Dnp General - GE 350 Communications Manual

CHAPTER 3: ETHERNET INTERFACE
NOTE:

DNP general

SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
• 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 3 Series relay status events and metered values. Status events correspond to
format FC134B.
• 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.
Binary Inputs are inputs to the Master. Binary Outputs are outputs from the Master.
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. Alternatively it is returned when the
Master asks for it. The same behavior 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.
For the 350 and 339 relays, one Binary Counter has been hardcoded such that no option
can be modified by setting:
• Total_Number_of_Trips
Requests for Object 20 (Binary Counters), Object 21 (Frozen Counters), and Object 22
(Counter Change Events) must be accepted.
Function codes "Immediate Freeze", "Freeze and Clear" etc. are accepted as well.
The FAULT REPORT MAPPING IN DNP/104 setpoint may be set to a value of "Disabled" or
"Enabled". When "Disabled", only the configurable Analog Input points are available
beginning at point index 0.When "Enabled", the Fault Report Values are assigned from
point 0 to 32 in the 339 and 350 relays, and from 0 to 38 in the 345 relay, with the
configurable Analog Inputs following the point numbers.
DNP ETHERNET PROTOCOL SETTINGS
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