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11
Event register for the
serial communication
The annunciator unit incorporates a separate
event register which contains information on
the type of event and the channel number in-
cluding a synchronous time stamp. This enables
a higher level system to read out events from the
annunciator over the SPA bus serial communi-
cation. The event register holds 50 events. The
time stamps are relative and the time span is
max. 60 s. The clocks of the interconnected
units are synchronized, generally once per sec-
ond, by the higher level system (the SPA bus
master). The time resolution between the chan-
nels is 5 ms.
The annunciator unit also includes a channel
matrix register which operates in parallel with
the event register and in which each channel
corresponds to one bit. If a channel is activated
during an overflow situation of the even register,
the corresponding bit in the matrix register is
activated.
Fig. 9. Event registration in SPACOM systems.
Overflow
Overflow
Time
Slave
Channel
Code
2
1
500
Adding of
users text
Event register
Clock
SPA-bus
Synchronization
SRIO
Printer
Host system
Time
Slave
Channel Code
Channel Code
Time
Events
Clock
0 - 60 s
SACO alarm module
Event
register
Overflow
1
2
3
4
5
6
7
8
9
10
11
14
16
Event overflow
matrix register
SPA-bus
Clock
0 - 60 s
Time
1
2
3
.
.
.
.
n
Channel Code
Events
SPA-bus
SPACOM protective relay module
Event
register
12
13
15
Time marking: year, month,
day, hour and minute
1
2
3
.
.
.
.
.
.
.
48
49
50
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