American Fibertek N-TAH - Manual (Page 26)

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Alarm Setup
The Alarm Setup screen is used to configure the N-TAH’s alarm inputs, and the actions
to be taken when each input is triggered. The hardware alarm contact inputs can have
their trigger conditions and actions independently configured.
Alarm settings
Each alarm input has an associated user-settable text label. The alarm name label is
supplied along with the number when reporting the status of an alarm input to a Pilot
server. This label may be up to 15 characters long.
The Input Type setting selects if the normal (non-alarm) state is contact input closed or
contact input open. In Normally Open mode an alarm will be registered when the two
contact input terminals are shorted to each other. In Normally Closed mode an alarm
will be registered when the two contact inputs are not shorted to each other. The default
mode is Normally Open.
The Supervision setting selects if the alarm input is a normal contact closure or a
supervised contact closure. In supervised mode the contact closure will only be
registered if a 1K resistance value is measured across the alarm input terminals. An
open circuit and a short circuit will both be detected as no contact closure. The default
mode for Supervision is Normal (non-supervised) contact mode.
The duration setting sets a minimum time for which the alarm condition must be
maintained before an alarm is triggered. Setting the duration to “Static” will cause the N-
TAH to trigger an alarm the instant it detects an alarm condition. If a longer duration is
selected the N-TAH will not trigger an alarm until the input has been maintained
continuously for that duration.
Setting Default Value Range
Name “alarm-N” 15 characters
Input Type Normally Open Normally Open
Normally Closed
Supervision Normal Normal
Supervised
Duration 1 second Static
1,5,15,30,or 45 seconds
1 or 5 minutes