The NX-series modular I/O system is built around a new high-speed interconnection bus that links the EtherCAT bus coupler to a wide range of I/O units.
The individual I/O units use EtherCAT's Distributed Clock to compensate for signal delays depending on their position in the system. As a result, inputs can be latched and outputs set anywhere in the control system with sub-microsecond accuracy. This accuracy means machines can achieve higher production quality and increased throughput.
For further information please take a look at this NX-Series Datasheet.