Siemens LR 460 User Manual
7ML19985JM01
SITRANS LR 460 (HART) – INSTRUCTION MANUAL
Page F-91
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HART
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.
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.
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:
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
• to the HART digital channel, as the HART Primary Variable. This can only be
viewed via the HART digital channel.
AIFB2
The output of Analog Input Function Block 2 supplies the measured value and associated
status information as a digital signal to the HART digital channel, as the HART Secondary
Variable. This can only be viewed via the HART digital channel.
The output of Analog Input Function Block 2 supplies the measured value and associated
status information as a digital signal to the HART digital channel, as the HART Secondary
Variable. This can only be viewed via the HART digital channel.
Description of the blocks
For a detailed description of how the Level Transducer Block and Analog Input Function
Blocks process information, see
Blocks process information, see