A PLC programming environment based on a virtual plant

Park, Sang C.; Park, Chang Mok; Wang, Gi-Nam

doi:10.1007/s00170-007-1306-3

Cited by 30 publications

(16 citation statements)

References 11 publications

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“…To cope with the problem, it is necessary to have a more transparent PLC programming environment helping users to recognize hidden errors, which results in the concept of virtual commissioning [7]. Since real devices communicate with PLC programs through input/output symbols, the behavior of each virtual device should be the same as that of the real device.…”

Section: Logical Device Modelingmentioning

confidence: 99%

“…[7] A PLC program triggers the tasks of a virtual device through output symbols, and monitors the system status through input symbols.…”

Section: Logical Device Modelingmentioning

confidence: 99%

“…However, there are limitations due to the high level of abstraction of the simulation models [7]. As shown in Figure 1, real manufacturing systems are electrically controlled by low level control programs involving sensors and actuators [8,9], but conventional simulation models describe the dynamic behaviors of the manufacturing system with high level scripts.…”

Section: Introductionmentioning

confidence: 99%

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Survey on the virtual commissioning of manufacturing systems

Lee

Park

2014

Journal of Computational Design and Engineering

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137

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This paper reviews and identifies issues in the application of virtual commissioning technology for automated manufacturing systems. While the real commissioning of a manufacturing system involves a real plant system and a real controller, the virtual commissioning deals with a virtual plant model and a real controller. The expected benefits of virtual commissioning are the reduction of debugging and correction efforts during the subsequent real commissioning stage. However, it requires a virtual plant model and hence still requires significant amount time and efforts. Two main issues are identified, the physical model construction of a virtual device, and the logical model construction of a virtual device. This paper reviews the current literature related to the two issues and proposes future research directions to achieve the full utilization of virtual commissioning technology.

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Section: Logical Device Modelingmentioning

confidence: 99%

“…[7] A PLC program triggers the tasks of a virtual device through output symbols, and monitors the system status through input symbols.…”

Section: Logical Device Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Survey on the virtual commissioning of manufacturing systems

Lee

Park

2014

Journal of Computational Design and Engineering

Self Cite

137

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“…When the signal of panel start arrival, the several groups measuring data which the 3 rd and the 5 th sensor collected should be taken out , then the averaging data after finishing the moving average filter twice for the middle half of each group measurement data are respectively 5 U and 6 U , the calibration value of the 3 rd and the 5 th sensor are respectively 3 J S and 5 J S , the tolerance measuring value(displacement value) obtained from processing the measurement data which the 3 rd and the 5 th sensor collected are respectively 5 S and 6 S ,then, …”

Section: Ipcmentioning

confidence: 99%

Automatic Measurement Of Shape Parameters For Hydraulic Torque Converter

Zhang

Bai

2016

International Journal on Smart Sensing and Intelligent Systems

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Abstract-In this paper, the automatic measurement method of the Hydraulic Torque Converter shape parameters is studied. Aiming at the defects of the traditional manual measurement method, the solution for measuring the shape parameters of Hydraulic Torque Converter with the automatic measurement system is proposed on the basis of in-depth analysis for the Hydraulic Torque Converter shape parameters' characteristics. Automatic measurement system mainly contains two parts, the Hardware Measurement System and the Software Measurement System. The working principle of the automatic measurement system are as follows: firstly, as system starting, the arm upper Measuring Fixture put the Hydraulic Torque Converter work piece into the Measuring Fixture, and then the Measuring Fixture make the Pump Hub Axle and Cover Hub Axle of the measured work piece fixed; secondly, the measured work piece start to rotate, at the same times, s the work piece is measured by MARPOSS displacement sensor. The measuring stop as soon as the measured work piece completes rotating 360 degrees. Lastly, measurement data is collects by the Software Measurement System based on LabVIEW development platform using NI acquisition card. The Moving Average Filter and Butterworth approximation method is mainly used during processing the measurement data. The tolerance measuring value of each shape parameter can be obtained, after the measurement data processed. The external dimensions of the measured work piece have been qualified by the data obtained. Under practical test, this method fit the industrial production demand very well; it can help to improve the production efficiency greatly used in the industrial production.

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“…These formalisms can help the design process of control logics, however, it is compared to LL which makes it difficult to find hidden errors, which are the most difficult part of the verification of a control program. To cope with the problem, one needs a more transparent PLC programming environment that helps the users to recognize hidden errors (Park et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Petri Nets and Ladder Logic for Fully-Automating and Programmable Logic Control of Semi-Automatic Machines and Systems

Barghash¹,

Abuzeid²,

Al‐Rabadi³

et al. 2011

American Journal of Engineering and Applied Sciences

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Problem statement: Automating semi-automatic dynamic machines and complex systems, where some functionalities are already automated but the machine doesn't run fully in automatic mode, represents another challenge to automating dynamic and manual complex systems. This study deals with a special case of this general problem, where the system's semi-automatic and automatic functionalities run separately in a sequence with either automatic and/or semi-automatic functionality running at any point of time, but not both. Approach: Petri-nets can successfully represent the operations of both the semi-automated and fully-automated functionalities of such dynamic systems. Three roles for the programmable logic controllers were suggested: (a) Ignoring the presence of the semi-automatic part, (b) simulating the semi-automatic part and recognizing discrepancies and(c) simulating the semi-automatic functionalities and supporting it, where the last choice was most costly and most reliable. Results: This study presents a case study for a PVC mixing dynamic process to illustrate the three suggested controller design possibilities, where a Petri net model and related ladder logic program were developed to show these three controller design options. In this respect, the semiautomatic functionality is an intermediate step between the two automated functionalities, within which an important decision should be made to end the previous automatic step and to begin the next automatic step. Conclusion/Recommendations: The automation method that was introduced in this study is applicable to a large number of machines within industrial and mechanical systems that were built using older semi-automatic control systems. Various decision analyses {DA1, DA2, DA3} were shown to produce basic choices for such types of applications. Petri-nets and ladder logic in this respect can successfully represent the operations of both the semi-automated and fully-automated functionalities, where a Petri net model and the consequent ladder logic program, used to program the utilized programmable logic controller, are developed to show three possible controller designs, where the choice between three designs depend on the designers objective of cost, reliability and fault tolerance.

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A PLC programming environment based on a virtual plant

Cited by 30 publications

References 11 publications

Survey on the virtual commissioning of manufacturing systems

Survey on the virtual commissioning of manufacturing systems

Automatic Measurement Of Shape Parameters For Hydraulic Torque Converter

Petri Nets and Ladder Logic for Fully-Automating and Programmable Logic Control of Semi-Automatic Machines and Systems

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