Reference Manual

00809-0400-4728, Rev AA June 2011

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

 

Index

 

Notes on how changing this parameter

Parameter

Number

Description

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,

No effect.

 

 

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.

 

BLOCK_ERR

06

This parameter reflects the error status

No effect.

 

 

associated with the hardware or software

 

 

 

components associated with a block. It is a bit

 

 

 

string, so that multiple errors may be shown.

 

CAL_MIN_SPAN

18

The minimum calibration span value allowed.

No effect.

 

 

This minimum span information is necessary to

 

 

 

ensure when calibration is done, the two

 

 

 

calibrated points are not too close together.

 

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

Device must be calibrated using the appropriate

 

 

index for the calibration values.

engineering units.

COLLECTION_DIRECTORY

12

A directory that specifies the number, starting

No effect.

 

 

indices, and DD Item ID's of the data collections

 

 

 

in each transducer.

 

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

Assigns the device mode.

 

 

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

 

CALIBRATOR_MODE

33

Indicates the type of sensor module.

 

PRIMARY_VALUE

14

The measured value and status available to the

No effect.

 

 

function block.

 

C-5

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Emerson 644 manual Sensor Transducer Block, Parameters Descriptions, Description Effects transmitter operation