Omron CJ1W-NC471 4-Axis Position Control Unit for CJ Series PLCs

Product Overview

The Omron CJ1W-NC471 is a high-performance position control unit (PCU) designed for the CJ series programmable logic controllers. It can control up to four axes of servo or stepper motors independently or with coordinated motion. The module supports pulse train output (open collector or line driver) and can perform linear interpolation, circular interpolation, and electronic gearing. The NC471 is ideal for applications such as pick-and-place machines, XYZ tables, and packaging equipment. It is part of Omron's motion control family, enabling integration with standard CJ PLC architecture.

Key Features of CJ1W-NC471

The module provides two pulse output types: 24 V DC open collector (max 200 kHz) or line driver (max 500 kHz). It includes dedicated inputs for home limit sensors, external interrupts, and encoder feedback (for closed-loop operation). The NC471 supports 16 to 20 bits of positioning data per axis and can store up to 500 position sequences. It features multiple operating modes: direct positioning, interpolation, speed control, and torque control (with analog option). The unit includes a built-in programmable acceleration/deceleration (trapezoidal or S-curve). It communicates with the CJ CPU via the backplane bus and can be programmed using CX-One software with dedicated motion function blocks.

The CJ1W-NC471 has a compact size (1 slot) and requires a 24 V DC external power supply for I/O circuits. It includes LED indicators for power, run, error, and axis status. The unit is equipped with a front connector for all I/O wiring (50-pin ribbon cable to a terminal block). It operates in temperatures 0-55°C. The module is compliant with CE and UL standards.

Technical Specifications

• Manufacturer: Omron Corporation

• Part Number: CJ1W-NC471

• Series: CJ1W (CJ series)

• Product Type: Position Control Unit (4 axes)

• Output Type: Open collector (24 V DC, 200 kHz) or line driver (5 V, 500 kHz)

• Number of Axes: 4

• Control Methods: PTP, linear interpolation, circular interpolation, electronic gear

• Positioning Data: 500 sequences per axis

• Acceleration/Deceleration: Trapezoidal, S-curve

• Feedback Inputs: Differential encoder (for closed loop)

• Dedicated Inputs: Home, limit+, limit-, interrupt per axis

• Power Supply: 24 V DC external (for I/O), 5 V DC from backplane

• Current Consumption: 250 mA (5 V), 40 mA (24 V)

• Operating Temperature: 0 to +55 °C

• Degree of Protection: IP20

• Dimensions (W x H x D): 35 mm x 90 mm x 85 mm

• Certifications: CE, UL, CSA

Functional Description

The CJ1W-NC471 receives positioning commands from the CJ CPU via special data registers. It then generates pulse trains to drive servo/stepper amplifiers. The unit can execute homing sequences using the home and limit inputs. It supports coordinated motion: for example, two axes can perform linear interpolation to move a tool along a straight line. The encoder feedback inputs allow the module to close the position loop for increased accuracy. The unit also has a "direct operation" mode where the CPU writes a target position and speed, and the module immediately starts motion without pre-stored sequences.

Applications

The CJ1W-NC471 is used in automated assembly machines, semiconductor handling systems, labeling machines, and CNC routers requiring up to 4 axes of positioning control from a single PLC slot.