Rockwell Automation 1771-QB Linear Pos. - Manual (Page 91)

Formatting Module Data (WRITES)
Chapter 7
7Ć12
Example: Retracting in the Positive Direction
In this example, the polarity of the axis has been reversed. The positive
direction is now towards the transducer head as indicated by the sign of the zero
position offset. Notice that the software travel limit in the positive direction can
have a negative sign.
Figure 7.11
Retracting in the Positive Direction
ZeroĆposition = +5.000
Positive Limit = -5.0
Negative Limit = -20.0
Negative
Direction
Neg.
Limit
-20
Origin
0 +5
50014
Pos.
Limit
-5
Examples: ZeroĆPosition Left of the Transducer Head
The next two examples demonstrate configurations with the origin past the fully
retracted position.
Figure 7.12
ZeroĆPosition Left of the Transducer Head
ZeroĆposition = +10.000
Positive Limit = +45.0
Negative Limit = +15.0
Positive
Direction
Pos.
Limit
+45
Origin
0 +10
50015
Neg.
Limit
+15
ZeroĆposition = -10.000
Positive Limit = -15.0
Negative Limit = -45.0
Negative
Direction
Neg.
Limit
-45
Origin
0 -10
50016
Pos.
Limit
-15