Delta-V Controller & System Limits

Hi,

as we have S series controller limits defined with Max number of I/O cards, DSTs etc. I am wondering if there is a limit defined for max number of PID loops a controller can handle? I know this will depend on a few factors like the speed  etc. but are there any hard limits or any limits defined base don best practices? (lets say on 500ms)?

any other related to this topic will help.

Thanks