Reference MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 104 of 172 ProSoft Technology, Inc.
September 20, 2018
The following illustration shows the data transfer method used to move data
between the ControlLogix processor, the MVI56E-MNETC/MNETCXT module
and the Modbus TCP/IP Network.
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
ControlLogix 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 a virtual Modbus data table with
addresses from 0 (40001 Modbus) to 9999 (50000 Modbus).
Module’s Internal Database Structure
10,000 registers for user data
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