Reference Manual
00809-0100-4793, Rev CA
August 2004
D-5
Rosemount 8742C
TRANSDUCER BLOCK
DIAGNOSTICS
In addition to the BLOCK_ERR and XD_ERROR parameters, more detailed
information on the measurement status can be obtained via
DETAILED_STATUS. Table D-5 lists the potential errors and the possible
corrective actions for the given values. Reset the transmitter by cycling power
and then, if the error persists, perform the corrective action as described in
Table D-5. More detailed and descriptive corrective actions are listed in
Section 4: Operation and Maintenance and Section 5: Troubleshooting.
Table D-5.
TB_DETAILED_STATUS
Descriptions and Corrective
Actions
MODES
The transducer block supports two modes of operation as defined by the
MODE_BLK parameter:
•
Automatic (Auto)
—The channel outputs reflect the analog input
measurement.
•
Out of Service (O/S)
—The block is not processed. Channel outputs
are not updated and the status is set to
BAD: OUT OF SERVICE
for
each channel. The BLOCK_ERR parameter shows
OUT OF SERVICE
.
In this mode, you can make changes to all configurable parameters.
The target mode of a block may be restricted to one or more of the
supported modes.
Alarm Detection
Alarms are not generated by the transducer block. By correctly handling the
status of the channel values, the down stream block (AI) will generate the
necessary alarms for the measurement. The error that generated this alarm
can be determined by looking at BLOCK_ERR and XD_ERROR.
Value
Name and Description
Corrective Action
0x00000001
DSP hardware not compatible
with software
Send to service center
(1)
(1) See Section 5: Troubleshooting for detailed instructions on how to return products to an
authorized service center or factory.
0x00000002
Electronics failure
Replace the electronics board
stack
0x00000004
Coil drive open circuit
Perform flowtube electrical
resistance checks
0x00000008
Empty Pipe Detected
Verify flowtube is full
0x00000010
Calibration failure
Cycle transmitter power to clear
message
0x00000020
Auto Zero failure
Repeat Auto Zero process
0x00000040
Sensor high limit exceeded
Lower the process flowrate
0x00000080
Primary value range exceeded
Lower the process flowrate
0x00000100
Electrode signal fault
Remove moisture from terminal
block
0x00000200
Reverse flow detected
Verify flowtube is not installed
backwards
0x00000800
Electronics trim in progress
Status message –
no corrective action
0x00001000
Auto zero trim in progress
Status message –
no corrective action
0x00002000
High Process Noise
Increase the coil drive frequency to
37.5 Hz
0x00008000
Grounding/Wiring Fault
Connect process grounding
0x00020000
Learn Empty Pipe in Progress
Status message –
no corrective action
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