Sequence controller synthesis for automated guided vehicle systems Using ordinary Petri nets

Abstract

An approach is proposed to design the pro grammable logic controller (PLC) for an automated guided vehicle system (AGVS), using ordinary Petri net (PN). First, it models an AGVS as a plant PN. Second, the PN supervisor is designed to firm a closed-loop PN by augmenting the plant PN. Specifically, it adds control transitions to the plant PN to cont . rol the wiring loops that are to make the vehicles stop for loadmg and unloading. The resultant closed-loop PN of an AGVS can be analyzed by PN theories. Lastly, it can translate a closed-loop PN into a ladder diagram that can be performed by a PLC. A laboratory AGVS is used to illustrate the present method.

A Review of Recent Advances in Automated Guided Vehicle Technologies: Integration Challenges and Research Areas for 5G-Based Smart Manufacturing Applications

“…A Petri net decomposition method, in which the entire Petri net is decomposed into task and AGV subnets was discussed in [129]. Petri net was also used to design programmable logic controller (PLC) for solving path planning problem to prevent collision among AGVs in [130] and in [131]. In [132], colored Petri net and D* Lite algorithm were applied to collision-free navigation and traffic control for AGVs.…”