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Installation Guide
Power Monitoring
Data Logging
(E51H5A Only)
ZL0123-0D
Page 30 of 32
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The E51H5A includes a data logging feature that records three meter parameters, accessible via BACnet using Trend_Log objects.
All three Trend_Log objects utilize shared data logging resources in the meter, so all three are controlled in unison. All writable
properties other than Log_Device_Property_Object are common to all three Trend_Log obects. Changes to these properties
(Log_Enable, Start_Time, Stop_Time, Log_Interval, Stop_When_Full or Record Count) for any one of the objects will be reflected
in the corresponding property of all three objects. The Log_Interval property is also common with the Demand_Subinterval
(Present_Value of AV11), since logging records are updated synchronously with demand calculations.
Default settings cause logging to begin immediately, with 15 minute intervals and no stop time. When full, the buffer will wrap
and overwrite the oldest data first (unless the Stop_When_Full property is used).
Configuration
Use Log_Device_Object_Property to select the meter parameter to log with each object. Set this property to point to Present_
Value property of any of the Analog_Input objects. The default the values for the Log_Device_Object_Property of the three
Trend_Log objects are set as follows:
• TL1 = Real Energy Import (AI2 Present_Value)
• TL2 = Real Energy Export (AI3 Present_Value)
• TL3 = Total Real Power Present Demand (AI19 Present_Value)
The Log_Interval (& Demand Subinterval) can be set from 10 seconds to 32767 seconds (values of 1000 to 3276700). The
subinterval timer, which determines how often the meter's demand accumulators are updated, also triggers writing to the
Trend_Log log buffers. Use the Log_Interval property to set the data logging time subinterval, in units of hundredths of a second
(0.01 seconds). The default subinterval is 15 minutes (a value of 90000 in the Log_Interval property). The Buffer_Length is fixed at
5760, so at a 15 minute interval setting, the buffers hold 60 days of data.
Use the Stop_When_Full property to select either Single Shot (Stop_When_Full = TRUE) or Continuous mode (Stop_When_Full
= FALSE) for data logging. The default mode is Continuous. In Single Shot mode, the meter records data only until the buffer is
full. Data for this time period is kept, but newer energy information is lost. In Continuous mode, the meter continues to record
energy data as long as the meter is operating. The buffer can only hold 5760 entries at one time, however, so when the number of
records exceeds 5760, the oldest entry is deleted to make room for the newest.
To start data logging with any of the three Trend_Log objects, set the Log_Enable property to TRUE or set the Start_Time and
Stop_Time properties appropriately and wait for logging to commence at Start_Time.
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 E51H5A supports both the "by Position" and "by Sequence Number" modes of the ReadRange service, but
not the "by Time" mode.
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