1
1-4
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
1.2 Components in Open-Loop Positioning
In Figure 1-4 you can see the control circuit and components of an open-loop
positioning system.
Leistungs-
ansteue-
rung
Safety
device
Line voltage
Mechanical
transmission
elements
CPU
Parameterization interface
and function blocks
PC
EMER-
GENCY
STOP
Power
controller
Processing
stations
Limit switch
M
Encoder
Motion
FM 351 Positioning
Function Module
Motor
Figure 1-4 Electronic Cam Controller
The power controller is controlled via digital outputs. It may, for example,
consist of a contactor circuit.
The power controller switches the motor off:
When operating faults occur (user presses EMERGENCY STOP switch)
When the limit switch is reached (safety device trips the power controller)
The motor is controlled by the power controller and drives the axis.
The FM 351 Positioning Function Module determines the present actual posi-
tion of the axis via an encoder. Here, pulses are measured which are propor-
tional to the distance moved.
On reaching certain axis positions the power controller is controlled appropri-
ately via the digital outputs.
Control Circuit
Power Controller
Motor
FM 351
Positioning
Function Module
Product Overview
To Next Page
Loading...
