Siemens SIMATIC S7-400 Reference Manual page 311
Automation system module
data
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Parameters
● Temperature unit
4
● Noise suppression
● Smoothing
● Reference junction (reference
to the cold junction)
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
1
ER-1/ER-2.
Only in the CR (central rack) is it possible to start up the analog modules with the default settings.
2
The limit values must be within the temperature range of the connected sensor.
3
Valid for the format of the output temperature and the dynamic reference temperature
4
Measured value smoothing
For generally valid information on analog value smoothing, refer to the section "Conversion
and cycle and response times of analog modules".
The cycle time of the module is a constant in the SM 431; AI 8 x 16 Bit that is not dependent
on the number of channels that are enabled. It therefore has no effect on the step response,
which is defined by the parameter assignment of interference frequency suppression and
smoothing.
Step response
Table 5-72
How response times depend on the configured interference frequency suppression and smoothing of the SM
431; AI 8 x 16 Bit
Interference frequency sup‐
pression in Hz
10
50
60
400
The following figures illustrate the contents of table above. They show the response time
required for a step response before the smoothed analog value is almost applied to 100%.
The figures apply to every change of signal at an analog input.
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
5.25 Analog input module SM 431; AI 8 x 16 Bit (6ES7431-7KF00-0AB0)
Value range
Degrees Celsius; degrees Fahren‐
heit
400 Hz; 60 Hz; 50 Hz; 10 Hz
None, weak, medium, strong
None
Internal
Reference temperature value dy‐
namic
Response time in ms with configured smoothing:
None
100
20
16,7
10
Default
2
Degrees Celsius
60 Hz
None
Internal
Weak
Medium
200
1600
40
320
33,3
267
20
160
Analog modules
Parameter
Scope
type
Static
Module
Static
Module
Strong
3200
640
533
320
311
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