Control Word And Status Word; References - ABB +N5600 Firmware Instructions

634 Fieldbus control through a fieldbus adapter


Control word and Status word

The Control word is the principal means for controlling the drive from a fieldbus
system. It is sent by the fieldbus master station to the drive through the adapter
module. The drive switches between its states according to the bit-coded instructions
in the Control word, and returns status information to the master in the Status word.
For the ABB Drives communication profile, the contents of the Control word and the
Status word are detailed on pages
presented in the state diagram (page 639).
When a transparent communication profile is selected eg. by parameter group
FBA A settings, the control word received from the PLC is available in
transparent control
control through bit pointer parameters. The source of the status word, for example
06.50 User status word
Debugging the network words
If parameter 50.12 FBA A debug mode
the fieldbus is shown by parameter
transmitted to the fieldbus network by
very useful to determine if the fieldbus master is transmitting the correct data before
handing control to the fieldbus network.


References

References are 16-bit words containing a sign bit and a 15-bit integer. A negative
reference (indicating reversed direction of rotation) is formed by calculating the two's
complement from the corresponding positive reference.
ABB drives can receive control information from multiple sources including analog
and digital inputs, the drive control panel and a fieldbus adapter module. In order to
have the drive controlled through the fieldbus, the module must be defined as the
source for control information such as reference. This is done using the source
selection parameters in groups
chain and 28 Frequency reference
Debugging the network words
If parameter 50.12 FBA A debug mode
the fieldbus are displayed by
Scaling of references
Note: The scalings described below are for the ABB Drives communication profile.
Fieldbus-specific communication profiles may use different scalings. For more
information, see the manual of the fieldbus adapter.
637
word. The individual bits of the word can then be used for drive
1, can be selected in
50.13 FBA A control
22 Speed reference
chain.
50.14 FBA A reference 1
and 638 respectively. The drive states are
50.09 FBA A SW transparent
is set to Fast, the Control word received from
word, and the Status word
50.16 FBA A status
selection,
is set to Fast, the references received from
and
06.03 FBA A
source.
word. This "raw" data is
26 Torque reference
50.15 FBA A reference
51
2.