FMC Corporation - Talstar 80 - Handbuch (Seite 53)

Proline Promass 80 PROFIBUS PA Commissioning
53
6.6 Cyclic data transmission PROFIBUS PA
Below is a description of the cyclic data transmission when using the Promass 80 GSD file (complete
device functionality).
6.6.1 Block model
The block model illustrated shows which input and output data Promass 80 provides for cyclic data
exchange via PROFIBUS PA.
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Fig. 32: Block model for Promass 80 PROFIBUS PA Profile 3.0
6.6.2 Modules for cyclic data transmission
The measuring device is a so-called modular PROFIBUS slave. In contrast to a compact slave, the
structure of a modular slave is variable - it consists of several individual modules. In the GSD file,
the individual modules (input and output data) are described with their individual properties. The
modules are permanently assigned to the slots, i.e. the sequence or arrangement of the modules
must be observed when configuring the modules (see following table). Gaps between configured
modules have to be assigned the EMPTY_MODULE module.
To optimize the data throughput rate of the PROFIBUS network, it is recommended to only
configure modules that are processed in the PROFIBUS master system.
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E + -
XXX.XXX.XX
PROFIBUS
P
A
Analog Input 1
Output value AI
Output value AI
Output value AI
Output value AI
Analog Input 2
Analog Input 3
Analog Input 4
Measured variable 1
Measured variable 2
Measured variable 3
Measured variable …
Signal
processing
PROFIBUS
PROFILE
Parameter
Manufacturer
specific
Parameter
Control (CONTROL_BLOCK)
Display value (DISPLAY_VALUE)
Transducer
block
Totalizer
Configuration SETTOT, MODETOT
Measured variable 1
Measured variable 2
Measured variable 3
Measured variable …
Out value TOTAL
Local
Display
Physical
Block