3–24
350 FEEDER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
DNP ETHERNET PROTOCOL SETTINGS
CHAPTER 3: ETHERNET INTERFACE
•
The DNP Time Sync IIN Period setting determines how often the Need Time Internal
Indication (IIN) bit is set by the 350 . Changing this time allows the 350 to indicate that
a time synchroniztion command is necessary more or less often
•
Various settings have been included to configure Default Variation for the Binary
Inputs, Counters and Analog Inputs Objects. The default variation refers to the
variation response when variation 0 is requested, and/or in class 0, 1, 2, or 3 scans
•
Up to 64 Binary Inputs and 32 Analog Input entries can be mapped to an item from a
list of 350 status events and metered values. Status events correspond to Funcion
Code 134B.
•
Each Analog Input point Deadband and Scale Factor can be set individually instead of
setting a general deadband or scale for different metering groups. This will avoid scale
and deadband conflicts for different meterings of the same nature.
•
Up to 16 Binary/Control Outputs can be configured by selecting a Virtual Input or
Command from a list of 32 Virtual Inputs and Commands (Force Coils). Some legacy
DNP implementations use a mapping of one DNP Binary Output to two physical or
virtual control points. In Order to configure Paired Control Points the source for states
ON and OFF should be set to different Virtual Inputs or Commands.
•
The DNP Technical Committee recommends using contiguous point numbers, starting
at 0, for each data type, because some DNP3 Master implementations allocate
contiguous memory from point 0 to the last number for each data type.
NOTE
NOTE:
Binary Inputs are inputs
to
the Master. Binary Outputs are outputs
from
the Master.
DNP general
Default variations for Object 1, 2 , 20 , 21 , 22 , 23 , 30 and Object 32 will be set by settings
and returned for the object in a response when no specific variation is specified in a Master
request.
Any change in the state of any binary point causes the generation of an event, and
consequently, if configured, an unsolicited response, or it is returned when the Master asks
for it. The same behaviour will be seen when an analog value changes by more than its
configured deadband limit. There can be up to 3 Masters in total, but only one Serial
Master.
The following Default Classes will be fixed for the different blocks of data:
Binary Input Points Default Class = 1
Analog Input Point Default Class = 2
Counters Default Class = 3
Each Data Point Class can be changed by protocol function code 22 in volatile mode. If a
restart is performed, the new values will be lost.
DNP Object 34 points can be used to change deadband values from the default for each
individual DNP Analog Input point. These new deadbands will be maintained such that in
the case of a relay restart, the values are not lost.
One Binary Counter has been hardcoded such that no option can be modified by setting:
•
Total_Number_of_Trips
Binary Output Point 15 ON
Select entry
from a list
Virtual Input 1 to 32 and Force
Coils
F86
Binary Output Point 15 OFF
Select entry
from a list
Virtual Input 1 to 32 and Force
Coils
F86
SETTINGS
PARAMETER RANGE
FORMAT
