Siemens Simatic M7-400 Reference Manual page 343

Table 5-71 Parameters of the SM 431; AI 8
Parameter
•
Interference
suppression
•
Smoothing
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.
Signal variation
in percent
Smoothing:
Figure 5-40
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
RTD
Value Range
60 Hz; 50 Hz; none
None
Low
Average
High
Step response for any analog input signal
100
63
50
0 20
low:
average:
high:
Step Response of the SM 431; AI 8
16 Bit, continued
2)
Default Parameter
60 Hz
None
Static
40 60
RTD 16 Bit
Analog Modules
Scope
Type
Channel
80 100
Module cycles
5-127