The Omron CJ2H-CPU66, also cataloged as the CJ2H-CPU66 Programmable Logic Controller, operates as a dedicated hardware component for centralized logic processing and instruction execution within Omron CJ2 Series automation systems.

Technical Identifier Matrix

• Base Part Number: CJ2H-CPU66
• Series Platform: CJ2 Series (CJ2H)
• Product Classification: Programmable Logic Controller (Central Processing Unit)
• Internal Execution Architecture: Dual processing engine (Standard CPU + Execution IC)

Hardware Specifications

Backplane Bus Throughput and Instruction Determinism

The Omron CJ2H-CPU66 utilizes an optimized backplane bus structure designed for high-density I/O scaling and high-speed data exchange with Special I/O Units and CPU Bus Units. Featuring a dedicated hardware engine for instruction execution, the unit reaches basic instruction execution times down to 0.016 us min. and special instruction times down to 0.048 us min.

Deterministic processing is maintained via a structured overhead time of 100 us, enabling fast loop execution. The backplane system power rail draws 0.42 A at 5 VDC directly from the CJ1W power supply unit mounted on the CPU rack, eliminating local power conversion bottlenecks and maintaining noise immunity across the local bus busbars.

Package Contents & Ordering Information

• 1x Omron CJ2H-CPU66 Central Processing Unit
• 1x CJ-Series Battery (CJ1W-BAT01, installed or loose)
• 1x Peripheral Port Cover
• 1x Instruction Sheet

Field Installation Guidelines

• Panel Mounting: Secure the unit onto a standard DIN rail (35 mm) or mount directly into an enclosure backplate using M4 screws. Ensure minimum vertical clearances of 20 mm above and below the CPU for passive thermal airflow.
• Backplane Assembly: Join the CPU module to adjacent I/O modules using the side slide locks. Engage upper and lower sliders until an audible click verifies complete backplane bus coupling.
• System Grounding: Connect the Functional Ground (FG) terminal on the system power supply unit using a dedicated wire (2.0 mm sq. minimum) to a single-point earth ground. Verify earth resistance measures less than 100 ohm.
• Serial Wiring: RS-232C cabling attached to the peripheral serial port must not exceed 15 m in overall length. Route communication cables in separate raceways away from high-voltage motor control circuits.
• Shielding: Connect communication cable braids to the connector metal shell to ensure 360-degree shielding against industrial high-frequency electromagnetic interference.

Frequently Asked Questions

• What is the input voltage requirement and current drain for the CJ2H-CPU66 on the backplane?

  The module operates on 5 VDC supplied by the rack power supply via the backplane, consuming 0.42 A under standard operational conditions.

• What is the execution speed for basic ladder instructions on this CPU?

  Basic ladder instructions execute at a minimum speed of 0.016 us, while special instructions execute at a minimum speed of 0.048 us.

• What memory card capacities are supported by the integrated memory card slot?

  The memory card slot accepts official Omron CompactFlash memory cards with capacities of 128 MB, 256 MB, or 512 MB.

• What is the force-setting and force-resetting range available in the EM Area?

  Force-setting and force-resetting operations can be performed on EM Area Banks 0 through 9 hex, or Banks 6 through 9 hex under automatic address allocation specifications.

• What is the maximum serial cable length permitted for the integrated communication port?

  The RS-232C serial communication port supports a maximum transmission distance of 15 m using standard shielded twisted-pair cabling.

• How many function block definitions and instances can be programmed into the unit memory?

  The CPU architecture supports up to 2048 unique function block definitions and up to 2048 instantiated function block calls.

• What maximum ground resistance value must be maintained during installation?

  Grounding connections at the power supply module functional ground point must maintain a resistance value of less than 100 ohm.

• Can the CPU be hot-swapped while the CJ-Series backplane is powered?

  No. Power to the CPU rack supply module must be disconnected before installing or removing the CJ2H-CPU66 processor unit to prevent backplane bus damage.