Digitax HD M751 Base
Servo AC Drive
1.5 A – 16 A with 48 A peak
200 V 400 V | 0.25 kW - 7.5 kW
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Configuration flexibility with option modules

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

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. Analogue 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


    Maximum performance

    • 300% peak current performance pulse-duty overload
    • Optimised 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
    • Analogue 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 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 customisation (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

    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.



      Connect - intuitive commissioning software
    Connect is our latest drive configuration tool for commissioning, optimising and monitoring drive/system performance.
    machine-control-studio-icon  Machine Control Studio - programming tool
    Control Techniques' Machine Control Studio provides a flexible and intuitive environment for programming new automation and motion control features.



    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.

    ORDER CODE: 82400000019600

    KI Compact Display Option module for servo drive
    KI-Compact Display
    The display (fitted on M753, 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. 

    ORDER CODE: 82700000020400

    KI-Compact 485 Adaptor
    This allows the drive to communicate via RS485. This is commonly used for programming if a keypad or KI-Compact Display is not ordered with the drive.

    ORDER CODE: 82700000020300

    Integration Products

    Remote I/O
    Industrial control applications typically use a PLC system to manage the process; using I/O to provide an interface to switches, relays and sensors attached to the machine.

    RTMoE & MODBUS TCP Network Adapter ORDER CODE - IO210-BC

    EtherCAT Network Adapter ORDER CODE - IO211-BC

    System Integration Modules - Feedback

    Quadrature encoder input interface module.

    ORDER CODE: 82400000018100

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

    ORDER CODE: 82400000018300

    System Integration Modules - Communications

    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.

    ORDER CODE: 82400000017500


    SI-POWERLINK serves applications ranging from simple open-loop systems through to those demanding precise motion control.

    ORDER CODE: 82400000021600

    SI-Devicenet Communications System Integration Module

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

    ORDER CODE: 82400000017700

    SI-CANopen Communication System Integration Module

    SI-CANopen interface module supports various profiles, offering optimum flexibility.

    ORDER CODE: 82400000017600

    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. 

    ORDER CODE: 82400000017900

    SI-EtherCAT Communications System Integration Module

    SI-EtherCAT allows the drive to connect and interface with EtherCAT networks.

    ORDER CODE: 82400000018000

    SI-Profinet Communications System Integration Module  SI-PROFINET
    SI-PROFINET allows the drive to communicate and interface with PROFINET PLCs and networks.

    ORDER CODE: 82500000018200


    SI-INTERBUS 500kBd

    SI-INTERBUS 2MBb               

    SI-INTERBUS for easy integration to the Interbus fieldbus in applications that use or drives

    ORDER CODE: 82400000021220

    ORDER CODE: 82400000021230

    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 Analogue inputs (default)/Digital inputs, 1 x Analogue output (default)/Digital input, 2 x Relays.

    ORDER CODE: 82400000017800

    SI-I/O 24 plus
    The SI-I/O 24 Plus option module provides a plug in high density I/O expansion solution for Unidrive and Digitax HD. Features include:
    16 x Digital Inputs (8 high speed), 8 x Digital Outputs and an Incremental Encoder Input (AB Servo).
    A High Density DIN rail mounted screw terminal breakout board and cable is available to provide easy connection to the module.

    System Integration Modules - Applications

    SI-Apps Compact
    Compatible module allows SyPTPro application programs to be re-complied for HD.

    ORDER CODE: 82400000020700

    MCi200 system integration module
    Second processor, providing advanced customization using industry standard IEC61131-3 programming languages.

    ORDER CODE: 82400000017000

    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.

    ORDER CODE: 82400000016700

    PTi210 PowerTools Integration Module
    PTi210 allows setup of complex servo motion control applications within minutes

    ORDER CODE: 82400000021400

    System Integration Modules - Safety



    MiS250 safety option extends the built-in STO with motion safety capability and enables decentralised flexibility with the option of safety over ethernet connectivity.

    To find out more, visit our Functional Safety page.

    ORDER CODE: 82400000021100

    Optional Accessories

    RS485 USB Communication Cable
    USB to EIA485 Communications Converter Cable
    The USB comms cable allows the drive to connect to a PC for use with our PC tools*.

    ORDER CODE: 4500-0096

                     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.

    * Also requires KI-Compact-485 adaptor


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