Modicon M221 - Optional Cartridges for Logic Controller The Modicon M221 logic controller is for application for controlling of simple machines and offers best-in-class performance. It requires minimal installation and offers tremendous versatility. Connect a simple remote operator panel for instant maintenance and machine visualization. Cartridges for M221 logic controller One or two cartridges can be inserted on the front without increasing the dimensions Three different types of cartridges are available: - Analog I/O cartridges - Communication cartridges - Application cartridges Schneider Electric Modicon M221 The Modicon M221 logic controller is a MachineStruxure controller. The next generation of MachineStruxure from Schneider Electric is an intuitive solution for machine automation with all the features and functions you need to build machines that will improve your bottom line. From design and development, to commissioning and maintenance, MachineStruxure is a complete machine building solution with benefits all through the machine life cycle.