Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 133)

Configuring alarms

6–7
Alarms for digital tags
Digital tags are either on or off. Therefore, alarms for digital tags do
not have thresholds. They have alarm states.
2.
The alarm states are:
Alarm severity
Alarms can range in severity from one to eight to indicate different
levels of importance. One is most severe, eight is least severe. For
example, a level–four alarm might warn that a vat is half full of liquid
while a level–one alarm indicates that the vat is about to overflow.
Both alarms monitor the same tag but have different severity levels.
When you configure alarm severity, you specify what severity levels
mean and what actions they will trigger. Severity determines the
destination of alarm messages. It also determines the color of the text
in the alarm summary and the order in which alarms are displayed in
an alarm banner.
On Triggers an alarm when a tag has a value of 1.
Off Triggers an alarm when a tag has a value of 0.
Any
Change* Triggers an alarm when a tag value changes from 0 to
1 or from 1 to 0.
Changes
to On* Triggers an alarm only when a tag value changes from
0 to 1.
Changes
to Off* Triggers an alarm only when a tag value changes from
1 to 0.
The * indicates change–of–state types. These types are considered
out of alarm immediately after the change of state.
IMPORTANT