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Creating a Meter Trend Log and Associated Objects
You use the meter trend log to record the value of a meter and handle consumption calculations independent of meter rollover and meter exchange.
The meter trend log is a variable triggered trend log with extra functionality to seamlessly handle consumption calculations independent of meter rollover or meter exchange.
Per maggior informazioni, consulta Variable Triggered Trend Logs .
You create and configure meter trend logs using WorkStation.
For example, in the figure below, the meter trend log records a meter the 1st of every month. In the middle of February the meter rolls over to 00000. A chart with meter consumption calculation prints the consumption every month.
When physically replacing an old meter with a new one, you have to configure the meter trend log by adding the settings of the old meter and new meter in the Manage replacement of meter dialog box in WorkStation. These settings are the foundation to handle a meter rollover or calculating consumption though meter replacement. Per maggior informazioni, consulta Manage Replacement of Meter Dialog Box .
In order for a meter rollover to be managed correctly in the meter trend log and to ensure logging starts at the correct energy reading value, you enter previous meter and new meter information in the Manage replacement of meter dialog box. Per maggior informazioni, consulta Managing Replacement of a Meter .
In WorkStation, in the System Tree pane, select the folder or SmartStruxure server where you want to create the trend log.
On the File menu, point to New and then click Trend .
In the object type list, select Meter Trend Log .
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In the Name box, type a name for the trend log.
In the Description box, type a description for the trend log.
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Click Next .
In the Logged variable box, enter the variable that you want to log.
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Click the Set unit button
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Select a unit for the trend log values.
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In the Prefix box, select the prefix of the unit.
Click Select .
In the Delta box, enter the minimum value change that triggers a new record.
In the Trigger variable box, enter the variable that triggers the log.
In the Trigger condition box, select when to record the value of the logged variable:
Select Change to true to record the value of the logged variable when the trigger variable changes to true.
Select Change to false to record the value of the logged variable when the trigger variable changes to false.
Select All changes to record the value of the logged variable anytime the trigger variable changes state.
In the Log size box, enter the number of records to be recorded before old records are overwritten.
In the Available trend storage box, check that the available number of records is not exceeded.
In the Clear when enabled box, select True to clear the trend log every time the trend log is enabled.
Click Next .
In the Start time box, enter the time when the meter is installed.
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In the Start value box, enter the value of the meter when it was installed.
In the Min value box, enter the first value of the meter when it rolls over.
In the Max value box, enter the last value of the meter before it rolls over.
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Click Next .
In the Extended Trend Log box, click the Browse button
to create an extended trend log and connect it to the trend log.action_zoom_plus_stroke 
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Click Create .
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In the Name box, type a name for the extended trend log.
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In the Location box, enter the path where to store the extended trend log.
In the Description box, type a description for the extended trend log.
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Click Next .
In the Monitored trend log box, make sure that the meter log is entered.
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In the Smart log box, select if you want to use smart log:
Select True to enable Building Operation software to automatically optimize the transfer rate of records from the monitored trend log to the extended trend log.
Select False to manually specify the percentage threshold at which the trend log transfers its records to the extended trend log, and then select the percentage in the Threshold box.
In the Maximum transfer interval box, select the maximum length of time that can pass between transfers.
In the Transfer trigger variable box, enter a trigger variable to force a transfer of all records from the trend log to the extended trend log, for example, to generate a complete report. Per maggior informazioni, consulta Extended Trend Logs .
In the Log size box, enter the number of records to be stored before old records are overwritten.
In the Available trend storage box, check that the available number of records is not exceeded.
In the Include in reports box, select True to make the extended trend log available to WebReports, for example, to include the extended trend log in a trend log comparison report.
Click Create .
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In the Trend Log List box, click the browse button
to create a trend log list and connect it to the trend log.action_zoom_plus_stroke
Click Create .
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In the Name box, type a name for the trend log list.
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In the Location box, enter the path where to store the trend log list.
In the Description box, type a description for the trend log list.
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Click Next .
In the Display trend log box, confirm that the meter log is automatically entered.
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In the Log space (records) box, enter the maximum number of records to display in the trend log.
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Click Create .
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In the Trend Chart box, click the Browse button
to create a new trend chart and connect it to the existing trend log.action_zoom_plus_stroke
Click Create .
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In the Name box, type a name for the trend chart.
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In the Location box, enter the path where to store the trend chart.
In the Description box, type a description for the trend chart.
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Click Next .
In the Time mode box, select the time mode for the trend chart:
Select Absolute (start and end time) and then enter a start time in the Start time box and an end time in the End time box to manually specify the x-axis start point and end point. Per maggior informazioni, consulta Trend Chart Axes .
Select Relative (to current time) and then type the time span in the Time span box to automatically adapt the x-axis of the chart to display the current time as the rightmost value. Per maggior informazioni, consulta Trend Chart Axes .
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In the Auto scale left Y-axis box, select True to automatically adapt the y-axis scale to the trend log series.
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Under Series , click the Add button
to display additional trend data in the trend chart.action_zoom_plus_stroke 
In the object type list, select Trend Log Series or Real Time Trend Series .
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In the Name box, type a name for the series.
In the Description box, type a description for the series.
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Click Next .
In the Display variable box, enter the variable you want to display in the trend chart.
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In the Weight box, enter the line weight of the series.
In the Show markers box, select True to display a marker for each recorded value.
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Click Create .
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Click Create .
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Click Create .
The meter trend log is now connected to an extended trend log, a trend log list, and a trend chart.
Meter Trend Logs
Managing Replacement of a Meter
Trend Units
Log Record Storage
Create Object Wizard – Naming the Object Page
Create Trend Log Wizard – Configure Meter Trend Log Page
Extended Trend Logs
Create Trend Log Wizard – Configure Extended Trend Log Page
Trend Log Lists
Create Trend Log Wizard – Configure Trend Log List Page
Trend Charts
Create Trend Log Wizard – Configure Trend Chart Page
Trend Chart Axes
Create Trend Log Wizard – Configure Trend Log Series Page
Trend Log Wizard – Initial Meter Settings Page