R60723.0002
–
Index
6c
EN
‐
page
51
/
62
Continutation
“
Parameter
setting”
SERIAL
INIT
Not
valid
for
Modbus
communication
SERIAL
PROTOCOL
Not
valid
for
Modbus
communication
SERIAL
TIMER
(S)
Not
valid
for
Modbus
communication
SERIAL
VALUE
Not
valid
for
Modbus
communication
MODBUS
This
parameter
enables
the
Modbus
protocol
and
determines
the
Modbus
address.
0
Do
not
use
for
Modbus
protocol
(Modbus
disabled)
1
…
247
Modbus
enabled:
Serial
interface
is
using
Modbus
RTU
protocol
The
number
set
here
determines
the
Modbus
node
address.
6.2.2
Modbus
Communication
The
following
Modbus
functions
are
available:
Read
Holding
Registers
and
Write
Multiple
Registers
With
the
functions
“Read
Holding
Registers”
and
“Write
Multiple
Registers”
it
is
possible
to
access
all
registers
of
the
device.
All
variables
(actual
data)
and
status
registers
are
mapped
to
Modbus
Holding
Registers.
However,
as
all
registers
of
the
device
are
32
bit
registers
but
Modbus
Holding
registers
are
only
16
bit
registers,
each
register
of
the
device
requires
two
Holding
registers.
(For
this
reason
the
use
of
Modbus
function
“Write
Single
Register”
is
not
possible.)
It
is
only
possible
to
access
to
one
single
register
of
the
57xT
device
by
each
read
or
write
operation,
therefore
the
“Quantity
(or
number)
of
registers”
in
the
Modbus
request
must
always
be
2.
Access
to
parameters
Holding
Register
0x0000
/
0x0001
hex
and
following
allow
access
to
the
device
parameters.
The
holding
register
numbers
for
a
certain
parameter
can
be
calculated
by
the
parameter
#
that
can
be
found
in
the
parameter
table
in
the
57xT
device
manual:
Holding
Register
low
=
(parameter
#)
x
2
Holding
Register
high
=
(parameter
#)
x
2
+
1
Example:
Access
to
parameter
#
51
“PRESELECTION
1”
by
Holding
Register
0x0066
and
0x0067
hex.
