Configured for central logic execution and network communications in CJ-Series PLC architectures, the Omron CJ2M-CPU35 (CJ2M-CPU35 CPU Unit) provides direct physical/electrical execution.

Technical Identifier Matrix

• Base Model: CJ2M-CPU35
• CPU Family: CJ2M CPU Series
• Network Capability: Integrated EtherNet/IP Port
• Expansion Limit: Max. 3 Expansion Racks
• Peripheral Port: USB 2.0 (Type-B)

Hardware Specifications

Backplane Bus Velocity and EtherNet/IP Determinism

The Omron CJ2M-CPU35 features an integrated backplane bus architecture designed to execute basic instructions within 0.04 us, minimizing internal cycle scan delays across high-density I/O point configurations. The embedded EtherNet/IP controller processes implicit I/O data links and explicit message communications without degrading central logic scan execution. Operating over standard IEEE 802.3 Ethernet transport layer, the integrated EtherNet/IP port supports cyclic data tags and CIP safety/data routing across factory networks. Backplane data exchange latency between the CPU and expansion units remains optimized via dedicated DMA bus transactions, maintaining deterministic scan timing when managing up to 40 local or expansion I/O modules across 3 expansion racks.

Package Contents & Ordering Information

• 1x Omron CJ2M-CPU35 CPU Unit
• 1x CJ1W-TER01 Backplane End Cover
• 1x Instruction Sheet

Field Installation Guidelines

• DIN Rail Mounting: Hook the top CPU notch onto the DIN rail and snap the bottom lock mechanism into place. Ensure the unit is physically secured between the power supply unit and adjacent I/O modules.
• End Cover Installation: Always attach the CJ1W-TER01 end cover to the rightmost module slot on the backplane rail. Operating without the end cover prevents correct backplane bus signal termination.
• Grounding: Connect the Functional Ground (FG) terminal of the adjacent power supply module to an isolated earth ground line using 2.0 mm sq or larger conductor wire.
• EtherNet/IP Cabling: Utilize Category 5e or higher STP (Shielded Twisted Pair) cables with 360-deg braid shielding and RJ45 connectors to minimize EMI interference.

Frequently Asked Questions

• What is the current consumption rating for the CJ2M-CPU35 module?

  The CPU unit draws 0.7 A at 5 VDC directly from the internal backplane bus power supply.

• How many total I/O points can the CJ2M-CPU35 control?

  The controller manages up to 2,560 I/O points across a maximum of 40 Units spread over 3 expansion racks.

• What basic instruction execution latency does the CPU achieve?

  Basic LD instruction execution timing is 0.04 us.

• Does the CJ2M-CPU35 support hot-swapping under live power?

  No, Omron CJ-series modules do not support hot-swapping. System power must be isolated prior to insertion or removal.

• What communication interface is built directly into the front panel?

  The CPU features a built-in EtherNet/IP RJ45 port and a USB 2.0 Type-B peripheral port for programming.

• How is the internal data memory structured on this unit?

  Total capacity is 160K words, structured as 32K words in Data Memory (DM) and 4 banks of Extended Memory (EM) at 32K words each.

• What shielding method is recommended for the EtherNet/IP port wiring?

  Use Category 5e STP cables with 360-deg braid shielding bonded to metal RJ45 connector shells for noise suppression.

• What firmware flash compatibility requirements apply to option boards?

  Option boards inserted into the option slot must match the system firmware revisions detailed in the CJ2M functional manual.