Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Modbus
RTU
‐
41
‐
PLC
and
drives
integration
Example
Write
drive
data
with
“ACS_MOD_WRITE_N_PRM”
Values
are
written
to
Modbus
register
addresses
according
to
user
choice.
No
additional
parameter
settings
in
the
drive
are
necessary.
Create
a
new
network
in
the
same
program
(POU)
and
add
the
block
“ACS_MOD_WRITE_N_PRM”
(1).
Set
function
block
inputs
according
to:
EN
is
connected
to
an
“execute”
variable
of
type
“BOOL”
(1).
At
rising
edge
the
variable
is
written
once.
PRIO
=
Left
unconnected.
NVAR
=
Number
of
parameters
to
write
(3)
→
2
parameters
will
be
written
in
this
example.
PRM_NUM
=
Start
address
of
parameters
to
be
written
(4)
→
parameters
12.02
and
12.03
will
be
written
in
this
example.
DATA
is
connected
via
an
“ADR”
block
to
a
new
variable
(5)
of
type
“ARRAY
[1..X]
OF
INT”
according
to
instructions
for
the
“ACS_MOD_READ_N_PRM”
block.
DRIVE_DATA
=
The
same
variable
that
is
connected
to
“ACS_COM_MOD_RTU”
→
“DRIVE_DATA”
(6).
