Chamberlain IPAC Administrator's Manual page 191

IPAC Server Administrator's Manual
WARNING: Activating Group Grace Periods
When you assign an activating group to a schedule, you are
prompted to specify a Grace Period. Without a grace period, the
schedule only becomes active if a group member arrives at or after
the schedule start time, not before. For example, if the schedule
starts at 9:00 and a member of the activating group arrives at 8:55,
the schedule will not become active at 9:00. With a grace period of
ten minutes, a member of the activating group could arrive any time
after 8:50 and the schedule would still become active at its 9:00
start time.
3. Assign the activating group access privileges at the desired door. By giving the
activating group access privileges at a specific door according to a specific
schedule you tell the system "This schedule does not allow access for any user
until it enters an active period and is first accessed by a member of the
activating group." See the instructions for Managing Groups in the following
section for instructions on managing group privileges.
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