Siemens sitrans PROBE LU - Appendix G: Communications Data Map; Directory Structure and Physical Block

7ML19985JB02 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL Page 55
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F: Profile structure
Appendix F: PROFIBUS PA Profile
Structure
PROFIBUS Level Device Design
The device follows the profile block model and is implemented as a Profile 3.0, Rev. 1,
Class B, PA device. Standard profile parameters are used to program the level transducer
block.
Block Model for recording and processing measured values
The functions of the device are divided into blocks for different areas of responsibility.
They can be parameterized by acyclic data transfer via PDM.
The device is implemented with one Physical Block (PB), one Level Transducer Block
(LTB), and two Analog Input Function Blocks (AIFB1 and AIFB2).
All data is viewed from the perspective of the DCS or PLC, so information from the sensor
is an input.
Level Transducer Block (LTB)
The Level Transducer Block carries out adjustments to the sensor, such as level
calibration and volume calibration. It supplies the outputs used by either or both of the
AIFBs.
sensor
sensor
Transducer Block
electronics
temperature
Analog Input
Function Block 2
Analog Input
Function Block 1
PROFIBUS PA
transducer
temperature
sensor