usingopcinvisualstudio - telemark university...
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1 Hans-‐Pe*er Halvorsen, Telemark University College, 2013.02.19
Using OPC in Visual Studio Example: Logging Temperature Data using OPC
Equipment • Hardware: – NI USB-‐TC01 Thermocouple Measurement Device (or NI USB-‐6008 DAQ Device)
• SoKware: – MatrikonOPC SimulaFon Server – Visual Studio 2010 – DAQmx Driver – Measurement Studio 2012 for Visual Studio 2010
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What is OPC?
What is OPC?
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• OPC -‐ “Open Process Control” • A standard that defines the communicaFon of data between devices from different manufactures • Require an OPC server that communicates with the OPC clients • OPC allows “plug-‐and-‐play”, gives benefits as reduces installaFon Fme and the opportunity to choose products from different manufactures • Different standards: Real-‐Fme data (OPC DA), Historical data (OPC HDA), Alarm & Event data (OPC AE), etc.
What is OPC?
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The user are free to choose the best suited devices, controller and applicaFon for their project without worrying about which vendor each came from.
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What is OPC?
E.g. a PLC
OPC is the world’s most popular standards-‐based data-‐connecFvity method. It is used to answer one of the automaFon industry’s biggest challenges: how to communicate between devices, controllers, and applicaFons without ge^ng caught up in the usual custom driver-‐based connecFvity problems.
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NI USB TC-‐01 Thermocouple
Device
GeVng Started with the NI USB-‐TC01 Thermocouple device
Once the device has been successfully detected, the NI USB-‐TC01 Launch Screen will open (as shown in Figure below), or a Windows “Autoplay” dialog will appear allowing you to select “TC01Launcher.exe” to run the sobware.
TC01Launcher.exe
Note! If “Autoplay” does not start or it is disabled, locate the NI USB-‐TC01 under “My Computer” and double-‐click “TC01Launcher.exe” to manually run the sobware.
The NI USB-‐TC01 has a green LED next to the USB cable to indicate the device status. When the LED is illuminated, the device is powered and ready for operaFon. If the LED is not illuminated, the device is not powered or did not iniFalize.
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NI USB-‐TC01 Thermocouple Measurement Device – Temperature Logger
Run the Temperature Logger to check if the device works as expected before you start on your LabVIEW Programming 9
Open the Log File to see the data
How-‐To use the NI USB TC-‐01 Thermocouple Device in LabVIEW
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The USB-‐TC01 Device works similar as the USB-‐6008 DAQ device, i.e., you use the DAQ Assistant in LabVIEW
NI USB-‐TC01 Thermocouple Measurement Device using LabVIEW
The USB-‐TC01 Device works similar as the USB-‐6008 DAQ device, i.e., you use the DAQ Assistant
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DAQ Assistant for NI USB-‐TC01
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Acquire Signals » Analog Input » Temperature » Thermocouple
Select Physical Channel ai0
Use default ProperFes
Click OK to Finish
Temperature Simulaaon
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Since we don’t have a TC01 device per student, or if you want to further develop your program at home (without TC01 ), you can create a simple “Temperature Simulator”
A simple SubVI that simulates a Temperature value using a Random Generator
In this way you can easily switch between the real Temperature sensor (TC01) and the Simulator
Case Structure
Case Structure
While Loop
While Loop
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OPC
Matrikon OPC Simulaaon Server
Visual Studio with Measurement Studio
OPC Server
OPC Client
OPC DA
Matrikon OPC Explorer
COM/DCOM
We will use the Matrikon OPC SimulaFon Server – which is a free of charge OPC Server for test purposes.
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Note! Normally, the OPC Server and the Clients are not on the same computer, but in this assignment we will for simplicity have everything on the same computer.
OPC Client
OPC Client
COM/DCOM COM/DCOM
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Visual Studio + Measurement Studio Select “New Project” in Visual Studio:
Make sure to select the DataSocket Library
Select the “NI Windows Applicaaon” Template
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Measurement Studio is an “Add-‐in” for Visual Studio created by NaFonal Instruments.
Visual Studio + Measurement Studio Example:
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Read from OPC Server using Visual Studio
string opcUrl; double opcValue; opcUrl = "opc://localhost/Matrikon.OPC.SimulaFon/Bucket Brigade.Real4"; DataSocket dataSocket = new DataSocket(); if (dataSocket.IsConnected)
dataSocket.Disconnect(); dataSocket.Connect(opcUrl, AccessMode.Read); dataSocket.Update(); opcValue = Convert.ToDouble(dataSocket.Data.Value);
Make sure you have Measurement Studio Installed!!
Note! This Code Snippet reads only one value once, you can use e.g. a Timer in order to read values at specific intervals.
Example:
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Timer
public Form1() { IniFalizeComponent(); amer1.Start(); }
private void amer1_Tick(object sender, EventArgs e) { … //Read from OPC … //Scaling … //Plot Data }
Timer Event:
Iniaalizaaon:
Properaes:
Structure your Code properly!! Define Classes and Methods which you can use here (see example on next page)
In Visual Studio you may want to use a Timer instead of a While Loop in order to read values at specific intervals.
You may specify the Timer Interval in the ProperFes Window
Select the “Timer” component in the Toolbox
Double-‐click on the Timer object in order to create the Event
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OOP: Classes, Fields and Methods
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class Car //Class {
public string color; //Field //Method public void ShowCarColor() { MessageBox.Show("My Car is: " + color); }
} Car myCar = new Car(); //We create an Instance of the Class
myCar.color = "blue"; //We set a value for the color Field myCar.ShowCarColor(); //We call the Method
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Example:
OOP: Object Oriented Programming
Addiaonal Resources
• NI USB-‐TC01 Thermocouple Measurement Device
• Data AcquisiFon in LabVIEW • OPC and Real-‐Time Systems in LabVIEW • IntroducFon to Visual Studio and C# • Data AcquisiFon in C#
22 h*p://home.hit.no/~hansha/ The resources are located here:
Hans-‐Pe*er Halvorsen, M.Sc. Telemark University College Faculty of Technology Department of Electrical Engineering, Informaaon Technology and Cyberneacs
E-‐mail: [email protected] Blog: h*p://home.hit.no/~hansha/
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