ABB ACS280 Firmware Manual page 352

Fieldbus control through the embedded fieldbus interface (EFB)
352
System overview
The drive can be connected to an external control system through a
communication link using the embedded fieldbus interface.
Modbus
The embedded fieldbus interface supports the Modbus RTU protocol. The drive
control program can handle 10 Modbus registers in a 10-millisecond time level.
For example, if the drive receives a request to read 20 registers, it will start its
response within 22 ms of receiving the request – 20 ms for processing the
request and 2 ms overhead for handling the bus. The actual response time
depends on other factors as well, such as the baud rate (a parameter setting in
the drive).
The drive can be set to receive all of its control information through the fieldbus
interface, or the control can be distributed between the embedded fieldbus
interface and other available sources, for example, digital and analog inputs.
 Setting up the embedded fieldbus interface (Modbus)
To take the Modbus into use, manually set the drive up for the embedded
fieldbus communication with the parameters shown in the table below. The
Setting for fieldbus control column gives either the value to use or the default
value. The Function/Information column gives a description of the parameter.
Modbus parameter settings for embedded fieldbus interface
Parameter
58.01 Protocol enable
58.03 Node address
58.04 Baud rate
58.05 Parity
58.14 Communication
loss action
Setting for
fieldbus control
COMMUNICATION INITIALIZATION
Modbus RTU
EMBEDDED MODBUS CONFIGURATION
1 (default)
19.2 kbps
(default)
8 EVEN 1
(default)
(default)
Fault
Function/Information
Initializes embedded fieldbus
communication.
Node address. There must be no two
nodes with the same node address online.
Defines the communication speed of the
link. Use the same setting as in the master
station.
Selects the parity and stop bit setting. Use
the same setting as in the master station.
Defines the action taken when a
communication loss is detected.