ABB ACQ550-U1-011A-6, User Manual

Page: 231 / 314

ACQ550-U1 User’s Manual 231
Fieldbus adapter
• 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:
– Parameter 9802
COMM PROT SEL
= 4 (
EXT FBA
).
– The external plug-in fieldbus adapter is configured to use the drive profile
mode or drive profile objects.
The content of the
CONTROL WORD
depends on the protocol/profile used. See the
user’s manual provided with the FBA module and/or section ABB Drives profile
technical data on page 240 .
Status Word
The
STATUS WORD
is a 16-bit word containing status information, sent by the drive to
the fieldbus controller. The content of the
STATUS WORD
depends on the protocol/
profile used. See the user’s manual provided with the FBA module and/or section
ABB Drives profile technical data on page 240 .
Reference
The contents of each
REFERENCE
word:
• can be used, as speed or frequency reference
• is a 16-bit word comprised of a sign bit and a 15-bit integer
• Negative references (indicating reversed rotation direction) are indicated by the
two’s complement of the corresponding positive reference value.
The use of a second reference (REF2) is supported only when a protocol is
configured for the ABB Drives profile.
Reference scaling is fieldbus type specific. See the user’s manual provided with the
FBA module and/or the following sections as appropriate:
• Reference scaling on page 244 ( ABB Drives profile technical data )
• Reference scaling on page 248 ( Generic profile technical data ).
Actual Values
Actual Values are 16-bit words containing information on selected operations of the
drive. Drive Actual Values (for example,
Group 10: START/STOP/DIR parameters)
can be mapped to Input Words using Group 51: EXT COMM MODULE parameters
(protocol-dependent, but typically parameters 5104…5126).
Planning
Network planning should address the following questions:
• What types and quantities of devices must be connected to the network?
• What control information must be sent down to the drives?
• What feedback information must be sent from the drives to the controlling
system?