Configuration and operation
5.11 STEP 7 configuration of individual parameters
CP 1243-1 PCC
Operating Instructions, 02/2015, C79000-G8976-C384-01
49
Analog value preprocessing
Depending on the data point type, the functions for analog value preprocessing described
below are supported.
If unipolar transfer is enabled, negative values of analog inputs are corrected to zero.
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.
Siemens Automation
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