The philosophy for modbus and profibus is same…the difference is
- modbus you can go up to 1200m only in the case of profibus you can go up to 2-5 km.
- In modbus the speed will be 125kbs where profibus it will be 1.5 mbs to 12mbs.
- In modbus you can connect maximum 32 devices for RS485 where in Profibus you can go upto 127devies without repeater.