ABB PRO-33.0-TL Series, Service Manual

Page: 102 / 122

102 Fieldbus interfaces
Setting up embedded fieldbus interface
Set up the inverter for embedded fieldbus communication from the communication menu
or with the parameters in the group
158 Embedded fieldbus . Modbus RTU is enabled by
default. Set a unique node address for each inverter with the parameter 158.03 Node
address . Check also other communication settings including baud rate and parity. The new
settings will take effect once refreshed with the parameter 158.06 Comm control .
Parameter 158.01 Protocol enable is read only. For options, see parameter 149.21
Terminal X2 .
Accessing inverter parameters
Configuration parameters of the PRO-33.0-TL inverter can be accessed through Modbus
holding registers. Holding registers are 16-bit, read/write registers. The table below
describes the holding registers of the inverter. Registers 0 through 68 are described in
detail in a separate table. Registers 100 through 65535 are accessed using an addressing
scheme defined by parameter
158.33 Addressing mode .

Data I/O registers, 0-68
The Data I/O registers are Modbus RTU holding registers that can be programmed to give
access to any of the internal configuration parameters of the inverter. Parameters can both
be read and written to by accessing these registers, both 16-bit or 32-bit formats are
supported. The Data I/O registers give the user the possibility to group a number of
internal configuration parameters, with mixed 16/32 bit length, into a contiguous array of
registers that can be read in one operation by the Modbus master.
The Modbus data I/O registers are programmed via configuration parameters in parameter
group 158, indexes 101 ... 169. Most of the Data I/O registers have default configurations
but these can easily be changed when/if needed.
The Data I/O registers have, by default, been set up to mirror internal configuration
parameters as described in the tables below.
Data I/O registers 0 ... 2 programmed for inverter control command:
Start address End address Description
0 68 Data I/O
69 88 Not used
89 99 Modbus error codes
100 65535 Read/write registers
Holding
register FbEq (16b/32b),
scaling Description Mirrored inverter
parameter Config
Parameter Name
0 16b, 1 = 1 Inverter operation 189.01 158.101 Data I/O 1
1 16b, 1 = 1 External power limit 130.75 158.102 Data I/O 2
2 16b, 1 = 1 User Qref 124.01 158.103 Data I/O 3