Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 115)

Formatting and Interpreting Data Blocks
Chapter 7
7Ć33
Figure 7.22
Home Position Words
07 06 05 04 03 02 01 00
07 06 05 04 03 02 01 00
Sign:
0 = +
1 = -
BCD home position value
(999.9999 inches or 19999.99 mm
max)
Most significant digits
Least significant digits
11044
Word 17 (Axis 1)
Word 36 (Axis 2)
Word 55 (Axis 3)
External
synchronization of
feedrate overide
0 = disable
1 = enable
LossĆofĆfeedback
detection
0 = disable
1 = enable
inch
metric
17 16 15 14 13 12 11 10
17 16 15 14 13 12 11 10
Word 18 (Axis 1)
Word 37 (Axis 2)
Word 56 (Axis 3)
Most Significant Home Position
Home Position (Least Significant Word)
decimal
point
decimal
point
inch
decimal
point
LossĆofĆFeedback Detection Enable
Turn bit 15 off until you complete the open-loop and closed-loop axis
integration procedures (chapter 9).
Then turn on bit 15 of the most significant home position word to enable
the loss-of-feedback detection feature of the 1771-ES expander.
WARNING: Once you have completed the axis integration
procedures, never turn this bit off. Without loss-of-feedback
detection, if encoder or tachometer feedback is lost, unexpected
axis motion can occur, resulting in damage to equipment and/or
injury to personnel.
External Synchronization of Feedrate Override
Turn on bit 16 of the most significant home position word to have the
1771-ES expander recognize the feedrate override enable input
(Figure 7.22).