Control Word; Output Words; Input Words - ABB ACS550 User Manual

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Control interface
In general, the basic control interface between the fieldbus system and the drive
consists of:

• Output Words:

–
–
– Others: The drive supports a maximum of 15 output words. Protocols limits

• Input Words:

–
– Actual Value (speed or frequency)
– Others: The drive supports a maximum of 15 input words. Protocols limits may
Note: The words "output" and "input" are used as seen from the fieldbus controller
point of view. For example an output describes data flow from the fieldbus controller
to the drive and appears as an input from the drive point of view.
The meanings of the controller interface words are not restricted by the ACS550.
However, the profile used may set particular meanings.
Process I/O
(cyclic)
Service
Messages
(Acyclic)

Control Word

The
CONTROL WORD
system. The fieldbus controller sends the
switches between states according to the bit-coded instructions in the
WORD
• The drive is in remote (REM) control.
• The serial communication channel is defined as the source for controlling
commands from EXT1 (set using parameters 1001 EXT1 COMMANDS and 1102
EXT1/EXT2 SEL).
• The external plug-in fieldbus adapter is activated:
Fieldbus adapter
CONTROL WORD
(speed or frequency)
REFERENCE
may further restrict the total.
STATUS WORD
further restrict the total.
Fieldbus controller
Fieldbus
Control Word (CW)
References
Status Word (SW)
Actual Values
Parameter R/W Requests/Responses
is the principal means for controlling the drive from a fieldbus
. Using the
CONTROL WORD
CONTROL WORD
requires that:
ACS550 User's Manual
to the drive. The drive
CONTROL