incremental encoder module 1794-ID2

Hello Friends
I'm new to PLC's and am having trouble with A/B's 1794-ID2 encoder module. I have the module addressed, but I need to know how to use write bits. The process needs to count up to a preset value from a panelview and enable a crosscut saw to start (this being the length of the product) when it reaches the preset value, then reset to 0 and start again.
Thanks in Advance

Chapter 3&4 gives an explanation/exxample of this:
http://www.ab.com/manuals/io/1794/1...ype=xml&Collection=English&QueryZip=1794+ID2&

Look in the Instruction Reference for BTR and BTW also.