Reference MVI56-DH485R
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ControlLogix Platform
User Manual
DH485 Interface Module for Remote Chassis
ProSoft Technology, Inc.
Page 69 of 97
August 27, 2009
The following illustration shows four different uses and configurations of the CIF
data area:
Example 1 only uses CIF read data and utilizes the maximum read data area.
Example 2 only uses the CIF write data and utilizes the maximum write data
area. Example 3 uses both CIF read and write data. 124 bytes of read data are
used and 120 bytes of write data are used. Example 4 does not use the CIF data
in the application.
