Siemens Simatic S7-1500 - Page 98

Software section
3.3 Configure visualization
S7-1500
98 Getting Started, 05/2014, A5E03981761-AC
3. Repeat this procedure for all entries highlighted in red.
Result
An HMI connection had already been created for tags already configured in the CPU and
HMI device.
You have restored this HMI connection.