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
CN107092736AInactive Publication Date: 2017-08-25NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2017-08-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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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