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Fieldbus control through the embedded fieldbus interface (EFB)
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
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
. See section
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.
…
Содержание ACS280
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