ProSoft Technology MVI46-DNP - Manual (Page 64)

MVI46-DNP ♦ SLC Platform Reference
Master/Slave Communication Module
Page 64 of 143 ProSoft Technology, Inc.
August 23, 2007
The DNP database consists of data from the SLC and the IED units. The IED
database contains only data acquired from IED units. This data can be used in
the SLC's ladder logic, and is the only path to get IED data into the SLC. The
RBE flags and last value database are used for event generation. Events
received from the IED unit can be placed directly in the event buffer. This
requires that the RBE flag for the data points be set to a value of 1. For all points
in the RBE flags database with a value of zero, the module will generate the
events.
The following illustration shows the interaction of the counter points with the
databases.
The DNP database consists of data from the SLC and the IED units. The IED
database contains only data acquired from IED units. You can use this data in
the SLC's ladder logic. When the DNP slave port receives a counter freeze
command, the current counter values are passed to the frozen counter database.
If the DNP slave port receives a counter freeze with reset command, the current
counter values will be passed to the frozen counter database and only the values
in the DNP counter database will be set to 0.