Configuration and operation
5.8 Notes on configuring individual functions
CP 1243-1 DNP3, CP 1243-1 IEC
52 Operating Instructions, 02/2014, C79000-G8976-C312-02
Exception: The value -32768 / 8000
h
as fault ID for wire break of live zero hardware analog
inputs is transferred. With a software input, on the other hand, all values lower than zero are
corrected to zero.
If mean value generation is active, this parameter has no effect.
Analog values that fluctuate quickly can be smoothed with this 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
x
n
= value acquired 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
If mean value generation is active, this parameter has no effect.
An analog value in the overflow range (32767 / 7FFF
h
) or underflow range (-32768 / 8000
h
)
is not transferred for the duration of the error suppression time. This also applies to live zero
inputs. The value in the overflow/underflow range is only sent after the error suppression
time has elapsed, if it is still pending.
If the value returns to the measuring range before the error suppression time elapses, the
current value is transferred immediately.
A typical use case for this parameter is the suppression of peak current values when starting
up powerful motors that would otherwise be signaled to the control center as a disruption.
The suppression is adjusted to analog values that are acquired 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).
If mean value generation is active, this parameter has no effect.
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 enabled for preprocessed values.
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