Chapter 5 – Programming
5-4 NPBA-12 Installation and Start-up Guide
ABB DRIVES
The NPBA-12 relays the Control Word “as is” from the PROFIBUS
master to the drive. The Status Word is relayed to the master as
received from the drive, except bit 15 which is used as a DDCS
communication error indicator. The Control and Status Word bits are
assigned as defined by the ABB Drives Profile (based on the
PROFIBUS standard).
CSA 2.8/3.0
The Control Word and the Status Word are altered in order to match
the drive Control and Status Words to those defined by the PROFIBUS
profile.
CONTROL ZERO MODE This parameter defines the operation of the NPBA module in the event
that only messages consisting of zeros are received from the
PROFIBUS controller. This is the case e.g. when the controller is
switched from RUN to STOP mode.
STOP
The messages are forwarded to the drive as such. This will usually
cause the drive to stop; for more information, consult the drive
documentation.
FREEZE
The last-received valid Control Word and References are sent to the
drive until new values are received from the PROFIBUS controller.
Control Locations
ABB drives can receive control information from multiple sources
including digital inputs, analogue inputs, the drive control panel and a
communication module (e.g. NPBA-12). ABB drives allow the user to
separately determine the source for each type of control information
(Start, Stop, Direction, Reference, Fault Reset, etc.). In order to give
the fieldbus master station the most complete control over the drive,
the communication module must be selected as source for this
information. See the user documentation of the drive for information on
the selection parameters.
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