The document applies to one or more storage and retrieval machines in a rack aisle of a high-bay warehouse, a storage and retrieval machine in several rack aisles of a high-bay warehouse (transfer bridge operation), storage and retrieval machines on an input and/or output side of a flow rack warehouse. It does not apply to controls for the delivery and removal of stored goods. It can also be used for special conveyor systems (e.g. distribution trolleys, lifting and lowering stations, floor conveyors).*www.vdi.de/2681