beautypg.com

Siemens Simatic S7-400 User Manual

Page 311

background image

Analog Modules

5-95

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Smoothing of the Measured Values

You will find information that is generally applicable to the smoothing of analog
values in Section 5.6. You can only set strong smoothing for the SM 431; AI 8

14

Bit.

The module cycle time is a constant, irrespective of how many channels are
enabled. It therefore has no effect on the filter settling time, which is defined by the
parameter assignment of interference frequency suppression and smoothing.

Note

It is only advisable to parameterize smoothing if you also parameterize
interference frequency suppression; otherwise, the measured value resolution will
be reduced to 9 bits (analog value representation is right aligned in this case).

Filter Settling Time with Strong Smoothing

Table 5-57 Interference Frequency Suppression and Filter Settling Time with Smoothing of

the SM 431; AI 8

14 Bit (6ES7431-1KF20-0AB0)

Interference Suppression

Smoothing

Filter settling time in ms

None

High

50 Hz

High

100

60 Hz

High

83.333

400 Hz

High

12.5

This manual is related to the following products: