Nidec SI-Interbus 2 MBd, User Manual

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62
SI-INTERBUS User Guide
Issue Number: 1
11 Control / status word
The control and status words allow the digital control and monitoring of the drive to be
implemented using a single data word for each function. Each bit in the control word has
a particular function and provides a method of controlling the output functions of the
drive, such as run and direction.
Each bit in the status word provides feedback about the drive’s state of health and
operational condition, such as drive ok, drive at speed, etc.
The default cyclic data mappings of the SI-Interbus module use the drive control word
(Pr
06.042 ) and preset reference 1 (Pr 01.021 ) for the OUT data, and the drive status
word (Pr 10.040 ) and post ramp reference (Pr 02.001 ) for the IN data.
If the drive control word is to be used for controlling the drive over the Interbus network,
then the control word must be enabled (Pr
06.043 = On).
11.1 Control word
The control word consists of sixteen control bits, some of which are reserved.
Table 11-1 Control word bit functions shows the functions of each bit in the control
word, and Table 11-2 Control word bit definitions shows the functions of each control
bit in more detail. For further details about the drive control word and sequencing bits
please refer to the appropriate drive documentation.
Table 11-1 Control word bit functions
To enable fieldbus control, the Control Word Enable (Pr 06.043 ) must be set to ‘On’,
the source of the control signals (RUN, FWD/REV. JOG, etc.) is selected using the
AUTO bit (b7). When the AUTO bit (b7) is set to ‘1’, the control word is used as the
source for the drive control. When the AUTO bit (b7) is set to 0, the drive will revert to
terminal control.
For safety reasons, the external SAFE TORQUE OFF signal must be present before the
fieldbus control word can be used to start the drive. This signal is normally provided by
an external “Emergency Stop” circuit to ensure that the drive is disabled in an
emergency situation.
The control word REMOTE bit (b8) directly controls the drive parameter Pr 01.042 ,
the function of which is to select the digital speed reference as the source of the drive’s
speed reference. When the REMOTE bit (b8) is set to 1 the fieldbus speed reference
will be used. When the REMOTE bit (b8) is set to 0 the drive will revert to using the
external analog speed reference.
b15 b14 b13 b12 b11 b10 b9 b8
Reserved
KEYPAD
WDOG
RESET TRIP Reserved Reserved JOG REV REMOTE
b7 b6 b5 b4 b3 b2 b1 b0
AUTO
NOT
STOP
RUN FWD/REV RUN REV
JOG
RWD
RUN
FWD
ENABLE