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Reference Manual
00809-0400-4728, Rev AA
June 2011
C-5
Rosemount 644
SENSOR TRANSDUCER
BLOCK
The transducer block contains the actual measurement data, including a
pressure and temperature reading. The transducer block includes information
about sensor type, engineering units, linearization, reranging, temperature
compensation, and diagnostics.
Parameters and
Descriptions
Table C-2. Sensor Transducer Block Parameters and Descriptions
Parameter
Index
Number
Description
Notes on how changing this parameter
effects transmitter operation.
ALERT_KEY 04 The identification number of the plant unit. No effect on operation of transmitter but may
affect the way alerts are sorted on the host end.
BLOCK_ALM 08 The block alarm is used for all configuration,
hardware, connection failure or system
problems in the block. The cause of the alert is
entered in the subcode field. The first alert to
become active will set the Active status in the
Status parameter. As soon as the Unreported
status is cleared by the alert reporting task,
another block alert may be reported without
clearing the Active status, if the subcode has
changed.
No effect.
BLOCK_ERR 06 This parameter reflects the error status
associated with the hardware or software
components associated with a block. It is a bit
string, so that multiple errors may be shown.
No effect.
CAL_MIN_SPAN 18 The minimum calibration span value allowed.
This minimum span information is necessary to
ensure when calibration is done, the two
calibrated points are not too close together.
No effect.
CAL_POINT_HI 16 The highest calibrated value. Assigns a value to the calibration high point.
CAL_POINT_LO 17 The lowest calibrated value. Assigns a value to the calibration low point.
CAL_UNIT 19 The device description engineering units code
index for the calibration values.
Device must be calibrated using the appropriate
engineering units.
COLLECTION_DIRECTORY 12 A directory that specifies the number, starting
indices, and DD Item ID's of the data collections
in each transducer.
No effect.
ASIC_REJECTION 42 Indicates the type of material that the drain
vents on the flange are made of. See Drain Vent
Material Codes.
FACTORY_CAL_RECALL 32 Recalls the sensor calibration set at the factory.
USER_2W_OFFSET 36 Indicates the type of material that the flange is
made of. See Flange Material Codes.
INTER_DETECT_THRESH 35 Indicates the type of flange that is attached to
the device. See Flange Type Codes.
MODE_BLK 05 The actual, target, permitted, and normal modes
of the block.
Target: The mode to “go to”
Actual: The mode the “block is currently in”
Permitted: Allowed modes that target may take
on
Normal: Most common mode for target
Assigns the device mode.
CALIBRATOR_MODE 33 Indicates the type of sensor module.
PRIMARY_VALUE 14 The measured value and status available to the
function block.
No effect.