The Omron NX-ECC202, also cataloged as the NX-ECC EtherCAT Coupler Unit, operates as a dedicated hardware component for fieldbus packet processing and local I/O module slice bridging within EtherCAT real-time deterministic networks.

Model Suffix Breakdown

• NX: Architecture platform designator for slice-type remote I/O and PLC systems.
• ECC: EtherCAT Bus Coupler unit classification.
• 202: High-capacity execution revision supporting up to 63 connected NX I/O slice modules.

Functional Specifications

Deterministic Bus Execution and Firmware Management

The internal NX bus controller handles data serialization between local I/O slices and the main fieldbus trunk. High backplane bus communication velocity Licences enable sub-millisecond refresh rates across all connected I/O channels. High-density I/O density scaling operates under strict firmware flash compatibility routines, preventing cyclic mapping errors when expanding node configurations.

Shipping Package Contents

• 1 x Omron NX-ECC202 EtherCAT Coupler Unit
• 1 x End Cover Slice (NX-END01)
• 1 x Power Supply Connector Terminal Block
• 1 x Functional Grounding Plate

Field Mounting and Wiring Standards

Rail Installation and Layout

Snap the coupler unit onto a standard 35 mm DIN rail inside an IP54 control cabinet. Attach up to 63 NX I/O modules to the right side of the unit, terminating the bus assembly with the included end cover.

Ethernet Cable Termination

Connect industrial Category 5e shielded twisted-pair cables (STP) using RJ45 connectors to the IN and OUT EtherCAT ports. Maintain cable separation from high-voltage motor leads.

System Power and Grounding

Supply 24 VDC to the unit power terminals. Connect the dedicated Functional Ground (FG) terminal directly to the main cabinet earth bar with a resistance of 100 Ohm or less to suppress high-frequency noise.

Technical FAQ

• Can individual NX I/O slices be hot-swapped while the EtherCAT coupler is powered?

  Hot-swapping individual I/O modules on the NX backplane bus during active operation is not supported and will trip a bus communication fault.

• What happens to connected I/O output states if the main EtherCAT link disconnects?

  Loss of network frames causes output channels to immediately execute pre-programmed fail-safe fallback states, holding last value or clearing to zero.

• How many total I/O slice modules can be driven by a single NX-ECC202 unit?

  The NX-ECC202 supports a maximum stack expansion of 63 individual NX I/O units on its right-side local bus interface.

• What physical wiring requirements apply to the 100BASE-TX EtherCAT ports?

  Use Category 5e or higher double-shielded aluminum tape and braided STP cables with RJ45 connectors, keeping segment lengths under 100 m.

• Does the coupler unit require a dedicated end termination block on the NX bus?

  An NX-END01 end cover must be locked onto the rightmost side of the last I/O unit to complete the internal bus loop and seal contacts.

• How is the ground terminal connected to ensure proper EMC performance?

  Wire the Functional Ground terminal to an earth ground bar using a dedicated wire with an impedance of 100 Ohm or less.

• How does firmware mismatch between the coupler and I/O modules affect boot sequence?

  Incompatible firmware revisions prevent initialization, flashing the MS/NS error LEDs and blocking EtherCAT process data exchange.

• What power supply sizing considerations apply to the internal NX bus power drive?

  Calculate the total current consumption of all 63 connected slices; if it exceeds the internal bus supply limit, insert additional power supply units.