Dear all,

For a project, I would like my OPC UA server interface to use the IdentifierType String by default instead of Numeric. Currently, when adding variables, the NodeIDs are sometimes modified, which I would like to prevent.

I have considered using the Standard SIMATIC server, but this exposes a large portion of the PLC by default. This means I would have to manually disable OPC UA access for each data block. Additionally, as far as I know, I cannot define read/write access per node. For other programmers, if they are not careful and change the name of a variable in a data block that is OPC UA accessible, the communication with an external system will no longer work. That is why I prefer not to use the standard SIMATIC server but rather a dedicated server interface.

Therefore, I would really like the OPC UA server interface to use the IdentifierType String by default, ensuring that new nodes are assigned based on their string name. I have found a document (attached) that provides some guidance, but it does not fully meet my requirements. Currently, I have to change the IdentifierType for each node individually, whereas I would prefer to modify the default setting of the serverinterface so that all future nodes are automatically assigned as String.

Does anyone know if this is possible in the Siemens S7-1500 OPC UA server interface, and if so, how to configure it? If it is truly not possible, I would also like to know, so I don’t continue searching for this solution and instead opt for another, less ideal alternative.

Hi!

I would say the only way to change it is by using SiOME, as explained in the PDF you attached. I've always done it with Siome; it can't be configured from TIA Portal...

(https://support.industry.siemens.com/cs/ww/en/view/109793221)

Hi Pau97,

Thank you for your answer. Just to clarify, do you always have to export your server interface to SiOME and then import it back into TIA Portal after adding your variables to get the identifier strings?

That’s possible to do, and maybe your approach is indeed the correct way, as I haven’t come across another method. If anyone in the future finds a way to configure the server interface with a string identifier by default, I’d love to hear about it.