Hi,
starting to make some progress. Can you post a screen pic of the Modbus setup page.
I think that timeout your experiencing is when the Modbus plugin sends a message it expects an acknowledgement,
if it doesn't get one within the specified time it faults out.
If you change the comm protocol provided you reprogram P 9.02 to the appropriate setting so the drive knows how
Modbus intends signalling you should be fine. If you are of the opinion that the previuos setting of 8,1,o is better then
by all means change it. Read the manual to find the appropriate number for parameter 9.02.
Craig