Using pure Java OPC library allows you to run the client on any OS that supports Java. For this blog I will show you a sample client using OpenScada library.
You need the following tools and components to run this example:
IDE: IntelliJ IDEA Community Edition 2020.2
OPC Server: Matrikon Simulation Server
Libraries:
Java: Java JDK 1.8 or later
To create a sample client, do:
Open IntelliJ IDEA Community Edition
Do File | New | Project…
Select Maven, then set Project SDK, I am using Open JDK 11 on Ubuntu 20.04 (sudo apt install openjdk-11-jdk), then do Next
Set project details like testopc
See below for pom.xml, copy/paste and do Load Maven Changes or Ctrl+Shift+o
Navigate to Project | testopc | src | main | java, then do File | New | Java Class. Name the class client for example and copy client.java below.
Update client.java for the username and password
Then run it
Pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>testopc</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>6</source>
<target>6</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.openscada.utgard</groupId>
<artifactId>org.openscada.opc.dcom</artifactId>
<version>1.5.0</version>
</dependency>
<dependency>
<groupId>org.openscada.utgard</groupId>
<artifactId>org.openscada.opc.lib</artifactId>
<version>1.5.0</version>
</dependency>
<dependency>
<groupId>org.openscada.jinterop</groupId>
<artifactId>org.openscada.jinterop.core</artifactId>
<version>2.1.8</version>
</dependency>
<dependency>
<groupId>org.openscada.external</groupId>
<artifactId>org.openscada.external.jcifs</artifactId>
<version>1.2.25</version>
</dependency>
<dependency>
<groupId>org.openscada.jinterop</groupId>
<artifactId>org.openscada.jinterop.deps</artifactId>
<version>1.5.0</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.66</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.30</version>
</dependency>
</dependencies>
</project>
Client.java
import org.jinterop.dcom.common.JIException;
import org.jinterop.dcom.common.JISystem;
import org.openscada.opc.lib.common.ConnectionInformation;
import org.openscada.opc.lib.da.*;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.LogManager;
public class client {
public static void main(String[] args) throws Exception {
JISystem.setInBuiltLogHandler(false);
LogManager logManager = LogManager.getLogManager();
logManager.getLogger("org.jinterop").setLevel(Level.FINEST);
JISystem.setAutoRegisteration(true);
final ConnectionInformation ci = new ConnectionInformation();
ci.setHost("192.168.0.30");
ci.setDomain("");
ci.setUser("user1");
ci.setPassword("password1");
ci.setClsid("F8582CF2-88FB-11D0-B850-00C0F0104305"); //Matrikon
final String itemId = "Saw-toothed Waves.Int2"; //Matrikon
// create a new server
final Server server = new Server(ci, Executors.newSingleThreadScheduledExecutor());
try {
// connect to server
server.connect();
// add sync access, poll every 500 ms
final AccessBase access = new SyncAccess(server, 500);
access.addItem(itemId, new DataCallback() {
@Override
public void changed(Item item, ItemState state) {
System.out.println(state);
}
});
// start reading
access.bind();
// wait a little bit
Thread.sleep(10 * 1000);
// stop reading
access.unbind();
} catch (final JIException e) {
System.out.println(String.format("%08X: %s", e.getErrorCode(), server.getErrorMessage(e.getErrorCode())));
}
}
}
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