Advanced Diagnostic Transducer Block (Adtb) - ABB 266 Operating Instruction

266 Models - FOUNDATION Fieldbus
When a pressure px is applied, the transmitter displays the standardized output value x1 in percent. Due to the present
application the value x2 should be displayed. Enter this new value x2 in the line PRTB_ PARALLEL_SHIFT_PV, the transmitter
calculates the new zero and the new final value and adopts these new settings in the PRTB_PRIMARY_VALUE_RANGE 0%
and PRTB_PRIMARY_VALUE_RANGE 100%

Advanced diagnostic transducer block (ADTB)

Overview
The advanced diagnostic transducer block contains some historic/statistical information and all the parameters related with the PILD
algorithm. The goal of this block is to supervise the device and set diagnostic alarms under transducer abnormal condition to the
control system modifying the pressure transducer block primary value status and raising the proper alarm bit in the
ADTB_BLOCK_ERR and RB_MAINTENANCE_ACTIVE.
Block diagram
Description
The Plugged Impulse Line Detection (PILD) is a function aimed at detecting the blockage of the process connections of the instru-
ment and any type of problem occurring at the sensor internal hydraulic circuit.
The PILD algorithm is executed in two distinct phases:
Training phase:
Selecting ADTB_PILD_COMMAND = TRAIN the training phase starts analyses and learns the process dynamics in term of noises
of the primary signal detected when the process is working at its normal conditions. The Training Phase can take long time depend-
ing by the PILD settings of ADTB_PILD_TRAIN_TIME, ADTB_PILD_RETRIES......, then if the training phase is successfully
completed with good result, ADTB_PILD_TRAINING_OUTPUT = PILD_TRAIN_OK the PILD pass to the second phase of process
monitoring otherwise it is possible read from the ADTB_PILD_TRAINING_OUTPUT the possible cause like:
– Process Instable during training
– Process not available during training
– Not good process condition for training
– Training not done
Monitoring phase:
The algorithms perform a continuous sampling and comparison of the current process noises with what memorized during the train-
ing phase. Differences have been experienced being consequences of something bad in process connections to the sensor like dirty,
ice and so on which tap/plug the pipe/s partially or totally.
Whenever a pipe plugging/tapping is detected, the ADTB_PILD_OUTPUT that was set to NORMAL during the monitoring phase
changes to one of the following conditions:
18 OI/266/FF/ADD-EN Rev. B | 2600T Series Pressure transmitters
PILD_Status
PILD_COMMAND
TRAINING
PILD_DETECTION_TIME
PILD_TRAIN_OUTPUT
PILD_RETRAIN
PILD_TRAIN_TIME
PILD_TRAIN_RETRIES
PILD_SENSITIVITY
PILD_BAND_AUTOTUNING
PILD_BAND_HI
PILD_BAND_LO
NORMAL
PILD_OUTPUT
PILD_DETECTION_TIME
PILD_MAX_PRESSURE_DEV
PILD_AFFECT_PV