HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 132 of 189
Version: 50F
5.12.2.5 Extended monitoring with 2 proximity switches
The expanded monitoring detects the following faults:
a) Failure of the supply voltage
b) Failure of the output signal in the driver direction
c) Proximity switch functional failure for high signal
d) Signal path interruption
e) Mechanical maladjustment of proximity switch / excessively large proximity switching
distance
For the diagnostics the two status conditions of the count signals are additionally acquired
synchronously and compared logically. A switch gate must be used to ensure that at least one
of the two signals is actuated. The logic evaluates this rule.
The diagnostics are to be designed for the following limits as a minimum:
Max. count frequency: 4 kHz
Min. count frequency: 1 Hz
Max. blanking 0 signal: 50%
Min. overlap: 10%
Reading the count signals:
The two count signals are each separately assigned to the two channels. The status is read
synchronously in each of the two channels. To ensure synchronism, this action is to be
undertaken immediately after channel synchronisation. The sampling must take place at least
1x per cycle. The max. deviation in the synchronism is 20 µs.
The status conditions must be exchanged cross-wise via the SPI.
Desired theoretical waveform
Design of the switch gate
for radial sensor arrangement
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