Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 216)

Troubleshooting
Chapter 10
10Ć4
The 3rd and 4th status words for an axis provide either current axis
position, following error, or diagnostic information. You can select which
status to display by controlling the state of bits 11 and 15 of the axis
control word 2 of the command block.
Turn off bits 11 and 15 to display the current axis position as shown in
Figure 10.3. The maximum value is 999.9999 inch or 19999.99 mm. If
the axis exceeds the maximum, it displays the maximum, and the
position-valid bit goes off.
Turn off bit 11 and turn on bit 15 to display the following error as shown
in Figure 10.3. The maximum value is 999.9999 inch or 19999.99 mm.
If the axis exceeds the maximum, it displays the maximum.
Figure 10.3
Position/FollowingĆError/Diagnostic Words Ć with Position or FollowingĆerror Selected
0 0
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Sign:
0 = +
1 = -
<
Metric decimal poiont
BCD position or following-error value
(999.9999 inch or 19999.999 mm max)
Most significant digits
Least significant digits
inch decimal point
Most Significant Position or Following-Error Word
Least Significant Position or Following Error Word
Monitoring the Status Block