Technical data

SINAUT TD7 software package for the CPU
2.5 Data point typicals
Software
240 System Manual, 07/2009, C79000-G8976-C222-07
With this parameter, you can specify whether the analog values to be
acquired are transferred as mean values.
If you select mean value generation, the currently pending analog value is
acquired cyclically and accumulated. The acquisition cycle depends on the
SamplingPeriod parameter (for example 500 ms, see also the description of
this parameter). The mean value is calculated from the accumulated values
as soon as a transmission is triggered over the TriggerInput input. 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 general or single request. The duration of
the mean value calculation period is then the time from the last transmission
(for example triggered over TriggerInput) to the time of the general or single
request. Once again, the accumulation restarts so that the next mean value
can be calculated.
If the acquired analog value is above or below the permitted range (7FFFH
bzw. 8000H), 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 FaultSuppressionTime parameter:
FaultSuppressionTime = 0
Acquisition of a value above or below the allowed range results in an
immediate cancelation of the mean calculation. The value 7FFFH or 8000H
is saved as an 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
above or below the permitted range, this new value is again saved
immediately as an invalid value and sent when the next message is
triggered.
FaultSuppressionTime > 0
If the acquired analog value is above or below the permitted range, the bad
values are excluded from the calculation of the mean value for a maximum
duration as defined by the FaultSuppressionTime. If this period is exceeded,
the value 7FFFH or 8000H is saved as an invalid mean value and sent when
the next analog value message is triggered. This procedure is repeated in
the new mean value calculation period; in other words, bad values are
suppressed once again for the duration of the FaultSuppressionTime.
The FaultSuppressionTime period allows you to indirectly determine the
percentage of invalid values for each mean value calculation period. For
example, if the mean is calculated every 15 minutes and
FaultSuppressionTime is set to 5 minutes, the mean value is only sent as
invalid when more than 1/3 or 33% of the analog values acquired are above
or below the permitted range in the current mean value calculation period.
If no parameter is specified, the default is FALSE; in other words,
instantaneous values are acquired and transmitted.