Endress+Hauser Proline Promass 83 - PROFIBUS PA Cyclic Data Exchange; Block Model; Modules for Cyclic Data Exchange

Proline Promass 83 PROFIBUS DP/PA Commissioning
Endress+Hauser 103
6.8 PROFIBUS PA cyclic data exchange
6.8.1 Block model
The block model illustrated shows which input and output data Promass 83 provides for cyclic data
exchange via PROFIBUS PA.
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Fig. 47: Block model for Promass 83 PROFIBUS PA Profile 3.0
6.8.2 Modules for cyclic data exchange
AI module (Analog Input) - cyclic transmission of process variables
By means of the AI module, the measured variables of the measuring device can be read out
cyclically by the automation system (PROFIBUS master). Here, the cyclic transmission of measured
variables to the automation system is effected in data blocks of 5 bytes. The measured variable is
portrayed in the first four bytes in the form of floating point numbers in accordance with IEEE 754
standard. The fifth byte contains status information pertaining to the measured value which is
implemented in accordance with the PROFIBUS Profile Specification, Version 3.0.
Further information on the device status → Page 121
Data structure of the AI module:
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Analog Input 1
Output value AI
Output value AI
Output value AI
Out value TOTAL
Analog Input 2
Analog Input 3
Analog Input 4
Totalizer 1
Signal
processing
PROFIBUS
PROFILE
Parameter
Manufacturer
specific
Parameter
Control (CONTROL_BLOCK)
Display value (DISPLAY_VALUE)
Transducer
block
Configuration SET, MODE
Totalizer 3
Configuration SET, MODE
Measured variable 1
Measured variable 2
Measured variable 3
Measured variable …
Out value TOTAL
Local
Display
Out value TOTAL
Configuration SET, MODE
Totalizer 2
PROFIBUS PA
Analog Input 5
Analog Input 6
Output value AI
Output value AI
Volume Flow
Corrected Volume Flow
Density
Reference Density
Temperature
Mass Flow
Output value AI
Physical
Block
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Measured variable Status