ProSoft Technology MVI69L-MBS - Manual (Page 69)

MVI69L-MBS ♦ CompactLogix Platform MVI69L-MBS Backplane Data Exchange
Communication Module User Manual
ProSoft Technology, Inc. Page 69 of 154
January 6, 2014
The processor inserts data to the module's output image to transfer to the
module. The module's program extracts the data and places it in the module's
internal database. The output image for the module is 241 words.
The following illustration shows the data transfer method used to move data
between the CompactLogix processor, the MVI69L-MBS module and the Modbus
Network.
All data transferred between the module and the processor over the backplane is
through the input and output images. Ladder logic is needed 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. This database is defined as virtual MBS data tables with addresses
from 0 to 239 each.