Emerson Rosemount 644 FOUNDATION, Reference Manual

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13
Reference Manual
00809-0400-4728, Rev CA
Configuration
September 2018
Configuration
2.4.2 Sensor transducer block
Note
When the engineering units of the XD_SCALE are selected, the engineering units in the Transducer Block
change to the same units. This is the only way to change the engineering units in the sensor transducer
block.
Damping
The damping parameter in the Transducer Block may be used to filter measurement noise. By increasing
the damping time, the transmitter will have a slower response time, but will decrease the amount of
process noise that is translated to the transducer block primary value. Because both the LCD display and
AI block get input from the transducer block, adjusting the damping parameter will effect both blocks.
Note
The AI block has it's own filtering parameter called PV_FTIME. For simplicity, it is better to do filtering in
the transducer block as damping will be applied to primary value on every sensor update. If filtering is
done in AI block, damping will be applied to output every macrocycle. The LCD display will display value
from transducer block.
Table 2-1. RB.RECOMMENDED_ACTION
Alarm type
Failed/Maint/Advise
Active Event
Recommended action
text string
Plan
tw
eb aler
ts
None None No action required
Advisory NV Writes Deferred
Non-volatile writes have been deferred, leave the
device powered until the advisory goes away
Maintenance
Configuration Error Re-write the Sensor Configuration
Primary Value Degraded
Confirm the operating range of the applied sensor
and/or verify the sensor connection and device
environment
Calibration Error Retrim the device
Secondary Value Degraded
Verify the ambient temperature is within operating
limits
Failed
Electronics Failure Replace the Device
HW / SW Incompatible
Verify the Hardware Revision is compatible with the
Software Revision
NV Memory Failure
Reset the device then download the Device
Configuration
Primary Value Failure
Verify the instrument process is within the Sensor
range and / or confirm sensor configuration and
wiring.
Secondary Value Failure
Verify the ambient temperature is within operating
limits