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Reference Manual
00809-0100-4021, Rev GC
Section 4: FOUNDATION fieldbus Configuration
April 2014
Foundation™ fieldbus configuration
Glossary of AMS Device Manager terms
Trigger Level: Threshold resistance value for the thermocouple loop. The Trigger Level may be
set for 2, 3, or 4 x Baseline or the default of 5000 Ohms. If the resistance of the thermocouple
loop surpasses the Trigger Level, a PlantWeb maintenance alert will be generated.
Resistance: This is the existing resistance reading of the thermocouple loop.
Baseline Value: The resistance of the thermocouple loop obtained after installation, or after
resetting the Baseline value. The Trigger Level may be calculated from the Baseline Value.
Trigger Setting: May be set for 2, 3, or 4 x Baseline or the default of 5000 Ohms.
Sensor 1 Degraded: A PlantWeb maintenance alert generated when the Thermocouple
Degradation Diagnostic is enabled and the resistance in the loop exceeds the user-configured
Trigger Level. This alert indicates maintenance may be necessary or that the thermocouple may
have degraded.
Configure: Launches a method so the user can enable or disable the Thermocouple
Degradation Diagnostic, select the Trigger Level, and automatically calculates the Baseline value
(which may take several seconds).
Reset Baseline Value: Launches a method to recalculate the Baseline value (which may take
several seconds).
Enabled: Indicates when the Thermocouple Degradation Diagnostic is enabled for the sensor.
Learning: Indicates when checked that the Baseline Value is being calculated.
Licensed: The check box indicates if Thermocouple Degradation Diagnostic is available for the
specific transmitter.
Minimum and maximum temperature tracking
Minimum and Maximum Temperature Tracking (Min/Max Tracking) can record lifetime
minimum and maximum temperatures with date and time stamps on Rosemount 3144P
Temperature Transmitters. This feature records values for Sensor 1, Sensor 2, differential and
terminal (body) temperatures. Min/Max Tracking only records temperature maxima and minima
obtained since the last reset, and is not a logging function.
To track maximum and minimum temperatures, Min/Max Tracking must be enabled in the
transducer function block using a field communicator, AMS Device Manager, or other
communicator. While enabled, this feature allows for a reset of information at any time, and all
variables can be reset simultaneously. Additionally, Sensor 1, Sensor 2, differential, and terminal
(body) temperature minimum and maximum values may be reset individually. Once a particular
field has been reset, the previous values are overwritten.
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