ModbusMaster Mapper tool requires a license when more than one slave devices to be supported.
10-017-822
This is item number of installer file and supports 1 slave device with full read write capability.
10-017-923
This is item number for activating license. The tool then supports up to 5 Modbus/TCP slaves
Modbus Master Mapper Tool can be downloaded here:
https://wss.woodward.com/manuals/PGC/easYgen-3000XT_series/SW_Tools/ModbusMasterMapper
Modbus Master Application note