Technical Manual
Absolute Single/Multiturn Encoders
Profibus
R.000.000
3-5 of 22
2
2
Start-up
Start-up
Before
a
PROFIBUS
‐
DP
system
can
be
started
up,
unique
bus
addresses
must
be
assigned
to
all
connected
stations,
including
the
Master
system.
This
is
the
only
way
to
ensure
unambiguous
addressing
on
the
bus.
As
an
option,
the
station
addresses
can
also
be
assigned
via
the
bus.
The
physical
system
settings
are
made
using
the
parameter
set
of
the
Master.
In
addition
to
the
bus
address
of
the
Master,
this
set
includes,
for
example,
the
baud
rate,
the
time
‐
out
delays
and
the
number
of
repetitions
of
the
transmission.
Along
with
the
Master
parameter
set,
a
Slave
data
set
must
be
saved
for
each
Slave
to
be
activated.
A
data
set
contains
the
parameter
assignment
and
configuration
data
of
the
Slave
and
the
address
indicator
for
the
logical
storage
of
the
I/O
data.
If
the
parameter
sets
are
present,
then
either
at
the
request
of
the
user
or
automatically
the
Master
system
begins
to
start
the
Slaves
up,
one
after
the
other.
The
first
so
‐
called
diagnostic
cycles
are
able
to
show,
which
slave
is
present
on
the
bus.
Only
those
Slaves,
which
sent
a
correct
feedback
during
the
diagnostic
cycle,
will
subsequently
be
parameterized
in
the
parameter
cycles
with
the
corresponding
data
stored
in
the
Master.
If
this
has
been
correctly
carried
out,
then
configuration
cycles
follow,
during
which
a
comparison
is
made
between
the
required
configuration
data
stored
in
the
Master
and
the
actual
configuration
data
of
the
Slave.
After
the
last
diagnostic
cycle,
each
Slave
for
which
no
error
was
detected
during
the
comparison
is
ready
for
operation.
Each
of
these
Slaves
is
then
integrated
automatically
by
the
Master
in
the
operating
data
transfer.
For
diagnostic
purposes,
the
Master
provides
a
diagnostic
buffer
for
each
Slave,
which
can
be
read
by
the
user
for
other
purposes.
To
simplify
the
diagnostics,
a
general
diagnostic
field
is
kept
simultaneously,
which
shows
bitwise
whether
a
Slave
has
diagnostic
data
ready
or
not.
3
3
General
wiring
instructions
General wiring instructions
Installation
instructions
for
RS
‐
485
All
devices
are
connected
within
a
bus
structure
(line).
Up
to
32
stations
(Master
or
Slaves)
can
be
linked
together
in
one
segment.
The
bus
is
terminated
at
the
beginning
and
at
the
end
of
each
segment
by
an
active
bus
termination
(termination
resistors).
To
ensure
disturbance
‐
free
operation
both
bus
terminations
must
always
remain
powered.
The
bus
termination
is
provided
ready
‐
to
‐
activate
in
the
device
of
in
the
connector.
When
there
are
more
than
32
stations
on
the
bus,
repeaters
must
be
inserted
to
connect
the
individual
bus
segments.
The
maximum
line
length
is
dependent
on
the
transmission
speed
–
refer
to
Table
2.
The
line
length
indicated
can
be
increased
using
repeaters.
It
is
recommended
not
to
connect
more
than
3
repeaters
in
succession.
Baudrate
(kBit/s)
9.6
19.2
93.75
187.5
500
1500
12000
Range/Segment
1200
m
1200
m
1200
m
1000
m
400
m
200
m
100
m
Table
2:
Range
depending
on
the
transmission
speed
for
A
‐
type
cable
