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After explaining the necessity of sequential sorting processes within branched conveyor systems and introducing basic sequential controlling principles, this paper analyses with a simulation study different ways of implementing sequential supply processes for small load carriers in an abstracted automated intralogistics system. Simulation results show that a layout with sequencing systems with explicit buffer places can ensure much higher sequential throughput performances than a layout with a loop for sequencing or a layout which implements sequencing processes just with the control of carrier sources. Because of sequential control dependencies in the layout with buffer places, further experiments for sequential supply processes with different layouts forms have to be assessed.
This article reviews the state of the art in research regarding sustainable extensions of hierarchical production planning. Sustainability is currently of considerable importance due to various interest groups. Hierarchical operational production planning and control is the state of the art in research as well as in industrial practice for planning of stations and their aggregations to production systems. Thus, it might be highly relevant to improve sustainability. In the literature mainly the scheduling level as well as the ecological dimension are considered. So the current research is limited to selected partial planning problems and incomplete with regard to sustainable aspects that emerge.