A blending line is most of the time combining several types of the feeder (volumetric & gravimetric, belt & slide gate, etc.) to dose the different components of the recipe with the addition of a belt weigher to deliver the requested quantity (setpoint) of blended product at the load-out station.
Each element of the blending line is driven by its PLC but a supervision software as our DataBlend is needed to calculate the moment to start and stop the motor of the feeders involved in the produced recipe in order to respect the due proportions.