Function Modules S5100U
Figure 15-19. Position of the Reference Point (SYNC Bit=1) during a Reversal of Direction
before Reaching the Reference Pulse in a Positive Direction
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Reference
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Reference
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Reference pulse
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Reference pulse
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Positive direction of traverse
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Sync
bit
Example: Transporting objects from point A to point B on a conveyor belt.
A rotary position encoder is used, together with a BERO proximity switch as reference
transmitter. 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.
Figure 15-20. Schematic of a Reference Point Approach Operation
Rotary position
encoder
Reference input
Mark
BERO as refer-
ence transmitter
Traversing path
Counting-up
direction
DQPS CPU
Traversing range
Operation range
of reference
transmitter
Enable input
Conveyor belt
EWA 4NEB 812 6120-02
15-33
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