Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 75)

Publication 1756-UM534B-EN-P - November 2010 75
Configure Adapter Mode Chapter 3
2. From the BTR Len and BTW Len pull-downs, select the desired lengths.
Select the block transfer Module Type from the pull-down menu that
matches the module on remote I/O. If the desired module is not listed,
select BT-MODULE. Adjust the BTR Length and BTW Length to
match your application. These sizes are determined by the remote I/O
scanner and must match the remote I/O scanner’s configuration.
3. Click OK.