Note: This method is probably the most eloquent and user-friendly switching method, but will require additional programming and object creating on the HVAC system.
Figure 6 - Switchover Logic
This option adds logic to the controllers and binary points to regulate the commands coming from Events2HVAC. Additional binary points are created in the HVAC system for each item that Events2HVAC commands, and a global binary object is created to indicate the source of control you wish to have active, default schedules or Events2HVAC.
If the global switch point (SCHED-SW) indicates that you want to use the default schedules, all of the commands originating from default schedules are sent to the room points. If the global switch point indicates that you want Events2HVAC to control rooms, default schedules are blocked and the binary room points that you added for each control point will command the direct room points.
This kind of control takes more time because you have to add all of the binary points and the necessary programming logic. However, it will allow the Events2HVAC binary points to be tracked using point history and provide a more orderly switch over when it is needed.