Prosoft-technology MVI69E-MBS Manuale Utente Scaricare il pdf (Pagina 72)

MVI69E-MBS Backplane Data Exchange MVI69E-MBS ♦ CompactLogix Platform

User Manual Communication Module

Page 72 of 162 ProSoft Technology, Inc.

January 6, 2014

4.3.1 Write Block: Request from the Processor to the Module

These blocks of data transfer information from the processor to the module. The

structure of the output image used to transfer this data is shown below:

Offset

Description

Length (words)

Write Block ID

1 to (n)

Write Data

(n)

(n) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration

file).

The Write Block ID is an index value used to determine the location in the

module’s database where the data is placed.

4.3.2 Read Block: Response from the Module to the Processor

These blocks of data transfer information from the module to the processor. The

structure of the input image used to transfer this data is shown below:

Offset

Description

Length (words)

Read Block ID

Write Block ID

2 to (n+1)

Read Data

(n)

(n) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration

file).

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Prosoft-technology MVI69E-MBS Manuale Utente Pagina 72