The Omron NX-OD6256-5, also cataloged as the NX-OD6256 Digital I/O Unit, operates as a dedicated hardware component for high-density 24 VDC switching and load drive execution within Sysmac EtherCAT and EtherNet/IP networks.

Internal Part Designation Scheme

• NX: Slice I/O modular platform family.

• OD: Digital transistor output function group.

• 6256: High-density configuration with 32 transistor output channels.

• 5: PNP logic output type with 1-wire connection interface.

Parameter Ratings & Performance Specifications

Synchronous Backplane Bus & High-Density Execution

The module interfaces directly with the internal NX bus to achieve deterministic signal processing synchronized with the CPU primary task period. High backplane bus communication velocity supports cycle-accurate output refreshes across all 32 PNP transistor channels simultaneously. Embedded firmware flash compatibility maintains consistent timing profiles across system updates, providing scalable I/O density scaling while preserving isolation between logic and field power domains.

Shipment Box Contents

• 1 x Omron NX-OD6256-5 Digital Output Slice Unit

• 1 x Terminal Block Connector Unit

• 1 x Module Installation Sheet

Panel Installation & Field Wiring Protocol

• Slice Assembly: Align the side hooks of the NX module with the adjacent CPU or EtherCAT Coupler unit and slide until the internal bus connectors lock into engagement.

• 1-Wire Connection: Wire 24 VDC actuators directly to individual output terminals using 1-wire topology, connecting common reference lines to dedicated IO power distribution terminals.

• Conductor Specification: Insert ferruled solid or stranded copper wires ranging from AWG 24 to AWG 16 into the push-in terminal slots for gas-tight contacts.

• Shield Grounding: Keep low-voltage output cables physically separated from motor inverter leads and AC supply lines to prevent inductive noise pickup.

Maintenance & Diagnostic FAQ

• What is the response delay time for the output channels?

  The hardware propagation time measures 0.5 ms maximum for OFF-to-ON state switching and 1.0 ms maximum for ON-to-OFF state switching.

• Does this module support hot-swapping on an active EtherCAT bus coupler?

  No, removing or inserting the module requires powering down the local NX bus segment to prevent backplane communication errors or hardware damage.

• How are output loads powered across the 32 channels?

  Field power is drawn from the I/O power supply terminals routed through the NX bus or an auxiliary power supply unit, operating between 20.4 and 28.8 VDC.

• Can the outputs be synchronized with the master PLC execution cycle?

  Yes, the module supports synchronous I/O refreshing, locking state updates directly to the EtherCAT distributed clock and CPU primary task period.

• What happens if an individual output channel experiences an overcurrent event?

  Internal protection circuits trip to isolate the fault, preventing damage to the internal transistor switches and reporting diagnostic flags to the CPU.

• Is external field power required for the PNP output drive circuit?

  Yes, 24 VDC field supply must be supplied via the NX bus power distribution rail or an additional NX-PF feed unit to power external loads.

• What wire terminal technology is used on the removable connector block?

  The unit utilizes Push-In Plus spring-cage terminals, allowing tool-less direct wire insertion for vibration-resistant electrical connections.

• Can 2-wire or 3-wire field devices connect directly to this module?

  Because this module uses 1-wire connections, 2-wire and 3-wire loads require external common terminal blocks or additional power distribution units.