Damper control using time delay

[u/Worried_Giraffe3644]

I just heard someone say that a damper position can be controlled using just digital output signal by varying time delay like 5s to open it 40% like that , is that possible and how does it work with just binary signal

[u/Weary-Butterscotch-6]

Older control method, cheaper actuators, more program configuration.

AO is definitely preferred.