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Especially for the S7-1200/S7-1500 controllers, there are incompabilities due to the authentication mechanisms of these controllers.
As the PLCSIM versions are using different keys, not all client software versions are able to establish a connection to PLCSIM. As NetToPLCSim acts as a bridge to the underlying S7ONLINE interface, this is not something that can be fixed inside NetToPLCSim.

This does not concern the Put/Get communication with absolute addresses.

The following table gives some combinations which were tested with NetToPLCSim V1.2.4:

Client-Software	TIA Version	Result
WinCC 7.2		Info: WinCC 7.2 only supports "not optimized" datablocks
WinCC 7.2 (7.2.0.11)	TIA V15.1 Plcsim (Upd3)
WinCC 7.2 (7.2.0.15)	TIA V15.1 Plcsim (Upd3)
WinCC 7.2 (7.2.0.11)	TIA V14 Plcsim (SP1+Upd7)
WinCC 7.2 (7.2.0.11)	TIA V13 Plcsim (SP1+Upd6)
WinCC 7.3
WinCC 7.3 (7.3.0.0)	TIA V15.1 Plcsim (Upd3)
WinCC 7.3 (7.3.0.0)	TIA V14 Plcsim (SP1+Upd7)
WinCC 7.3 (7.3.0.0)	TIA V13 Plcsim (SP1+Upd6)
WinCC 7.4
WinCC 7.4 (7.4.1.13)	TIA V15.1 Plcsim (Upd3)
WinCC 7.4 (7.4.1.13)	TIA V15 Plcsim (Upd4)
WinCC 7.4 (7.4.1.13)	TIA V14 Plcsim (SP1+Upd7)
WinCC 7.4 (7.4.1.13)	TIA V13 Plcsim (SP1+Upd6)
Simatic.Net V12.0 OPC Server		Info: Comes with WinCC 7.3
Simatic.Net V12.0 SP2 OPC	TIA V14 Plcsim (SP1+Upd1)
Simatic.Net V12.0 SP2 OPC	TIA V13 Plcsim (SP1+Upd4)
Simatic.Net V14.0 OPC Server		Info: Comes with WinCC 7.4
Simatic.Net V14.0 OPC	TIA V14 Plcsim (SP1+Upd1)
Simatic.Net V14.0 OPC	TIA V13 Plcsim (SP1+Upd4)
Simatic.Net V15.0 OPC Server		Info: Comes with WinCC 7.5 (SP2)
Simatic.Net V15.0 OPC	TIA V16 Plcsim (Upd6)
Simatic.Net V18.0 OPC Server
Simatic.Net V18.0 OPC	TIA V16 Plcsim (Upd6)