Abstract
A synthesis, at an arbitrary level, of sequential discrete manufacturing process control systems has been provided in this paper. New methods have been presented: the MTS and GRAFPOL syntheses of sequential control systems. The MTS (net transformation method) is a method of classical synthesis of sequential control systems. It allows for the design of classical contact-relay sequential systems. GRAFPOL is a method of system synthesis. It allows for the modelling of discrete processes and programming of PLCs (programmable logic controllers). It has been shown that a single universal algorithm of a discrete manufacturing process exists, represented by the operation net, or its equivalent the GRAFPOL-MS net (of Mikulczyński and Samsonowicz). The algorithm of the process is the basis for determining a universal control algorithm which represents an action net or its equivalent, the GRAFPOL-TMS net. The control algorithm may be used at an arbitrary level of the synthesis of sequential control systems.
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