Trend Logs

CBMS supports BACnet trend Logs in the following products.

• AAC-1000 - BACnet Router and Gateway.​
• AAC-WIN -Windows Software Bundle.

Note that BACnet Trendlogs require a corresponding BACnet Object as a value to be monitored. For example a Modbus point could be extended with a BACnet Analog Input object and then referenced by the Trendlog object.

BACnet Trendlogs require the clock to be configured to use the correct Time Zone, on all products except Windows. To configure the time zone navigate to app-service-date to display the DateService. From this screen, change the timezone to suit your location and check to ensure that the correct time is set.

Navigate to app-drivers-bacnet-local and verify that the IP port is enabled and running. Navigate to app-drivers-bacnet-local and verify that the BACnet Device settings are correct, the DeviceId must be changed from the default value of 9999 to a unique number.

Select "Add Points" from this page if the settings look correct.

From the ObjectType list, change the type to Trendlog and change the starting instance and quantity to the desired values. There must be an available BACnet Object of type AI,AO,AV,BI,BO or BV inside the device which will be referenced by the Trendlog Obect.

Click the add button to populate the list of trendlogs to be added to the device. Once you have finished adding trendlogs to the list, click the next button and the logs will be saved to the device.

Navigate to app-drivers-local-points-trendlog-trendlog 1 where you can view the trendlog.
The data will update when new samples are take which is set by the log interval property of the BACnet trendlog.
The toolbar has buttons to display the data in a table or download to a CSV file.

To change the BACnet Properties for the trendlog, click on the "BACnet Object" tab which will bring up a list of properties associated with the trendlog. From this screen the buffer size, log interval, etc can all be changed.