AD Op Master PDC Last Bind Monitor. This monitor generates an alert when the response time for a bind to the domain controller holding the Primary Domain Controller (PDC) Emulator operations master role exceeds a specified period of time.
This means that the operations master has been responding in a less than optimal time for an extended period (by default, about 1.5 hours for the PDC Emulator).
The PDC Emulator might be overloaded.
Review other alerts generated from the PDC Emulator to determine whether it is overloaded.