Configuration and operation
5.8 Notes on configuring individual functions
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
53
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.
If the acquired analog value is in the overflow range (32767 / 7FFF
h
) or underflow range
(-32768 / 8000
h
), this value can either be taken into account immediately in the calculation of
the mean value or it can be suppressed for a specific period for the calculation of the mean
value. The required response can be decided with the Error suppression time parameter:
● Error suppression time = 0
Acquisition of a value in the overflow or underflow range results in the mean calculation
being stopped immediately. 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 when the next
analog value frame 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.
● Error suppression time > 0
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.
Set start of measuring range / Set end of measuring range
In these two input boxes, you set a limit value at the start of the measuring range and at the
end of the measuring range and if these limits are violated, the transfer of a frame is
triggered. Configuration of a threshold value trigger is necessary for this function.
The range of the value that can be configured as a decimal number corresponds to the
measuring range of the analog module (-32768 ... 32767).
By configuring these two values, you specify that the values of this analog value are
transferred as a frame only in the following situations:
● When called up by the master
● When the threshold value trigger fires
● When the value of "Set start of measuring range" is exceeded
● When the value of "Set end of measuring range" is undershot
The parameters "Set start of measuring range" and Set end of measuring range" are
pointless for measured values that have already been preprocessed in the CPU.
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