whenever my pump is running, my plc starts a timer to record operating hours. It's very basic counter that counts the minutes the pump is on. The plc controls the pressure by an analog signal and variable speed drive and normally runs between 50% to 90% of full speed. Is it normal to create some logic to slow down the plc operating hour timer when the pump is not operating at full speed to reduce the maintenance intervals? for example, run the hour counter at 50%, 60%, 70%, 80%...