Configuration and operation
4.15 STEP 7 configuration of individual parameters
CP 1243-7 LTE
Operating Instructions, 01/2015, C79000-G8976-C381-01
77
Configuration of the data point index
Within a CP, the indexes of the data point classes must comply with the following rules:
● Input
The index of a data point of the type input must be unique throughout all data point types
(digital inputs, analog inputs etc.).
● Output
– A data point of the type output can have the same index as a data point of the type
input.
– Several data points of the type output can have the same index.
Note
Data points for the inter-station communication with a CP in another S7 station
Note that for inter
-station communication, the indexes of the two corresponding data points
(data point pair) must be identical for the sending and receiving CP, see also section Partner
stations: Configuring the inter
-station communication (Page 85).
Threshold value trigger and Analog value preprocessing
Sequence of processing Threshold value trigger and Analog value preprocessing
Note
Threshold value trigger: Calculation only after "Analog value preprocessing"
Note that the analog value preprocessing is performed before the check for a configured
threshold value.
This affects the value that is configured for the threshold value trigger, refer to the se
ction
(Page 78).
Note
Restricted preprocessing and no Threshold value trigger if Mean value generation is
configured
If you configure mean value generation for an analog value event, the following
preprocessing options are not available:
Unipolar transfer
Error suppression time
Smoothing
If mean value generation is configured, no threshold value trigger can be configured for the
analog value event involved.
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