Promag 53 PROFIBUS-DP/-PA 5 Operation
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In an automation control system, the Promag always serves as a slave and can thus,
depending on the type of application, exchange data with one or more masters.
The master can be an automation control system, a PLC or a PC with a PROFIBUS-DP
communications adapter card.
Note:
During the project planning, please remember that the Promag 53 consumes 11 mA.
Caution:
To prevent severe device failures (e.g. short-circuits) from having effect on the
PROFIBUS-PA segment, the IEC 61158-2 interface is equipped with a fuse. If the fuse
blows, the device is permanently disconnected from the bus. In this case, the I/O mod-
ule must be replaced (see Page 123).
Filling function
In contrast to the functionality of a Promag flow meter that does not support the
PROFIBUS, the internal filling function is not integrated in the PROFIBUS-PA devices,
since the device does not have any relay functions.
However, it is still possible to use a filling function, for some applications, using the total-
izer functionality.
Note:
For additional project planning information about the PROFIBUS-PA fieldbus, see
the Operating Instructions BA 198F/00/en “Field communications - PROFIBUS-DP/-PA:
Guides for project planning and commissioning”.
Function blocks
The PROFIBUS uses predefined function blocks to describe the function blocks of a
device and to specify uniform data access.
The function blocks implemented in the fieldbus devices provide information on the
tasks which a device can perform as part of the whole automation strategy.
The following blocks can be implemented in field devices in accordance with Profile 3.0:
• Physical Block:
The Physical Block contains all the device-specific characteristics.
• Transducer Block (transmission block):
One or more transducer blocks contain all the device measurement and device-spe-
cific parameters. The measurement principles (e.g. flow rate and temperature) are
mapped in the Transducer blocks in accordance with the PROFIBUS specification.
• Function Block:
One or more function blocks contain the device's automation functions. We distin-
guish between different function blocks, e.g. Analog Input Block, Analog Output
Block, Totalizer Block, etc. Each of these function blocks is used to process different
applications.
More information can be found in the “Description of Device Functions” manual.
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