ProSoft Technology 5201-DFNT-DNPM - Manual (Page 8)

DNPM ♦ ProLinx Gateway Functional Overview
DNP 3.0 Master Driver Manual
Page 8 of 56
ProSoft Technology, Inc.
September 30, 2009
1.1 Module Internal Database
The internal database is central to the functionality of the module. This database
is shared between all the ports on the module and is used as a conduit to pass
information from one device on one network to one or more devices on another
network. This permits data from devices on one communication port/network to
be viewed and controlled by devices on another port/network.
Other ProLinx
Protocol
Driver
DNPM
Driver
ProLinx
Communication
Gateways
Internal
Database
(Up to 4000 regs )
Other ProLinx
Protocol
Driver
Driver
ProLinx
Communication
Gateways
Internal
Database
regs )
1.2 DNP Master Database Layout
Central to the functionality of the DNP driver is the database. This database is
used as the interface between remote DNP devices and the other protocol
implemented on a module. The content and structure of the user data area of the
database is completely user defined. The following illustration shows the general
format of the module’s database:
DATA AREA DATA SIZE
BINARY INPUTS 1 WORD PER 16 POINTS
ANALOG INPUTS 1 WORD PER POINT
COUNTER DATA 2 WORDS PER POINT
BINARY OUTPUTS 1 WORD PER 16 POINTS
DNP DATA
ANALOG OUTPUTS 1 WORD PER POINT
The first word of the module’s database contains the first 16 points of binary input
data (if defined). It is important to understand how the data is mapped to the
database so that it can be accessed by the other protocol. Each DNP data type
has a fixed size. This size is used in conjunction with the number of points
configured for the type to determine the size and location in the database. The
following is an example of a user database with a defined set of point counts:
DATA AREA REGISTERS CFG VALUES
BINARY INPUTS 0 TO 1 2
ANALOG INPUTS 2 TO 51 50
COUNTER DATA 52 TO 71 10
BINARY OUTPUTS 72 TO 73 2
DNP DATA
ANALOG OUTPUTS 74 TO 113 40
USER DATA REMAINING DATA
AREA 114 TO 3999