ProSoft Technology MVI71-DNP - Manual (Page 109)

Reference MVI71-DNP ♦ PLC Platform
DNP 3.0 Master/Slave Communication Module
ProSoft Technology, Inc. Page 109 of 172
August 23, 2007
DNP Analog Output Data
This data type stores analog values sent from the DNP master unit to the module
and PLC 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
Output Points. The area is partitioned into two separate areas. The first area is
the DNP analog output data for the PLC and the second is the DNP analog
output data for the IED units. The configuration parameter, Number of Analog
Output Points for PLC, determines the size of the PLC's data area. The
remaining portion is defined as the IED analog output data area. IED units can
use any portion of the DNP analog output data area. The command list
instructions are not limited to the IED data area.
PLC data are transferred from the module to the PLC using the COP command
operation. Therefore, these data are read-only for the PLC, as the PLC cannot
directly alter these values in the module. It is the responsibility of the DNP master
unit to maintain this data. For example, if the DNP master sends a value of 3405
to the module for a specific point, the value will be stored in the module until
changed by the master. The following shows a data flow diagram for the analog
output data:
All data associated with the analog outputs is transferred from the module to the
PLC using BTR instruction and blocks 80 to 95. This provides for a maximum
number of 960 points.