Delta Tau PMAC-2-ACC8E – Robust field I/O interface for PMAC2/UMAC motion control systems

The PMAC-2-ACC8E is a proven Delta Tau accessory board that brings clean, protected field signals into a PMAC2 or UMAC rack. From my experience, it’s the card you pick when you need reliable 24 V industrial I/O tied directly to a Turbo PMAC2 CPU without messy external adaptors. You might notice that wiring gets simpler, noise issues go down, and commissioning becomes more predictable—especially on machines with lots of limit switches, home sensors, interlocks, and general digital points.

Typical use cases include packaging lines, CNC retrofits, electronics assembly, and semiconductor tools where you want opto-isolated I/O between the controller and the machine. The board seems to be most effective when you’re consolidating field wiring in a control cabinet and need solid diagnostics and protection on each channel.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express delivery options: FedEx, UPS, DHL

Key Features

• Opto‑isolated 24 V digital I/O – Typically used for limit, home, E‑stop, interlock and general machine signals to protect the PMAC bus from transients.
• Direct PMAC2/UMAC backplane interface – No external communication driver; it plugs into the rack so latency stays low and configuration stays simple.
• Clean field wiring – Terminals or headers (varies by build) that reduce wiring clutter and make cabinet layout easier.
• Noise immunity – Isolation and filtering that, in many cases, cut down false triggers on long field runs.
• Status indication – On‑board LED indication on channels (common on these boards) helps quick troubleshooting during commissioning.
• PMAC firmware compatibility – Works with standard PMAC I/O mapping so you can keep your existing motion code and variable assignments.
• Industrial cabinet friendly – Designed for control cabinets with typical 24 VDC field power, grounding, and shielding practices.

Technical Specifications

Notes: Channel counts and connector style can vary with board build options. If you need a precise BOM or pinout, share your rack CPU model and we’ll match revisions before shipping.

Related or Supporting Products

• Delta Tau ACC-11E – 24 V digital I/O module used when you need additional isolated inputs/outputs beyond ACC8E.
• Delta Tau ACC-14E – TTL-level digital I/O card; useful for low-voltage logic interfacing rather than 24 V field signals.
• Delta Tau ACC-24E2A – Multi-axis servo interface; pairs with PMAC2 CPU for analog servo drives and encoder feedback.
• Delta Tau ACC-24E3 – Newer-generation servo interface with enhanced feedback options; good for high-resolution feedback.
• Delta Tau ACC-65E – Analog input (ADC) expansion for process monitoring or sensor acquisition alongside digital I/O.
• Delta Tau ACC-66E / ACC-68E – Analog output (DAC) options for motion/valve control when you need precise analog actuation.
• Turbo PMAC2 CPU / UMAC Rack – Required host platform; the ACC8E interfaces through this backplane to your motion program.

Quick customer note: “We swapped to PMAC-2-ACC8E on a packaging cell and the false trips on our long sensor runs basically disappeared. Diagnostics LEDs saved hours during startup.”

Installation & Maintenance

• Cabinet & ventilation – Install in a clean, dry control cabinet with ambient 0–55 °C and adequate airflow. Keep high-voltage and motor power cables routed away from I/O harnesses.
• Grounding & shielding – Bond rack ground to cabinet PE; use shielded cables for long runs; land shields on the cabinet side to reduce noise loops.
• Wiring – Use 24 VDC field power with appropriate fusing. Separate input and output commons as recommended. Verify polarity before applying power.
• Safety – De-energize cabinet before servicing. Observe ESD handling when inserting/removing boards. Verify E‑stop circuits to applicable machine safety standards.
• Routine checks – Re‑torque terminal screws after thermal cycles, inspect for damaged conductors, and clean dust with dry air. Digital I/O typically requires no calibration.
• Firmware & mapping – Keep PMAC firmware current on the CPU and back up I/O mapping. After any hardware change, confirm bit mapping and interlock logic.

Quality & Certifications

• CE and RoHS compliant in most configurations; components commonly UL recognized
• Manufacturer-grade build with industrial temperature ratings typical for control cabinets
• Backed by our 365-day warranty and full functional testing before dispatch