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Code Block | ||||||||
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package org.openscada.opc.tutorial;
import java.util.concurrent.Executors;
import org.jinterop.dcom.common.JIException;
import org.openscada.opc.lib.common.ConnectionInformation;
import org.openscada.opc.lib.da.AccessBase;
import org.openscada.opc.lib.da.DataCallback;
import org.openscada.opc.lib.da.Item;
import org.openscada.opc.lib.da.ItemState;
import org.openscada.opc.lib.da.Server;
import org.openscada.opc.lib.da.SyncAccess;
public class UtgardTutorial1 {
public static void main(String[] args) throws Exception {
// create connection information
final ConnectionInformation ci = new ConnectionInformation();
ci.setHost("your host");
ci.setDomain("");
ci.setUser("your user");
ci.setPassword("your password");
ci.setProgId("SWToolbox.TOPServer.V5");
// ci.setClsid("680DFBF7-C92D-484D-84BE-06DC3DECCD68"); // if ProgId is not working, try it using the Clsid instead
final String itemId = "_System._Time_Second";
// 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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The examples also have some code which shows how to browse the OPC tree.
Writing values
...For this we need to configure a tag in TOPServer which is actually writable
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Until then have a look at this great post: http://clifcarr.blogspot.de/2011/02/readwrite-to-opc-serverplc-register.html