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Fieldbus control through the embedded fieldbus interface (EFB) 347
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.
Fieldbus network
Cyclic communication
2)
CW
SW
2)
ACT1
ACT2
I/O 1
I/O 2
I/O 3
...
I/O 69
Acyclic communication
1. See also other parameters which can be controlled through fieldbus.
2. Data conversion if parameter
(page 350).
control profiles
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 source of drive control commands (such as start/stop,
SEL
0
1
2
3
58.25
SEL
0
1
2
3
58.25
Data I/O
selection
58.101
...
58.114
58.25 Control profile
EFB profile
EFB CW
EFB SW
Actual 1
Actual 2
Par. 01.01...255.255
is set to
Drives. See section
ABB
1)
Start commands
Parameter
table
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