采用IoT技术的可编程逻辑控制器之间的相互通信：Modbus RTU/MQTT方法
Inter-communication between Programmable Logic Controllers using IoT technologies: A Modbus RTU/MQTT Approach
摘要：
物联网（IoT）可以广泛应用于制造业等各种应用，实现高运营效率和提高生产率。IoT范式的开发使得使用多个PLC实现工业应用的分布式控制系统（DCS）变得更加可行。在有多个PLC的情况下，必须确保它们之间的相互通信。本文介绍了一种基于多个PLC的分布式控制系统（DCS），该系统包括多个PLC和多个PLC。提出了一种基于MQTT协议的PLC通信解决方案。以一个实验性工业装置为例，采用两台PLC控制。为了实现该过程，集成了两台西门子网关Simatic IoT2020，并通过Modbus远程终端单元（RTU）工业协议与PLC进行通信。最后，使用MQTT协议建立两个网关之间的数据交换。
英文摘要：
Internet of Things (IoT) can be widely used in various applications such as manufacturing industry,achieving high operational efficiency and increased productivity.The exploitation of IoT paradigm made more feasible the use of distributed control systems (DCS) where more than one PLCs implement an industrial application.In case of having more than one PLC,it is obligatory to ensure their inter-communication.In this paper,a solution for PLCs' communication using Message Queuing Telemetry Transport (MQTT) IoT-protocol is presented.An experimental industrial plant was used,controlled by two PLCs.For the process' implementation,two Siemens gateways Simatic IoT2020 were integrated and communicated with the PLCs through Modbus Remote Terminal Unit (RTU) industrial protocol.Finally,data exchange between the two gateways was established using MQTT protocol.
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