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PLC hardware realization method for Petri net model of workshop manufacturing system

A technology for manufacturing systems and workshops, applied in instrumentation, design optimization/simulation, computing, etc., to resolve conflicts and other issues, and achieve the effects of resolving transition conflicts, resolving avalanche effects, and improving system security

Inactive Publication Date: 2017-08-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) Conflict issues
The conflict problem is a problem in the structure itself in the Petri net. When two or more transitions compete for the same place resources, conflicts may occur

Method used

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  • PLC hardware realization method for Petri net model of workshop manufacturing system
  • PLC hardware realization method for Petri net model of workshop manufacturing system
  • PLC hardware realization method for Petri net model of workshop manufacturing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] A method for converting Petri nets to PLC ladder diagrams in a workshop manufacturing system, comprising the following steps:

[0069] first step, figure 1 is a robot consisting of two robots (R 1 , R 2 : Each robot can hold one product at the same time) and three machines (M 1 , M 2 , M 3 : Each machine can process two products at the same time), and two input buffers (I 1 ,I 2 ) and two output buffers (O 1 ,O 2 ), an automated product production system composed together. The system is mainly divided into two production lines with two robots as the core, and its operation process is

[0070] J 1 : I 1 →R 1 → M 1 →R 2 → M 2 →O 1

[0071] or I 1 → M 3 →O 1

[0072] J 2 : I 2 → M 1 →R 2 → M 2 →O 2

[0073] Using Petri net pairs figure 1 The workshop manufacturing system shown is modeled, and the obtained Petri net model is as follows figure 2 shown. figure 2 The shown Petri net model is an example net commonly used in Petri net related res...

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Abstract

The invention discloses a method for converting a Petri net model to a PLC ladder diagram in a workshop manufacturing system. The method comprises the steps of firstly, performing modeling on the workshop manufacturing system by using a Petri net, and converting the Petri net model into a ladder diagram corresponding to a common PLC in an industrial control system; dividing the PLC ladder diagram of the Petri net model of the system into three modules including an initialization module, a detection module and an evolution module. The initialization module is used for transmitting an initial state M0 of the Petri net to the ladder diagram, namely, transmitting initial token information of the Petri net model to a corresponding coil or adder. The detection module is used for detecting enable information of each transition, judging priorities of conflict transitions, solving conflict problems and avoiding avalanche effects structurally. The evolution module is used for receiving the information transmitted by the detection module, transmitting enabled transitions and updating a token number of each library. According to the method, the workshop manufacturing system is taken as an object, and the conflict problems and the avalanche effects in the process of converting the Petri net of the system to the PLC ladder diagram are solved and eliminated.

Description

technical field [0001] The invention belongs to the field of workshop industrial manufacturing system and control technology, in particular to a PLC hardware realization method of a Petri net model of a workshop manufacturing system. Background technique [0002] The rapid development of science and technology has promoted the improvement of industrial manufacturing level, and at the same time, the automation level of workshop industrial manufacturing system has been continuously improved. The design and implementation process of the modern workshop manufacturing system is relatively complicated, so before the system is put into use, it is necessary to find a suitable workshop manufacturing system modeling method to clearly and accurately describe the various elements of the entire system. It is necessary to be able to effectively avoid some serious errors or defects at the beginning of the design, and to be able to monitor and improve the system conveniently when it is runn...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/22
Inventor 黄波丁高瞻张皓明蔡志成杨余旺
Owner NANJING UNIV OF SCI & TECH
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