Remote Field Bus status and statistics attributes - 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

With the local field bus, the status and statistics values are obtained directly from the MS/TP communication software, which has direct access to the MS/TP communication frames. However, with the Remote Field Bus, the status and statistics values must be obtained from one of the remote Metasys Family BACnet controllers communicating through the BACnet Router. When at least one Metasys MS/TP equipment controller is mapped to the Remote Field Bus as a Metasys Family BACnet device, the system can retrieve and display the status and statistics values from the Remote Field Bus. Be aware that if this equipment controller goes offline and a different Metasys equipment controller is selected to provide remote bus statistics, the values obtained may abruptly change because the values are from a different controller. This is normal operation.

The following Metasys attributes are located under the Diagnostics tab of a Remote Field Bus.

Logging object reference

This attribute indicates the remote Metasys MS/TP equipment controller configured for obtaining MS/TP trunk status and statistics values. The device name appears if available; otherwise, the MAC address on the MS/TP trunk appears. The value is empty for a local field bus, or if no Metasys equipment controller is available or known. The remote Metasys device is chosen by first looking for an online, mapped Metasys BACnet device. If none is found, then the Analyze Field Bus command results (if any) are scanned for a possible Metasys family device.

Bus health index and Bus performance index

Trunk health and performance moving average calculations are generally delayed one update time (usually one minute) on a Remote Field Bus due to the delays in reading raw statistics values remotely. As mentioned previously, the numbers reported experience a transient glitch if you change the Metasys BACnet device used to gather statistics.

Port status

The value of this attribute is Remote Trunk for a Remote Field Bus. For an online local field bus, the value of this attribute is Active.