scholarly journals Study Agent Function Code

2020 ◽  
Author(s):  
Keyword(s):  
Function Code

scholarly journals Development of a Data Acquisition and Monitoring System Based on MODBUS RTU Communication Protocol

2020 ◽  
Vol 5 (6) ◽  
pp. 433-440
Author(s):  
H.M.K.K.M.B. Herath ◽  
S.V.A.S.H. Ariyathunge ◽  
H.D.N.S. Priyankara
Keyword(s):  
Data Acquisition ◽  
Communication Protocol ◽  
Harmonic Distortion ◽  
Computer Application ◽  
Test Results ◽  
Time Data ◽  
Measuring Device ◽  
Soft Starter ◽  
Function Code ◽  
Data Acquisition Process

MODBUS is a serial communication protocol use in industry, which developed by Modicon in 1979. The most common usage of the MODBUS communication protocol is the Programmable Logic Controllers (PLC). The aim of this study is to develop a system for acquiring and analyze measured values from the power measuring device and display them on C# developed GUI. The main objective is to develop an algorithm for MODBUS RTU communication protocol for data acquisition process. In this study, a single power measuring device was used with the aid of MODBUS RTU and RS-485 communication protocols, and data shown in the device was visualized on the C# developed GUI application and analyze them according to the user’s requirement. Data acquisitions from the holding registers were made by using the MODBUS Function Code three. The test results were observed and verified accuracy by performing several trials. Data was collected from the power measuring device which was attached to the industrial soft starter panel of a milling machine. Voltage, Current, Total Harmonic Distortion and Power Factor for each phase were retrieved to the C# devolved computer application and verify results with the real-time data of the power measuring device.

Comparative Frequency Domain Seakeeping Analysis of a Fast Monohull in Regular Head Waves

2002 ◽  
Author(s):  
Thomas E. Schellin ◽  
Christian Beiersdorf ◽  
Xiao-Bo Chen ◽  
Adolfo Maron
Keyword(s):  
Green Function ◽  
Frequency Domain ◽  
Three Dimensional ◽  
Forward Speed ◽  
Software Module ◽  
Mathematical Basis ◽  
Numerical Predictions ◽  
Head Waves ◽  
Seakeeping Analysis ◽  
Function Code

Two sets of seakeeping computations and comparative model teats were performed for a fast monohull in regular waves. The first set of computations used an existing three-dimensional frequency domain panel code that formulates the potential flow problem by means of the zero-speed Green function. The second set used a modified version of this code that implemented an advanced software module, newly developed within the European research project WAVELOADS, where the free-surface forward-speed Green function method based on the Fourier-Kochin formulation accounts for forward speed effects. Although this formulation provided a solid mathematical basis for obtaining robust and accurate numerical predictions, numerical inaccuracies prevented obtaining satisfactory results. For nearly all cases investigated, predictions from the original (zero-speed Green function) code correlated more favorably with test data than those from the modified (forward-speed Green function) code. For the fast monohull investigated here, practically relevant global load predictions based on the zero-speed Green function correlated favorably with measurements.

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