Alternating Center Line Limit Alarm 
Alternating Center Line Limit alarm rules are triggered when multiple points (in a series) are all alternating up and down about the center line on the chart.
For alarm rule 10, the limit and length values are used for both the upper and lower charts. The data points on the chart are checked for the specified number of alternating points. For alarm rule 10, an alarm is triggered when there are <Limit> number of data points in the <Length> that are all alternating up and down about the center line. You can also use alarms 48 or 49.
Features
Following are the Alternating Center Line Limit Alarm properties:
Alarm Name | Property Name | Parameter | Data Type | Description |
|---|---|---|---|---|
Allow Upper Chart Alternating Center Line Limit Alarm | UpperWEAltCenterlineAlarmEnabled | Boolean | Enables alternating center line limit alarm for upper chart | |
Allow Lower Chart Alternating Center Line Limit Alarm | LowerWEAltCenterlineAlarmEnabled | Boolean | Enables alternating center line limit alarm for lower chart | |
Alarm 10 | Limit of Alternating Center Line Limit Alarm | WEAltCenterlineAlarmLimit | Integer | Sets the limit and length to check for alternating points above the center line |
Length of Alternating Center Line Limit Alarm | WEAltCenterlLineAlarmLength | Integer | ||
Alarm 48 | Limit of Upper Chart Alternating Center Line Limit Alarm | WEUpperChartAltCenterlineAlarmLimit | Integer | Defines the limit and length values to check for alternating points above the center line for upper chart |
Length of Upper Chart Alternating Center Line Limit Alarm | WEUpperChartAltCenterLineAlarmLength | Integer | ||
Alarm 49 | Limit of Lower Chart Alternating Center Line Limit Alarm | WELowerChartAltCenterlineAlarmLimit | Integer | Defines the limit and length values to check for alternating points above the center line for lower chart |
Length of Lower Chart Alternating Center Line Limit Alarm | WELowerChartAltCenterLineAlarmLength | Integer |
Example
If you define alarm rule 48 with limit and length as 4 and 5 respectively, the rule is violated if only 4 points in a string of 5 adjacent points in the upper chart are alternating up and down about the center line.
Graphical representation of Alternating Center Line Limit Alarm
