ProSoft Technology MVI71-DNP - Manual (Page 103)

Reference MVI71-DNP ♦ PLC Platform
DNP 3.0 Master/Slave Communication Module
ProSoft Technology, Inc. Page 103 of 172
August 23, 2007
The remote DNP master unit can read the current status data and the event data
from the module. Event messages generated by the module can be retrieved
using a poll for Class 2 data, as all digital input events are considered a Class 2
data type. If unsolicited message generation is enabled in the application, the
module automatically sends the events to the DNP master unit when the
maximum event count for Class 2 data is reached, or when the timeout for
unsolicited messages is exceeded. The following shows a data flow diagram for
the digital input data:
All data associated with the digital inputs is transferred from the PLC to the
module using the BTW instruction and blocks 0 to 15. This provides for a
maximum number of 15360 points.