HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 94 of 260
Version: 25F
4.2.2.5 Safety relevant cut-off thresholds encoder systems for position and speed
detection
Plausibility tests with the current position and speed values are performed between both
measuring channels A and B of the SMX100 module as a basic measure, which are then
checked against parameterizable thresholds.
The incremental shut-down threshold describes the tolerable deviation of position between
both sensing channels A and B in the unit of the measuring distance.
The speed shut-down threshold describes the tolerable deviation in speed between both
sensing channels A and B.
Diagnostic functions for the determination of optimal parameter values for the applications are
available within the SCOPE-dialog of the parameterization tool.
Note:
Speed and acceleration are detected values with a minimal digital resolution.
This fact limits the smallest possible detection of speed or acceleration and determines the digital step
width for the input values.
Speed resolution:
Up to a frequency of 500 Hz or 500 steps/s speed is detected with the frequency measuring
method, below this it is measured with a time measuring method. This results in the following
course of the sensing fault:
The digital acceleration resolution is limited by a maximum peak time of 256 ms and the encoder
resolution. The garphs below show the lowest measurable acceleration in dependence on the
resolution in revolutions/min, mm/s² and m/s².
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