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