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DP-V1 communication
72
The Control Word and the Status Word
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 gateway. 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 Tables
11
and
12
respectively; see the drive
documentation for information on the drive-specific bits. The drive
states are presented in the PROFIBUS State Machine (Figure
13
).
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 analogue and digital inputs, the drive control panel and a
communication module (e.g. RPBA-01). In order to have the drive
controlled through PROFIBUS, the communication module must
be defined as the source for control information, e.g. Reference.
In the Vendor Specific mode, 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.
In PROFIdrive mode, the speed reference (REF) in hexadecimal
(0 … 4000h) corresponds to 0 … ‘motor nominal speed’.
Actual Values
Actual Values are 16-bit words containing information on the
operation of the drive. The functions to be monitored are selected
by a drive parameter. The scaling of the integers sent to the
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Содержание RPBA-01
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