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ProSoft Technology MVI69-GSC User Manual

Page 76

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Reference

MVI69-GSC ♦ CompactLogix or MicroLogix Platform

User Manual

Generic ASCII Serial Communication Module

Page 76 of 102

ProSoft Technology, Inc.

September 24, 2010

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

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

program. Up to 60 words of data can be transferred from the module to the

processor at a time. Up to 60 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

0 to 127

Normal Data Blocks for Read and Write

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 to and from the

module’s ports and bringing in 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: