The Omron NJ101-1000, also cataloged as the NJ101-1000 Sysmac NJ1 CPU, operates as a dedicated hardware component for real-time motion control and sequence execution within Sysmac automation architecture platforms. It features a primary task cycle time of 1 ms and manages up to 2 synchronous axes (6 total axes including virtual). Equipped with 0.5 MB variables memory, embedded EtherCAT Master, EtherNet/IP, and USB interfaces, it coordinates system execution across CJ I/O bus expansion units and up to 64 remote I/O nodes.

Model Number Code Structure

• NJ101: Sysmac NJ1 controller architecture baseline model.
• 1000: Core functional hardware profile with database connectivity support.

Technical Performance Metrics

Deterministic Architecture & Bus Integration

The CPU unit manages cyclic motion tasks over EtherCAT deterministic networks while handling upstream plant data via EtherNet/IP. Backplane bus communication velocity across the local CJ I/O bus allows seamless scaling for high I/O density configurations without degrading execution loops. System stability and long-term deployment compatibility are maintained via strict firmware flash compatibility across connected fieldbus couplers and motion drives.

Supply Package Checklist

• 1 x Omron NJ101-1000 Sysmac NJ1 CPU Module
• 1 x Operation Instruction Manual

Field Installation & Wiring Guidelines

• Rack & DIN Installation: Mount the processor onto a standard DIN rail, locking side clips firmly to establish rigid mechanical grounding.
• CJ Bus Coupling: Slide adjacent CJ I/O expansion units together along the side bus connectors until locking levers click fully into place.
• EtherCAT Fieldbus Cabling: Connect Category 5e STP cables to the EtherCAT Master port, grounding cable shielding to eliminate noise.
• Power Supply Connection: Wire a regulated 24 VDC external power supply module directly to the CPU power terminals using short wire runs.
• Port Isolation: Keep RS-232C/422/485 serial communication cabling physically separated from high-voltage AC lines to prevent interference.

Technical Knowledge Base

• Does the NJ101-1000 CPU support hot-swapping of CJ expansion I/O units during operation?

  No. Main system power must be disconnected before removing or adding modules on the CJ I/O bus to prevent backplane bus damage.

• What limits apply to the EtherCAT master network synchronization cycle?

  The primary task cycle operates down to 1 ms, delivering synchronized axis positioning for up to 2 real motion axes.

• How does the unit preserve database connectivity records during unexpected power outages?

  System variables and database buffer queues are retained in non-volatile memory, preventing data loss when power is interrupted.

• Can the CPU communicate simultaneously on EtherNet/IP and optional PROFIBUS DP networks?

  Yes. The onboard EtherNet/IP port operates independently alongside optional communication cards installed on the system rack.

• What cable specifications are mandatory for EtherCAT Master port connections?

  Industrial Grade Category 5e or higher double-shielded twisted-pair (STP) Ethernet cables with RJ45 metal connectors must be used.

• How are firmware updates flashed to the controller module?

  Firmware flash compatibility procedures are executed using Sysmac Studio software connected via the onboard USB or EtherNet/IP port.

• What happens when the maximum limit of 64 remote I/O nodes is exceeded?

  The controller generates a bus configuration error during startup and halts network initialization until node counts match limits.

• Does the CJ I/O bus require end cover terminators?

  Yes. The right-hand end of the CJ expansion rack requires a dedicated end cover to terminate the internal backplane bus correctly.