Prosoft-technology MVI56-PDPMV1 Manual de usuario descargar pdf (Pagina 47)

MVI56-PDPMV1 ♦ ControlLogix Platform Start Here

PROFIBUS DPV1 Master User Manual

ProSoft Technology, Inc. Page 47 of 255

March 22, 2011

Scenario 3: The PROFIBUS data fits into two backplane blocks (same PROFIBUS data count

per block)

For this example, we will split the PROFIBUS data evenly within two backplane

blocks, using the following backplane configuration:

For this scenario, each backplane block reserves 50 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.

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 58 50 0 49

2 Input 58 50 50 99

1 Output 55 50 0 49

2 Output 55 50 50 99

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

(Scenario 1) 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 Manual de usuario Pagina 47