Rosemount 644

Reference Manual

00809-0400-4728, Rev AA June 2011

Table 3-5. Sensor Transducer Block STB.SENSOR_ DETAILED_ STATUS messages

STB.SENSOR_DETAILED_STATUS

Description

Invalid Configuration

Wrong sensor connection with wrong sensor

 

type

ASIC RCV Error

The micro detected a chksum or start/stop bit

 

failure with ASIC communication

ASIC TX Error

The A/D ASIC detected a communication error

ASIC Interrupt Error

ASIC interrupts are too fast or slow

Reference Error

Reference resistors are greater than 25% of

 

known value

ASIC Configuration Error

Citadel registers were not written correctly. (Also

 

CALIBRATION_ERR)

Sensor Open

Open sensor detected

Sensor Shorted

Shorted sensor detected

Terminal Temperature Failure

Open PRT detected

Sensor Out of Operating Range

Sensor readings have gone beyond

 

PRIMRY_VALUE_RANGE values

Sensor beyond operating limits

Sensor readings have gone below 2% of lower

 

range or above 6% of upper range of sensor.

Terminal Temperature Out of Operating

PRT readings have gone beyond

Range

SECONDARY_VALUE_RANGE values

Terminal Temperature Beyond Operating

PRT readings have gone below 2% of lower

Limits

range or above 6% of upper range of PRT.

 

(These ranges are calculated and are not the

 

actual range of the PRT which is a PT100 A385)

Sensor Degraded

For RTDs, this is excessive EMF detected. This

 

is thermocouple degradation for thermocouples.

Sensor Error

The user trim has failed due to excessive

 

correction or sensor failure during the trim

 

method

3-20

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Emerson 644 manual Description, Calibrationerr