Historically, SAP typically connects to our server instance via the OPC DA interface. If their installation of SAP does not have OPC client capabilities (which could write the tag values down into the S7-300 device directly), then we would not necessarily have any guidance on how to connect the two. That may be more of a question for SAP directly.
If SAP is leveraging SNMP, then using our SNMP Agent plugin to expose the tag values to SAP should work, but we would not have any information on how to configure it on the SAP side.
Principal Technical Support Engineer | Kepware Technologies