Siemens SIMATIC S5 ET 200U - Schematic of a Reference Point Approach Operation

9-35
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
A conveyor belt transports objects from point A to point B. A rotary position
encoder is used, together with a BERO proximity switch as reference trans-
mitter. The conveyor belt is marked at a definite point. As soon as this mark
comes within the range of the BERO, the BERO produces a reference signal.
Following the reference point approach, the enable input is set via a digital
output module (see Figure 9-20).
IM 318–B DAPS
Enable Input
Reference Input
Traversing Path
Traversing Range
Rotary Position
Encoder
Operation Range of
Reference Transmitter
Conveyor Belt
Counting–UP
Direction
Mark
BERO
AB
Figure 9-20 Schematic of a Reference Point Approach Operation
Example
Function Modules