Chapter 4 PAS Application Software Configuring Communication Protocols
96 Series PM172 Powermeters
If the scaling unit is greater than 1, the counter value is reported being
divided by the selected scaling unit from 10 to 1000. To get the actual value,
multiply the counter reading by the scaling unit.
Configuring DNP Class 0
The most common method of getting static object information from the meter
via DNP is to issue a read Class 0 request.
The PM172 allows you to configure the Class 0 response by assigning
ranges of points to be polled via Class 0 requests.
To view or change the factory-set DNP Class 0 assignments, select Protocol
Setup from the Meter Setup menu and click on the DNP Class 0 Points tab.
The factory-set Class 0 point ranges are shown in the picture below. To
change the factory settings and build your own Class 0 response message:
1. Select the object and variation type for a point range.
2. Specify the start point index and the number of points in
the range. Refer to the PM172 DNP3 Reference Guide for
available data points.
3. Repeat these steps for all point ranges you want to be
included into the Class 0 response.
4. Click Send to download your setup to the meter.
Configuring DNP Event Classes
The PM172 can generate object change events for any static analog input,
binary input and binary counter point when a corresponding point either
exceeds a predefined threshold, or the point status changes. A total of 64
change event points are available for monitoring.
Object change events are normally polled via DNP Class 1, Class 2 or Class
3 requests. You can link any change event point to any event class upon the
event priority. Refer to the PM172 DNP3 Reference Guide for more
information on polling event classes via DNP.
A change event point index is normally the same as for the corresponding
static object point. If you wish to use independent numeration for event
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