References in speed control mode
In the speed control mode, references are 16-bit or 32-bit words containing a sign bit and
a 15-bit or 31-bit integer. A negative reference (indicating reversed direction of rotation) is
formed by calculating the two’s complement from the corresponding positive reference.
A 16-bit speed reference (REF or NSOLL_A) in hexadecimal (0…4000h) corresponds to
0…100% of Maximum Reference (as defined with a drive parameter).
A 32-bit speed reference (NSOLL_B) in hexadecimal (0…4000 0000h) corresponds to
0…100% of Maximum Reference (as defined with a drive parameter).
￭ Actual values
Actual values are 16-bit or 32-bit words containing information on the operation of the drive.
The functions to be monitored are selected with a drive parameter.
Actual values in speed control mode
The scaling of 16-bit actual speed values (ACT or NIST_A) in hexadecimal (0…4000h)
corresponds to 0…100% of the maximum reference (as defined with a drive parameter, for
example, speed scaling in ACS580 and ACS880).
The scaling of 32-bit actual speed values (NIST_B) in hexadecimal (0…4000 0000h)
corresponds to 0…100% of the maximum reference (as defined with a drive parameter, for
example, speed scaling in ACS580 and ACS880.
ABB Drives communication profile
￭ 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.
The contents of the Control word and the Status word are detailed below. The drive states
are presented on page 83.
Control word contents
The table below shows the contents of the Control word for the ABB Drives communication
profile. The upper case boldface text refers to the states shown on page 83.
STATE/DescriptionValueNameBit
Proceed to READY TO OPERATE.1OFF1_ CONTROL0
Stop along currently active deceleration ramp. Proceed to OFF1
ACTIVE; proceed to READY TO SWITCH ON unless other inter-
locks (OFF2, OFF3) are active.
0
Continue operation (OFF2 inactive).1OFF2_ CONTROL1
Emergency OFF, coast to stop. Proceed to OFF2 ACTIVE, pro-
ceed to SWITCH-ON INHIBITED.
0
80 PROFINET IO – Communication profiles
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