Networks

Omron uses EtherCAT as the control network for the Sysmac NJ Machine Controller series because of the convenience of Ethernet cabling and the fast data exchange. The openness, modularity and determinism are the key elements in today’s machine automation. EtherNet/IP uses the CIP protocol over standard Ethernet infrastructure to offer efficient yet reliable data exchange. Using the EtherNet/IP bus coupler, NX-series I/O can be connected to the CJ and CS PLC series.
Design Features and Benefits:

• The units are compact, with a standard width of 12 mm per unit, yet offer up to 16 channels per unit
• The front connectors feature toolless push-in wiring with 8 mm ferrules for wire up to 1.5 mm2
• The terminals are removable to allow pre-wiring and safe step-by-step testing
• Matching labels on unit and connector reduce the chance of incorrect assembly
• Insert 6 keys in the terminal and unit to mechanically prevent a mismatch

Performance

Each set of the NX-series I/Os on an EtherCAT coupler counts as a single EtherCAT node so network performance is not affected by the number of installed I/O units. Keeping the number of EtherCAT nodes to a minimum helps to keep the refresh cycle times of EtherCAT motion axes as low as possible, even at high I/O counts. Local fault or damage to an I/O unit will not affect other EtherCAT nodes down the line. The internal bus of the NX-series is fully synchronised with the EtherCAT Distributed Clock, which assures exact timing of any input or output unit in the control system to within 1 µs.