If your production facility operates in a multiple shift environment, it may be desirable from an operational or maintenance viewpoint to configure your system so that each shift maintains its own schedule of operations. Since an Action Calendar area may only be associated with a single day type at any given time, you can define Pseudoareas within an Action Calendar.
A pseudoarea maintains its own event, day type, schedule, and day of the week definitions, while still merging the individual schedules at runtime into a single plant wide schedule for any given day.
Within a given area, each Pseudoarea will really represent the same set of devices, locations, points, etc., but will only schedule events against these points during the respective timeframe of each shift.
Example
Pseudoareas could be "Assembly_Shift1" and "Assembly_Shift2", each with their own respective schedules.