This manual distinguishes two sorts of safety instructions. Warnings are used to inform of conditions which can, if proper steps are not taken, lead to a serious fault condition, physical injury and death. Notes are used when the reader is required to pay special attention or when here is additional information available on the subject. Notes are less crucial than Warnings, but should not be disregarded.

The NDBU-85 and NDBU-95 branching units are used for distributing a DDCS-protocol control link to several drives. The controlling unit can be e.g. a PC equipped with DriveWindow and a DDCS interface; an Advant application controller (such as an AC 80); or a Fieldbus Communication Interface (FCI, type CI810) equipped with a TB810/ TB811 Optical ModuleBus Port.