Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 49)

Publication 1756-UM534B-EN-P - November 2010 49
Configure Scanner Mode Chapter 2
6. Enter the configuration data and click OK.
7. On the I/O Module Properties dialog box, select how you want the
block transfer to update.
There are three update modes: automatic, semi-automatic, and manual.