ProSoft Technology MVI69-DFCM - Manual (Page 71)

Reference MVI69-DFCM ♦ CompactLogix or MicroLogix Platform
DF1 Interface Module
ProSoft Technology, Inc. Page 71 of 117
November 3, 2008
If Block Transfer Size = 240:
Write Block
These blocks of data transfer information from the CompactLogix or MicroLogix
processor to the module and source the input (monitored) data to be used by the
remote client. The structure of the output image used to transfer this data is
shown in the following table.
Offset Description Length
0 Write Block ID 1
1 to n Write Data n
where 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 will be placed. Each transfer can move up to
200 words (block offsets 1 to 200) of data.
5.2.3 Special Blocks
Slave Status Blocks
Slave status blocks send status information of each slave device on a master
port. Slaves attached to the master port can have one of the following states: