Date Code 20001006 Distributed Network Protocol (DNP) V3.00 H-1
SEL-351 Instruction Manual
APPENDIX H: DISTRIBUTED NETWORK PROTOCOL (DNP)
V3.00
OVERVIEW
Some versions of the SEL-351 family of relays support Distributed Network Protocol (DNP)
V3.00 L2 Slave protocol. This includes access to metering data, protection elements (Relay
Word), contact I/O, targets, sequential events recorder, breaker monitor, relay summary event
reports, settings groups, and time synchronization. The SEL-351 supports DNP point re-mapping.
CONFIGURATION
To configure a port for DNP, set the port PROTO setting to DNP. Although DNP may be selected
on any of the available ports, DNP may not be enabled on more than one port at a time. The
following information is required to configure a port for DNP operation:
Label Description Default
SPEED Baud rate (300 - 38400) 2400
DNPADR DNP Address (0 - 65534) 0
ECLASS Class for event data (0 - 3) 2
TIMERQ Time-set request interval (0 - 32767 min.) 0
DECPLA Currents scaling (0 - 3 decimal places) 1
DECPLV Voltages scaling (0 - 3 decimal places) 1
DECPLM Miscellaneous data scaling (0 - 3 decimal places) 1
STIMEO Select/operate time-out (0 - 30 sec.) 1.0
DRETRY Data link retries (0 - 15) 3
DTIMEO Data link time-out (0 - 5 sec.) 1
MINDLY Minimum time from DCD to Tx (0 - 1 sec.) 0.05
MAXDLY Maximum time from DCD to Tx (0 - 1 sec.) 0.10
PREDLY Settle time from RTS on to Tx (OFF,0 - 30 sec.) 0
PSTDLY Settle time after Tx to RTS off (0 - 30 sec.) 0
ANADB Analog reporting deadband (0 - 32767 counts) 100
UNSOL Enable Unsolicited reporting (Y,N) N
PUNSOL Enable Unsolicited reporting at power-up (Y,N) N
REPADR DNP Address to report to (0 - 65534) 0
NUMEVE Number of events to transmit on (1 - 200) 10
AGEEVE Age of oldest event to transmit on (0 - 60 sec.) 2.0
UTIMEO Unsolicited confirmation timeout (0 - 50 sec.) 2
The RTS signal may be used to control an external transceiver. The CTS signal is used as a DCD
input, indicating when the medium is in use. Transmissions are only initiated if DCD is de-
asserted. When DCD drops, the next pending outgoing message may be sent once an idle time is
satisfied. This idle time is randomly selected between the minimum and maximum allowed idle
times (i.e., MAXDLY and MINDLY). In addition, the SEL-351 monitors received data and treats
receipt of data as a DCD indication. This allows RTS to be looped back to CTS in cases where
the external transceiver does not support DCD. When the SEL-351 transmits a DNP message, it
Courtesy of NationalSwitchgear.com
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