The XI/ON ECO system supplements the XI/ON standard I/O system with I/O modules and gateways that are optimized for price and space. The ECO modules do not require any base modules and are fully compatible with the standard XI/ON system. High channel density (up to 16 DI/DO on 13 mm), 'push-in' spring-loaded terminals, 8 or 16 channels per module. The ECO gateways serve the CANopen, Profibus-DP and Ethernet bus systems.