The Omron CJ1W-CORT21, also cataloged as the CJ1W-CORT21 CANopen Communication Unit, operates as a dedicated hardware component for CAN bus network integration within SYSMAC CJ Series platforms.

Technical Identifier Matrix

• Brand: Omron
• Base Model: CJ1W-CORT21
• Full Part Number: CJ1W-CORT21
• Series Name: SYSMAC CJ Series
• Product Type: CANopen Communication Unit
• Unit Classification: CPU Bus Unit

Hardware Specifications

PLC Controller Processing & Backplane Communication

The CJ1W-CORT21 manages deterministic message exchange between the CANopen field network and the host CPU across the internal backplane bus velocity channels. Operating as a CPU Bus Unit, it processes real-time transmit and receive buffers directly mapped to CPU memory locations. High-density I/O density scaling allows up to 16 units to co-exist on a single CJ PLC system while allocating dedicated unit numbers from 0 to F via front panel rotary switches, ensuring strict profinet/EtherNet/IP determinism compliance and firmware flash compatibility across CJ-series system racks.

Package Contents & Ordering Information

• 1x Omron CJ1W-CORT21 CANopen Communication Unit
• 1x 5-Pin Open-Style Fieldbus Connector

Field Installation Guidelines

• Mounting: Seat the module into the designated slot on the CJ CPU or expansion rack, pushing down firmly until upper and lower locking sliders click securely onto the DIN rail.
• Wiring: Connect CAN_H, CAN_L, CAN_GND, and 11 to 25 VDC external network power lines to the 5-pin open-style communications connector.
• Shielding: Ensure continuous cable shield continuity by grounding the CAN trunk line shield via a 360-deg braid shielding connection at the power supply termination point.
• Grounding: Route a short, low-impedance copper grounding strap from the CPU rack functional earth (FE) terminal directly to the enclosure main protective earth rail.

Frequently Asked Questions

• How is the Unit Number configured on the CJ1W-CORT21?

  The Unit Number is set using the front panel hexadecimal rotary switch across an available address range of 0 to F.

• What external voltage is required for CAN bus transceiver power?

  The module requires an external network supply voltage between 11 and 25 VDC fed directly through the communications connector.

• How does adding the CJ1W-CORT21 affect the CPU Unit cycle time?

  The module adds 0.3 ms + 0.0064 ms multiplied by the total number of allocated buffer memories to the main CPU cycle time.

• What physical dimensions apply to the CJ1W-CORT21 hardware unit?

  The physical dimensions measure 3.1 cm x 9.0 cm x 6.5 cm with an overall hardware weight of 0.16 kg max.

• How many CJ1W-CORT21 units can be mounted to a single CJ PLC system?

  A maximum of 16 CPU Bus Units can be mounted across the CPU rack and connected expansion racks.

• How is the CAN bus communication baud rate selected on the hardware?

  The communication baud rate is configured using the 3-position digital DIP switches located on the front panel of the unit.

• Does the CJ1W-CORT21 support hot-swapping during backplane operation?

  No, the CJ-series backplane does not permit live insertion; power to the expansion rack must be turned off before replacing the unit.

• What maximum number of nodes can be connected on a single CAN bus line?

  The module architecture imposes no software limit, allowing an unlimited number of physical units to be connected per CAN network segment.