MVI69E-MBS ♦ CompactLogix Platform MVI69E-MBS Backplane Data Exchange
Modbus Serial Enhanced Communication Module User Manual
ProSoft Technology, Inc. Page 65 of 154
June 28, 2017
All data transferred between the module and the processor over the backplane is
through the input and output images. Ladder logic in the CompactLogix or
MicroLogix 1500-LRP processor interfaces 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 the maximum number of points for each data type.
4.3 Normal Data Transfer
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:
(n) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration
file).
The Write Block ID is an index value that determines 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:
(n) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration
file).
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