hi,

i am testing to connect with java to a beckhoff plc over the beckhoff opc ua/da server.

i connected to the server and i created one node. now i want to read the value. but i got errors:
error1:
com.prosysopc.ua.StatusException: (0x80000000) “” StatusCode= (0x80000000) “”
at com.prosysopc.ua.client.UaClient.a(Unknown Source)
at com.prosysopc.ua.client.UAClient.readAttribute(Unknown Source)
at com.prosysopc.ua.client.UAClient.readValue(Unknown Source)
at ClassName.main(ClassName.java:88)

error2:
com.prosysopc.ua.StatusException: Bad_DeviceFailure (0x808B0000) “There has been a failure in the device/data source that generates the value that has affected the value.”
at com.prosysopc.ua.client.UaClient.a(Unknown Source)
at com.prosysopc.ua.client.UAClient.readAttribute(Unknown Source)
at ClassName.main(ClassName.java:88)

My Code:

…
UaClient client;
String serverUri = “opc.tcp://localhost:4840”;
try
{
NodeId node = new NodeId(4, “GVL_Write.testBool”);

client = new UaClient(serverUri);
client.setSecurityMode(SecurityMode.NONE);
client.connect();

DataValue valueBrowseName = client.readAttribute(node, Attributes.BrowseName); // works
DataValue valueDataType = client.readAttribute(node, Attributes.DataType); // works
DataValue value1 = client.readValue(node); // error2
DataValue value2 = client.readAttribute(node, Attributes.Value); // error1

…

can anyone help me?

thx!