Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Modbus
RTU
‐
18
‐
PLC
and
drives
integration
Starting
up
ACS850,
ACQ810
drives
with
embedded
Modbus
RTU
Minimum
required
parameter
settings
(based
on
factory
default
settings)
Parameter
Description
Setting
Comment
50.15
Fb
cw
used
P.02.36
Selects
the
address
of
the
fieldbus
Control
Word
in
use.
58.01
Protocol
ena
sel
Modbus
RTU
Initializes
embedded
fieldbus
communication.
Drive
‐
to
‐
drive
link
operation
(parameter
group
57)
is
automatically
disabled.
58.03
Node
address
[Address]
Modbus
RTU
node
address
of
the
drive
58.04
Baud
rate
19.2
kbit/s
(example)
Transfer
rate
of
the
link.
Same
baud
rate
must
be
defined
in
the
Modbus
RTU
master.
58.05
Parity
8
none
1
(example)
Parity
and
stop
bits.
Same
parity
and
stop
bits
must
be
defined
in
the
Modbus
RTU
master.
58.06
Control
profile
ABB
Classic
Communication
profile
“ABB
Drives”
58.10
Refresh
settings
[optional]
Refreshes
the
settings
of
parameters
58.01…58.09.
10.01
Ext1
start
func
FB
Fieldbus
interface
as
source
for
start
and
stop
12.01
EXT1/EXT2
SEL
P.02.36
bit
15
Fieldbus
interface
as
source
to
switch
to
EXT2
control
location
21.01
Speed
ref1
sel
EFB
ref1
Fieldbus
interface
as
source
for
speed
reference
10.10
Fault
reset
sel
P.02.36
bit
8
Fieldbus
interface
as
source
for
fault
reset
Optional
parameter
settings
58.07
Comm
loss
t
out
[optional]
Defines
the
timeout
limit
for
the
EFB
communication
monitoring.
58.08
Comm
loss
mode
None
or
Any
Message
Enables/disables
EFB
communication
loss
monitoring
and
defines
the
means
for
resetting
the
counter
of
the
communication
loss
delay.
58.09
Comm
loss
action
[optional]
Defines
the
drive
operation
after
the
EFB
communication
loss
monitoring
awakes.
58.10
Refresh
settings
[optional]
Refreshes
the
settings
of
parameters
58.01…58.09.
(19.01)
Speed
scaling
[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.
