Rockwell Automation 1440-VAD02-01RA XM-123 Aeroderivative Module - Manual (Page 138)

Publication GMSI10-UM003D-EN-P - May 2010
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4 Get Status BOOL Indicates if a fault or
alarm has occurred. 0 = Operating without alarms or
faults.
1 = Alarm of fault condition
exists. The Overall Value
attribute may not represent the
actual field value.
5 Get Data Units ENGUNIT The units context of the
Overall Value attribute. This setting is determined by the
Channel Object’s Output Data
Units attribute (see page 125).
6 Get/Set Measurement USINT The measurement (or
calculation) performed to
produce the Overall
Value. 0 = RMS
1 = RMS peak
2 = RMS pk-to-pk
3 = Peak
4 = Peak-to-peak
5-255 Reserved
7 Get/Set Time Constant REAL The detection time
constant associated with
the output smoothing
filter (for the RMS and DC
meters) or the decay rate
of the peak meters. Must be greater than zero.
For RMS type measurements,
the Time Constant attribute
specifies the 3-db bandwidth for
the digital filtering used to
calculate the Overall Value.
The 3-db bandwidth is roughly
equal to (1/Time Constant). The
greater the value of the Time
Constant, the longer the
response of the measured
Overall Value to change in the
input signal.
For Peak type measurements,
the Time Constant value
specifies the decay rate of the
peak detection meter. The
greater the Time Constant value,
the slower the Peak is decayed.
Table C.39 Overall Measurement Object Instance Attributes
Attr ID
Access
Rule
Name Data Type Description Semantics