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TM
E50H2, E50H5 Installation Guide
By default, the Record_Count property of the Trend_Log objects is initialized to Zero.
Reading Data:
Access logged data with corresponding timestamps via the Log_Buffer property of the Trend_Log object using the BACnet ReadRange service. The E50H5 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_<n>
Where n is 1-3 (there are three instances of Trend_Log objects available)
Description
R
Trend_Log <n>
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 will Start (if Log_enable is TRUE). Set to a Date/Time earlier
than the Local_Date/Local_Time properites 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 will STOP (if still running).
Stop_Time will be 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 changes 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 & overwtrite 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 starts 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
BACnet Programming Information (cont.)
