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Sequential control method and system in plc

A sequence control system and sequence control technology, applied in the field of software programming, can solve the problems of occupying a large PLC storage space and low control efficiency

Active Publication Date: 2018-09-11
BEIJING GRANT MEMBRANE SEPARATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a sequence control method in PLC that does not need to occupy a large PLC storage space and has high control efficiency for the general PLC sequential control method that requires a large PLC storage space and low control efficiency. system

Method used

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  • Sequential control method and system in plc
  • Sequential control method and system in plc
  • Sequential control method and system in plc

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Embodiment Construction

[0019] The programming language in PLC includes text programming language ST and sequential function chart SFC. Among them, the sequential function chart SFC programming language has strong program readability, and the action sequence of the equipment can be seen intuitively. When the equipment fails, it is easy to find the fault location. In the position, there is no need for complicated interlocking programs, and it is easier to design and maintain the system. However, in order to realize the above-mentioned diversified and comprehensive functions of the sequential function chart SFC programming language, its programming language needs to be compared with the text programming language ST It is much more complicated, and many contents of the Sequential Function Chart SFC programming language are seldom used in the PLC sequence control. In order to overcome the defect that the Sequential Function Chart SFC needs to occupy a large storage space of the PLC, the present invention c...

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Abstract

The invention provides a sequential control method and system in a PLC. The method comprises the steps that an action restriction function block of a preset sequential function chart is obtained, wherein restriction functions of the action restriction function block comprises time restricting, time delaying, pulsing, effective setting, step effective reset, step ineffective setting and maintaining and maintaining of step ineffective delaying to be 1; preset textuality programming variables are obtained, wherein the preset textuality programming variables are used for storing and displaying execution steps of a program for replacing the step function in the sequential function chart in a text programming language; assigned values of the preset textuality programming variables are modified according to a preset conversion condition, and the action restriction function block is called to achieve the action function of the sequential function chart in the text programming language. In the whole process, the sequential control function is achieved by means of the text programming language, not only can the sequential control requirement be met, but also due to the fact that data of the text programming language is greatly simplified compared with that of the sequential function chart, the defect that the sequential function chart (SFC) needs to occupy a large storage space of the PLC can be overcome, and sequential, efficient and simple control over the PLC is achieved.

Description

technical field [0001] The invention relates to the technical field of software programming, in particular to a sequence control method and system in PLC. Background technique [0002] IEC (International Electrotechnical Commission, International Electrotechnical Commission) has formulated the PLC (Programmable Logic Controller, Programmable Logic Controller) international standard IEC1131. In this set of standards, IEC1131-3 specifies five PLC programming languages, including Text programming language ST and sequential function chart SFC, most of the PLC hardware currently supports these programming languages ​​in whole or in part. [0003] At present, with the expansion of the control scale and the increase of complexity, the difficulty of programming increases rapidly. At present, the sequential function chart programming language has been widely promoted and applied in PLC sequential control. The SFC programming language has strong program readability, and the action se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/05
CPCG05B19/056G05B2219/13004
Inventor 康明卫苗洪雷陆平杨威
Owner BEIJING GRANT MEMBRANE SEPARATION EQUIP
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