The Digital Alarm block opens and closes contacts based on its alarm state. When the block detects an alarm of the type specified in the Alarm Type area, it closes the contact specified in the Contact Name field. The contact opens based on the Contact Mode area. Possible values are:
|
Button |
Description |
|
Acknowledge |
Opens the digital block when the operator acknowledges the alarm. |
|
Return |
Opens the digital block when the alarm returns to normal. |
|
All Clear |
Opens the digital block when the alarm is acknowledged and cleared. |
|
Never |
Requires the operator to open the contact manually or via other program logic. |
iFIX automatically acknowledges any alarm below the node's alarm priority. This means that if the associated contact is set to clear on Acknowledge, it opens when iFIX acknowledges the alarm. Contacts set to clear in All Clear mode open when the block's current value falls within the defined limits.
