ProSoft Technology MVI71-DNP - Manual (Page 108)

MVI71-DNP ♦ PLC Platform Reference
DNP 3.0 Master/Slave Communication Module
Page 108 of 172 ProSoft Technology, Inc.
August 23, 2007
The DNP master unit can read the current value data and the event data from the
module. Event messages generated by the module can be retrieved using a poll
for Class 3 data, as all analog input events are considered a Class 3 data type. If
unsolicited message generation is enabled in the application, the events are
automatically sent by the module to the DNP master unit when the maximum
event count for Class 3 data is reached or when the timeout for unsolicited
messages is exceeded. The following shows a data flow diagram for the analog
input data:
All data associated with the analog inputs is transferred from the PLC to the
module in BTW instruction and blocks 60 to 75. This provides for a maximum
number of 960 points.