Abstract

The machining systems considered are high volume transfer lines. The cycle time during normal operation is used as the performance metric. Normal operation is governed by the auto-cycle function of a logic controller. A modular logic controller is introduced and formalized for event-based functional properties analysis of transfer line. By adding time specifications, a timed modular logic controller is generated. The time-based cyclic behavior of high volume transfer lines is characterized using timed Petri nets. Two efficient algorithms to compute the cycle time and critical operations are developed. A method for improving the performance of a transfer line is introduced.

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