alarm-FloatLimitAlarmExt
This alarm extension generates an alarm when a NumericPoints's or NumericWritable's Out slot falls outside a normal range defined by a setpoint, high difference limit, low difference limit, and a deadband. This alarm extension is available in the Extensions folder of the alarm palette.
Algorithm properties
These properties are unique to the FloatLimitAlarmExt.| Property | Value | Description |
|---|---|---|
| Setpoint | number | Specifies the value that is the basis for defining the normal range provided the value and its status is valid. It can be linked to another point. |
| Last Valid Setpoint | number | Specifies the setpoint value when its status and value were last valid. |
| Low Diff Limit | number (0.00–+inf) | Determines the low limit of the normal range by subtracting the value from the last valid setpoint value. |
| High Diff Limit | number (0.00–+inf) | Determines the high limit of the normal range by adding the value to the last valid setpoint value. |
| Deadband | number (0.00–+inf) | Defines the differential value applied to high and low limits before return-to-normal. This value is subtracted from the high limit and added to low limit. |
| High Limit Text | text string | Defines a bformat, which displays when a high limit is exceeded. |
| Low Limit Text | text string | Defines a bformat, which displays when low limit is exceeded. |
| Limit Enable | checkbox optionsLow Limit EnableHigh Limit Enable | Enables the limit settings. |