Reference MVI56-CAS
♦
ControlLogix Platform
Teledyne CA Slave Module
ProSoft Technology, Inc.
Page 51 of 86
December 26, 2007
The following illustration shows the data transfer method used to move data
between the ControlLogix processor, the MVI56-CAS module and the TCA
network.
As shown in the diagram above, 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 data table
with addresses from 0 to 6999. The following illustration shows the layout of the
database:
5000 registers for user data
Register
Data
Status
and
Config
Module’s Internal Database Structure
0
4999
5000
6999
2000 words of configuration
and status data
