How to clear the delay calculagraph when an alarm returns to normal

[Product_Support]

Issue

At the end of an alarm delay if the point is still in alarm, Continuum will generate the alarm notification regardless of how many times the point has "return to normal" (RTN) during the delay period. If the point goes in to alarm again, Continuum will generate the alarm soon.

There is a perception that the alarm delay calculagraph should be cleared when the point has RTN.

Product Line

Andover Continuum

Environment

• Cyberstation
• IP level controller
• Field Controller

Cause

The behavior of the alarm delay calculagraph in some situations is not what would be expected.

Resolution

1. Create an infinityNumeric  point to trigger the alarm
2. Create an program to set the alarm point to on/off

For Example:

The original alarm point is Fanfault, and delay time setting in the AlarmEnrollment is 60 seconds. Create an infinitynumeric named "Fan_alarm" and attach an AlarmEnrollment with a delay.

Create the program below: 

Line detecting:
  Fan_alarm=off
  if Fanfault is on then go to setting

Line setting
  if Ts>=60 then Fan_alarm=on
  if Fanfault is off then goto detecting

Line E
  state=enabled
  if ts>1 then go to detecting

For more detail about AlarmDelay Operation, see AlarmDelay operation.