NEX7250 Zone 2 Annunciator
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23. Function Descriptions
Function Numbers are used to describe pre-defined features that can be enabled or disabled by the
Customer as required.
F0- Contact Status
Function F0 allows each window in the annunciator to be illuminated if the associated signal contact
is in the closed state. This is normally used to help the user identify the current state of the input
device from the front of the unit without disturbing plant wiring.
F1- normally open (N/O) or normally closed (N/C) signal input contact
Each alarm input can be configured to allow operation from an N/O or N/C field contact.
FEATURE-F1
STATUS LED
Set channel to operate from a normally open signal input contact
OFF
Set channel to operate from normally closed signal input contact
ON
F2- Individual Channel Output Relay State
This feature is only available if individual channel repeat relays, option RLY, are fitted to the
annunciator.
FEATURE-F2
STATUS LED
Set individual channel repeat relay to be normally energised in non alarm
state
OFF
Set individual channel repeat relay to be normally de-energised in non
alarm state
ON
F3- Manual Or Automatic Reset
Acknowledged alarms can be set to manual reset where the operator must press the reset
pushbutton to clear the alarm after the input has returned to normal or acknowledged alarms can be
set to automatic reset which allows the alarm to automatically clear as soon as the input returns to
normal.
FEATURE-F3
STATUS LED
Set channel to manual reset
OFF
Set channel to automatic reset
ON
F4- Lock-In Or Non-Lock-In Operation
Alarms that occur and return to normal can be set to lock-in where the alarm is maintained until
acknowledge and reset has been pressed. (Depending upon sequence selected) or alarms that
occur and return to normal can be set to non-lock-in which allows the alarm to automatically return to
the off state as soon as the input returns to normal.
FEATURE-F4
STATUS LED
Set channel to lock-in
OFF
Set channel to non-lock-in
ON
