Prosoft-technology MVI56-PDPMV1 Instrukcja Użytkownika Pobierz pdf (Strona 46)

Start Here MVI56-PDPMV1 ♦ ControlLogix Platform

User Manual PROFIBUS DPV1 Master

Page 46 of 255 ProSoft Technology, Inc.

March 22, 2011

Scenario 2: The PROFIBUS data fits into two backplane blocks (different PROFIBUS data

count per block)

For this example, we will subtract one word for each I/O backplane block, using

the following backplane configuration:

For this scenario, each backplane block reserves a maximum of 99 words for

PROFIBUS I/O data. The configured PROFIBUS I/O size (100 words) will not fit

into one block, so two backplane input blocks and two backplane output blocks

will be required to transfer the entire PROFIBUS I/O data.

Note: For this scenario, block 0 is no longer required because there are two backplane blocks with

different data.

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 107 99 0 98

2 Input 107 1 99 99

1 Output 104 99 0 98

2 Output 104 1 99 99

Note: This configuration would be inefficient and is therefore not recommended. The previous

example is a more efficient configuration that will accomplish the same thing. 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.

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Prosoft-technology MVI56-PDPMV1 Instrukcja Użytkownika Strona 46