2-1
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
Principles of Positioning
Encoders supply pulses or numerical values as output signals. The encoder
output signals describe the displacement of the load to be positioned. When
the displacement reaches a specified setpoint, then with controlled position-
ing the drive is switched over or switched off.
Power
controller
M
Target
Load
MotorEncoder
FM 351
Positioning
Function
Module
Figure 2-1 Controlled Positioning
Each positioning process has the following features:
A target position to which the load is positioned.
A travel range.
Parameters determining the positioning sequence.
The target position is first approached at high speed (rapid speed). At a speci-
fied distance from the target position the speed is switched to a lower speed
(creep speed). Shortly before the axis reaches the target position, and also at
a specified distance from the target position, the drive is switched off. The
FM 351 executes the target approach and ensures reliable positioning. The
FM 351 is a positioning module for open-loop positioning.
What Does
’Controlled
Positioning’
Mean?
Open-Loop
Positioning
2
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