Configuration
4.18 Data points
CP 1243-8 IRC
156
Operating Instructions, 02/2018, C79000-G8976-C385-03
Input modules
The suppression is adjusted to analog values that are acquired directly by the S7 analog
input modules as raw values. These modules return the specified values for the overflow or
underflow range for all input ranges (also for live zero inputs).
An analog value in the overflow range (32767 / 7FFF
h
) or underflow range (-32768 / 8000
h
)
is not transferred for the duration of the fault suppression time. This also applies to live zero
inputs. The value in the overflow/underflow range is only sent after the fault suppression time
has elapsed, if it is still pending.
Recommendation for finished values that were preprocessed by the CPU:
If the CPU makes preprocessed finished values available in bit memory or in a data block,
suppression is only possible or useful if these finished values also adopt the values listed
above 32767 / 7FFF
h
or -32768 / 8000
h
in the overflow or underflow range. If this is not the
case, the parameter should not be configured for preprocessed values.
For finished values preprocess in the CPU, the limits for the overflow and underflow can be
freely assigned.
Smoothing factor
Requirements for the function
Configuration of the threshold trigger for this data point
Restrictions
The smoothing factor cannot be configured at the same time as mean value generation. A
configured value has no effect when mean value generation is activated.
Function
Analog values that fluctuate quickly can be evened out using the smoothing function.
The smoothing factors are calculated according to the following formula as with S7 analog
input modules.
where
y
n
= smoothed value in the current cycle n
y
n-1
= smoothed value in the previous cycle n-1
x
n
= acquired value in the current cycle n
k = smoothing factor
The following values can be configured for the module as the smoothing factor.
●
1 = No smoothing
●
4 = Weak smoothing
●
32 = Medium smoothing
●
64 = Strong smoothing
