Rockwell Automation 4100 AEC Absolute Encoder Converter Installation - Manual (Page 44)

Publication 4100-UM052B-EN-P - October 2001
36 Operation
Position at Start-up In locked mode, the AEC sends incremental position after receiving
incremental strobe pulses. The AEC, when configured for free-running
mode for controlling hardware other than the Compact or 1394, sends
the incremental position at start-up. In this mode, the AEC behaves
like an incremental encoder. Neither mode requires an absolute
update to begin transmitting positional information.