Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 140)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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Remote acknowledgement does not take place if the hold time is in effect for the Ack
connection.
Example: Use the Remote Ack connection
This example shows how to use the Remote Ack connection to acknowledge an alarm.
In this example, the same application is run at two different locations on the plant floor,
and both terminals are connected to the same programmable controller. All the tags in the
example refer to addresses in the programmable controller.
1. Create an alarm trigger for a tag called Alarm. Use the Value trigger type.
2. Assign a tag called Ack to the Ack connection.
3. Assign a tag called Remote_ack to the Remote Ack connection.
4. Create an alarm message for the alarm trigger, with the trigger value 1.
5. Set up the data source to write the value at the Ack connection to the Remote Ack
connection whenever the value of the Ack connection changes from 0 to a non-zero
value.
At run time, when an alarm with the trigger value 1 is generated, the alarm message
appears at both locations simultaneously. If the operator acknowledges the alarm at
Location 1, FactoryTalk View writes the value 1 to the Ack connection.
Since the Ack connection is write-only (not read), the acknowledgement doesn’t appear at
Location 2. However, the programmable controller writes the value from the Ack
An alarm’s Trigger and Remote Ack settings should not be configured to use the same tag.
Doing so may cause unpredictable alarm acknowledgement behaviors.