Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Modbus
RTU
‐
17
‐
PLC
and
drives
integration
Starting
up
ACS800
drives
with
RMBA
01
Modbus
RTU
adapter
Minimum
required
parameter
settings
(based
on
factory
default
settings)
Parameter
Description
Setting
Comment
98.02
COMM.
MODULE
LINK
STD
MODBUS
Activates
fieldbus
module
98.07
COMM
PROFILE
ABB
DRIVES Communication
profile
“ABB
Drives”
52.01
STATION
NUMBER
[Address]
Modbus
RTU
node
address
of
the
drive
52.02
BAUDRATE
19.2
kbit/s
(example)
Transfer
rate
of
the
link.
Same
baud
rate
must
be
defined
in
the
Modbus
RTU
master.
52.03
PARITY
NONE1STO
PBIT
(example)
Parity
and
stop
bits.
Same
parity
and
stop
bits
must
be
defined
in
the
Modbus
RTU
master.
Drive
power
down
and
power
up
for
the
new
fieldbus
settings
to
take
effect!
10.01
EXT
1
STRT/STP/DIR
COMM.CW
Fieldbus
interface
as
source
for
start
and
stop
11.02
EXT1/EXT2
SELECT
COMM.CW
Fieldbus
interface
as
source
to
switch
to
EXT2
control
location
11.03
EXT
REF1
SELECT
COMM.REF
Fieldbus
interface
as
source
for
speed
reference
16.04
FAULT
RESET
SEL
COMM.CW
Fieldbus
interface
as
source
for
fault
reset
92.02
MAIN
DS
ACT1
102
Actual
speed
value
taken
from
01.02
92.02
MAIN
DS
ACT2
e.g.
105
Actual
value2.
E.g
torque
taken
from
01.05
Optional
parameter
settings
30.18
COMM
FLT
FUNC
[optional]
How
the
drive
reacts
to
a
fieldbus
communication
break.
30.19
MAIN
REF
DS
T
‐
OUT
[optional]
Time
between
communication
break
detection
and
the
selected
action.
(11.05)
EXT
REF1
MAXIMUM
[Scale
max]
Max
speed/frequency
scaling
value
(used
in
function
block/visualization
input
“SPEED_REF_MAX”).
Must
be
less
or
equal
to
drive
parameter
max
speed/frequency.
