The Control Word And The Status Word; References; Actual Values - ABB NPBA-12 Installation And Startup Manual

Chapter 6 – Communication
The Control Word and
the Status Word

References

Actual Values

6-6
The Control Word (PROFIBUS Parameter 967) is the principal means
for controlling the drive from a fieldbus system. It is sent by the fieldbus
master station to the drive, the adapter module acting as a link. The
drive switches between its states according to the bit-coded
instructions on the Control Word, and returns status information to the
master in the Status Word (PROFIBUS Parameter 968).
The contents of the Control Word and the Status Word are detailed in
Table 6-1 and Table 6-2
information on the drive-specific bits. The drive states are presented in
the PROFIBUS State Machine
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 analogue and digital inputs, the drive control panel and a
communication module (e.g. NPBA-12). In order to have the drive
controlled through PROFIBUS, the communication module must be
defined as the source for control information, e.g. Reference. The
scaling of the integer received from the master as Reference is drive-
specific. See its Programming Manual for available control source
selections and Reference scaling factors.
Actual Values are 16-bit words containing information on the operation
of the drive. The functions to be monitored are selected with a drive
parameter. The scaling of the integers sent to the master as Actual
Values depends on the selected function. Please refer to the drive
documentation.
respectively; see the drive documentation for
(Figure 6-2).
NPBA-12 Installation and Start-up Guide