Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual - Manual (Page 43)

3–21 Programming and Operation
Publication 1771-UM002A–EN–P – May 2000
The first word in the status block is reserved for future use (Figure
3.14). Each expander module then uses three words, the first of
which is the status word. The remaining two are position words.
The number of status and position words returned to the PC
processor depends on the highest numbered axis in the stepper
positioning assembly, not on the number of axes used. The status
block must contain four words if only axis 1 is in the system, seven
words if axis 2 is the highest numbered axis, and ten words if axis 3
is in the system.
Figure 3.14
Status Block
17 10 07 00
Data Table
9 9 9
9 9 9
0 0 0
0
0 0 0 0
9 9 9 0 0 0
Status Word, Axis 1
10527
Reserved For Future Use
Status Word, Axis 2
9 9 9 0 0 0 0
1
9 9 9 0 0 0
Status Word, Axis 3
9 9 9 0 0 0 0
0
1
0
1
*
*
*
* reports a negative position
MS Position
LS Position
MS Position
LS Position
MS Position
LS Position
Pulse
Output
Expander
Module #1
Pulse
Output
Expander
Module #2
Pulse
Output
Expander
Module #3