VEGA VEGALOG 571 EP (Ex) - Manual (Page 21)

6.2 Adressing of the bus participants
In a Profibus system (DP and PA level) each participant,
whether master of slave, must have an unambiguous address
which can be addressed by the bus system.
As a default setting, VEGA Profibus sensors are shipped with
address setting 126 (= software addressing). Under this
requirement, the EP(Ex) card recognises all VEGA Profibus
sensors by means of their serial number and the addressing is
carried out automatically. The hardware addressing being
usual according to the Profibus standard is deleted.
The hardware addressing must be always carried out for
Profibus PA sensors of other manufacturers.
Note:
After switching on the system, it can take up to two minutes
until the sensors are recognised and the automatic addressing
is finished. The yellow LED flashes also during this period.
In general, the addressing can also be carried out via the
hardware addressing. Depending on the instrument version,
this carried out with VEGA sensors through:
l
DIP address switch
l
MINICOM adjustment module
l
Indicating and adjustment module
Note:
Make sure that no addresses are used twice. If by error, two or
more sensors are assigned to the same address, the system
will react with a bus failure, i.e. the data traffic of the
corresponding sensors is interfered or the sensors are not
recognised.
If an address was already assigned to individual sensors in the
total system via hardware addressing, this addressing re-
mains. The EP(Ex) card recognises already assigned ad-
dresses and positions additional addresses around the
existing ones during the automatic addressing.
Note:
The following addresses are assigned and must not be used in
case of a hardware addressing.
l
0 (fix, preset address of the EP(Ex) module card)
l
123 … 126 (preset addresses for automatic addressing)
Automatic addressing
VEGALOG 571 EP (Ex) - Input card Profibus PA 21
Set up
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