User guide

32 MDX-ETHERNET User Guide
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9 Control and status words
9.1 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.
Each bit in the status word provides feedback about the drive's state of health and
operational condition, such as drive healthy, drive at speed, etc...
9.2 Control word
The MDX-ETHERNET control word consists of sixteen control bits some of which are
reserved. See Table 9.1 for the individual bit function descriptions.
Table 9.1 Control word
To enable fieldbus control the fieldbus enable signal must both be set to '1' (change Pr
6.43 Run/Stop source by fieldbus). When For safety reasons, the external HARDWARE
ENABLE (STO-1 and STO-2) 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 ANALOG REF/PRESET REF bit directly controls the drive parameter
Pr 1.42, the function of which is to select the digital speed reference as the source of the
drive's speed reference. When the ANALOG REF/PRESET REF bit is reset to 0 the
drive will revert to using the external analog speed reference.
Control
word bits
Pr 6.42
Decimal
conversion
Functions Equivalent parameter
0 1 Drive enable Pr 6.15
1 2 Run forward Pr 6.30
2 4 Jog Pr 6.31
3 8 Run reverse Pr 6.32
4 16 Forward/Reverse Pr 6.33
532Run Pr 6.34
6 64 Reserved
7128Reserved
8 256 Analog ref./Preset ref. Pr 1.42
9512Reserved
10 1024 Reserved
11 2048 Reserved
12 4096 Reserved
13 8192 Drive reset Pr 10.33
14 16384 Reserved
Reserved bits must be kept at 0.
CAUT ION