Siemens SIMATIC ET 200SP Manual - Halaman 17

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Smoothing

The individual measured values are smoothed by filtering. The smoothing can be set in

4 levels.

Smoothing time = number of module cycles (k) × cycle time of the module.

The following figure shows how many module cycles it takes for the smoothed analog value

to approach 100%, depending on the configured smoothing. This applies to every signal

change at the analog input.

①

②

③

④

Image 4-1

Interference frequency suppression

Suppresses the interference affecting analog input modules that is caused by the frequency

of the AC voltage network used.

The frequency of the AC voltage network can negatively affect the measured value, in

particular when measuring in the low voltage range and with thermocouples. With this

parameter, the user specifies the line frequency that is predominant in the plant.

Analog input module AI 2xU ST (6ES7134-6FB00-0BA1)

Manual, 12/2015, A5E36104728-AA

No smoothing (k = 1)

Weak (k = 4)

Medium (k = 8)

Strong (k = 16)

Smoothing for AI 2xU ST

Parameters/address space

4.3 Explanation of the parameters