Analog Value Preprocessing" Parameter Group; Analog Value Preprocessing - Siemens SIMATIC NET S7-1200 Operating Instructions Manual

Sequence of analog value processing
1. Reading the data from the input area of the CPU
2. Analog value preprocessing (part 1)
3. Threshold value calculation (if Threshold value trigger is configured)
4. Analog value preprocessing (part 2)
5. Storage of the value in the send buffer
5.8.6.3

"Analog value preprocessing" parameter group

Data point configuration - "Analog value preprocessing"
With the following data point types, the analog input data can be preprocessed on the CP if
the data point is configured as an event:
● DNP3:
● IEC:
Even if you do not configure any analog value preprocessing, keep the automatic threshold
value processing in mind, refer to the section Threshold value trigger (Page 54).
5.8.6.4

Analog value preprocessing

Depending on the data point type, the functions for analog value preprocessing described
below are supported.
Unipolar transfer
If unipolar transfer is enabled, negative values of analog inputs are corrected to zero.
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
Processing involves the following steps:
– Mean value generation
- Mean value generation configured: Calculation and then continued at point 4.
- No mean value generation configured: Continue with "Unipolar transfer".
– Unipolar transfer (if configured)
– Error suppression time (if configured)
– Smoothing (if configured)
– Adjustment to the start of measuring range and end of measuring range (if configured)
Transfer of the value to the partner if trigger and threshold value conditions are met.
– Analog Input Event (32) (16 bits)
– Measured value, scaled <11> / Measured value, scaled with time <35>
– Measured value, floating point <13> / Measured value, floating point with time <36>
Configuration and operation
5.8 Notes on configuring individual functions
51