Prosoft-technology MVI69L-MBS Manuel d'utilisateur télécharger pdf (Page 70)

MVI69L-MBS Backplane Data Exchange MVI69L-MBS ♦ CompactLogix Platform

User Manual Communication Module

Page 70 of 154 ProSoft Technology, Inc.

January 6, 2014

4.3 Normal Data Transfer

Normal data transfer includes the paging of the user data found in the module’s

internal database and the status data. These data are transferred through read

(input image) and write (output image) blocks. The following topics describe the

structure and function of each block.

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 240

Write Data

240

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 241

Read Data

240

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 153 154

Pas de commentaire

Prosoft-technology MVI69L-MBS Manuel d'utilisateur Page 70