Serial communications
149
ACH550 User's Manual
Control Word.
The Control Word is the principal means for
controlling the drive from a fieldbus system. The fieldbus
controller sends the Control Word to the drive. The drive
switches between states according to the bit-coded instructions
in the Control Word. Using the Control Word requires the
following:
• The drive is in remote (AUTO) control.
• The serial communication channel is defined as the source
for controlling commands (set using parameters 1001
EXT
1
COMMANDS
, 1002
EXT
2
COMMANDS
and 1102
EXT
1/
EXT
2
SEL
).
• The plug-in fieldbus adapter module is activated by setting
parameter 9802
COMM
PROT
SEL
to 4 (
EXT
FBA).
• The plug-in fieldbus adapter module is configured to use the
vendor specific mode or vendor specific objects.
The following table and the state diagram on page
describe
the Control Word content.
Process data from drive to fieldbus controller (Data set 2)
Data word
Contents
4
Status word
5
Actual speed
6
Actual torque
Control Word
Bit
Name
Value Comments
0
OFF1 CONTROL
1
Enter
READY
TO
OPERATE
.
0
Stop along currently active deceleration
ramp (2203/2205). Enter
OFF
1
ACTIVE
;
proceed to
READY
TO
SWITCH
ON
unless
other interlocks (
OFF
1,
OFF
3) are active.
1
OFF2 CONTROL
1
Continue operation (
OFF
2 inactive).
0
Emergency
OFF
, coast to stop.
Enter
OFF
2
ACTIVE
; proceed to
s
WITCH
-
ON
INHIBITED
.
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