Rockwell-automation 9301 Series RSView32 Users Guide Manual de usuario Pagina 129

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Configuring alarms 6–3
Example: Alarm thresholds
The illustration shows the changing values of a tag monitoring a
motor’s revolutions per minute (rpm). With the threshold settings
illustrated, the motor must run between 2,000 rpm and 3,000 rpm, or
an alarm is triggered. In the illustration, an X shows when the tag goes
into alarm and an O shows when the tag goes out of alarm.
Safe zone
5,000
4,000
3,000
2,000
1,000
1
Thresholds
Threshold
values
Alarm
security
levels
Time
*
*
Increasing
Decreasing
6
5
4
3
2
1
1
4
8
8
6
4
Thresholds must be set up
in ascending order
*
These alarms are triggered only if the check
box ‘Generate alarms when approaching
normal operating range’ is selected in the
Alarm Setup dialog box.
If the motor speed It triggers an alarm of this severity
exceeds 3,000 rpm 8
exceeds 4,000 rpm 4
exceeds 5,000 rpm 1
falls below 5,000 rpm * 4
falls below 4,000 rpm * 8
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