Basics Of The Embedded Fieldbus Interface; Control Word And Status Word - ABB ACQ80-04 Firmware Manual

226 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.
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
profiles (page 229).


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, emergency stop, selection
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 ABB Drives. See section
1)
Start commands
Parameter
table
About the control