ProSoft Technology MVI56-PDPMV1 User Manual
Page 48
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MVI56-PDPMV1 ♦ ControlLogix Platform
User Manual
PROFIBUS DPV1 Master
Page 48 of 255
ProSoft Technology, Inc.
March 22, 2011
Scenario 4: The PROFIBUS data fits into ten backplane blocks (same PROFIBUS data count
per block)
For this scenario, each backplane block reserves 10 words for PROFIBUS I/O
data. The configured PROFIBUS I/O size (100 words) will not fit into one block,
so ten backplane input blocks and ten backplane output blocks will be required.
Backplane Block Overview
Block
Number
Input/
Output
Total word count in
Backplane block
PROFIBUS Data
Word Count in
backplane block
Initial PROFIBUS
Data Word Offset in
backplane block
Last PROFIBUS Data
Word Offset in
backplane block
1
Input
18
10
0
9
2
Input
18
10
10
19
3
Input
18
10
20
29
4
Input
18
10
30
39
5
Input
18
10
40
49
6
Input
18
10
50
59
7
Input
18
10
60
69
8
Input
18
10
70
79
9
Input
18
10
80
89
10
Input
18
10
90
99
1
Output
15
10
0
9
2
Output
15
10
10
19
3
Output
15
10
20
29
4
Output
15
10
30
39
5
Output
15
10
40
49
6
Output
15
10
50
59
7
Output
15
10
60
69
8
Output
15
10
70
79
9
Output
15
10
80
89
10
Output
15
10
90
99
Note: This configuration would be extremely inefficient and is therefore not recommended. The first
example (Scenario 1) is a more efficient configuration that will accomplish the same thing much
faster with one backplane transfer. This example is here solely to illustrate how changing the I/O
sizes without changing the amount of PROFIBUS data to be transferred will affect the number of
I/O data blocks the module will need to transfer.