Analog electronic modules
15.8 Overview of parameters of the analog electronic modules
ET 200pro distributed I/O system
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Operating Instructions, 03/2013, A5E00335544-08
Smoothing
Smoothing of the analog values produces a reliable analog signal for further processing. The
smoothing of analog values is useful when handling measured values with a slow rate of
change, for example, temperature measurements.
The measured values are smoothed by means of digital filtering. Smoothing is achieved by
the module calculating a mean value based on a defined number of converted (digitized)
analog values.
The user assigns parameters to smoothing at not more than four levels (none, weak,
medium, strong). The level determines the number of module cycles from which the mean
value is derived.
The stronger the smoothing, the greater the stability of the smoothed analog value. The time
until the smoothed analog value is present after the signal change depends on the level of
the smoothing (see figure below).
The figure below shows the number of cycles a module requires to apply an almost 100%
analog value after a step response, based on the smoothing function settings. The figure
applies to all signal changes at the analog input. The smoothing value defines the number of
cycles a module requires to reach 63% of the end value of the changed signal.
①
Low level smoothing
②
Medium level smoothing
③
High level smoothing
Diagnostics of encoder supply short-circuit to M
If this parameter is enabled, the system generates a diagnostics event when it detects a
short-circuit of the sensor supply to ground. This diagnostics function is enabled alongside
with the group diagnostics function.
