Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Modbus
RTU
‐
47
‐
PLC
and
drives
integration
Actualization
rate
Be
aware
that
on
a
Modbus
RTU
line
only
one
Modbus
job
is
performed
at
a
time.
That
means
that
the
update
rate
of
the
variables
increases
with
the
number
of
active
Modbus
blocks,
such
as
ACS_COM_MOD_RTU,
ACS_MOD_READ_N_PRM
of
ACS_MOD_WRITE_N_PRM.
The
ACS_COM_MOD_RTU
function
block
automatically
reads
the
actual
data
all
the
time
and
executes
a
write
job
each
time
the
Control
Word
or
the
reference
values
(speed
or
torque)
have
changed.
Other
useful
documentation
CODESYS
Help
(Contents
→
Target
system
→
AC500
/
S500
→
ACS
Drives
Libraries)
User’s
manual
Modbus
Adapter
Module
FMBA
‐
01
[3AFE68586704]
User’s
manual
Modbus
Adapter
Module
RMBA
‐
01
[3AFE
64498851]
Modbus
Protocol
Manual
RS
‐
485
Adapter
Module
FSCA
‐
01
[3AUA0000044530]
User’s
manual
ACS355
drives
[3AUA0000066143]
ACS850
Firmware
Manual
Standard
Control
Program
[3AUA0000045497]
ACQ810
Firmware
Manual
Standard
Pump
Control
Program
[3AUA0000055144]
Firmware
manual
ACS880
primary
control
program
[3AUA0000085967]
ACSM1
Firmware
Manual
Speed
and
Torque
Control
[3AFE68848270]
ACSM1
Firmware
Manual
Motion
Control
[3AFE68848270]
User’s
Manual
ACS550
‐
01
Drives
[3AUA0000001418]
Firmware
Manual
ACS800
Standard
Control
Program
[3AFE64527592]
Revision
Rev Page
(P)
Chap (C)
Description Date
A -
New
document
2013-02-01
B
Update
(C)
Drive
configuration 2013-03-22