The Omron CJ2M-CPU15, also cataloged as the CJ2M-CPU15 Programmable Controller, operates as a dedicated hardware component for central logic processing and instruction execution within Omron CJ Series PLC networks.

Technical Identifier Matrix

• Base Model: CJ2M-CPU15
• CPU Family: CJ2M Central Processing Unit
• Product Classification: Programmable Logic Controller CPU Module
• Option Slot Provision: 1x Option Board Slot (Supports Serial Option Board or Analog I/O Unit)
• Built-in Communications: USB Port (Type-B) for programming; serial interface via option board

Hardware Specifications

Backplane Bus Velocity and Execution Latency Analysis

The Omron CJ2M-CPU15 utilizes a high-speed internal backplane bus interface capable of maintaining consistent bus execution throughput across expanded racks. Featuring an instruction execution rate of 0.04 us for basic LD commands, the CPU minimizes internal scan overhead while processing high-density I/O configurations up to 2,560 total points. High-speed backplane synchronization ensures stable bit-processing times and deterministic signal updates to local and expansion rack I/O units. Memory handling allocates dedicated registers across 60K steps of program space and 160K words of data memory divided into structural banks, supporting multi-tasking execution profiles and advanced function block routines without degrading system latency.

Package Contents & Ordering Information

• 1x Omron CJ2M-CPU15 CPU Module
• 1x End Cover (CJ1W-TER01 required for backplane termination)
• 1x Instruction Manual Sheet

Field Installation Guidelines

• Rack Mounting: Secure the CPU module directly to the CJ-Series backplane rail interface adjacent to the power supply unit. Verify the end cover unit is anchored at the rightmost termination point of the CPU rack to prevent backplane signal reflection.
• Option Board Assembly: Insert optional RS-232C (CP1W-CIF01) or RS-422A/485 (CP1W-CIF11/12) boards into the designated CPU front slot only when system power is entirely off.
• Grounding: Connect the functional ground (FG) terminal of the adjacent power supply unit to a dedicated earth ground using a wire gauge of at least 2.0 mm sq. Maintain earth resistance under 100 ohms.
• Shielding: Terminate communication cable shields to the connector shell or external grounding bar. Avoid routing low-voltage serial wiring parallel to high-voltage AC motor drives or power lines.

Frequently Asked Questions

• What is the primary backplane current draw for the CJ2M-CPU15 module?

  The unit draws 0.5 A at 5 VDC directly from the internal backplane power supply unit. It has no 24 VDC backplane consumption.

• Does the CJ2M-CPU15 include built-in EtherNet/IP communications?

  No, the CJ2M-CPU15 model does not feature integrated EtherNet/IP port hardware. An option board or expansion module is required for serial or network connectivity.

• What is the execution speed for basic logical operations on this processor?

  Logical execution timing for basic instructions (such as the LD command) completes in 0.04 us.

• How many total I/O points and units can be controlled by this CPU?

  The CPU manages up to 2,560 I/O points across a maximum of 40 expansion or local I/O units.

• What is the functional capacity allocated for data memory storage?

  The unit provides 160K words total memory capacity, divided into standard DM space and 4 banks of extended memory (EM) at 32K words per bank.

• Can option boards be hot-swapped while the CPU is powered on?

  No, option boards must never be inserted or removed while power is applied to the CPU rack. Power off the system before installation.

• What specific memory card types are supported for offline data logging?

  The CPU features a dedicated slot accepting standard Omron SD memory cards or CF cards via adapter for program transfer and data storage.

• What signal cable shielding method is required for serial option board interfaces?

  Use 360-deg braid-shielded twisted-pair cables with low-impedance ground connections made directly to the panel enclosure earth bus.