EVENT function also has an input BLOCK to block the generation of events.
The events that are sent from the IED can originate from both internal logical signals
and binary input channels. The internal signals are time-tagged in the main processing
module, while the binary input channels are time-tagged directly on the input module.
The time-tagging of the events that are originated from internal logical signals have a
resolution corresponding to the execution cyclicity of EVENT function. The time-
tagging of the events that are originated from binary input signals have a resolution of
1 ms.
The outputs from EVENT function are formed by the reading of status, events and
alarms by the station level on every single input. The user-defined name for each input
is intended to be used by the station level.
All events according to the event mask are stored in a buffer, which contains up to
1000 events. If new events appear before the oldest event in the buffer is read, the
oldest event is overwritten and an overflow alarm appears.
The events are produced according to the set-event masks. The event masks are treated
commonly for both the LON and SPA communication. The
EventMask
can be set
individually for each input channel. These settings are available:
•
NoEvents
•
OnSet
•
OnReset
•
OnChange
•
AutoDetect
It is possible to define which part of EVENT function generates the events. This can be
performed individually for the
SPAChannelMask
and
LONChannelMask
respectively.
For each communication type these settings are available:
•
Disabled
•
Channel 1-8
•
Channel 9-16
•
Channel 1-16
For LON communication the events normally are sent to station level at change. It is
possibly also to set a time for cyclic sending of the events individually for each input
channel.
To protect the SA system from signals with a high change rate that can easily saturate
the event system or the communication subsystems behind it, a quota limiter is
implemented. If an input creates events at a rate that completely consume the granted
quota then further events from the channel will be blocked. This block will be removed
Section 15
1MRK505222-UUS C
Monitoring
932
Technical reference manual
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