
Analog modules
5.24 Analog input module SM 431; AI 8 x RTD x 16 Bit (6ES7431-7KF10-0AB0)
S7-400 Automation System Module Data
318 Reference Manual, Edition 09/2009, A5E00850736-06
Parameters Value range Default
2
Parameter
type
Scope
Temperature coefficient for
temperature measurement
with thermal resistance (RTD)
For platinum (Pt)
0.00385 Ω/Ω/ °C
0.003916 Ω/Ω/ °C
0.003902 Ω/Ω/ °C
0.003920 Ω/Ω/ °C
For nickel (Ni)
0.00618 Ω/Ω/ °C
0.00672 Ω/Ω/ °C
0,00385
Noise suppression
60 Hz; 50 Hz; none 60 Hz
Static Channel
Smoothing None
Weak
Medium
Strong
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 CR (central rack) 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.
Measured value smoothing
You will find information that is generally applicable to the smoothing of analog values in the
respective section.
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
60 8020 10040
Signal variation in
percent
Step response for any analog input signal
Smoothing Low:
average:
high:
Module cycles
Figure 5-38 Step response of the SM 431; AI 8 x RTD x 16 Bit
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