Logix5000 Controllers General Instructions - SLAC Confluence

38 Digital Alarm Instruction (ALMD)Output Parameter Data Type DescriptionDeliveryDN BOOL Indicates alarm notification message delivery success.Set – delivery success – at least one subscriber was subscribed and all subscribers receivedthe latest alarm change state message successfully.Cleared – delivery not completed successfully or in progress.DeliveryEN BOOL Indicates alarm notification message delivery in process.Set – delivery in progress.Cleared – delivery not in progress.NoSubscriber BOOL Indicates that the alarm had no subscribers when attempting to deliver the most recent statechange message.Set – no subscribers.Cleared – At least one subscriber.NoConnection BOOL Indicates that all of the alarm’s subscribers were disconnected when attempting to deliverthe most recent state change message:Set – all subscribers disconnected.Cleared – at least one subscriber connected.CommError BOOL Indicates that there was a communication error when delivering last alarm message to atleast one subscriber:Set – communication errors – all retries exhausted.Cleared – all connected subscribers successfully received alarm messageIf this error is indicated then it means that a subscriber was subscribed, and it had aconnection opened, but the message was not delivered successfully.AlarmBuffered BOOL Indicates that the alarm message was buffered when not delivered to subscriber(s), eitherdue to a CommError or a lost Connection:Set – alarm message buffered for at least one subscriber.Cleared – alarm message is not buffered.Subscribers DINT Indicates number of subscribers for this alarm.SubscNotified DINT Indicates number of subscribers successfully notified about the most recent alarm statechange.Status DINT Indicates the bit-mapped status of the instruction execution.Publication 1756-RM003I-EN-P - January 2007