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
Static
Channel
● Noise suppression
60 Hz; 50 Hz; none
60 Hz
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
80
20
100
40
Signal variation in
percent
Step response for any analog input signal
Smoothing
Low:
average:
high:
Module cycles
Figure 5-37 Step response of the SM 431; AI 8 x RTD x 16 Bit
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
300
Reference Manual, Ausgabe 11/2016, A5E00850736-08