All the alarms in Vista come to alarm receiver which are not wanted. For example, the system alarms are not wanted to be received by Alarm Receiver.
The possible cause is that the alarm control is not defined in Menta or Workstation.
For Menta alarm blocks that do not have an alarm control object assigned to them or Menta alarm blocks that references a non-existing alarm control object in TAC Vista, the alarms are sent to the default alarm control object, $Alr_Cntrl.
Define the specific alarm control in Menta or Workstation. Then only specific alarms will come to alarm receiver. Refer to the Chapter 18 of the TAC Vista Technical Manual.