Performance analysis of machining systems with modular logic controllers
E. Park, Dawn M. Tilbury, Pramod P. Khargonekar · 2003
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.