out re-programming to the simplified model, thus realizing the optimization of the programming control.

Description

technical field [0001] The invention belongs to the field of computer application technology, relates to an EPA distributed field bus control system, and particularly relates to an IEC 61131-3 function block programming language of a programmable logic controller (Programmable Logic Controller, PLC). Background technique [0002] EPA (Ethernet for Plant Automation) is an industrial real-time Ethernet standard formulated by our country. It has been included in the IEC international standard and has been widely used in the field of fieldbus control systems. IEC61131-3 standardizes the unified standard of programming language syntax and semantics for PLC. Among them, the IEC61131-3 function block (Function Block, FB) modularizes the function repeatedly executed in a certain way in order to realize a certain application function or algorithm, and provides a structure to specify input, output, algorithm and control parameters. The input parameters are converted into output param...

Claims

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Application Information

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IPC IPC(8): G05B19/05G05B19/418H05B37/02
CPCY02B20/42Y02B20/40
Inventor 仲崇权刘洁杨素英张立勇李丹
Owner DALIAN UNIV OF TECH
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