
MVI-ADM ♦ 'C' Programmable Understanding the MVI-ADM API
'C' Programmable Application Development Module Developer's Guide
ProSoft Technology, Inc. Page 35 of 342
February 20, 2013
Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module’s
internal database in registers 0 to 4999 and the status data. These data are
transferred through read (input image) and write (output image) blocks. The
structure and function of each block is discussed in the following topics.
Block Request from the Processor to the Module
These blocks of data transfer information from the processor to the module. The
following table describes the structure of the output image.
The Write Block ID is an index value used to determine the location in the
module’s database where the data will be placed. Each transfer can move up to
200 words (block offsets 1 to 200) of data.
Block Response from the Module to the Processor
These blocks of data transfer information from the module to the ControlLogix
processor. The following table describes the structure of the input image.
Port 1 Current Error/Index
Port 2 Current Error/Index
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