Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Analog Modules

4-36

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Conversion and scan times for analog input channels in channel groups

When the analog input channels are grouped in channel groups, you must take into

account the conversion time channel group by channel group.

Example

Two analog input channels of the analog input module SM 331; AI 2 12 bits are

combined to form a channel group. You must therefore grade the scan time in

steps of 2.

Setting smoothing of analog values

You can set the smoothing of the analog values in STEP 7 for some analog input

modules.

Using smoothing

Smoothing of analog values ensures a stable analog signal for further processing.

It makes sense to smooth the analog values with slow variations of measured

values – for example, with temperature measurements.

Smoothing principle

The measured values are smoothed by digital filtering. Smoothing is accomplished

by the module calculating average values from a defined number of converted

(digitized) analog values.

The user assigns parameters to smoothing at not more than four levels (none, low,

average, high). The level determines the number of analog signals used for

averaging.

The higher the smoothing level chosen, the more stable is the smoothed analog

value and the longer it takes until the smoothed analog signal is applied after a

step response (refer to the following example).

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