The Omron CJ1M-CPU11-ETN, also cataloged as the CJ1M-CPU11-ETN CPU Unit, operates as a dedicated hardware component for centralized programmable logic execution and direct network communication within Omron CJ1 Series automation platforms. Configured with built-in Ethernet functionality, this unit handles digital input/output mapping, instruction sequencing, and system memory management without requiring a separate communication module.

Technical Identifier Matrix

Hardware Specifications

PLC Backplane Bus Velocity and Ethernet Determinism

The CJ1M-CPU11-ETN integrates a high-speed system bus directly to the CPU backplane, enabling direct data transfer between the processor and up to 10 mountable I/O units. Internal cycle execution for basic logic instructions runs at 0.10 microseconds, minimizing overall scan times. The integrated Ethernet port operates as a dedicated network interface directly accessing the memory address space (32K words DM) via FINS (Factory Interface Network Service) protocol commands. Network data processing is decoupled from main program scan cycles to maintain fixed execution timing while handling socket services, IP routing, and peer-to-peer messaging.

Package Contents & Ordering Information

• 1x Omron CJ1M-CPU11-ETN CPU Unit
• 1x End Cover (CJ1W-TER01 required for backplane termination)
• 1x Quick Reference Manual Document

Field Installation Guidelines

• Mounting Configuration: Mount the unit directly onto a standard 35 mm DIN rail. Secure the CPU unit to the power supply module located at the leftmost position of the rack.
• Backplane Termination: Always attach the CJ1W-TER01 End Cover to the rightmost I/O unit on the rack. The CPU backplane bus will not execute logic if the end cover is missing.
• Ethernet Cabling: Use Category 5 or higher shielded twisted-pair (STP) Ethernet cable for connection to the RJ-45 port. Ensure maximum cable segment length does not exceed 100 meters.
• Grounding & Shielding: Connect the functional ground (FG) terminal on the adjacent power supply unit to a dedicated ground point with a ground resistance of less than 100 ohms. Connect the RJ-45 cable shield to the network ground topology to suppress high-frequency noise.

Frequently Asked Questions

• What is the maximum physical I/O capacity supported by the CJ1M-CPU11-ETN?

  The unit supports a maximum of 160 local I/O points mounted across up to 10 units on a single CPU rack without expansion racks.

• What protocol does the integrated Ethernet port use for data transfer?

  The built-in Ethernet interface supports FINS UDP/IP and TCP/IP protocols, standard socket services, and FTP server functions.

• Does the CJ1M-CPU11-ETN support expansion racks for additional I/O?

  No, the CJ1M-CPU11-ETN does not support expansion racks. Total hardware capacity is restricted to the 10 units attached directly to the main CPU rack.

• What is the execution speed for standard logic instructions?

  Basic instructions such as LD (Load) execute in 0.10 microseconds, providing fast scan cycle throughput for logic operations.

• How is user program memory allocated in this model?

  The unit provides 5K steps of program capacity and 32K words of Data Memory (DM). Extended Memory (EM) banks are not available on this CPU model.

• What power supply voltage is required for internal CPU operation?

  The CPU module draws 0.95 A at 5 VDC directly from the CJ1 Series power supply module installed on the same backplane.

• Are hot-swapping procedures allowed for units attached to this CPU?

  No, power to the CJ1 system power supply module must be isolated and completely shut off before removing or inserting any units on the backplane.

• What is the required backplane bus termination component?

  The CJ1W-TER01 End Cover must be installed on the right-hand end of the backplane stack to close the internal bus circuit and allow CPU operation.