DSM250 User’s Manual
Figure 261 – Trigger Configuration – On Alert
Alert Set Delay – The condition for the parameter being monitored must be in its error condition for at least the set delay time before the alert will become active. An interesting use of the set delay when monitoring a bilge pump (for example) is to set the Set Delay to a large value (say 20 minutes). Now, if the bilge pump runs for more than 20 minutes at a time the alert will be triggered.
Alert Clear Delay – The condition for the parameter being monitored must be not in its error condition for at least the clear delay time before the alert will become cleared.
8.3.7.5 Trigger Type is Off Alert
As opposed to high and low alerts that are associated with analog input signals (i.e., many different possible input values), there are also switch alerts that are associated with a binary input value (sometimes called on or off, yes or no, enabled or disabled, set or reset, active or inactive). The switch alert is similar to the high and low alert except that there are no set or reset points. The mere fact that the switch is seen as Off causes the alert to become an active alert (assuming the Set Delay is set to zero). Likewise, if the switch being monitored is seen as On, then the alert becomes inactive (assuming the Clear Delay is set to zero). If the delays are not programmed to zero, then the switch must remain Off for the Set Delay before the alert becomes active, and must remain On for the Clear Delay before the alert becomes inactive.
8.3.7.5.1 Trigger Configuration
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