Schweitzer Engineering Laboratories SEL-2100, Instruction Manual

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Date Code 20010529 Distributed Network Protocol 3.00 C-1
SEL-2100 Instruction Manual
APPENDIX C: DISTRIBUTED NETWORK PROTOCOL 3.00
O
VERVIEW
The SEL-2100 Logic Processor supports Distributed Network Protocol (DNP) 3.00 Level 2 Slave
protocol. This includes access to the Relay Word, contact I/O, targets, Sequential Events
Recorder (SER), data settings groups, and time synchronization. The SEL-2100 supports DNP
point remapping.
C
ONFIGURATION
To configure a port for DNP, change 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
CLASSB Class for Binary Event Data (0–3) 2
CLASSC Class for Counter Event Data (0–3) 1
TIMERQ Minutes for Request Interval (0–3267) 0
STIMEO Seconds to Select/Operate Time-Out (0.0–30.0 seconds) 1.0
DRETRY Number of Data Link Retries (0–15) 3
DTIMEO Seconds to Data Link Timeout (0–5 seconds) 1
MINDLY Minimum Seconds from DCD to Tx (0.00–1.00 seconds) 0.05
MAXDLY Maximum Seconds from DCD to Tx (0.00–1.00 seconds) 0.10
PREDLY Settle Time from RTS ON to Tx (OFF, 0.00–30.00 seconds) 0.00
PSTDLY Settle Time from Tx to RTS OFF (0.00–30.00 seconds) 0.00
ETIMEO Seconds to Event Message Confirm Time-Out, (1–50 counts) 2
UNSOL Enable Unsolicited Reporting (Y, N) N
PUNSOL Enable Unsolicited Reporting at Power-Up (Y, N) N
REPADR DNP Address of Report to (0–65534) 0
NUMEVE Number of Events to Transmit On (1–200) 1.0
AGEEVE Seconds Until Oldest Event to Tx On (0.0–60.0 seconds) 2.0
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 CTS is
deasserted. When CTS 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-2100 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-2100 transmits a DNP message, it delays transmitting after asserting RTS by at
least the time in the PREDLY setting. After transmitting the last byte of the message, the
SEL-2100 delays for at least PSTDLY milliseconds before deasserting RTS. If the PSTDLY time
delay is in progress (RTS still high) following a transmission, and another transmission is
initiated, the SEL-2100 transmits the message without completing the PSTDLY delay and
without any preceding PREDLY delay.