ProSoft Technology MVI46-DNP - Manual (Page 74)

MVI46-DNP ♦ SLC Platform Reference
Master/Slave Communication Module
Page 74 of 143 ProSoft Technology, Inc.
August 23, 2007
DNP Analog Output Data
This data type stores analog values sent from the DNP master unit to the module
and SLC 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 SLC and the second is the DNP analog
output data for the IED units. The configuration parameter, Number of Analog
Output Points for SLC, determines the size of the SLC'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.
SLC data are transferred from the module to the SLC using the COP command
operation. Therefore, these data are read-only for the SLC, as the SLC 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
SLC in M1: file elements 640 to 767. This provides for a maximum number of 128
points.