Modbus protocol is widely used in industrial automation, that allows the transfer of sensor data to take place over a serial interface, using a request-response framework. However, the deployment of Modbus relies on cabling and its scalability is restricted. In this paper, we propose an industrial automation framework that uses the low power connection-less mode of Bluetooth Low Energy to transfer data from the sensor nodes to a central Gateway using extended advertisements, and uses Modbus to relay the sensor data to the main supervisory unit. The Gateway stores all the packets received from the end nodes in a local storage, which is accessed each time a Modbus request for the data of a particular node is received. The paper proposes a customized wired data exchange algorithm developed on top of the standard Modbus RTU protocol, and efficient memory access (read/write) algorithms that ensure quick fetching of the sensor data from the storage at the Gateway corresponding to each Modbus request, making the response time independent of the size of the sensor network. We have provided real-time experimental results to show the high reception rates (94-100%) of sensor data transmitted using BLE extended advertisements in dense deployments, quick responsiveness of the Gateway (almost constant request-response time of 250 ms approximately), and the successful reception of sensor data at the supervisory unit using the proposed framework.
A Novel BLE Extended Advertising Based Industrial Automation Framework with Modbus Protocol
2024-06-24
2590751 byte
Conference paper
Electronic Resource
English
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