3.1. Data PreparationThe dataset is from Siemens Wuxi Medium Voltage Switch Technology Co., Ltd. The research get data from PDSS. PDSS is a JAVA-encoded system, it uses the framework is SpringBoot. The database is PostgreSQL we have chosen. Kanban is the screen set up in the workshop. PLC (Programmable Logic Controller) is responsible for controlling the machine, the research can get all of the signals from it. The PLC sends a signal to the gateway, the gateway is responsible for processing data and sends a signal to PDSS server with HTTP protocol. The mobiledevices which operating system is Android, it is responsible for sending idle reason (unobservable states) by operators to PDSS server (Figure 4). There are 52 days of data in the dataset. Treat one day as a unit length, the unit time ofeach unit length including one minute, five minutes, and ten minutes. When a unit time has more than two idle reasons, we set the state is the last state in the unit time (Figure 3).