BECKHOFF BK3xx0 - Manual (Page 76)

Notes on the Documentation
74 Fieldbus Components
Word Alignment
In order to obtain the I/O data in the controller's process image in a clear form in controllers with word-oriented
process images, it is possible to specify that word alignment is used when the coupler generates its process image.
This involves a dummy byte being inserted for every variable that is larger than one byte and which would start on an
uneven address.
Word alignment can be set in the UserPrmData:
Byte Bit Value Description
9 5 1
bin
Word alignment is active
When using the DP modules it is necessary to ensure that only those complex modules that are identified with word
alignment are used.
The extended GSD file must be used in order to set word alignment in text form in the master's configuration tool and
to be able to select the word alignment module.