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288
Event function (EV)
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When using a Substation Automation system, events can be spontaneously sent or
polled from the terminal to the station level. These events are created from any available
signal in the terminal that is connected to the event function block. The event function
block can also handle double indication, that is normally used to indicate positions of
high-voltage apparatuses. With this event function block, data also can be sent to other
terminals over the interbay bus.
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The events can be created 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 each I/O module. The events are produced
according to the set event masks. The event masks are treated commonly for both the
LON and SPA channels. 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 outputs from the event function block are formed by the reading of status and
events by the station HMI on either every single input or double input. The user-defined
name for each input is intended to be used by the station HMI.
Twelve of the event function blocks are executed with fast cyclicity. That means that
the time-tagging resolution on the events that are emerging from internal logical sig-
nals, created from configurable logic, is the same as the cyclicity of this logic. The time
tagging resolution on the events that are emerging from binary input signals have a res-
olution of 1 ms.
Two special signals for event registration purposes are available in the terminal, 7HUPL
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As basic, 12 event function blocks EV01-EV12 running with a fast cyclicity, are avail-
able in REx 5xx. When the function Apparatus control is included in the terminal, ad-
ditional 32 event function blocks EV13-EV44, running with a slower cyclicity, are
available.
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