Reference Manual
00809-0200-4801, Rev CA
July 2010
Rosemount 3051S
D-2
NEW FUNCTIONALITY PID with Auto Tuner
This block has now been improved to include an auto-tune function.
Advanced Diagnostic Block
The Statistical Process Monitoring with continuous update of mean and
standard deviation at sensor update rate – Previous to Revision 23, SPM
values, Mean and Standard Deviation, could be viewed but not connected to a
control strategy. With the addition of the MAI Block and one extra AI block all
the values can be connected to other Function Blocks, in the field devices or
in the DCS. A rolling average of value is also now available out of the SPM
function. This rolling average is the value of the variable updates during one
macro cycle.
Live software download support
Fieldbus devices can be upgraded, in the field, with an upgraded version of
software. As there are many new diagnostics and functions in development,
this is a very important feature. The process to download the new software
was proprietary in the past. The Foundation has now come out with a
“Common Software Download Specification” specification for software
download from any host. The 3051S complies with the CSDS standard and
categorized as a Class 1 device which means the device remains fully
functional while the new firmware is being downloaded. Other classes (2&3)
require the transmitter to be offline and possibly disruptive to download
software.
Sensor transducer block now complies with Standard with the recent
Pressure Calibration profile
Calibrating a FF transmitter can be a cumbersome task. It requires a
sequence of operations that must be followed properly or the device may not
operate with the proper accuracy. Unfortunately different suppliers took
different approaches on how to get this done and calibrator companies have
been reluctant to make FF calibrators. The Foundation has since developed a
standard for sensor transducer blocks which now comply with. This change
does not affect our calibration methods, it will just make it easier for calibrator
companies to enter the market.
Resource block with Health Index
The Resource Block now publishes the Health Index of the transmitter. The
Health Index is a number from 0 to 100 and is calculated by using the all the
Alarms, Alerts, and block statuses of the transmitter. The number reflects the
transmitter health
NV memory metering
The most common types of Non Volatile memory have a limit for the number
of writes that can be performed in a certain memory position. If this limit is
exceeded, the memory is damaged. In normal operation conditions, the
number of writes during the transmitter life is well below the limit. But some
users may use non conventional configuration techniques that write
continuously to the memory. A typical example is to write the alarm limits
every control cycle. The NV metering algorithm limits the rate of writes,
protecting the memory against excessive writes and alarms if the rate
exceeds the tolerated rate.
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