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SI-DeviceNet User Guide
45
Issue Number: 2
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8
Control / status word
8.1
What are control and status words?
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. These words can be accessed using either cyclic or
non-cyclic data.
Each bit in the status word provides feedback about the drives state of health and
operational condition, such as drive OK, drive at speed, etc.
8.2
Control word
The SI-DeviceNet control word consists of 16 control bits some of which are reserved.
See Table 8.1 for the individual bit function descriptions.
Table 8.1 Control word bit definitions
To enable fieldbus control the fieldbus enable signal (Pr
06.043
) and the auto bit (bit7)
must both be set to ‘1’. When the AUTO bit is reset to 0 the drive will revert to terminal
control.
For safety reasons, the external HARDWARE ENABLE signal must be present before
the fieldbus control word can be used to start the drive. This terminal is normally
controlled by an external “Emergency Stop” circuit to ensure that the drive is disabled in
an emergency situation.
The control word REMOTE bit directly controls the drive parameter Pr
01.042
, the
function of which is to select the digital speed reference as the source of the drives
speed reference. When the REMOTE bit is reset to 0 the drive will revert to using the
external analog speed reference.
The actual digital speed reference selected when REMOTE is set to 1 will be Pr
01.021
,
which is also the default mapping for the fieldbus speed reference. However Pr
01.015
can be used to change which of the digital references is selected. For further details on
the drive digital speed references, please refer to the appropriate drive
User Guide
.
Table 8.2 lists in detail the function of each control word bit. For further in-depth details
about drive control words and sequencing bits please refer to the appropriate drive
User
Guides
.
b15
b14
b13
b12
b11
b10
b9
b8
KEYPAD
WDOG
RESET
TRIP
JOG
REV
REMOTE
b7
b6
b5
b4
b3
b2
b1
b0
AUTO
NOT
STOP
RUN
FWD
REV
RUN
REV
JOG
FWD
RUN
FWD
ENABLE
When a trip occurs, the drive control word MUST be set to a safe, disabled state. This
ensures that the drive does not re-start unexpectedly when it is reset. This can be
achieved by continuously monitoring the drive status word and interlocking it with the
control word.
NOTE
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