Thanks for answer. I'm useing FW TRB1_R_00.07.03.4. I recognized, that MODBUS register 0 is in TRB142 1. This was not a problem. Problem was also with test of TRB142 with simulator of MODBUS RTU slave. When I put number not equal 0.0 (float), real example 123.456, the number was read 123.5. which was not, like I expected. From my point of view this is a bug of TRB142, but maybe I could make a mistake.
Thanks for any sugestion.