Prosoft-technology MVI69-ADM Manual de usuario descargar pdf (Pagina 38)

Understanding the MVI-ADM API MVI-ADM ♦ 'C' Programmable

Developer's Guide 'C' Programmable Application Development Module

Page 38 of 342 ProSoft Technology, Inc.

February 20, 2013

All data transferred between the module and the processor over the backplane is

through the input and output images. Ladder logic must be written in the

CompactLogix processor to interface the input and output image data with data

defined in the Controller Tags. All data used by the module is stored in its internal

database. The following illustration shows the layout of the database:

Module’s Internal Database Structure

5000 registers for user data

4999

3000 words of configuration and

status data

5000

Status and Config

7999

Data contained in this database is paged through the input and output images by

coordination of the CompactLogix ladder logic and the MVI69-ADM module's

program. Up to 242 words of data can be transferred from the module to the

processor at a time. Up to 241 words of data can be transferred from the

processor to the module. The read and write block identification codes in each

data block determine the function to be performed or the content of the data

block. The block identification codes used by the module are listed below:

Block Range

Descriptions

-1

Status Block

1 to 999

Read or write data

9998

Warm-boot control block

9999

Cold-boot control block

Each image has a defined structure depending on the data content and the

function of the data transfer.

Normal Data Transfer

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

internal database in registers 0 to 4999 and the status data. These data are

transferred through read (input image) and write (output image) blocks. The

structure and function of each block is discussed in the following topics:

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Prosoft-technology MVI69-ADM Manual de usuario Pagina 38