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. |