Endress+Hauser prowirl 77 - Acyclic Data Transfer and Operation

5.5 Acyclic Data Transfer
The block model of Prowirl 77
With acyclic access, the control system or an operating program is able to control the
parameters of the blocks listed below.
The Prowirl 77 software contains four different funciton blocks which correspond to
the PROFIBUS-PA profile definitions:
• Physical block
In the Physical block there is device specific information such as tag number,
software version etc.
• Transducer block for flow (Flow block)
The Transducer block contains the meter data such as calibration factor or nominal
diameter.
• AI block for flow (AI = analog input)
The AI block contains the basic automation functions.
This universal function block provides the control system with all parameters for the
processing of the flow measurement variable (filtering, scaling, mode and status
handling).
• Totalizer function block
The totalizer block allows direct access to totalizer parameters by the control
system.
PB
Physical-
Block
TB
Tra nsdu cer-
Block
Totalizer
Function-
Block
AI
Function-
Block
Prowirl 77
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PROFIBUS-PA
Fig. 14
Block model of Prowirl 77
PROFIBUS-PA
Prowirl 77 PROFIBUS-PA 5 Communication
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