This bachelor's thesis addresses the development and implementation of a system for automatic storage of process data from a controller onto an SD memory card. The purpose of the solution is to ensure continuous recording of sensor values (such as temperature and humidity) even in cases of communication failure between the programmable logic controller (PLC) and the SCADA system (Supervisory Control and Data Acquisition), or the historical database (Historian). In this way, the loss of important data is prevented, which is essential for analysis, monitoring, and traceability of industrial system operation, particularly in environments governed by Good Manufacturing Practice (GMP) standards.
The proposed solution is based on local data logging to an SD memory card integrated into the PLC, where measured variables are periodically stored even during network disconnections. Once communication is re-established, the data is automatically transferred to a computer, enabling complete restoration of historical records. The system is designed to operate independently of communication channels, thereby increasing the robustness of industrial monitoring systems.
The solution was tested on a simulated system, where sensor data were recorded into daily files. The tests confirmed reliable data logging, correct generation of new files, and successful data transfer after communication recovery. The proposed system enhances reliability and safety in process data recording and represents an effective approach to redundant acquisition of GMP-relevant measurements in industrial environments.
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