Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 25

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Chapter
3
31
Positioning with the Linear Positioning Module
This chapter explains how the Linear Positioning Module interacts with a
programmable controller to control axis movement within a linear positioning
system.
Figure 3.1 shows how the module functions in a typical positioning system.
Note that the positioning loop closes in the module and functions independently
of the programmable controllers I/O scan rate. The fast loop update time of
2 ms is possible, because the module has a built-in microprocessor.
Figure 3.1
The
Module in a Positioning System
50040
Linear
Displacement
Transducer
Servo Valve
Desired
Velocity
Axis
Velocity
Command
s
Following
Error
dt
Position
Command
s
dt
K
Kp
D/A
Integrator
+
+
F
+
-
Actual
Position
Feed
Forward
+
+
s
dt
Integrator
I
K
dt
D
K
d
+
Derivative
1771-QB MODULE
How the Module Fits in a
Positioning System
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