ABB DriveIT ACH550-01 User Manual page 150

ACH550 User's Manual
other words the direction of flow (input or output) is seen from
the fieldbus controller point of view.
Typically input word 1 and 2 contain the control word and speed
reference. The meaning of the remaining input words can be
freely selected by means of the parameters in group 51; please
refer to the fieldbus user's manual for detailed instructions on the
mapping of input words. The input words are 16-bit integers that
can be used to set a reference or parameter value, or to activate
digital and analog outputs.
Typically output word 1 and 2 contain the status word and actual
speed or frequency. The meaning of the remaining output words
can be freely selected by means of the parameters in group 51;
please refer to the fieldbus user's manual for detailed
instructions on the mapping of output words. The output words
are 16-bit integers indicating actual signals and parameter
values. The scaling of the output words sent to the fieldbus
controller depends on the selected actual signal or drive
parameter; please refer to the section "Parameter listing and
descriptions".
146 Serial communications