Configured for multi-axis motion execution and high-speed servo drive control in CJ I/O Bus architectures, the Omron CJ1W-NC882 (CJ1W-NC882 Position Control Unit) provides direct physical and electrical execution of motion commands over an integrated EtherCAT Master fieldbus interface.

Technical Identifier Matrix

• Base Part Number: CJ1W-NC882
• Brand: Omron
• Module Type: Position Control Unit (Positioning)
• Expansion Unit Type: CPU Bus Unit
• I/O Bus Architecture: CJ I/O Bus
• Network Interface: EtherCAT Master

Hardware Specifications

Backplane Bus Velocity & Deterministic EtherCAT Execution

The Omron CJ1W-NC882 interfaces directly with the high-speed CJ I/O backplane bus, functioning as a dedicated CPU Bus Unit to achieve high-velocity memory mapping between the central PLC processor and external motion drives. The module exchanges position profile data, velocity vectors, and status flags across memory-mapped CPU Bus Unit memory areas during cyclic backplane refresh scans.

The integrated EtherCAT Master port delivers microsecond-level clock synchronization across up to 8 axes of motion drives. Deterministic control loop updates are maintained via distributed clocking mechanisms embedded in the EtherCAT protocol, minimizing jitter across synchronized multi-axis profiles. Firmware flash compatibility allows field update of drive profile tables without interrupting CPU backplane logic definitions.

Package Contents & Ordering Information

• 1x Omron CJ1W-NC882 Position Control Unit
• 1x Hardware Installation Sheet

Field Installation Guidelines

• Rack Mounting: Align the CJ1W-NC882 unit on the CJ-series CPU Rack or Expansion Rack DIN rail guide, sliding the module horizontally until the top and bottom rack locks snap into position.
• Unit Address Assignment: Rotate the front-panel rotary unit switch (0 to F Hex) to assign the dedicated CPU Bus Unit address before applying backplane power.
• EtherCAT Cabling: Connect field servo drives using industrial-grade Shielded Twisted-Pair (STP) Category 5 (or higher) Ethernet cabling terminated with shielded RJ45 connectors.
• Shielding & Grounding: Ensure the RJ45 connector outer shell bonds directly to the module chassis earth. Ground the CPU Rack functional ground (FG) terminal to a protective earth rail using a 2.0 mm sq or larger conductor with a 360-deg braid clamp assembly to prevent high-frequency noise injection.

Frequently Asked Questions

• What is the maximum number of controlled motion axes for the CJ1W-NC882?

  The CJ1W-NC882 functions as an EtherCAT Master controlling up to 8 independent or synchronized motion axes via a single port.

• What current is drawn from the internal 5 VDC backplane bus?

  The unit draws a maximum operating current of 500 mA (2.5 W power consumption) from the 5 VDC backplane bus supply.

• Can the CJ1W-NC882 be inserted or removed while backplane power is ON?

  No, power to the CPU Rack and connected Expansion Racks must be completely isolated before installing or removing the CPU Bus Unit.

• What media type is required for the EtherCAT Master fieldbus connection?

  Connections require Category 5 or higher Shielded Twisted-Pair (STP) Ethernet cabling terminated with shielded RJ45 connectors.

• How is the backplane unit address configured on the module front panel?

  The unit address is set manually via the front-panel rotary switches across a range of 0 to F Hex prior to powering up the CPU rack.

• Does the EtherCAT Master port support standard Ethernet switches?

  No, EtherCAT fieldbus networks use deterministic pass-through timing and must connect directly from the master to slaves without standard Ethernet switches.

• How does the CJ1W-NC882 maintain multi-axis synchronization?

  The module utilizes EtherCAT distributed clock mechanisms to achieve microsecond-level clock synchronization across all configured servo axes.

• What grounding procedure prevents noise coupling into the positioning unit?

  Connect the CPU Rack FG terminal to a protective earth rail via a low-impedance conductor with 360-deg braid shielding on signal cables.