Distributed short interval scheduling in a shop-floor network

Abstract The increasing need to reduce costs in the production process through responsive scheduling is feasible as a result of the availability of micro-computers. The transition from a batch MRP system to real time control is a long term evolutionary process, which classically begins with the development of a data collection network. This paper discusses a three phases approach to developing a distributed short interval scheduling system. The phases are: (1). Pre-scheduling . Integration of the basic data dealing with the production process, i.e. availability of machines, tools, fixtures, and the selection of the production lot sizes. An MRP system allocates the load for specific work centers, assuming infinite capacity. Our distributed scheduling system uses the MRP schedule with the tools and fixtures inventory of individual work stations. (2). Short-interval scheduling . According to the local availability of tools and fixtures, a detailed run-time schedule is determined for every part and the number of parts that will be processed in each specific shift. (3). Post-scheduling . Involves the generation of individual operator and machine schedules that include general run-time instructions. The approach includes the development of a library of scheduling tools which can be customized to the unique characteristics and requirements of individual work stations found in a facility utilizing numerically controlled equipment.