MODELLING INVENTORY CONTROL PROCESS USING COLOURED PETRI NETS

An approach to inventory control, based on Colored Petri Nets, is presented in the paper. Complete approach is illustrated on the example of inventory control in a publishing and printing house Politika a.d. Processes of ordering and stocking are observed and modeled. The AS-IS model is created using hierarchical, stochastic (timed) Colored Petri net. Based on that model, the several TO-BE Petri nets models are created. The first one model includes improvement of ordering strategies for obtaining optimal order quantity and reorder point with safety stock. Microsoft Excel is used for inventory optimization. Other TO-BE models include change of process itself. The core of process is detained, and the activities as annual inventory control, inventory classification and coordination between participants in process are proposed. After the simulations of all models, expected improvement of time performances is confirmed. Applying software package CPN Tools, simulation and performance analysis have been performed