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Technical Reference Manual, General
5()B
73
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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.
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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).
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)
alarind1
ACK
ON
ALARM
Off text
Off colour for steady LED
On text
09-24 12:40:00
On colour for blinking LED
On text
On colour for steady LED
Off text
Off colour for steady LED
Latched, blinking (example 2)