The Omron CJ1G-CPU45H, also cataloged as the CJ1G-CPU45H CPU Unit, operates as a dedicated hardware component for high-capacity instruction execution and data table processing within Omron CJ1 Automation Systems.

Part Number Breakdown & Memory Architecture

The model number CJ1G-CPU45H designates a high-speed controller in the Omron CJ1 CPU platform. The base prefix "CJ1G" indicates high-performance instruction processing and backplane capabilities. The suffix designation "-CPU45H" identifies an expanded memory allocation featuring 60 Ksteps of program execution memory alongside 128 Kwords of system data memory (DM: 32 Kwords, EM: 32 Kwords x 3 banks), tailored for I/O density scaling up to 1280 points.

Physical & Performance Parameters

Backplane Protocol & Network Interoperability

The unit interfaces across the CJ-series backplane bus communication velocity framework, synchronizing cyclic input/output refreshes with expansion rack modules. Maintaining strict firmware flash compatibility with CX-Programmer tools, the processor executes high-speed logic scanning while enabling deterministic data exchange across EtherNet/IP and Controller Link networks without scan jitter.

Box Contents & Accessories

• 1 x Omron CJ1G-CPU45H Central Processing Unit Module
• 1 x Set of Terminal Interface Dust Covers
• 1 x System Installation Instruction Manual

Field Installation & Earthing Procedures

• DIN-Rail Assembly & Panel Spacing

  Position the processor onto a standard 35 mm DIN rail inside a protective panel enclosure. Secure the unit using mechanical end brackets on both sides to prevent horizontal displacement. Maintain a 50 mm clearance gap above and below the module for passive convective airflow.

• Earthing & Field Line Separation

  Connect the functional earth (FE) terminal of the adjacent system power supply module to a dedicated ground bus with a resistance under 100 ohms. Separate CPU communication cables from 230 VAC power conduits and inverter output leads to prevent noise coupling.

Technical Engineering FAQ

• What is the current draw of the CJ1G-CPU45H from the 5 VDC backplane bus?

  The CPU draws 0.91 A at 5 VDC directly from the internal backplane rail powered by the system power supply module.

• Can the CPU module be removed or replaced while backplane power is active?

  No, live hot-swapping is prohibited. Power to the rack power supply unit must be turned off prior to module removal.

• What maximum discrete and analog I/O capacity does the CPU support?

  The processor directly controls up to 1280 local points mapped across the main rack and connected expansion racks.

• How is the 128 Kwords data memory structured across the internal banks?

  Data memory is divided into 32 Kwords of standard DM registers and 96 Kwords of EM memory split over 3 separate banks.

• How are active program files and memory values retained during power failures?

  An onboard lithium battery backs up user program RAM, real-time clock values, and non-volatile DM registers during power loss.

• What software tools are used for offline programming and memory configuration?

  Program development and parameter transfer are managed via CX-Programmer through the peripheral port or serial options.

• What atmospheric conditions apply to continuous operation inside a panel?

  Operate within an ambient temperature range of 0 to 55 deg C with relative humidity between 10% and 90% non-condensing.

• Does the processor support external media for program loading and data retention?

  Yes, the unit features a front-panel CompactFlash card slot for memory backups, recipe storage, and system data logging.