Hi Prashant,
In VC mode the limit is 64 APs. Since the VC mode supports heterogenous APs, you can set AP410i as a VC and manage your AP410i/310i with it but not the other way around. Here is a little VC Adoption matrix for your better understanding:
If you happen to have a WiNG controller (not VC) in a single site/campus type environment, then the no. of APs on that site would be equal to the adoption capacity of the controller.
If its a WiNG controller in distributed site environment, each site can have 256 APs. The limit of 256 is only valid for newer APs i.e. 11ax and certain high-tier 11ac wave-2 APs such as AP8533/8432. For the 11ac wave-1 and older APs the limit is 128 APs per remote site.
Regards,
Ovais