Purpose: Three types of LPWA LoRa module were investigated as candidate smart sensor systems in a smart factory. A long-distance communication success test was conducted to determine which module type best satisfied functional safety requirements.
<br>Methods: The three types of LoRa communication module considered in this paper were 1. sLory, 2. RYLR890 using UART interface and 3. P2P UART communication module RAK811. A communication success field demonstration test was performed at 3.24 km in the city center and in a flat area (Ansan-si).
<br>Results: The RYLR890 module type achieved communication success up to 3 km. However, the communication success rate from departure to arrival was unstable. The RAK811 achieved communication up to 2 km and the field test demonstrated that the transmission/reception performance was stable from departure to arrival.
<br>Conclusion: Three types of LoRa module were selected for LPWA and the world's first field verification test was conducted. It was verified that the RAK811 model’s field communication success rate meets functional safety requirements. However, it is still necessary to ensure the functional safety of sensor-node, communication system and PHM technology by examining structural aspects such as longitudinal axis, lateral side and height.
