Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 534)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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How information messages work
These are the key parts of the information message system:
 Information message file—a text file containing a list of messages, with a numeric
trigger value for each message
 Information message display—a graphic display that opens at run time and shows
information messages
 Value connection—a tag or expression. When the value of this connection matches a
message’s trigger value, the information message display opens with the associated
message shown.
The following example shows how the key parts of the information message system work
together.
Example: Set up the data source to show information messages
This example shows how to set up the data source to notify the operator that a conveyor
belt has stopped. In this example, the status of two conveyor belts is being monitored. You
can use both HMI and data server tags.
1. Create a digital tag called Conveyor_1_status. This tag points to an address in a
programmable controller that is linked to a sensor on the first conveyor belt. When the
belt is running, the tag’s value is 0. When the belt stops running, the value changes to
1.
2. Create a second digital tag called Conveyor_2_status. This tag points to an address in
a programmable controller that is linked to a sensor on the second conveyor belt.
When the belt is running, the tag’s value is 0. When the belt stops running, the value
changes to 1.
3. Create an analog tag called Information_messages. Set up the data source to send a
value of 1 to this tag when Conveyor_1_status has a value of 1, and to send a value of
2 to this tag when the Conveyor_2_status tag has a value of 1.
4. In the Information Messages editor, create these messages with trigger values
matching the values that will be sent to the Information_messages tag:
Trigger value Message
1 Conveyor belt 1 has stopped.
2 Conveyor belt 2 has stopped.