ACC-24E2A
ACC-24E2A
ACC-24E2A

Delta Tau ACC-24E2A | Turbo PMAC2 Accessory Board

  • Brand:​ Delta Tau Data Systems
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    Model:​ ACC-24E2A
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    Product Type:​ Turbo PMAC2 Accessory Board
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    Series:​ Turbo PMAC2
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    Core Function:​ Provides 2-axis analog servo interface with encoder feedback for motion control systems.
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    Key Specs:​ 2 servo channels, ±10V analog output, 4x encoder inputs, 24-bit resolution.
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Part number: ACC-24E2A
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Description

ACC-24E2A: Product Overview
The Delta Tau ACC-24E2A is a servo interface accessory board designed for the Turbo PMAC2 motion controller platform, providing high-performance analog servo control for precision motion applications. This board serves as an interface between the Turbo PMAC2 motion controller and analog servo drives, converting digital motion commands from the controller into analog voltage signals for drive control while processing encoder feedback for closed-loop position control. The module operates within the Turbo PMAC2 system architecture, extending the controller’s capability to manage additional servo axes beyond its built-in capacity.
Installed as an accessory to the main Turbo PMAC2 CPU board, this interface handles two independent servo channels, each capable of generating ±10V analog command signals to drive servo amplifiers. The board processes quadrature encoder feedback with 24-bit resolution, providing precise position tracking for high-accuracy motion applications. Each channel supports multiple feedback types including incremental encoders, absolute serial encoders, and resolver interfaces, making it suitable for various motor and feedback device configurations. The architecture includes dedicated processing for servo loop closure, offloading computational burden from the main CPU while maintaining tight synchronization with other axes in multi-axis coordinated motion systems.
As part of the Turbo PMAC2 product family, this accessory board integrates seamlessly with the platform’s motion control capabilities, supporting advanced features such as electronic gearing, cam profiling, and coordinated multi-axis interpolation. The system maintains deterministic update rates for servo loops, typically operating at 4 kHz or higher depending on configuration, ensuring stable and responsive motion control. This integration allows engineers to scale motion control systems by adding axis capacity while maintaining consistent performance characteristics across all controlled axes.

ACC-24E2A

ACC-24E2A

ACC-24E2A: Technical Specifications
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    Model Number:​ ACC-24E2A
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    Manufacturer:​ Delta Tau Data Systems
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    Product Type:​ Turbo PMAC2 Accessory Board
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    Number of Axes:​ 2 independent servo channels
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    Analog Output:​ ±10V differential, 16-bit resolution
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    Encoder Inputs:​ 4 channels per axis (A, B, C, D)
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    Encoder Resolution:​ 24-bit position resolution
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    Maximum Count Rate:​ 20 MHz
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    Feedback Types:​ Incremental encoder, absolute serial encoder, resolver
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    Servo Update Rate:​ Configurable up to 44 kHz
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    Communication Interface:​ Parallel bus to Turbo PMAC2 CPU
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    Power Supply:​ +5V DC from host controller
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    Operating Temperature:​ 0°C to 60°C
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    Storage Temperature:​ -40°C to 85°C
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    Connector Type:​ 50-pin high-density D-sub
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    Isolation:​ 500V optical isolation on encoder inputs

    ACC-24E2A

    ACC-24E2A

Core Features & Customer Value
High-Resolution Motion Control: The 16-bit analog output resolution combined with 24-bit encoder feedback provides precise command signal generation and accurate position tracking. This high resolution enables smooth motion profiles with minimal quantization effects, particularly important for applications requiring fine velocity control or precise positioning at low speeds. The benefit for machine builders is improved motion quality and positioning accuracy, reducing settling times and increasing throughput in precision automation applications.
Flexible Feedback Integration: Support for multiple feedback types allows the interface to work with various motor and encoder technologies without requiring additional signal conditioning hardware. The ability to handle incremental encoders, absolute serial encoders (such as EnDat, BiSS, or SSI), and resolver inputs provides system integrators with flexibility in component selection and simplifies retrofitting of existing equipment. This flexibility reduces engineering time and component costs when designing or upgrading motion systems.
Deterministic Servo Performance: The dedicated processing architecture ensures consistent servo update rates independent of the main CPU’s computational load. This deterministic behavior provides stable servo control essential for high-performance applications involving high gains, stiff mechanics, or complex motion profiles. For applications such as CNC machining or electronic assembly, this stability translates to better surface finishes, higher placement accuracy, and reduced mechanical vibration.
Typical Applications
In CNC machine tools, the interface controls servo drives for axis motion, providing precise analog command signals to spindle drives and linear motor amplifiers while processing high-resolution encoder feedback for accurate position control. The board works in conjunction with the main Turbo PMAC2 controller to execute complex interpolation moves for multi-axis contouring operations.
For semiconductor manufacturing equipment, the module controls precision stages in wafer handling and inspection systems, providing the smooth motion profiles and sub-micron positioning accuracy required for semiconductor processing. The high-resolution analog outputs ensure minimal velocity ripple during critical process steps such as photolithography or wafer inspection.
In packaging machinery, the interface manages servo axes for filling, capping, and labeling operations, supporting electronic cam profiles for synchronized motion between product transport and processing stations. The deterministic update rates ensure precise timing coordination between multiple axes operating at high production speeds.

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