Prosoft-technology MVI69-EGD Manual de usuario descargar pdf (Pagina 80)

MVI69-EGD ♦ CompactLogix or MicroLogix Platform Reference

GE Ethernet Global Data Communication Module

Page 80 of 96 ProSoft Technology, Inc.

November 3, 2008

The following illustration shows the data transfer method used to move data

between the CompactLogix or MicroLogix processor and the MVI69-EGD

module.

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 or MicroLogix 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

4000 registers for user data

3999

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

coordination of the CompactLogix or MicroLogix ladder logic and the MVI69-EGD

module's program. Up to 248 words of data can be transferred from the module

to the processor at a time. Up to 247 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 module uses the following block numbers:

Block Range Descriptions

-1 or 0 Empty Data Blocks

1 to 67 Data Read or Write Blocks

2000 CP Status Data

9250 General Status Data

9998 Warm-boot control block

9999 Cold-boot control block

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 95 96

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Prosoft-technology MVI69-EGD Manual de usuario Pagina 80