@francoisd You can do it by hand or use .csv to import Modbus device definition - https://kb.mervis.info/doku.php/en:mervis-ide:30-communication-protocols:30-modbus?s[]=modbus&s[]=csv
I've created the device definition for you, so you can simply import it by right clicink on the modbus TCP channel and select Import device definition.
The .csv file should contain:
StationNumber,Name,Element,Count,Function,Writable,StType,ByteOrder,K,Q,X1,Y1,X2,Y2
1,PWM_prescale,1018,1,HoldingRegister,1,Int,12,,,,,,
1,PWM_cycle,1019,1,HoldingRegister,1,Int,12,,,,,,