I am new to this, I have CPM2A PLC connected to a MAD01, i would like to configure this in CX-One,
but during setting up of new project i cannot see I/O list so that i can configure the MAD01 module? TO the MAD01 I have connected a ultrasonic sensor which outputs voltage at different levels.

Please Help.

Hi and welcome to MrPLC.com!

The CPM series expansion units do not support configuration through CX-One or CX-Programmer and have to be configured by setting register values with logic instructions.

Have a look at section 3-1-1 of this manual:
CPM1/CPM1A/CPM2A/CPM2C/SRM1 (-V2) Programmable Controller Programming Manual
Hope this helps!