Additionally, in the S7-1500 the PUT / GET access must be enabled in the communication settings. You can see how this works here (snapshot from TIA Portal):
2. Configure the LOGO! PLC in such way that connections from an HMI device are accepted. To do so, go to “Tools- > Ethernet Connections” and then add a new connection.
3. Double-click on the newly created connection to access the properties.
Select:
You can access DB1, inputs, outputs, flags, counters and timers with an IP-S7-LINK. Now via “Tools- > VM parameter map” set the variables that are to be transferred to the DB1.
Pictures from Siemens Support Portal