This read-only display string reports the state of the fifth Auxiliary Event alarm input on the Ps1 controller, sourced from the AUX5 alarm point, the last of the controller's standard auxiliary contact inputs described in this batch. It rounds out the set of general-purpose external alarm channels an admin can wire to site-specific conditions not otherwise covered by the controller's built-in alarms. For example, a site might wire this fifth auxiliary input to a generator-running signal so the controller flags whenever backup generator power is active.