The Omron CJ1W-CLK23, also cataloged as the CJ1W-CLK23 Controller Link Unit, operates as a dedicated hardware component for high-speed peer-to-peer data linking and message communications within CJ Series PLC backplanes.

Model Designation and Architecture Layout

The Omron CJ1W-CLK23 interfaces directly with the local system rack, serving as a high-performance network interface module:

• CJ1W: Dedicated module footprint for Omron CJ-series system racks (CJ1G, CJ1M, CJ2M, and CJ2H CPUs).
• CLK: Controller Link network interface designation supporting HDLC frame synchronization and token-bus media access.
• 23: Wire-type media variant hardware revision for wired shielded twisted-pair connections.
• System Integration: Mounts into any standard CPU or expansion rack slot, with a maximum limit of 8 units per CPU Unit.

Operational Parameters and Technical Specifications

Deterministic Network Execution & Backplane Velocity

The module offloads protocol framing from the main PLC processor, maintaining continuous peer-to-peer data links without lengthening ladder execution cycle times. Backplane bus communication velocity handles deterministic network refresh synchronization directly across shared internal registers. Firm firmware flash compatibility across CJ-series processors guarantees stable network startup cycles and immediate token recovery during transient physical bus dropouts.

Package Component Checklist

• 1 x Omron CJ1W-CLK23 Controller Link Unit
• 1 x Wire-type communications connector plug
• 1 x Panel grounding strap instruction sheet

Physical Wiring and Bus Installation Rules

• Power Interruption: Always isolate the PLC system power supply before inserting or extracting the module from the rack slot.
• Twisted-Pair Termination: Use specified shielded twisted-pair cabling and attach 220-ohm terminal resistance elements at both physical ends of the multidrop bus segment.
• Shield Grounding: Ground the cable shield wire at one single point to the panel protective earth (PE) terminal to prevent ground loops.
• Cable Separation: Route communication lines in separate conduit away from AC power wiring and variable frequency drive outputs by at least 200 mm.

Technical Questions & Field Support

• How is the physical node address configured on the CJ1W-CLK23 hardware?

  Set the rotary switches on the front panel to the assigned node address prior to energizing the PLC backplane supply.

• Does the CJ1W-CLK23 support hot-swapping on a live CJ-series rack?

  No. Removing or inserting the module while the system rack is energized causes backplane communication errors and CPU halts.

• What supply voltage powers the internal logic of the Controller Link unit?

  The unit draws its operational power directly from the 5 VDC supply rail on the PLC backplane at 0.35 A.

• How many Controller Link units can be mounted to a single CJ CPU unit?

  Up to 8 Controller Link units can be mounted on a single CJ-series CPU unit, subject to power supply limits.

• What communication topology is utilized for field bus interconnections?

  The unit uses a multidrop bus topology employing wired shielded twisted-pair cabling running an N:N token-bus protocol.

• What happens to data link execution if a node drops offline?

  The token passes around the failing node, maintaining continuous data link updates across all remaining operational network nodes.

• Are external termination resistors required for the communications segment?

  Yes. Terminal resistance switches or resistors must be engaged at both physical ends of the multidrop network cable run.

• How does HDLC flag synchronization benefit the network transmission?

  HDLC framing provides reliable bit synchronization, cyclic redundancy error checking, and determinism across high-density data link tables.