The object engine input queue - Metasys - LIT-12011034 - General System Information - Metasys System - Release 11.0

MS/TP Communications Bus Technical Bulletin

Product name
Metasys System
Document type
Technical Bulletin
Document number
Release 11.0
Revision date

The Object Engine Input Queue handles all incoming messages intended for object level operations. The Object Engine processes these messages in order by priority, one at a time. If this queue is backing up, operation is slow and applications sending messages may encounter errors.

If the Object Engine Queue is overloaded, you may notice the following:

  • The BACnet® protocol messages (starting with the lowest priority) received by the queue are aborted (discarded if in the Alarm or Critical state). The Protocol Engine counter, Rcv Messages Discarded (under BACnet Protocol Eng, Diagnostic tab), counts and displays the number of discarded messages.
  • If the Object Engine Queue is critical, all messages sent to the queue (including internal messages) receive an error and BACnet protocol messages received from the IP port are discarded. Discarded Frames (under Eth IP Datalink, Diagnostic tab) counts and displays the number of discarded messages.