Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 146 / 168

144 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Appendix B CIP Objects
Instance Attributes
Table 71 - Overall Measurement Object Instance Attributes
Attribute
ID Access Rule Name Data Type Description Semantics
3 Get Overall Value REAL Measured value The output value of the measurement that the
Overall Measurement Object performs on the input
signal. The result of the measurement process that is
specified by Measurement is converted to the units
specified by Data Units to produce the Overall Value.
4 Get Status BOOL Indicates if a fault or alarm has occurred. 0 = Operating without alarms or faults.
1 = Alarm or fault condition exists. The Overall Value
attribute does not always match the actual field
value.
5 Get Data Units ENGUNIT The units context of the Overall Value
attribute.
The Output Data Units attribute for the Channel
Object determine the setting. (see page 140 ).
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 Time Constant REAL The detection time constant that is
associated with the output smoothing filter
(for the RMS and DC meters) or the decay
rate of the peak meters.
This setting is based on the Low Frequency Cutoff
(Channel object) and Measurement (attribute 6).
If Measurement is set to 3 or 4, the Overall Time
Constant is 1.5 seconds.
If Measurement is set to 0, 1, or 2, this table shows
the Time Constant.
8 Get Damping Factor REAL The damping factor that is associated with
output smoothing filter for the RMS and DC
meters (not used with peak meters).
1.0
9 Get/Set Overall Filter USINT Overall filter type that is applied to the
input signal before the measurement is
performed. 0 = None
1 = Low Pass Filter
2…255 Reserved
10 Get/Set Low Pass Corner
Frequency UINT The corner frequency of the low pass filter. 100…20,000 Hz
Low
Frequency
Cutoff Overall
Time
Constant
0.2 Hz 0.8
1 Hz 0.16
5 Hz 0.045
10 Hz 0.045
40 Hz 0.045