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Profinet IO IRT Message Scheduling With Temporal Constraints

机译:具有时间约束的Profinet IO IRT消息调度

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This paper presents an algorithm that allows one to create a static schedule of the Profinet IO IRT (Isochronous Real Time) communication, which is an industrial Ethernet protocol standardized in IEC 61158. This algorithm offers an alternative to the available commercial tool, providing comparable results with respect to the resulting schedule makespan. Furthermore, the problem is extended by useful temporal constraints (i.e., release dates, deadlines and end-to-end deadlines of the messages) providing a greater flexibility with respect to the individual messages. Due to this flexibility, it is possible to place the selected messages in various parts of the communication cycle (in order to increase the computational time available for the main-controller application, or to retransmit the synchronization message without holdup in the switch, or to add new messages into the original schedule). The solution is based on a formulation of the Profinet IO IRT scheduling problem in terms of the Resource Constrained Project Scheduling with Temporal Constraints.
机译:本文提出了一种算法,该算法允许创建Profinet IO IRT(等时实时)通信的静态时间表,这是IEC 61158中标准化的工业以太网协议。该算法为可用的商用工具提供了替代方案,可提供可比的结果关于生成的计划完成时间。此外,通过有用的时间限制(即,消息的发布日期,截止时间和端到端截止时间)扩展了该问题,从而为各个消息提供了更大的灵活性。由于这种灵活性,可以将选定的消息放置在通信周期的各个部分中(以增加主控制器应用程序可用的计算时间,或者重新发送同步消息而不会在交换机中停滞,或者将新消息添加到原始计划中)。该解决方案基于Profinet IO IRT计划问题的公式化,该计划问题涉及具有时间约束的资源受限项目计划。

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