Level Transducer Block (Ltb) - Siemens SITRANS LR460 Operating Instructions Manual

HART information structure
C.4 Level transducer block (LTB)
C.4

Level transducer block (LTB)

Level transducer block (LTB)
The Level Transducer Block carries out adjustments to the sensor, such as level calibration. It
supplies the output (Primary Value/PV, or Secondary Value 1/SV!, or Secondary Value 2/SV2)
which is utilized by either or both of the AIFBs.
Analog input function blocks AIFB1 and AIFB2
The two AIFBs are identical, but completely independent of each other. They utilize the
output from the Level Transducer Block. You set parameters for each AIFB in order for it to
apply any required quality checks, scaling, and Fail-safe Operation selections.
AIFB1
The output of Analog Input Function Block 1 supplies the measured value and associated
status information as a digital signal to two communication channels:
• via the mA Output Block to a 4 to 20 mA channel
• to the HART digital channel, as the HART Primary Variable. This can only be viewed via the
HART digital channel.
144
Total Sensor Operating Time
Remaining Sensor Lifetime
Maintenance Required Limit
Maintenance Demanded Limit
Maintenance Alert Activation
Total Expected Sensor Life
Service Interval
Time Lapsed Since Last Service
Maintenance Required Limit
Maintenance Demanded Limit
Maintenance Alert Activation
Total Service Interval
Calibration Interval
Time Lapsed Since Last Calibration Maintenance Required Limit
Maintenance Demanded Limit
Maintenance Alert Activation
Total Calibration Interval
Operating Instructions, 10/2021, A5E42035355-AB
SITRANS LR460