According to manual "memory cell, word, octal, address". Example: Name = %M(X=bit, M = word, D = double word) # address => %MW10#5 = %MW#5 Modbus address 5 (check offset) ( Word address). %MX10#0 (binary address). Then link your application variable to "Path". Data type is assigned automatically. Note that with version 6.0.0 there might be issues with controller log and system freeze. If polled with unknown slave address, controller log is filled with error messages. Also if master is sending poll's faster than 500 ms during boot up, AC800 com3 freezes and there is is no communication (com3 needs restart with out message request faster than 500 ms).