thanks both for your help,
yes Chi, I totaly agree cause Siemens OPC server uses XDBs to resolve symbols names
and to answer you Kevin, I totally agree with you on namespace index (1) and NodeId format string.
I think the problem I encounter is with the "Simple OPC UA client " from Siemens in which i donāt see how to formalise this namespace index.
when I use Siemensās OPCUA the correct string is āS7:ā, yet I canāt find the corresponding one for the ignition server
(yes , the name given here - LiaisonOPCUA_S300) is the one of the S7 connection bewteen the PLC and the OPCUA server and should not be used in the [S300]address string )
Iām about to going back to Prosys Sample Client ā¦ and try to find the correct method to send my āns=1, NodeIdā reference string
keep in touch then
Eric