ProSoft Technology MVI69E-MBS - Manual (Page 72)

MVI69E-MBS Backplane Data Exchange MVI69E-MBS ♦ CompactLogix Platform
User Manual Communication Module
Page 72 of 162 ProSoft Technology, Inc.
January 6, 2014
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:
Offset Description Length (words)
0 Write Block ID 1
1 to (n) Write Data (n)
(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 used to determine 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:
Offset Description Length (words)
0 Read Block ID 1
1 Write Block ID 1
2 to (n+1) Read Data (n)
(n) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration
file).