Siemens ET 200S - Page 500

4 IQ-SENSE
13-6
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Diffuse sensor
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Transmitter
Object
Circuit state 0: No object detected. In other
words, the object is not in the path of the
beams. The receiver cannot see any light.
Circuit state 1: Object detected. In other
words, the object is in the path of the be-
ams. The receiver sees some light.
Receiver
Transmitter
Receiver
Diffuse Sensor
Figure 13-2 Diffuse Sensor
Reflex sensor
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ÄÄÄ
Object
Circuit state 0: No object detected. In other
words, the object is not in the path of the
beams. The receiver sees some light.
Circuit state 1: Object detected. In other
words, the object is in the path of the be-
ams. The receiver cannot see any light.
Transmitter
Receiver
Transmitter
Receiver
Reflex Sensor
Figure 13-3 Reflex Sensor
13.1.4 Switching Hysteresis Parameter
Features
Faults with the diffuse sensor or in the production process can result in signal
wobbles. The measured value then changes the switching threshold by 100 %
(object detected – object not detected). You can prevent this switching threshold
wobble using the switching hysteresis parameter. This will ensure a stable output
signal on the sensor.
You can parameterize 5%/10%/20%/50% for switching hysteresis.