Block alarm detection is based on the OUT value. You can configure the alarm limits of the following standard alarms:
This block supports conditional alarming. Enabling conditional alarming makes additional parameters available for this block. On standard AI blocks, enable and disable conditional alarming from the Block Alarms dialog (right-click the block and select Assign Alarm). For AI blocks converted to fieldbus enable conditional alarming from the Block Alarms dialog or by using the CONDALM_ENABLED parameter.
NAMUR Alarming
If the high high and low low alarm limits are changed to a value outside the range defined in OUT_SCALE and the PV exceeds the alarm limits, the PV status high and low limits, respectively, are set. In this case, the associated active alarm parameters indicate that the measurement is overrange/underrange. If these alarm limits are set more than 3% outside the span of OUT, the active alarm condition is set after the overrange condition elapsed time exceeds four seconds.