The Omron CJ1H-CPU67H, also cataloged as the CJ1H-CPU67H CPU Unit, operates as a dedicated hardware component for high-speed logic execution and centralized system processing within CJ Series PLC backplane assemblies.

Memory Layout & Architecture

• Program Capacity: Integrates 250 Ksteps of memory for executing sequential control routines.
• Data Memory Configuration: Features 448K words total memory, allocated as 32K words in Data Memory (DM) and 448K words across 13 Expansion Data Memory (EM) banks (32K words x 13 banks).
• System Expansion: Supports up to 2560 local I/O points across a maximum of 40 Units (maximum 3 Expansion Racks allowed).

Hardware Specifications

High-Speed Backplane Bus Integration

The internal processing hardware coordinates with connected I/O units over deterministic backplane bus communication velocity Licences to minimize signal update delays across expansion racks. High-density modules utilize optimized internal DMA mechanisms for rapid data exchanges. Firmware flash compatibility maintains execution stability across various system expansions and high-speed processing states.

Package & Shipping List

• 1 x Omron CJ1H-CPU67H Central Processing Unit
• 1 x End Cover (CJ1W-TER01 required for bus termination)
• 1 x System Installation Sheet

Mechanical Mounting & Wiring Protocol

• Main Rack Mounting: Position the CPU directly on the leftmost slot of the primary CJ Series rack adjacent to the power supply unit.
• Bus Termination: Attach the provided end cover to the rightmost unit on the rack to complete internal bus termination.
• Grounding Connection: Connect a dedicated functional ground conductor (100 ohm or less grounding resistance) to the power supply unit terminal to prevent electrical noise interference.
• Expansion Cabling: Ensure proper CJ Series expansion cables are used when connecting up to 3 expansion racks, keeping signal path lengths within system design limits.

Technical Questions & Answers

• What is the basic instruction execution speed of this processing unit?

  The CPU executes standard basic ladder (LD) instructions at 0.02 us per instruction via high-speed internal execution logic.

• How many expansion racks can be connected to this central processor?

  The system supports up to 3 Expansion Racks, allowing a maximum configuration of 40 mountable units and 2560 I/O points.

• How is the Expansion Data Memory (EM) split across internal memory banks?

  The EM memory totals 416K words divided equally into 13 distinct memory banks, each containing 32K words, alongside 32K words of standard DM.

• What is the current draw from the internal 5 VDC system bus rail?

  The central processing unit consumes a maximum current load of 0.99 A at 5 VDC directly from the backplane power supply.

• Is hot-swapping supported when replacing attached local I/O units on the rack?

  No, removing or inserting attached I/O modules while the backplane power supply is energized can disrupt internal bus communication and cause component damage.

• What happens if the end cover is omitted from the rightmost module on the rack?

  The internal bus circuit remains incomplete, triggering a bus communication fault that halts CPU program execution.

• What software is required to download logic programs into the unit memory?

  Program transfers and memory configuration require standard CX-Programmer software communicating via peripheral or RS-232C serial protocols.

• How are user programs protected during power outage conditions?

  Program memory and system parameters are retained in flash memory, while data memory states are maintained using the integrated battery backup.