Emerson Rosemount 3144P - Sensor Transducer Block

144
Reference Manual
00809-0100-4021, Rev JA
Configuration
April 2017
Configuration
Table 4-4. Resource Block RB.FD_EXTENDED_ACTIVE
4.6 Sensor transducer block
Note
When the engineering units of the XD_SCALE in the associated AI Block 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
Damping values may be used for, and should equal, the update rate for Sensor 1, Sensor 2, and sensor
differential. Sensor configuration automatically calculates a damping value. The default damping value is
5 seconds. Damping may be disabled by setting the parameter damping value to 0 seconds. The
maximum damping value allowed is 32 seconds.
An alternate damping value may be entered with the following restrictions.
1. Single sensor configuration
– 50 or 60 Hz line voltage filters have a minimum user-configurable damping value of 0.5 seconds.
2. Dual sensor configuration
– 50 Hz line voltage filter a minimum user-configurable damping value of 0.9 seconds.
– 60 Hz line voltage filter a minimum user-configurable damping value of 0.7 seconds.
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 affects the values passed
to both blocks.
Note
The AI block has a 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.
RB.DETAILED_STATUS Description
Sensor Transducer block error Active when any SENSOR_DETAILED_STATUS bit is on
Manufacturing Block integrity error The manufacturing block size, revision, or checksum is wrong
Hardware/software incompatible
Verify the manufacturing block revision and the hardware revision are
correct/compatible with the software revision
Non-volatile memory integrity error Invalid checksum on a block of NV data
ROM integrity error Invalid application code checksum