Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 266)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
12–10
• •
•
•
•
In the following illustration, an X shows when the tag goes into alarm, and an O shows
when the tag returns to normal.
For information about setting up tag-based deviation alarms, see page 12-26.
Digital alarms
A digital alarm monitors the value of a tag or input for either of these alarm conditions:
the value is equal to zero, or the value is not equal to zero.
FactoryTalk Alarms and Events does not support tag-based, digital change-of-state
alarms. Change-of-state alarms are triggered by any change in the digital tag being
monitored, or when the tag’s value changes to either 0 or 1.
Digital alarms can be latched. This means that the digital alarm will remain In Alarm,
even if its alarm condition returns to normal, until an operator resets the alarm.
For information about setting up tag-based digital alarms, see page 12-23.
FactoryTalk alarm and event displays
To monitor and respond to FactoryTalk device-based and tag-based alarms at run time, use
the following FactoryTalk Alarm and Event objects, embedded in FactoryTalk View SE
graphic displays.
If you want to set up digital change-of-state alarms, use HMI digital tags. For more information,
see Chapter 11, Setting up HMI tag alarms.
FactoryTalk Alarm and Event objects do not show HMI tag alarms. To monitor and respond to
HMI tag alarms, you must use the HMI tag alarm objects available in FactoryTalk View SE. For
details, see Chapter 11, Setting up HMI tag alarms.
Deviation-High
Constant Target
X
Limit
Deviation-Low
Limit
X O XO
X O