Configuration and operation
4.9 STEP 7 configuration
CP 1242-7 GPRS V2
78 Operating Instructions, 10/2016, C79000-G8976-C311-02
The 500 millisecond cycle is started by the integrative threshold value calculation. In this
cycle, the values are saved even when the following preprocessing options are enabled:
● Unipolar transfer
● Fault suppression time
● Limit value calculation
● Smoothing
Note
Restricted preprocessing options if mean value generation is configured
If you configure mean value generatio
n for an analog value event, the following
preprocessing options are not available:
Unipolar transfer
Fault suppression time
Smoothing
With this parameter, acquired analog values are transferred as mean values.
If mean value generation is active, it makes sense to configure a time trigger..
The current values of an analog data point are read in a 100 millisecond cycle and totaled.
The number of read values per time unit depends on the read cycle of the CPU and the CPU
scan cycle of the CP.
The mean value is calculated from the accumulated values as soon as the transfer is
triggered by a trigger. Following this, the accumulation starts again so that the next mean
value can be calculated.
The mean value can also be calculated if the transmission of the analog value message is
triggered by a request from the communications partner. The duration of the mean value
calculation period is then the time from the last transmission (for example triggered by the
trigger) to the time of the request. Once again, the accumulation restarts so that the next
mean value can be calculated.
Input modules: Overflow range / underflow range
As soon as a value is acquired in the overflow or underflow range, mean value generation is
stopped. The value 32767 / 7FFF
h
or -32768 / 8000
h
is saved as an invalid mean value for
the current mean value calculation period and sent with the next message.
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