Configuration For Monitoring Other Process Variables; Other Spm Settings - Emerson Rosemount 3051S Series Reference Manual

Advanced Pressure Diagnostics
October 2016
SPM_Active = Enabled with 1st-order HP Filter
After SPM is enabled, it will spend the first five (whatever the SPM_Monitoring_Cycle is set to) minutes in
the learning phase, and then another five minutes in the verification phase. If a steady process is
detected at the end of the verification phase, the SPM will move into the monitoring phase. After 5
minutes in the monitoring phase, SPM will have the current statistical values (e.g. current mean and
standard deviation), and will begin comparing them against the baseline values to determine if an SPM
Alert is detected.
6.3.2

Configuration for monitoring other process variables

Advanced users may wish use SPM to monitor other Fieldbus parameters available within the pressure
transmitter. Examples of such parameters would include module sensor temperature, PID control
output, valve position, or a process measurement from another device on the same Fieldbus segment.
Configuration of SPM for other process variables is similar to what is done for pressure, except that the
Block Tag, Block Type, and Parameter Index parameters are different.
Note that # should be replaced by the number of the SPM block being configured (1, 2, 3, or 4).
SPM#_Block_Tag
The tag of the Fieldbus transducer or function block that contains the parameter to be monitored. Note
that the tag must be entered manually – there is no pull-down menu to select the tag. SPM can also
monitor "out" parameters from other devices. To do this, link the "out" parameter to an input parameter
of a function block that resides in the device, and set up SPM to monitor the input parameter.
SPM#_Block_Type
The type of block which was entered into SPM#_Block_Tag. This could be either a Transducer Block, or
one of the function blocks.
SPM#_Parameter_Index
The parameter (e.g. OUT, PV, FIELD_VAL) of the transducer or function block which you want to monitor.
See "Example configuration of SPM using Function Block" on page 80
DeltaV.
6.3.3

Other SPM settings

Additional information on other SPM settings is shown below:
SPM_Bypass_Verification
If this is set to "Yes", SPM will skip the verification process, and the first mean and standard deviation
from the learning phase will be taken as the baseline mean and standard deviation. By skipping the
verification, the SPM can move into the monitoring phase more quickly. This parameter should only be
set to "Yes" if you are certain that the process is at a steady-state at the time you start the Learning. The
default (and recommended) setting is "No".
SPM_Monitoring_Cycle
This is the length of the sample window over which mean and standard deviation are computed. A
shorter sample window means that the statistical values will respond faster when there are process
changes, but there is also a greater chance of generating false detections. A longer sample window
means that mean and standard deviation will take longer to respond when there is a process change. The
default value is 15 minutes. For most applications, a Monitoring Cycle ranging from 1 to 10 minutes is
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Reference Manual
00809-0200-4801, Rev DA
for an example of this using
Advanced Pressure Diagnostics