ABB DCS550 Series, Manual

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102
Communication
3ADW000379R0501 DCS550 Manual e e
Modbus (RTU) communication with fieldbus adapter RMBA-01
General
This chapter gives additional information using the Modbus adapter RMBA-01 together with the DCS550.
RMBA-01 - DCS550
The Modbus communication with the drive requires the option RMBA-01. The protocol Modbus RTU (Remote
Terminal Unit using serial communication) is supported.
Related documentation
User’s Manual Modbus Adapter Module RMBA-01. The quoted page numbers correspond to the User’s
Manual.
Mechanical and electrical installation
If not already done so insert RMBA-01 into a slot of the drive. Slot 1 has to be used, if the Modbus should
control the drive.
Drive configuration
The Modbus adapter is activated by means of CommModule (98.02)
and ModBusModule2 (98.08).
The
serial communication parameters of the RMBA-01 adapter have to be set by means of group 52. Up to 10
data words in each direction are possible.
Parameter setting example controlling a drive
In data set mode (cyclic communication), the drive will be controlled from the overriding control using the
Modbus. Up to 10 data words in each direction are possible. The following table shows the parameter settings.
Drive parameters
Settings Comments
CommandSel (10.01) MainCtrlWord
Ref1Sel (11.03) SpeedRef2301
CommModule (98.02) Modbus
StationNumber (52.01) 1, …, 247 desired station number
BaudRate (52.02) 5 5 = 9600 Baud
Parity (52.03) 4 4 = Even
DsetXVal1 (90.01) 701, default MainCtrlWord (7.01);
output data word 1 (control word) 1
st
data word from
overriding control to drive
(40001 => data word 1.1)
DsetXVal2 (90.02) 2301, default SpeedRef (23.01);
output data word 2 (speed reference) 2
nd
data word from
overriding control to drive
(40002 => data word 1.2)
DsetXVal3 (90.03) 2501, default TorqRefA (25.01);
output data word 3 (torque reference) 3
rd
data word from
overriding control to drive
(40003 => data word 1.3)
up to, …,
DsetXplus6Val1 (90.10)
0, default not connected;
output data word 10 (not connected) 10
th
data word from
overriding control to drive
(40019 <= data word 7.1)
DsetXplus1Val1 (92.01) 801, default MainStatWord (8.01);
input data word 1 (status word) 1
st
data word from drive to
overriding control
(40004 <= data word 2.1)