Siemens SITRANS P320, Руководство по эксплуатации, Страница: 152 / 260

Enable monitoring
Once the monitored variable is configured, you must ensure that the limit monitoring is set to
Enabled and then select Apply and transfer to the device. To monitor a different process value,
repeat the steps in a new tab page for limit monitoring.
Displaying and resetting event counters
If process alarms or warnings are triggered during device operation, return to this dialog and
select Reset and acknowledge. The event counter is reset and process alarms and warnings
are acknowledged and deleted.
9.3.7.2 Trend log
Requirement
You have the SITRANS P420 product version.
Set trend log
Trend logging can be configured in SIMATIC PDM via the menu command "Device > Trend
log settings".
1. Activate logging by specifying a number of values to be logged in the "Number of logging
values" parameter.
2. In the "Number of logged points" parameter, enter the number of points to be logged.
3. In the "Logging interval" parameter, specify the interval in seconds between the log entries.
4. Use the "Logging behavior" parameter to define the buffer behavior when the log is full.
5. In the parameters "Logging value 1" and "Logging value 2", define the process values to
be logged.
6. Click on the "Transfer" button to write the log settings to the device.
You can view the trend log via the menu command "Diagnostics > Trend log".
Show trend log
The PV and SV (set in the "PV selector" and "SV selector" parameters) are recorded at
specified intervals and the trend log displays up to 300 data points since the last power-on.
The number of points already recorded and the start time are displayed.
Click on the "Read" button to update the log. A dialog box is displayed in which you can specify
the number of points to be read, the point density and the start time for reading. (An example
for setting the point density: If the point density is set to 2, every second value is displayed.)
When you have made all the settings, click on the "Transfer" button.
To display the trend lines, select the menu command "View > Process values" in the "Trend"
tab.
Parameter assignment
9.3 Parameter assignment over remote operation
SITRANS P320/P420 (mA/HART)
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Operating Instructions, 06/2018, A5E44852162-AA