D.20
SEL-751A Relay Instruction Manual Date Code 20100129
DNP3 Communications
DNP3 Documentation
DNP3 Documentation
Device Profile
Table D.10 contains the standard DNP3 device profile information. Rather
than checkboxes in the example Device Profile in the DNP3 Subset
Definitions, only the relevant selections are shown.
In response to the delay measurement function code, the SEL-751A will
return a time delay accurate to within 50 milliseconds.
Table D.10 SEL-751A DNP3 Device Profile
Parameter Value
Vendor name Schweitzer Engineering Laboratories
Device name SEL-751A
Highest DNP request level Level 2
Highest DNP response level Level 2
Device function Slave
Notable objects, functions, and/or qualifiers supported Analog Dead-Band Objects (object 34)
Maximum data link frame size transmitted/received (octets) 292
Maximum data link retries Configurable, range 0–15
Requires data link layer confirmation Configurable by setting
Maximum application fragment size transmitted/received (octets) 2048
Maximum application layer retries None
Requires application layer confirmation When reporting Event Data
Data link confirm time-out Configurable
Complete application fragment time-out None
Application confirm time-out Configurable
Complete Application response time-out None
Executes control WRITE binary outputs Always
Executes control SELECT/OPERATE Always
Executes control DIRECT OPERATE Always
Executes control DIRECT OPERATE-NO ACK Always
Executes control count greater than 1 Never
Executes control Pulse On Always
Executes control Pulse Off Always
Executes control Latch Off Always
Executes control Latch On Always
Executes control Queue Never
Executes control Clear Queue Never
Reports binary input change events when no specific variation requested Only time-tagged
Reports time-tagged binary input change events when no specific variation
requested
Binary Input change with time
Sends unsolicited responses Configurable with unsolicited message enable
settings. Increases retry time (configurable) when a
maximum retry setting is exceeded.
Sends static data in unsolicited responses Never
Default counter object/variation Object 20, Variation 6
Counter roll-over 16 bits
Sends multifragment responses No
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