Modalità
Creating a Meter Trend Log
You use the meter trend log to record the value of a meter and seamlessly 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 .
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.
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 the value of the logged variable anytime the trigger variable changes state.
In the Log size box, select the number of records to be recorded before old ones 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 Meter constant box, enter the constant of the meter.
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.
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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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
In the Trend Chart box, click the Browse button
to either create a new trend chart or connect the trend log to an existing trend chart.action_zoom_plus_stroke
Click Create .
The meter trend log is created in the selected folder.
When a meter trend log is created, you need to add the current meter value.
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
Creating an Extended Trend Log
Creating a Trend Log List
Creating a Trend Chart that Monitors a Trend Log Series
Trend Log Wizard – Initial Meter Settings Page