Under "Access" we define access specific employee settings.
Employees for whom the Master mode activates will always have access everywhere, regardless of the definitions of their access profiles and possible anti-pass back conditions.
Only when this employee is no longer active, or if his badge validity is expired he will have no access. Also when a reader is blocked you can not even get access on it with Master mode.
This mode should therefore be applied with great caution, and should always be set off in normal circumstances. One can use the master mode to quickly give an overall access to someone (for example in case of an emergency).
Here you can set which door(s) this employee can unlock for a longer time. This is used in combination with doors by which the mode "unlock(/lock) on booking in case active (check group)" is enabled.