Spm Configuration And Operation; Configuration For Monitoring Pressure - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0200-4801, Rev DA
Further detail of the operation of the SPM diagnostic is shown in the
simplified version showing operation using the default values. After configuration, SPM calculates mean
and standard deviation, used in both the learning and the monitoring modes. Once enabled, SPM enters
the learning/verification mode. The baseline mean and standard deviation are calculated over a period of
time controlled by the user (SPM Monitoring Cycle; default is 15 minutes). The status will be "Learning".
A second set of values is calculated and compared to the original set to verify that the measured process
is stable and repeatable. During this period, the status will change to "Verifying". If the process is stable,
the diagnostic will use the last set of values as baseline values and move to "Monitoring" status. If the
process is unstable, the diagnostic will continue to verify until stability is achieved.
In the "Monitoring" mode, new mean and standard deviation values are continuously calculated, with
new values available every few seconds. The mean value is compared to the baseline mean value, and the
standard deviation is compared to the baseline standard deviation value. If either the mean or the
standard deviation has changed more than user-defined sensitivity settings, an alert is generated via
F
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installation.
Note
The SPM diagnostic capability in the Rosemount 3051S F
calculates and detects significant changes in statistical parameters derived from the input process
variable. These statistical parameters relate to the variability of and the noise signals present in the
process variable. It is difficult to predict specifically which noise sources may be present in a given
measurement or control application, the specific influence of those noise sources on the statistical
parameters, and the expected changes in the noise sources at any time. Therefore, Emerson cannot
absolutely warrant or guarantee that SPM will accurately detect each specific condition under all
circumstances.
6.3

SPM configuration and operation

The following section describes the process of configuring and using the SPM diagnostic.
6.3.1

Configuration for monitoring pressure

Most Advanced Diagnostics Applications require using the device's pressure measurement as the SPM
input. To configure the first SPM Block (SPM1) to monitor the pressure set the following parameters:
SPM1_Block_Tag = TRANSDUCER
Note
By default, as shipped from the factory, the tag of the sensor transducer block is "TRANSDUCER". DeltaV
does not change the transducer block tags when the device is installed and commissioned. However, it is
possible that other Fieldbus host systems may change the transducer block tags. If this happens,
SPM#_Block_Tag must be set to whatever tag was assigned by the host.
SPM1_Block_Type = TRANSDUCER Block
SPM1_Parameter_Index = Pressure (inH
SPM1_User_Command = Learn
(optional) SPM_Monitoring_Cycle = [1 – 5] minutes (see
(optional) SPM_Bypass_Verification = [Yes/No] (see
Apply all of these above changes to the device. Finally, set
Advanced Pressure Diagnostics
Fieldbus. The alert may indicate a change in the process, equipment, or transmitter
Advanced Pressure Diagnostics
OUNDATION
O @ 68 °F)
2
"Other SPM settings" on page
page 74)
October 2016
Figure 6-4 flowchart. This is a
Fieldbus Pressure Transmitter
74)
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