Configured for multi-axis coordinated motion control and sequence execution in Sysmac automation architectures, the Omron NJ301-1200 (NJ301 Machine Automation Controller CPU) provides direct physical/electrical execution. It manages up to 8 motion control axes across an I/O capacity of 2,560 points across 40 expansion units. Featuring 5 MB program memory and 2.5 MB total variable memory, the controller executes deterministic instruction loops across local expansion racks while providing internal memory retention during unexpected system power interruptions.

Part Number Breakdown

• NJ301: Baseline processor class within the Sysmac NJ machine controller architecture.
• 1: Motion control capability tier for multi-axis motion synchronization routines.
• 2: Motion axis scaling hardware capacity supporting up to 8 control axes.
• 00: Standard CPU module configuration without embedded specialty database interfaces.

Hardware Specifications

Deterministic Network Routing & Backplane Execution

The controller processes high-speed motion loops while routing data across Profinet / EtherNet/IP deterministic networks. Ultra-fast backplane bus communication velocity coordinates signal flow across attached local rack modules without CPU processing delays. This high I/O density scaling capacity preserves real-time interpolation performance while ensuring broad firmware flash compatibility across network bus couplers and drive peripherals.

Package Delivery Contents

• 1 x Omron NJ301-1200 CPU Unit
• 1 x Rack End Cover
• 1 x Operations Reference Manual

Panel Installation & Field Wiring Rules

• Control Panel Mounting: Secure the controller inside an enclosed IP54-rated cabinet to protect against airborne conductive contaminants and dust.
• System Grounding: Connect the dedicated ground terminal directly to a low-impedance panel ground bus (ground resistance under 100 ohms).
• Expansion Rack Assembly: Lock adjacent CJ-series expansion units together using side connectors and slide the locking levers to full engagement.
• End Cover Fitting: Always install the supplied bus end cover on the rightmost expansion module to ensure proper backplane termination.
• Signal Separation: Route low-voltage motion network cables in separate wire raceways at least 100 mm away from high-voltage AC motor lines.

Technical FAQ

• Does the NJ301-1200 CPU support live module replacement on active expansion racks?

  No. You must completely isolate main AC/DC power before installing or removing expansion units to prevent hardware damage.

• What happens to memory variables when operating power is disconnected?

  Retained variables (0.5 MB capacity) are preserved via battery backup; non-retained variables (2.0 MB) reset to default values.

• What grounding requirement must be met for panel installation?

  The protective earth terminal must be connected to a dedicated ground point with a ground resistance of less than 100 ohms.

• How is backplane bus termination ensured on CJ expansion racks?

  The CPU includes a dedicated End Cover that must be locked onto the last module to ensure proper backplane bus signal termination.

• What current draw does the CPU impose on the 5 VDC internal power bus?

  The CPU unit draws up to 1.90 A at 5 VDC from the power supply module, including power consumed by an SD Memory Card.

• How does the unit react under extreme mechanical vibration?

  The housing withstands 5 to 8.4 Hz with 3.5 mm amplitude and 8.4 to 150 Hz at 9.8 m/s2 acceleration per IEC 60068-2-6.

• What is the expected lifespan of the internal backup battery?

  The backup battery maintains memory retention for 5 years at an ambient operating temperature of 25 deg C before replacement is needed.

• What is the maximum physical expansion limit for local I/O units?

  The CPU controls up to 40 expansion units distributed across a maximum of 3 expansion racks, totaling 2,560 I/O points.