ProSoft Technology MVI71-DNP - Manual (Page 107)

Reference MVI71-DNP ♦ PLC Platform
DNP 3.0 Master/Slave Communication Module
ProSoft Technology, Inc. Page 107 of 172
August 23, 2007
DNP Analog Input Data
This data type stores analog data with a data range of 0 to 65535 or –32768 to
32767. The size of this data area is determined from the configuration parameter
Number of Analog Input Points. The data area is partitioned into two separate
areas. The first is the DNP analog input data acquired from the PLC and the
second is the analog input data from IED units. The configuration parameter,
Number of Analog Input Points for PLC, determines the size of the PLC's data
area. The remaining portion is defined as the IED analog input data area.
PLC data are transferred to the module from the PLC using the COP command.
Therefore, these data are read-only for the module and the DNP master unit.
When the module receives new data from the PLC, it compares the new values
to those currently in the database. If there is a change in any of the data, the
module generates an event message for the points that change. The dead-band
parameter configured for the module determines the variance required to
generate an event message.
Data from IED units can also be placed in the DNP analog input data area.
Commands in the command list must specify the DNP database address (point
number) where the data will be placed.