IO-Link power supplies are equipped with the Heartbeat function. This function consists of stress level indicator, load level indicator and life expectancy indicator, which lets users know visually how the power supply is doing and when a power supply would need to be replaced. These three indicators help operators to use the power supply within an optimal range. The IO-Link function enables getting information parameters to the control system in the least costly manner. The control system then can alert operators for counter actions to prolong the use of the power supply to the maximum possible life.