Development of Equivalent Virtual Instruments to PLC Functions and Networks

Abstract

This research is a continuation to our work which was published in [1]. Eight different timing VIs are designed and tested. These include ON-Delay, OFF-Delay, Single Shot, Retriggerable Monostable, and Accumulative software-based timers. Using hardware programmable counter/timer chip (DAQ-STC-24bit) and PCI MIO-16E-1 DAQ board, another two precise timers are designed. At the end of the paper, for illustration purposes, an electro-pneumatic drive system was developed and controlled utilizing designed on-delay timers VI functions. Results of experiment show complete coincidence between the PLC-based control and Virtual PLC-based program results

An Integrated Application to Support the Implementation of Measurements and Data Analysis

“…Of course, it is possible to use typical structures such as loops and conditional statements, as well as dividing applications into subprograms (they are defined as separate virtual instruments). This allows the construction of applications with specific functionalities: numerical calculations [1,2], testing of products [1,3], testing of a virtual PLC [1,4].…”

A Methodology to Measure СP / CV Ratio Using U-shape Acoustic Resonance Tube

“…Other works [14][15][16][17] illustrate several techniques, based on acoustic measurement that are applicable to measure several physical and chemical parameters such as: density of gases, temperature, displacement and concentration. These methods are based on creating a standing wave within a resonance tube (forced or free resonance mode of operation) and then the physical phenomenon based on acoustic measurement is acquired by a microphone and signal processing is performed using LabVIEW software [16].…”

A Practical Applications of Virtual PLC using LabVIEW Software

“…The aim of the second part is to give the suitable current to solenoid (Suitablesignal conditioning). The output of the power transistor activates the solenoid valve (Alia et al, 2011).…”

“…Today, traditional PLCs are still in use at most plants, but windows-based PCs using the LabVIEW software (Abuzalata et al, 2010;Alia et al, 2011) are increasingly becoming the preferred control mechanism for new installations. PLCs have become a favorite tool in the control industry because of their simplicity, robust I/O interface and reliable performance Bolton (2006Bolton ( , 1999.…”