Table 8-3: Transducer Block Parameter Descriptions
(continued)
Parameter mnemonic Valid range Units Description
COMB_DELTA_RESISTANCE N/A Ohms The raw value of the
combustibles level input.
This is the difference
between the active and
reference RTDs.
COMB_FAILED_CONSTANT N/A ppm This is the constant value
calculated from the last
failed combustibles
calculation.
COMB_FAILED_SLOPE N/A ppm/Ohms This is the slope value
calculated from the last
failed combustibles
calibration.
COMB_HTR_DUTYCYCLE N/A N/A Combustibles heater
duty cycle.
COMB_PERCENT_OF_RANGE N/A % The percent of range of
the current combustibles
reading.
COMB_PREVIOUS_CONSTAN
T
N/A ppm The combustibles
calibration constant from
the previous good
calibration.
COMB_PREVIOUS_SLOPE N/A ppm/Ohms The combustibles
calibration slope from
the previous good
calibration.
COMB_PRIMARY_VALUE N/A N/A The value and status of
the combustibles
concentration reading.
COMB_PRIMARY_VALUE_
RANGE
N/A N/A The high and low range
limit values, the
engineering units code,
and the number of digits
to the right of the
decimal point for the
combustibles reading.
COMB_PRIMARY_VALUE_TY
PE
N/A N/A See FF-903, Section 3.3
COMB_REFERENCE_OHMS N/A Ohms The raw value of the
combustibles reference
input.
FOUNDATION
™
Fieldbus Manual
December 2022 00809-0500-4880
132 Emerson.com/Rosemount
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