PSRmodular system
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Samples per second
(2.5 ... 4000)
This parameter enables the selection of the sampling
rate for the analog-to-digital converter.
Lower values correspond to slower yet better
measurements in relation to noise. Higher values
make the system more sensitive to measured value
changes.
If the values 50 and 60 are selected, the suppression
of interference at 50 Hz and 60 Hz by the power supply
network is automatically activated.
Figure 5-83 Selection options for “Samples per second”
The safety-related accuracy of the safety function is the result of:
1. The safety-related accuracy of the module (see “Technical data”).
as well as
2. The measuring accuracy of the sensor. Refer to the technical data of the sensor for this
value.
Minimum required sampling rate and maximum permissible sensor signal
frequency
The table below illustrates the relationship between the minimum required sampling rate
and the maximum permissible sensor signal frequency. This table must be taken into con-
sideration when configuring the input parameters:
Sampling rate ≥ minimum sampling rate relative to the expected input signal frequency. The
sampling rate influences the response time of the system.
A low sampling rate corresponds to longer measurement response times (slower system re-
sponse to measured-value changes) and better immunity to noise.
In contrast, a higher sampling rate corresponds to shorter measurement response times
(faster system response to measured-value changes) and therefore also a more sensitive
system response to measured-value changes.
With an expected input signal frequency ≤ 3.5 Hz, a sampling rate of 50 Hz or 60 Hz is rec-
ommended depending on the signal frequency of the power supply network.
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