IOT based Over and Under Voltage Protection for Automated Silo Storage System Using LOGO PLC

Automated silo storage systems need predictible protection in the event of abnormal supply-voltage conditions, as well as continuous supervision of environmental parameters. Typically, conventional implementations require another protection and monitoring device, which adds complexity and expense to systems. This paper introduces a common PLC based architecture which includes over and under voltage detection, multi-stage protection of motors, temperature and humidity measurement and alarm handling in a single Siemens LOGO! controller. Transportation of measurements to the protection layer is done locally so that the protective actions are not dependent on the communication layer. The Modbus-based interface, Node-RED and Blynk platform is used for remote supervision, visualisation and event monitoring. The control logic developed worked well in identifying the high and low voltage tested conditions and then starting the programmed protection sequence and the appropriate environmental alarms were generated. The communication pathway also passed on representative operating information to the remote dashboard. The results show that a low-cost and integrated protection and monitoring system for automated silo storage systems is viable; however, hardware validation is needed for full field-level evaluation.