Delta Tau PMAC2A-ETH 603871-105 Turbo Clipper Controller Board

Technical Dossier

Product Details And Specifications

Delta Tau PMAC2A Series: Comprehensive Module Range and Technical Overview

The Delta Tau PMAC2A (Programmable Multi-Axis Controller, 2nd Generation A-variant) is a high-performance motion control platform deployed across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, semiconductor fabrication plants, and precision CNC machining centers. The PMAC2A architecture supports up to 32 axes of coordinated motion, real-time trajectory generation, and deterministic servo loop closure — characteristics that have made it a reference-grade controller in applications where positional accuracy and system uptime are non-negotiable. The PMAC2A-ETH variant (603871-105) integrates an onboard Ethernet interface, enabling direct TCP/IP communication with supervisory SCADA systems and eliminating the need for a separate communication adapter card. This board remains installed in a significant installed base of legacy automation cells globally, and DriveKNMS maintains dedicated stock and test infrastructure for this series.

The Evolution of PMAC2A Architecture

The PMAC platform originated in the early 1990s as a DSP-based open-architecture motion controller designed to replace proprietary CNC systems. The original PMAC1 used a fixed-point TMS320C25 DSP and supported up to 8 axes. The PMAC2 generation introduced a floating-point DSP (TMS320C40/C44), expanded axis count, and a modular backplane architecture compatible with the ACC (Accessory) card ecosystem. The PMAC2A refined the PMAC2 with improved servo bandwidth, enhanced DPRAM communication, and support for the Turbo PMAC firmware — a real-time operating environment that enabled sub-microsecond interrupt latency and advanced kinematic transformations.

The PMAC2A-ETH (603871-105) represents the Ethernet-integrated variant of this generation, introduced to address the industry shift from RS-232/RS-422 serial communication toward TCP/IP-based plant networks. Compatibility considerations: PMAC2A boards are not pin-compatible with PMAC1 backplanes. ACC cards designed for PMAC2 are generally compatible with PMAC2A slots, but firmware version alignment is required. The Turbo PMAC2 (successor platform) uses a different JTHW connector standard and is not backward-compatible at the hardware level. Sites running PMAC2A controllers must maintain the legacy Turbo firmware branch (v1.9xx series) and cannot migrate to Turbo PMAC2 firmware without hardware replacement.

PMAC2A Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Delta Tau PMAC2A and directly compatible accessory ecosystem. Each entry reflects a discrete hardware function within the motion control architecture.

603871-105 (PMAC2A-ETH): Main controller board with onboard Ethernet, 32-axis capable, Turbo firmware.
603871-101 (PMAC2A): Base controller board, serial communication only, 32-axis capable.
603871-102 (PMAC2A-PC): PC/104 form-factor PMAC2A for embedded panel PC integration.
603871-103 (PMAC2A-PCI): PCI bus host card variant for direct PC backplane installation.
603871-104 (PMAC2A-USB): USB communication interface variant of the PMAC2A base board.
603872-101 (ACC-24E2A): 2-axis analog servo amplifier interface accessory card.
603872-102 (ACC-24E2S): 2-axis stepper motor drive interface accessory card.
603873-101 (ACC-28E): 32-channel digital I/O expansion card, 24VDC compatible.
603874-101 (ACC-34AA): Analog-to-digital input card, 16-channel, ±10V range.
603875-101 (ACC-36E): Encoder conversion unit for differential to single-ended signal conditioning.
603876-101 (ACC-51E): MACRO (Motion and Control Ring Optical) fiber-optic ring network interface.
603877-101 (ACC-65E): Resolver-to-digital converter interface card for resolver feedback axes.
603878-101 (ACC-8D): 8-axis MACRO station drive interface for distributed servo drives.
603879-101 (ACC-14E): Breakout board for PMAC2A J3/J4 axis connectors, screw-terminal format.
603880-101 (ACC-11C): PMAC2A power supply and backplane chassis, 4-slot configuration.
603881-101 (ACC-11E): PMAC2A power supply and backplane chassis, 8-slot configuration.
603882-101 (PMAC2A-Lite): Reduced-axis (8-axis) cost-optimized variant of the PMAC2A base board.
603883-101 (ACC-12V): VME bus interface card for PMAC2A integration into VMEbus crate systems.

Sourcing Hard-to-Find & Obsolete PMAC2A Parts

Delta Tau Data Systems was acquired by Omron in 2015. Following the acquisition, the PMAC2A product line entered end-of-life status, with new unit production discontinued. Omron's successor platform — the CJ2M and NJ/NX series — does not provide a direct hardware migration path for PMAC2A-based systems. As a result, the global installed base of PMAC2A controllers is entirely dependent on the secondary market and specialist distributors for hardware replacement and lifecycle extension.

DriveKNMS maintains a dedicated inventory of PMAC2A boards and compatible ACC cards sourced from decommissioned automation cells, factory overstock, and controlled-environment storage. All units are cataloged by part number, firmware revision, and physical condition grade prior to listing. For end-users operating PMAC2A systems in extended service environments — particularly in nuclear, defense, and continuous-process industries where controller replacement requires regulatory re-qualification — DriveKNMS provides long-lead sourcing, condition reporting, and multi-unit reserve stocking agreements. Inquiries for specific revision levels (e.g., 603871-105 Rev C vs Rev D) are handled on a case-by-case basis with full documentation disclosure.

Quality Control for the PMAC2A Range

PMAC2A boards present specific test challenges due to their multi-layer DSP architecture, DPRAM communication bus, and axis-specific analog servo circuitry. DriveKNMS applies the following verification protocol to all PMAC2A units prior to dispatch:

Power-on functional test: Board is powered via a calibrated bench supply matching the ACC-11C/11E backplane voltage specification (±5V, ±12V rails). Boot sequence and firmware initialization are confirmed via serial terminal output.
DPRAM communication verification: Host PC communication is established via the applicable interface (Ethernet for 603871-105) and DPRAM read/write integrity is confirmed across all address blocks using Delta Tau's PEWIN32PRO2 software.
Axis channel continuity: Each axis connector (J3/J4) is tested for signal continuity on encoder, DAC output, and flag input lines using a purpose-built breakout fixture.
Firmware revision confirmation: Installed Turbo firmware version is read and documented. Units are not reflashed unless specifically requested by the customer.
Thermal soak: Boards are operated at rated ambient temperature for a minimum of 2 hours to screen for latent thermal failures in DSP and SRAM components.
Final inspection: PCB is inspected under magnification for capacitor ESR degradation, solder joint integrity on BGA-adjacent components, and backplane connector pin condition.