Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

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H.18
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Distributed Network Protocol
Data Map
The Status field is used exactly as defined. All other fields are ignored. A
pulse operation asserts a point for a single processing interval. Caution should
be exercised with multiple remote bit pulses in a single message (i.e., point
count > 1), since this may result in some of the pulse commands being ignored
and returning an already active status.
Analog Outputs (objects 40 and 41) are supported as defined by the preceding
table. Flags returned with object 40 responses are always set to 0. The Control
Status field of object 41 requests is ignored. If the value written to index 0 is
outside of the range 1 through 6, the relay will not accept the value and will
return a hardware error status.
Relay Summary Event
Data
Single-Event or Multiple-Events event summary data will be supported. The
relay will default to Single-Event mode. The relay will change to Multiple-
Events mode if the binary output 23 control point is used.
For Single-Event Mode, any new trip event (TRIPA, TRIPB, TRIPC, or
TRIP3P) is latched into the event registers. The event registers will be locked
(they won’t update) for time EVELOCK.
After EVELOCK elapses, only
subsequent trip events will be reported . The event registers will be cleared by
an assertion of the TRGTR Relay Word bit.
In standard mode (DNP) the Relay Multiple-Event Summary data is available
on a first in, first out (FIFO) basis. In extended mode (DNPE), the Relay
Multiple-Event Summary data can be read in two ways: first in, first out
(FIFO); or last in, first out (LIFO).
To use the FIFO method, the master should monitor binary input point 1023,
which will be on when there is an unread relay event summary. To read the
oldest relay event summary, the master should Pulse-On binary output
point 23. This will load the relay event summary analogs (points 105–113,
123–126) with information from the oldest relay event summary, discarding
the values from the previous load. After reading the analogs, the master should
again check binary input point 1023, which will be on if there is another
unread relay event summary. The master should continue this process until
binary input point 1023 is off. If the master attempts to load values using
output point 23 when binary input point 1023 is off, the relay event type
analog (point 105) will be loaded with zero. With the FIFO method the relay
event summaries will always be collected in chronological order.
In extended mode (DNPE) only , the LIFO method is available. To use the
LIFO method the master should monitor binary input point 1023, which will
be set when there is an unread relay event summary. To read the newest relay
event summary, the master should Pulse-Off binary output point 23. This will
load the relay event summary analogs (points 105–113,123–126) with
information from the newest relay event summary, discarding the values from
the previous load. After reading the analogs, the master should again check
binary input point 1023, which will still be on if there is another unread relay
28 Pulse RB10 Pulse RB9 Pulse RB10 Pulse RB9 Pulse RB10 Pulse RB9
29 Pulse RB12 Pulse RB11 Pulse RB12 Pulse RB11 Pulse RB12 Pulse RB11
30 Pulse RB14 Pulse RB13 Pulse RB14 Pulse RB13 Pulse RB14 Pulse RB13
31 Pulse RB16 Pulse RB15 Pulse RB16 Pulse RB15 Pulse RB16 Pulse RB15
32 Pulse CC Pulse OC Pulse CC Pulse OC Pulse CC Pulse OC
a
This function is only available in multi-event extended mode (DNPE). It functions as “Do Nothing” in standard mode (DNP).
Table H.9 Control Field (Sheet 2 of 2)
Index Close (0x4X) Trip (0x8X) Latch On (3) Latch Off (4) Pulse On (1) Pulse Off (2)