Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Modbus
RTU
‐
29
‐
PLC
and
drives
integration
Double
‐
click
“Global_Variables”
in
the
“Resources”
tab
(1)
and
create
a
global
variable
for
the
Modbus
token
handling
of
type
“ACS_MOD_TOKEN_TYPE”
(2).
This
variable
will
be
used
for
connecting
the
drive
to
a
certain
Modbus
line.
Note!
This
variable
should
be
global
(One
single
variable
used
for
all
drives).
Open
the
program
again
from
the
“POUs”
tab
and
connect
the
function
block
inputs
and
outputs
according
to
your
needs.
In
the
example
below,
the
block
will
always
be
enabled,
COM
port
1
of
the
PLC
is
used,
the
drive
has
Modbus
node
number
1,
default
timeout
1000
ms
is
used,
drive
type
is
ACS355,
no
extra
parameters
besides
Status
word
and
Actual
speed/torque
are
read
from
the
drive.
The
variables
declared
between
“VAR”
and
“END_VAR”
in
the
picture
below
are
local
variables
and
can
only
be
accessed
from
the
actual
program
(PRG)
or
from
the
Visualization
objects
(see
chapter
“Visualizations”).
Tip!
Click
inside
the
name
of
the
function
block
and
press
F1
to
open
the
description
of
the
block
in
the
online
help.
Содержание ACS310
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