Configured for logic execution and centralized system processing in CJ Series backplane assemblies, the Omron CJ1M-CPU11 (CJ1M-CPU11) CPU Unit provides direct physical/electrical execution.

Model Variant & System Structure

• Base Controller: CJ1M-CPU11 central processing unit operating without expansion racks.
• I/O Capacity: Supports up to 160 local I/O points across a maximum of 10 mountable units on the CPU rack.
• Memory Architecture: Integrated 5K-step program memory alongside a dedicated 32K-word Data Memory (DM) block. No Expansion Data Memory (EM) capacity is provided on this hardware revision.

Performance Specifications

Deterministic Backplane Communication & Execution

The internal architecture relies on optimized backplane bus communication velocity Licences to maintain synchronous signal processing across attached I/O units. High-density digital and analog modules interfacing through the local backplane leverage dedicated DMA mechanisms, eliminating scan-time overhead during heavy data transfers. Firmware flash compatibility ensures uniform instruction execution and timing predictability during high-speed sequential control routines.

Package Contents

• 1 x Omron CJ1M-CPU11 Central Processing Unit
• 1 x End Cover (CJ1W-TER01 required for backplane bus termination)
• 1 x Instruction sheet and terminal cover set

Physical Installation & Cabling Specifications

• Backplane Assembly: Mount the CPU unit directly to the DIN rail or backplane panel as the leftmost component adjacent to the power supply unit.
• Bus Termination: Always secure the right-side end cover onto the last I/O unit on the rack to ensure proper signal reflection termination on the internal bus.
• Grounding Requirements: Connect a dedicated protective earth wire (100 ohm or less grounding resistance) to the system power supply unit terminal to mitigate common-mode noise interference.
• Thermal Management: Maintain a minimum clearance of 20 mm above and below the CPU and adjacent modules to facilitate natural convection cooling across internal components.

Technical Questions & Answers

• What is the basic instruction processing speed for this central processing unit?

  The execution speed for basic ladder logic instructions (such as a standard LD instruction) is 0.1 us per instruction on internal hardware execution loops.

• Does the unit support expansion racks for extended I/O configurations?

  No, this CPU model does not support expansion racks. The maximum system limit is strictly 160 local I/O points across 10 mounted units on the primary CPU rack.

• Is Expansion Data Memory (EM) available on this specific processing model?

  This unit features 32K words of standard Data Memory (DM) only. It does not contain any integrated or expandable EM memory banks.

• How much current does the controller draw from the internal 5 VDC bus?

  The hardware draws a continuous current load of 0.58 A from the internal 5 VDC backplane supply during standard operational states.

• 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?

  The backplane bus circuit remains open, preventing valid logic framing and triggering a system bus error that halts CPU execution.

• Can the internal firmware be updated via field programming connections?

  Firmware operations depend on hardware flash controller compatibility, requiring official Omron programming tools and standard CX-Programmer transfer protocols.

• What grounding precautions must be observed during hardware installation?

  The protective earth terminal must be grounded independently using a heavy-gauge wire to prevent high-frequency noise from inducing CPU memory faults.