
Fieldbus control through the embedded fieldbus interface (EFB) 357
Basics of the embedded fieldbus interface
The cyclic communication between a fieldbus system and the drive consists of 16-bit
data words or 32-bit data words (with a transparent control profile).
The diagram below illustrates the operation of the embedded fieldbus interface. The
signals transferred in the cyclic communication are explained further below the
diagram.
Control word and Status word
The Control Word (CW) is a 16-bit or 32-bit packed boolean word. It is the principal
means of controlling the drive from a fieldbus system. The CW is sent by the fieldbus
controller to the drive. With drive parameters, the user selects the EFB CW as the
CW
REF1
REF2
SW
ACT1
ACT2
I/O 1
I/O 2
I/O 3
…
I/O 69
EFB CW
EFB SW
Actual 1
Actual 2
Par. 01.01…255.255
1. See also other parameters which can be controlled through fieldbus.
2. Data conversion if parameter
is set to
. See section
on page
1)
Fieldbus network
Data I/O
selection
EXT1/2
Start commands
Reference
selection
Groups
22/26/28/40 etc.
Cyclic communication
Acyclic communication
SEL
2)
Parameter
table
0
1
2
3
SEL
0
1
2
3
2)
EFB profile
Reference
selection
Groups
22/26/28/40 etc.
ACS180 FW.book Page 357 Tuesday, March 9, 2021 2:25 PM