Latched Alarm, Steady Led; Latched Alarm, Blinking Leds - ABB REM 543 Technical Reference Manual

ABB Network Partner
4.1.12.2.
4.1.12.3.
REM 543 Protection,
Monitoring and Control

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.
Latched, steady
ACK
ON
ALARM
Off text
Off colour for steady LED
Fig. 4.1.12.2.-1. Example of a latched alarm with steady LED.

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).
Latched, blinking (example 1)
ACK
ON
ALARM
Off text
Off colour for steady LED
Technical Reference Manual
On text Off text
09-24 12:40:00 Off colour for steady LED
On colour for steady LED
On text Off text
09-24 12:40:00 Off colour for steady LED
On colour for blinking LED
Part 1, General
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