Modbus addresses for writing coils for abc7028

i want to know what are the address i should put in my micro14000 ab plc when writing to coils, for my register i am putting 1025 and it works, but is not working for coils.

There are 2 different addressing modes in the Anybus Communicator:


It sounds like you are using Anybus Address Mode, so you would use the map on page 27 of the User Manual (Bit addresses 16385 - 20480):