CJ1W-NC471 Omron Position Control Unit

The Omron CJ1W-NC471 is a high-performance 4-axis position control unit for the CJ-series PLC platform, featuring MECHATROLINK-II communication for direct digital control of Omron G5 and G-series servo drives. Supporting a rich set of motion functions—such as position, speed, and torque control—this CPU bus unit enables fast, synchronized, and precise servo management directly from the ladder program.

With advanced features like software limits, origin determination, jogging, and backlash compensation, the CJ1W-NC471 provides a compact yet powerful motion control solution for high-speed packaging, material handling, or inspection machines.

Technical Specifications

Model: CJ1W-NC471
Series: CJ1W
Product Type: CPU Bus Position Control Unit
Mounting Type: DIN rail via CJ-series rack
Dimensions (W × H × D): 31 × 90 × 65 mm
Weight (Unpacked): 95 g max
Internal Current Consumption: 360 mA at 5 V DC
Degree of Protection: IP20
Standards Compliance: CE, cULus, C-Tick

System & PLC Integration

• PLC Compatibility: CJ-series
• Unit Classification: CPU Bus Unit
• Unit Number Setting: 0 to F
• I/O Allocation – Common Area: 25 words (15 output, 10 input)
• I/O Allocation – Axis Area: 50 words × number of used axes
• Supported Servo Drives:
  • Omron G5-series (MECHATROLINK-II)
  • Omron G-series (MECHATROLINK-II)

Motion Control Specifications

• Maximum Controlled Axes: 4
• Control Method: MECHATROLINK-II synchronous command execution
• Position Command Range: –2,147,483,648 to +2,147,483,647 units
• Speed Command Range: 0 to 2,147,483,647 units/s
• Acceleration/Deceleration: 10,000 units/s², adjustable 1 to 65,535
• Speed Control Range: –199.999% to +199.999%
• Torque Control Range: –199.999% to +199.999%

Supported Control Functions

• Position Control: Absolute/relative positioning via ladder command
• Speed Control: Command via servo drive speed loop
• Torque Control: Command via servo drive current loop
• Origin Determination: Multiple methods including absolute encoder
• Jogging: Manual pulse output in forward/reverse direction
• Interrupt Feeding: Move a set distance on external interrupt
• Stop Functions: Deceleration stop, Emergency stop
• Auxiliary Features:
  • Trapezoidal, exponential, and S-curve acceleration
  • Override speed adjustment: 0.01% to 327.67%
  • Torque limiting and backlash compensation
  • Software-defined travel limits
  • Real-time monitoring: position, speed, torque
  • Servo lock/unlock control
  • Deviation counter reset (v1.3+)

External I/O Interface

• MECHATROLINK-II Port: 1 port
• Inputs: Forward/reverse limit, origin proximity, 3 × interrupt inputs

Safety & Diagnostics

• Self-Diagnostics: Watchdog, flash/memory corruption check
• Error Detection:
  • Overtravel
  • Servo alarm
  • CPU and unit setting errors
  • MECHATROLINK communication error

MECHATROLINK-II Communication

• Protocol: MECHATROLINK-II
• Baud Rate: 10 Mbps
• Topology: Bus (Master-slave, fully synchronous)
• Max Stations: 30 slaves
• Transmission Distance: Up to 50 m
• Min Distance Between Nodes: 0.5 m
• Cable Type: Shielded twisted-pair
• Transfer Cycle: Configurable from 250 µs to 8 ms
• Encoding: Manchester
• Data Frame: 17 or 32 bytes (selectable)

Key Features & Benefits

✅ 4-Axis Motion Control: Ideal for advanced synchronized applications.

✅ MECHATROLINK-II Interface: High-speed, noise-immune digital communication.

✅ Flexible Motion Modes: Position, speed, torque, and jogging all in one unit.

✅ Integrated Ladder Commands: Easy configuration and operation via PLC.

✅ Full Diagnostics & Monitoring: Real-time access to servo data and alarms.

📦 Available from Drive Outlet Megastore

The Omron CJ1W-NC471 offers complete and precise servo motion control via MECHATROLINK-II in a space-saving CJ-series format.

Need help designing a multi-axis motion system or integrating G5 servos?
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