Veris Industries E50H5A Install - Manual (Page 27)

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Installation Guide
Power Monitoring
E50H2A, E50H5A
TM
BACnet Programming Information (cont.)
Reading Data:
Access logged data with corresponding timestamps via the Log_Buffer property of the Trend_Log object using the BACnet ReadRange service. The E50H5A supports both the
“by Position” and “by Sequence Number” modes of the ReadRange service, but not the “by Time” mode.
Trend_Log Objects
Trend_Log Properties
Used
R/W Units Additional information
Object_Name R Trend_Log_ Where n is 1-3 (there are three instances of Trend_Log objects available)
Description R Trend_Log Where n is 1-3 (there are three instances of Trend_Log objects available)
Log_Enable W Binary Set this to TRUE to enable logging or FALSE to disable logging. The default is TRUE.
The value is set to FALSE internally if logging stops for other reasons (i.e. buffer is full).
Start_Time W Date/Time Sets the Date/Time when data logging starts (if Log_enable is TRUE). Set to a Date/Time earlier
than the Local_Date/Local_Time properties of the Device object and Set Log_Enable TRUE to start
logging immediately.
Stop_Time W Date/Time Sets the Date/Time when data Logging stops (if still running).
Stop_Time is ignored if ”wildcard” values are used in any of the fields.
Log_Device_Object_
Property
W BACnetDeviceObjectProptertyReference Set (point) this to the Present_Value of any of objects AI1 through AI49
to establish which parameter to log. Default values are:
TL1 = Real Energy Consumption (Array of AI1 Present_Value)
TL2 = Reactive Energy Consumption (Array of AI27 Present_Value)
TL3 = Total Real Power Present Demand (Array of AI34 Present_Value)
Log_Interval W 0.01 seconds Logging period in hundredths of a second.
Default is 90000 (15 minute intervals); minimum value is 1000 (10 seconds). This property can also
be set to Zero, which will change all three Trend_Logs and the Demand calculation to a manual
mode (sometimes referred to as “Sync to Comms”. In manual mode, the demand interval is updated
and another record is logged upon a manual command, which is issued by writing the value 21211
to the Present_Value of object AV1.
Stop_When_Full W Binary Set this to TRUE to stop logging when the buffer is full (single-shot mode) or FALSE to continue when
full (wrap & overwrite oldest data entries).
Buffer_Size R 5760 Length of Log Data buffer (# of records).
Log_Buffer R List of BACnetLongRecord Contains the data values logged, with timestamps
Record_Count W Unsigned 32-bit integer This is an integer count of how many records logged since the Trend_Log objects were last reset.
Writing a Zero to this property resets the logs of all three objects. This value defaults to Zero, but, by
default, logging starta automatically at 15 minute intervals.
Total_Record_Count R Unsigned 32-bit integer This is an integer count of how many records logged since the Trend_Log objects were created (the
factory state of the meter). This count is unaffected by resetting the Record Count or by power
failures.
Event_State R Binary