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REM 543 Protection,
Monitoring and Control
Page 47
Technical Reference Manual
Part 1, General
ABB Network Partner
4.1.12.2.
Latched alarm, steady LED
Latched, steady alarms can be acknowledged only when the ON signal is inactive. The
time stamp of the first alarm is recorded. Successful acknowledgement clears the time
stamp line of the alarm view and the corresponding alarm LED. An event is generated
on the rising and falling edge of the ON signal and by acknowledgement.
Fig. 4.1.12.2.-1. Example of a latched alarm with steady LED.
4.1.12.3.
Latched alarm, blinking LEDs
Latched, blinking alarms can be acknowledged after the rising edge of the ON signal.
The time stamp of the first alarm is recorded. If the ON signal is inactive, acknowledge-
ment clears the time stamp line of the alarm view and the corresponding alarm LED.
However, if the ON signal is active during acknowledgement, the alarm LED mode
turns stable and the time stamp is cleared. Later, when the ON signal is deactivated, the
alarm LED colour will automatically change to OFF colour. An event is generated on
the rising and falling edge of the ON signal and by acknowledgement. (The visual indi-
cation, including resetting, of this alarm mode complies with the ISA-A standard).
alarind3
Off text
Off colour for steady LED
On text
09-24 12:40:00
On colour for steady LED
Off text
Off colour for steady LED
ACK
ON
ALARM
Latched, steady
alarind2
ACK
ON
ALARM
Off text
Off colour for steady LED
On text
09-24 12:40:00
On colour for blinking LED
Off text
Off colour for steady LED
Latched, blinking (example 1)