Digitax HD M751 Base

Base drive for configuration flexibility

Digitax HD M751 Base

Servo Drives and Motors

1.5 A – 16 A with 48 A peak
200 V 400 V | 0.25 kW - 7.5 kW

Configuration flexibility with option modules

Digitax HD M751 Base servo drive offers configuration flexibility with two option slots for functionality extension and customization.

With built-in RS485 communications, Digitax M751 also features an on-board Advanced Motion Controller for distributed 1.5 axis motion control.

One servo system for ALL your automation needs

Configuration flexibility with option modules

The ultimate flexibility drive for machinery manufactures includes two option slots for functionality extension and customisation. Built-in Modbus RTU over RS485 communications. Onboard Advanced Motion Controller for 1.5 axis motion control. Analog and pulse/direction control for centralised motion. Improved productivity with machine safety.   

Advanced Motion Controller onboard
Advanced 1.5 axes motion controller, key features include 
  • 250 μs cycle time
  • Motion profile generator
  • Electronic gearbox
  • Interpolated cam
  • Homing functions
  • High speed position freeze
    • Features
      Maximum performance
      • 300% peak current performance pulse-duty overload
      • Optimized control loops for high dynamic performance
        • 62.5 μs current loop
        • 250 μs position and speed loop
      • Up to 16 kHz switching frequency
      • Supports a wide range of feedback technologies including Quadrature, SinCos (including absolute), SSI, BiSS, EnDat (up to 4 Mb with EnDat 2.2) and resolvers
      • Maximum performance package with high torque density, low inertia Unimotor hd servo motors
      • Analog and pulse/direction control for centralised motion
      • Advanced 1.5 axes Motion Controller, key features include:
        • Real-time tasks
        • 250 μs cycle time
        • Motion profile generator
        • Electronic gearbox
        • Interpolated CAM
        • 2Homing functions
        • High speed position freeze

      Minimum size
      • 40 mm drive width and option bracket adds 22 mm, providing a highly competitive maximum drive width of 62 mm
      • Reduce cabinet height by directly stacking rows of drives. Patented Ultraflow™ technology expels heat directly outside of the cabinet through the rear of the drive (drive heat dissipation can also be achieved via vents on the top of the drive, as standard).
      • Fits into cabinets just 200 mm deep

      Easy installation and setup
      • DIN rail alignment
      • Kits for easy multi-axis installation
      • Single motor cable and electronic motor name plate for fast set up
      • Seamless motor-drive pairing with Unimotor hd servo motors
      • Easy access pluggable connectors
      • Rapid commissioning with the Unidrive M Connect PC tool and SD cards
      • Machine Control Studio provides a flexible and intuitive environment for programming automation and motion control features
        • Programmable with IEC61131 standard languages

      • Two option slots for functionality extension and customization (see available option modules)
      • Built-in RS485 communications

      Safety on-board
      • Improved productivity with machine safety
        - Integrated dual Safe Torque Off
        - Meets SIL3 (Safety Integrity Level 3) and PLe (Performance Level e)
    • Functional Safety
      Functional Safetyfunctional-safety

      All Digitax HD drives have integrated dual Safe Torque Off (STO) inputs, certified to SIL3 / PLe, providing an elegant and reliable safety solution. 
      The addition of an MiS250 safety option extends the built-in STO with the ability to safely monitor and/or restrict the scope of motion. 
      Safety functions include: STO, SBC, SOS, SS1, SS2, SLS, SSM, SLA, SDI, SLP & SES
      For maximum flexibility in the safety system architecture, the modules support both wired and network safety connections: CIP-Safety on EtherNet/IP and Safety over EtherCAT (FSoE).
      To find out more, visit our Functional Safety page.

    • Options

      Option Modules

      System Integration Modules - Feedback
      SI-Encoder Feedback System Integration Module


      Quadrature encoder input interface module.

      SI-Universal Encoder Feedback System Integration Modules

      SI-Universal Encoder

      Encoder input and output interface supporting Quadrature, SinCos, EnDat and SSI encoders.

      System Integration Modules - Communications
      Connects Unidrive, Commander, Digitax and the Pump Drive families to all POWERLINK networks. SI-POWERLINK serves applications ranging from simple open-loop systems through to those demanding precise motion control. The protocol is based upon standard Ethernet and provides a solution for real-time Industrial Ethernet to satisfy the requirements of industrial automation and process control.

      SI-Profibus Communication System Integration Modules


      SI-PROFIBUS interface module enables follower connectivity. It is possible to use multiple SI-PROFIBUS modules or a combination of SI-PROFIBUS and other option module types to add additional functionality such as extended I/O, gateway functionality or additional PLC features.

      SI-Devicenet Communications System Integration Module


      SI-DeviceNet enables follower connectivity. It is possible to use multiple SI-DeviceNet modules to provide additional functionality.

      SI-CANopen Communication System Integration Module


      Digitax HD's SI-CANopen interface module supports various profiles, offering optimum flexibility.

      SI-Ethernet Communication System Integration Module


      SI-Ethernet can be used to provide high speed drive access, global connectivity and integration with IT network technologies. 

      SI-EtherCAT Communications System Integration Module


      SI-EtherCAT allows Digitax HD servo drive to connect and interface with EtherCAT networks.

      SI-Profinet Communications System Integration Module 


      SI-PROFINET allows Digitax HD to communicate and interface with PROFINET PLCs and networks.



      Interbus interface modules.

      System Integration Modules - Applications

      MCi210 System Integration Module with a dual port Ethernet


      Extended advanced machine control, provides MCi200 functionality with additional ports and simultaneous connectivity to 2 separate Ethernet networks.

      MCi200 system integration module


      Second processor, providing advanced customization using industry standard IEC61131-3 programming languages.

      SI-Apps Compact System Integration Modules

      SI-Apps Compact

      Compatible module allows legacy SyPTPro application programs to be re-complied for HD.

      System Integration Modules - Additional I/O

      SI-IO System Integration Module


      Extended I/O interface module to increase the number of I/O points on a drive. Provides additional: 4 x Digital I/O, 3 x Analog inputs (default)/Digital inputs, 1 x Analog output (default)/Digital input, 2 x Relays.


      KI Compact Display Option module for servo drive

      KI-Compact Display

      The display (fitted on M753 & M750, optional on M751) ensures access to drive diagnostics even in the absence of network connectivity. Includes 2 rotary switches for hardware setting of the node address for faster commissioning of the motion network.


      KI-Compact 485 Adaptor

      This allows the drive to communicate via RS485. This is commonly used for programming if the drive has no keypad.


      Remote Keypad RTC

      The keypad is remote mountable, allowing flexible mounting on the outside of a panel (meets IP54/NEMA 12). Three line plain text, multi-language LCD keypad for rapid set-up and helpful diagnostics. Battery operated real-time clock allows accurate time stamping of events, aiding diagnostics.

      Drive interface units - Communications
      control techniques usb cable

      CT USB Communications Cable

      The USB Communications cable allows the drive to connect to a PC for use with our PC tools*.

      digitax m75c capshare servo

      Digitax M75C CapShare

      Capacitor module (200 V and 400 V) with thermal protection to increase maximum energy storage capacity, and optimise energy efficient usage.


      For the complete list of accessories, please see the Digitax HD brochure.

      * Also requires KI-Compact-485 adaptor.

    • Software
      We make it quick and easy
      Connect - Intuitive Commissioning Software

      Based on Control Techniques’ 25 years' experience, Connect is our latest drive configuration tool for commissioning, optimizing and monitoring drive/system performance.



      Machine Control Studio - Programming Tool

      Control Techniques' Machine Control Studio provides a flexible and intuitive environment for programming new automation and motion control features.



    • Downloads

    Further Information

    Product Data Sheets
    Digitax HD Datasheet
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