Siemens S7-400PLC Spécifications Page 329

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Analog modules
5.25 Analog input module SM 431; AI 8 x 16 Bit (6ES7431-7KF00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
329
Parameters Value range Default
2
Parameter
type
Scope
Temperature unit
4
Degrees Celsius; degrees
Fahrenheit
Degrees Celsius
Noise suppression
400 Hz; 60 Hz; 50 Hz; 10 Hz 60 Hz
Smoothing
None, weak, medium, strong None
Static Module
Reference junction (reference
to the cold junction)
None
Internal
Reference temperature value
dynamic
Internal Static Module
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.
4
Valid for the format of the output temperature and the dynamic reference temperature
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
suppression in Hz
Response time in ms with configured smoothing:
None Weak Medium Strong
10 100 200 1600 3200
50 20 40 320 640
60 16,7 33,3 267 533
400 10 20 160 320
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.
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