Securely Connect WinCC 8.0 to a S7-1200 or S7-1500 with firmware v4.0 or higher using OMS+

This manual describes the steps to take to setup communication between S7

Install SCADA Export Tool 

The scada export tool allows you to export connection data (certificate and – if wanted – tags). Install this tool before proceeding to the next part of the manual.

https://support.industry.siemens.com/cs/document/109748955/simatic-scada-export-for-tia-portal?dti=0&lc=en-DE

Download the appropriate version for your Tia Portal installation and install the tool. 

Configure the PLC

Creating a new PLC project without secure communication

Create a new project from the Project menu in Tia Portal
Name the project and klick create

Creating a new PLC project with secure communication

 Changing the settings of an existing PLC.

 Changing settings to use password for HMI access

Changing settings to use secure connections

Export PLC connection data for WinCC 

Exporting Certificate only.

Exporting Certificate and tags.

Create Connection in WinCC and install certificate

Configure Connection

Configure Install certificate

Configure Tags from Export file

https://support.industry.siemens.com/forum/nl/en/posts/how-to-import-tag-from-s7-1500-to-wincc/318617