ABB REF 54 Series Technical Reference Manual page 73

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Technical Reference Manual, General
Latched, steady
ON
ACK
ALARM
Off text
Off colour for steady LED
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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,
acknowledgement 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 color will automatically
change to OFF color. An event is generated on the rising and falling edge of the ON
signal and by acknowledgement. The visual indication, including resetting, of this
alarm mode complies with the ISA-A standard.
Latched, blinking (example 1)
ON
ACK
ALARM
Off text
Off colour for steady LED
Latched, blinking (example 2)
ON
ACK
ALARM
Off text
On text
Off colour for steady LED 09-24 12:40:00
On colour for blinking LED
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The interlocking LED text can be defined in the same manner as for the other alarm
channels. The color of the interlocking LED is yellow and cannot be changed. The
normal LED state is inactive (no light). Furthermore, the interlocking LED has two
special modes. The first mode, recognized by a steady yellow light, indicates that
control operation has been interlocked. The second mode, recognized by a blinking
red light, indicates that the interlocking is in bypass mode (control test mode).
On text Off text
Off colour for steady LED
09-24 12:40:00
On colour for steady LED
On text Off text
09-24 12:40:00 Off colour for steady LED
On colour for blinking LED
On text
On colour for steady LED
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alarind3
alarind2
Off text
Off colour for steady LED
alarind1
73