Run Limit Alarm
Run limit alarms represent multiple points either all above or all below the center line on the chart.
For alarm rule 2, the limit and length values are used for both the upper and lower charts and for both the upper and lower regions of the charts. The data points on the chart are verified against the center line of the chart. For alarm rule 2, an alarm is triggered when there are <Limit> number of data points in the <Length> data point string that are either all above or all below the center line.
You can also use alarm rules, 24, 25, 26, or 27 to specify the limits and lengths for upper and lower charts and also for upper and lower regions of upper and lower charts.
Features
Following are the alarm properties defined for Run Limit Alarm
:
Alarm Name | Property Name | Parameter | Data Type | Description |
|---|---|---|---|---|
Allow Upper Chart Run Limit Alarm |
| Boolean | Enables run limit alarms for upper chart | |
Allow Lower Chart Run Limit Alarm |
| Boolean | Enables run limit alarms for lower chart | |
Alarm 2 | Limit of Run Limit Alarm |
| Integer | Sets the limits and length values to determine the alarm |
Length of Run Limit Alarm |
| Integer | ||
Alarm 24 | Limit of Upper Chart Above Center Line Run Limit Alarm |
| Integer | Sets the limits and length values to check for data above the center line of the upper chart |
Length of Upper Chart Above Center Line Run Limit Alarm |
| Integer | ||
Alarm 25 | Limit of Upper Chart Below Center Line Run Limit Alarm |
| Integer | Sets the limits and length values to check for data below the center line of the upper chart |
Length of Upper Chart Below Center Line Run Limit Alarm |
| Integer | ||
Alarm 26 | Limit of Lower Chart Above Center Line Run Limit Alarm | WELowerChartAboveCLRunAlarmLimit | Integer | Sets the limits and length values to check for data above the center line of the lower chart |
Length of Lower Chart Above Center Line Run Limit Alarm | WELowerChartAboveCLRunAlarmLength | Integer | ||
Alarm 27 | Limit of Lower Chart Below Center Line Run Limit Alarm | WELowerChartBelowCLRunAlarmLimit | Integer | Sets the limits and length values to check for data below the center line of the lower chart |
Length of Lower Chart Below Center Line Run Limit Alarm | WELowerChartBelowCLRunAlarmLength | Integer |
Example
If you define alarm rule 24 with limit as 7 and length as 8, the rule is violated when 7 or more points in a string of 8 adjacent points are either above or below the center line of the upper chart. In the below illustration, 7 points are above the center line and are marked as a crule violation.
Graphical representation of Run Limit Alarm
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