This read-only display string reports the state of the third Auxiliary Event alarm input on the Ps1 controller, sourced from the AUX3 alarm point, one of several independently wired external contact inputs the controller supports. It gives the admin a channel for monitoring yet another site-specific external condition beyond the first two auxiliary inputs. For example, a site might wire this third auxiliary input to a water-leak detector so flooding in the equipment room triggers an alarm on this specific OID.