Rockwell Automation 1758-RTU202 DataSite Software User Manual FRN 1.2 - Manual (Page 254)

Publication 1758-UM002D-EN-P - October 2010
254 DataSite DNP3 Configuration Utility (DS DNP3)
3. Enter the event buffer lengths in the Class1 Buffer Len, Class2 Buffer
Len, and Class3 Buffer Len boxes.
Each event buffer length for AI, DI, and PI specifies the maximum
number of events buffered by the DataSite controller. The valid values
for this parameter are 0…2000.
The String event buffer length is 0…10 events.
4. Enter the initial value of the object variable in the corresponding boxes.
See this table for the list of SDNP3 objects and their descriptions.
TIP
If the Unsolicited Response check box was selected,
the controller works in a self-reporting mode and
sends unsolicited information to the master station
automatically. In this mode of operation, the
connection between controller and master station is
very important. In a case where the connection has
failed, the events will be saved in the events buffer.
After the connection is restored, the saved events
will be sent to the master station. However, if many
events are accumulated in the buffer, more CPU
time is needed to process the saved events. If a new
event occurs during this period, there is a possibility
that the event will not be captured if it is present for
a very brief period of time.
SDNP3 object library
Object No. Variant No. Description
1 0 Binary input - all variants
1 1 Binary input
1 2 Binary input with states
2 0 Binary Input changes - all variants
2 1 Binary input changes without time
2 2 Binary input changes with time
2 3 Binary input changes with relative time
10 0 Binary output state - all variants
10 1 Binary output
10 2 Binary output state
12 1 Control relay output block
12 2 Pattern control block
12 3 Pattern mask
20 0 All variants
20 1 32-bit binary counter