M68‑2000 – Two‑Axis Motion Controller Hardware for CNC and Servo Systems

The M68-2000 is a dedicated two-axis motion controller hardware module designed for use in servo-based CNC and positioning systems. Developed by SCE SERVO CNC, this device provides precise trajectory generation, real-time interpolation, and advanced feedback management for multi-axis motion applications. Version HW 2.0 incorporates improved processing power and enhanced connectivity, making it a reliable foundation for demanding machine control.

Hardware Architecture

The M68-2000 features a high-speed DSP core with dual-axis dedicated circuitry, enabling independent or coordinated motion control. It supports both incremental and absolute encoders with A/B/Z signals, and accepts analog ±10 V or digital step/direction command inputs from a host controller. The board is equipped with 16 optically isolated digital inputs and 8 digital outputs for limit switches, emergency stops, and general-purpose signaling.

Motion Control Capabilities

The controller performs linear and circular interpolation, trapezoidal and S-curve acceleration/deceleration, and electronic gearing for synchronized axes. The maximum pulse output frequency is 4 MHz, suitable for high-speed servo drives. Position resolution is programmable down to 1 µm, ensuring high precision in machining, cutting, and assembly operations. The built-in motion buffer allows pre-storage of up to 1000 blocks for smooth continuous path execution.

Communication Interfaces

Two RS-422 serial ports and one USB device port are provided for programming and data exchange. An optional Ethernet module supports Modbus TCP and custom protocols for integration with SCADA systems. The M68-2000 can also interface with a host PLC via parallel I/O or fieldbus, facilitating hybrid control architectures.

Power and Environmental Ratings

The unit operates from a 24 V DC supply with a current consumption of 2 A. It is rated for ambient temperatures from 0 °C to 50 °C and is designed for installation in control cabinets with forced ventilation. The hardware meets CE and FCC electromagnetic compatibility requirements.

Typical Applications

Common deployments include CNC milling machines, laser cutting tables, welding robots, pick-and-place systems, and semiconductor handling equipment. The M68-2000's compact form factor and flexible configuration options make it suitable for both OEM machinery and retrofit projects.

Setup and Diagnostics

Configuration is performed using dedicated PC software that allows tuning of PID parameters, setting of software limits, and monitoring of real-time position and velocity data. On-board diagnostics include LED status indicators for each axis, communication activity, and error conditions. A watchdog timer ensures system safety in case of communication loss.

In summary, the M68-2000 motion controller hardware delivers high-performance, reliable two-axis control that meets the rigorous demands of modern CNC and servo-driven machinery.