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Siemens Simatic S7-400 User Manual

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Analog Modules

5-84

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Table 5-51 Parameters of the SM 431; AI 8

14 Bit, continued

Parameter

Scope

Parameter

Type

Default

1

Value Range

Interference
suppression

60 Hz; 50 Hz

50 Hz

Static

Channel

Smoothing

None
Low
Average
High

None

Static

Channel

Ref. junction

None
RTD on Channel 0
Reference temperature value dynamic

None

1

Only in the CC (central controller) is it possible to start up the analog modules with the default settings.

Smoothing of the Measured Values

You fill find information that is generally applicable to the smoothing of analog
values in Section 5.6.

The following figure indicates for the module in the case of a step response the
number of module cycles after which the smoothed analog value applies at almost
100%, depending on the smoothing setting. The figure applies to every change of
signal at an analog input.

50

100

0

63

50

100

150

200

Smoothing:

low:
average:
high:

Module cycles

Signal variation
in percent

Step response for any analog input signal

Figure 5-29

Step Response of the SM 431; AI 8

14 Bit

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