B&B Electronics VFG3000 - Manual - Manual (Page 76)

E DITING F LAG T AGS V LINX F IELDBUS G ATEWAY M ANAGER U SER M ANUAL
P AGE 60
T
HE
A
LARMS
T
AB
The Alarms tab of a flag variable or formula contains the following properties...
• The Event Mode property is used to indicate the logic that will be used to decide
whether the alarm should activate. The tables below list the available modes.
M ODE A LARM WILL ACTIVATE WHEN …
Active On The tag is true.
Active Off The tag is false.
The following modes are only available when a setpoint is defined…
M ODE A LARM WILL ACTIVATE WHEN …
Not Equal to SP The tag does not equal its setpoint.
Off When SP On The tag does not respond to an ON setpoint.
On When SP Off The tag does not respond to an OFF setpoint.
Equal to SP The tag equals its setpoint.
• The Event Name property is used to define the name that will be displayed in the
alarm viewer or in the event log as appropriate. Fieldbus Gateway Manager will
suggest a default name based upon the tag’s label, and the event mode that has
been selected.
• The Trigger property is used to indicate whether the alarm should be edge or
level triggered. In the former case, the alarm will trigger when the condition
specified by the event mode first becomes true. In the latter case, the alarm will
continue in the active state while the condition persists. This property can also be
used to indicate that this alarm should be used as an event only. In this case, the
alarm will be edge triggered, but will not result in an alarm condition. Rather, an
event will be logged to the Gateway’s internal memory.
• The Delay property is used to indicate how long the alarm condition must exist
before the alarm will become active. In the case of an edge triggered alarm or