ProSoft Technology MVI71-DNP - Manual (Page 80)

MVI71-DNP ♦ PLC Platform Reference
DNP 3.0 Master/Slave Communication Module
Page 80 of 172 ProSoft Technology, Inc.
August 23, 2007
The following illustration shows the data transfer method used to move data
between the PLC processor, the MVI71-DNP module, and the DNP network.
As shown in the diagram above, all data transferred between the module and the
processor over the backplane is through the BTR and BTW blocks. Ladder logic
must be written in the PLC processor to interface the block data with user data
files. All data used by the module is stored in its internal databases. These
databases are defined as virtual DNP data tables with addresses from 0 to the
maximum number of points for each data type. The following illustration shows
the layout of the databases:
DATA AREA BLOCKS
DNP DATA BINARY INPUTS PLC DATA 0 to 15
IED DATA
BINARY OUTPUTS PLC DATA 20 to 35
IED DATA
COUNTER DATA PLC DATA 40 to 55
IED DATA
ANALOG INPUTS PLC DATA 60 to 75
IED DATA
ANALOG OUTPUTS PLC DATA 80 to 95
IED DATA
FLOAT INPUTS PLC DATA 1100 to 1107