ProSoft Technology MVI71-DNP - Manual (Page 101)

Reference MVI71-DNP ♦ PLC Platform
DNP 3.0 Master/Slave Communication Module
ProSoft Technology, Inc. Page 101 of 172
August 23, 2007
These blocks are mapped into a predefined memory area in the module. Pointers
into the memory area are computed by the application for each data type when
the module is initialized. The application will only copy the portion of the block
that contains valid data. The following illustration shows the relationship of the
module data area and the BTR/BTW data.
It is important to understand the relationship of the BTR/BTW identifications and
the data in the module. Confident data handling in the module is only
accomplished if the user defines a consistent set of parameters in the module
configuration, handles the BTR/BTW operations for the blocks in the module in
the PLC ladder logic and understands the requirements of the DNP master unit.
Review the BTR/BTW section of this documentation for further understanding of
this process and the ladder logic section on how to implement the operation.
The file data type uses a set of block identification numbers between 100 and
120. The number selected is user defined in the file configuration data table with
each file assigned a unique block identification number. The structure of the BTR
block is also different from that of the other data types.