PROline Prosonic Flow 93 PROFIBUS-DP/-PA 5 Operation
Endress+Hauser 63
General information
Prosonic Flow 93 can be equipped with a PROFIBUS-DP interface (decentral periphery)
in accordance with the fieldbus standard PROFIBUS-DP (EN 50170 Volume 2) which
utilises the RS485 transmission technology.
As a consequence, Prosonic Flow 93 can exchange data with automation systems
which satisfy this standard. The integration in a control system must be in accordance
with the PROFIBUS-PA Profile 3.0 Specifications.
Data transmission rate
Prosonic Flow 93's maximum PROFIBUS-DP data transmission rate is 12 MBaud.
!
Note!
The device is able to automatically determine the data transmission rate. We
recommend that, before you load a new data transmission rate, you reset the device:
– Via the function: SUPERVISION
SYSTEM OPERATION SYSTEM RESET
– By switching the supply voltage off and back on again
Information about bus terminators (terminating resistors) can be found on Page 42.
Communications partner
In a control system, Prosonic Flow 93 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 a process control system, a PLC or a PC with a PROFIBUS-DP
communications adapter card.
!
Note!
For additional project planning information on the PROFIBUS-DP fieldbus, see the
Operating Instructions BA 198F/00/en “Field Communication - PROFIBUS-DP/-PA:
Guidelines 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 device-specific characteristics.
Transducer Block (transmission block):
One or more Transducer Blocks contain all the device's measurement-related and
device-specific parameters. In the Transducer Blocks, the measurement principles
(e.g. flow rate and temperature) are mapped in accordance with the PROFIBUS
Profile 3.0.
Function block:
One or more function blocks contain the device's automation functions.
We distinguish 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.
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