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Siemens Simatic S7-400 User Manual

Page 343

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Analog Modules

5-127

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

Table 5-71 Parameters of the SM 431; AI 8

RTD

16 Bit, continued

Parameter

Scope

Parameter

Type

Default

2)

Value Range

Interference
suppression

60 Hz; 50 Hz; none

60 Hz

Smoothing

None
Low
Average
High

None

Static

Channel

1)

If you use the module in ER-1/ER-2, you must set this parameter to “No” because the interrupt lines are
not available in ER-1/ER-2.

2)

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

3)

The limit values must be within the temperature range of the connected sensor.

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

50

100

0

63

Smoothing:

low:
average:
high:

Module cycles

Signal variation
in percent

Step response for any analog input signal

60

80

20

100

40

Figure 5-40

Step Response of the SM 431; AI 8

RTD

16 Bit

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