To increase the flexibility of application of continuous conveyor systems, a completely decentralized control system for a modular conveyor system is introduced in the paper. This system is able to carry conveyor units without any centralized infrastructure. Based on existing methods of decentralized data transfer in IT networks, single modules operate autonomously and, after being positioned into the required topology, independently connect together to become a functioning conveyor system. Parallel to the development of the decentralized control system, identical square modules were developed, which in a compact unit contain all of the features necessary to function as a switch, junction or linear conveyor section. To fulfill this task, every module is equipped with an RFID identification system, sensors, a multi-directional drive, and a microcontroller-based control unit that executes the control algorithm. The following functions can be performed by these modules with the help of the innovative control algorithm: ac Independent generation of the topological map in the form of routing tables ac Recognition of an incoming conveyor unit and identification of the destination address ac Planning of the path to the destination taking into consideration conveyor units already located in the system ac Protection against collisions and deadlocks, and transportation of the conveyor unit to the next module ac Autonomous regulation of the injection rate to ensure the highest possible throughput The throughput performance of the control algorithm developed here was analyzed by simulating representative topologies. Furthermore, it was proven that under certain conditions, despite the conveyor routes being used in multiple directions, a situation can never arise where conveyor units block each other and the flow of material comes to a halt in the form of a deadlock.Figure 2.3: PLC (Simatic S7-400, Source: Siemens) be integrated in parallel ( Wellenreuther and Zastrow 2008), (GrAptsch 2004). S7 300 CPU312-319 S7 400 CPU412-417 Bit operation processing time 0, 1 I¼s - 0, 2 I¼s 18 ns - 75 ns Number of ... which is in practice quite popular because of its graphic troubleshooting support, is symbolically and logically closely related to an electrical wiring diagram.
|Title||:||Development of a completely decentralized control system for modular continuous conveyors|
|Publisher||:||GRIN Verlag - 2011-02-10|