Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 139)

9 • Set up alarms
9-19
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A change in the trigger connection’s value does not necessarily indicate an alarm—the
value might still be within acceptable limits.
How the Ack connection works
When the application starts, this connection has a value of 0.
How the value changes
 When the operator acknowledges an alarm by pressing the acknowledge alarm button,
FactoryTalk View sends the alarm’s trigger value (or bit position, for bit triggers) to
this connection, and holds the value as long as the operator presses the button, or for
the duration of the hold time, whichever is longer. Then the connection’s value is reset
to 0.
 When the operator acknowledges all alarms, or the alarms for this trigger only, by
pressing the acknowledge all alarms button, FactoryTalk View sends the trigger’s
“Acknowledge all” value to this connection, and holds the value as long as the
operator presses the button, or for the duration of the hold time, whichever is longer.
Then the connection’s value is reset to 0.
 When the Remote Ack connection changes to a new non-zero value that matches the
trigger value of an unacknowledged alarm, FactoryTalk View sends the trigger’s value
(or bit position, for bit triggers) to this connection, and holds the value for the duration
of the hold time. Then the connection’s value is reset to 0.
To avoid confusion about whether a specific trigger’s alarm individual alarm has been
acknowledged or all alarms for the trigger have been acknowledged, make sure the
“Acknowledge all” value is not the same as one of the trigger values.
How the Remote Ack connection works
The Remote Ack connection allows for the remote acknowledgement of alarms. The data
source writes the alarm’s trigger value (or bit position, for bit triggers) to this connection,
and the unacknowledged alarm with this trigger value is acknowledged.
If you assign this connection and specify an “Acknowledge all” value for the trigger,
when the data source sends the “Acknowledge all” value to this connection, all
unacknowledged alarms for the trigger are acknowledged.
Make sure that the “Acknowledge all” value is not the same as one of the trigger values.
Set up the data source to send the correct value to the Remote Ack connection when you
want a remote acknowledgement to take place.