Event Register For The Serial Communication - ABB saco 64D4 User Manual

Event register for the
serial communication
14
The annunciator unit incorporates an event reg-
ister which contains information on the type of
event and the channel number including a syn-
chronous time stamp. This enables a higher level
system to read out events from the annunciator
over the SPA bus serial communication. 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 synchro-
nized, generally once per second, by the higher
500
2
Time
Time
1
Time marking: year, month,
Clock
day, hour and minute
Synchronization
SPA-bus
Events
1 Time Channel Code
2
3
.
.
.
.
.
.
.
48
49
50
Overflow
4
1 2 3
5 6 7 8
9 10 11 12
13 14 15 16
SACO alarm module
Fig. 11. Event registration in SPACOM systems.
Event register
Overflow
Slave Channel Code
Slave Channel Code
SPA-bus
Clock
0 - 60 s
Event
register
Event overflow
matrix register
level system (the SPA bus master). The time
resolution between the channels 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 regis-
ter, the corresponding bit in the matrix register
is activated.
SRIO
Adding of
users text
SPA-bus
Events
Time Channel Code
1
2
3
.
.
.
.
n
Overflow
SPACOM protective relay module
Host system
Printer
Clock
0 - 60 s
Event
register