Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL User Manual
Page 62
4–14
Planning an Application
Publication 2706-817
Example 2
Two messages are bit triggered at the same time. Assume all display
lines are available and the messages are assigned to the same line.
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Message A Display Line 1
Bit 2 Word 0 set
Message B
Display Line 1
Bit 0 Word 1 set
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Word 0
Word 1
Result: Message A is displayed at once. After Message A is
terminated, Message B will be displayed if its corresponding bit is
still set. If its bit is no longer set, Message B will not be displayed
unless it is triggered again.
Example 3
Three messages are bit triggered at the same time. Assume all
display lines are available and two of the messages are assigned to
the same line.
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Message A Display Line 1
Bit 2 Word 0 set
Message B Display Line 2
Bit 0 Word 1 set
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
2
3
4
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6
7
8
9
10
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14
15
Word 0
Word 1
Message C Display Line 1
Bit 14 Word 1 set
Result: Messages A and B are displayed at once. After Message A is
terminated, Message C will be displayed if its corresponding bit is
still set.
Bit and Value trigger priority
A bit triggered message and a value triggered message may be
triggered at the same time.
•
If the messages are assigned to different display lines, both
messages will be displayed.
•
If the messages are assigned to the same display line, priority is
determined by the Trigger Priority attribute in the Terminal Setup
Advanced dialog. See Page 10–17.