Siemens S7-1200 Operating Instructions Manual page 81

Unipolar transfer
With unipolar transfer, negative values are corrected to zero. This can be desirable if values
from the underrange should not be transferred as real measured values.
Exception: The value -32768 / 8000
Unipolar transfer cannot be configured at the same time as mean value generation.
Mean value generation
With this parameter, acquired analog values are transferred as mean values.
The current values of an analog data point are acquired cyclically and totaled. The number of
acquired 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 time 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.
Overflow range / underflow range
Acquisition of a value in the overflow or underflow range results in the mean calculation
being stopped immediately. The value 32767 / 7FFF
invalid mean value for the current mean value calculation period and sent when the next
analog value message is triggered. The calculation of a new mean value is then started. If
the analog value remains in the overflow or underflow range, this new value is again saved
immediately as an invalid mean value and sent when the next frame is triggered.
Note
Fault suppression time > 0 configured
If you have configured an error suppression time and then enable mean value generation,
the value of the error suppression time is grayed out but no longer used. If mean value
generation is enabled, the error suppression time is set to 0 (zero) internally.
CP 1243-7 LTE
Operating Instructions, 01/2015, C79000-G8976-C381-01
4.15 STEP 7 configuration of individual parameters
for wire break of live zero inputs is transferred.
h
or -32768 / 8000
h
Configuration and operation
is saved as an
h
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