actually i want to select ddc system for thermal power plants having capacity of 330 MW the total I/O counts shall be 7000 nos. and the system will be connected to other system PLCs thru 42 nos. MODBUS . i have choice of GEXinhua 400E/Siemens Teleperm xp add T2000/ABB symphony Harmony. can u give some experience on either of these systems .
I would like to suggest that you should visit Suratgarh Thermal Power Station and take a look at the Symphony Melody system by ABB installed in Unit #5 and working satisfactorily.