MELSEC Programmable Controllers Preventive Maintenance Technical Bulletin

This technical bulletin from Mitsubishi outlines the standard useful life (ten years) and recommended replacement cycles (five to ten years) for MELSEC programmable controllers, emphasizing the need for preventive maintenance to avoid failures. It details the bathtub curve of failure rates, the impact of limited-life parts like aluminum electrolytic capacitors, and the Arrhenius law governing capacitor lifespan based on ambient temperature.