ABB ACS355 series, User Manual

Page: 326 / 436

326 Fieldbus control with embedded fieldbus
Note: Parameter writes through standard Modbus are always volatile, ie, modified
values are not automatically stored to the permanent memory. Use parameter 1607
PARAM SAVE to save all changed values.

Function codes
Supported function codes for the holding 4xxxx register:
Note: In the Modbus data message, register 4xxxx is addressed as xxxx -1. For
example, register 40002 is addressed as 0001.
40034 ACS355 Status
word MSW
R 0304 FB STS WORD 2 , ie, the most significant word of
the DCU profile 32-bit Status word.
Supported only by the DCU profile, ie, when
5305 EFB
CTRL PROFILE setting is DCU PROFILE .
Code
hex
(dec)
Function name Additional information
03
(03)
Read 4X Register Reads the binary contents of registers (4X references) in a slave
device.
06
(06)
Preset single 4X
register Presets a value into a single register (4X reference). When
broadcast, the function presets the same register reference in all
attached slaves.
10
(16)
Preset multiple
4X registers Presets values into a sequence of registers (4X references). When
broadcast, the function presets the same register references in all
attached slaves.
17
(23)
Read/Write 4X
registers Performs a combination of one read operation and one write
operation (function codes 03 and 10) in a single Modbus
transaction. Write operation is performed before the read
operation.
Modbus register Access Information