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You might want to take a look at the EnergyPlus documentation for the Controller:OutdoorAir object. Many of the digital controls have to do with the economizer control type, economizer control action type, lockout type fields as well as the other fields. There is a lot of flexibility with that object. If you do want to schedule the outdoor air, there are three fields related to scheduling. See

http://bigladdersoftware.com/epx/docs/8-4/input-output-reference/group-controllers.html#controlleroutdoorair

or

http://nrel.github.io/EnergyPlus/InputOutputReference/01d-InputOutputReference/#controlleroutdoorair