Hi,
you need to add a function to your Modbus connection.
Configure/Plugins/Modbus.....with your connection highlighted, probably Modbus0 unless you have a whole swag of them! There is a row of four
icons at the top of the window...Make New Connection, Delete Connection, Add a Function, Delete a function. The Add a function icon should be active
with the others greyed out. The function setup panel allows you to write to and read from coils, registers and blocks of registers. Enjoy...
Craig