2
2-4
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
2.2 Positioning Velocity Curve
This chapter gives an overview of the basic curve for positioning on a target.
The velocity and also the basic curve mainly depend on the possibilities pro-
vided by the power controller which you are using.
We show you the basic sequence on approaching a target position in Fig. 2-3
below.
For the sake of simplicity we have assumed that the velocity changes linearly
over the distance traveled.
The following basic curve for positioning is then produced:
Target
–1000 mm 1000 mm0
Switchover difference, positive
Switch-off difference, positive
1
2
3
4
Target range
Standstill range
1
2
3
4
v
rapid
v
creep
Figure 2-3 Velocity Curve on Approaching a Target Position (Basic Shape)
Please refer to Chapter 2.3 for the target approach.
The effect of the FM 351 monitoring is shown. In addition, you can see when
the FM 351 signals reaching a position.
You can determine all the statuses during positioning from the response sig-
nals. Please read Chapter 12 for more information.
Introduction
Velocity Curve on
Approaching a
Target Position
Target Approach
Evaluation by
Program
Principles of Positioning
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