Product Features: MC50 - Is our single feeder Volumetric drive controller. This is a PLC based controller that operates both our stepper motor and DC/AC drives. It comes with a color touchscreen HMI MC50G - Is our single feeder Gravimetric controller. This is a PLC based controller that operates both our stepper motor and DC/AC drives. It comes with a color touchscreen HMI MC50 Plus - Is our multi-component Volumetric or Gravimetric controller. This is a PLC based controller that operates both our stepper motor and DC/AC drives. It comes with a color touchscreen HMI