GE PACSystems RX3i IC695NIU001-ADAD – Network Interface Unit for Remote RX3i I/O Racks

The IC695NIU001-ADAD is the RX3i Network Interface Unit that lets you run a PACSystems RX3i base as a remote I/O rack over your plant Ethernet network. If you’re expanding I/O without adding another CPU, or migrating older Series 90-30 NIU drops to RX3i, this NIU keeps the architecture clean and the footprint small. The “-ADAD” suffix indicates a later hardware/firmware revision of the IC695NIU001, which in many cases improves stability and diagnostic behavior.

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• Warranty: 365 days
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Key Features

• Remote RX3i rack controller – Acts as the backplane master so your RX3i I/O runs as a remote node without a CPU.
• Ethernet-based integration – Typically used with an RX3i Ethernet module (e.g., IC695ETM001) to connect the NIU rack to your controller network.
• Consistent RX3i ecosystem – Reuse the same RX3i I/O modules, power supplies, and baseplates, which simplifies spares and training.
• Built-in diagnostics – Front-panel status LEDs and controller diagnostics streamline commissioning and fault tracing.
• Migrations made simpler – In many cases it’s a straightforward path when moving distributed I/O from older 90-30 NIUs to RX3i hardware.
• Industrial temperature range – Designed for typical control cabinet environments in process and discrete plants.

From my experience, the IC695NIU001 is a good fit when you need to put I/O where the process happens—mixing areas, packaging lines, utility skids—yet keep your main CPU in a central cabinet. You might notice engineering time drops because the hardware and tooling stay consistent across local and remote racks.

Technical Specifications

Related or Supporting Products

• IC695ETM001 – RX3i Ethernet module (10/100 Mbps, RJ‑45). Commonly paired with IC695NIU001 for network connectivity.
• IC695PSA040 / IC695PSD040 – RX3i power supplies used to feed the NIU and installed I/O modules.
• IC695CHS012 / IC695CHS016 – RX3i universal backplanes (12‑slot / 16‑slot) to suit your I/O count.
• IC693NIU004 – Legacy Series 90‑30 NIU (helpful reference if you’re planning a staged migration to RX3i).
• Standard industrial Ethernet patch cords and managed switches for ring or star topologies, depending on site standards.

A maintenance lead at a beverage plant told us the NIU approach “kept the wiring local and our controller room quiet—swapped to RX3i I/O, reused most of the logic blocks, and the startup was a half‑day job.”

Installation & Maintenance

• Cabinet & environment – Install the RX3i rack in a ventilated control cabinet. Keep ambient typically 0–60 °C and avoid condensation or corrosive atmospheres.
• Mounting – Fix the IC695CHS0xx backplane to DIN rail or panel. Ensure adequate clearance at top/bottom for airflow and cable bend radius.
• Wiring – Use shielded industrial Ethernet where applicable. Segregate power and signal cabling to reduce noise. Bond shields at a single point as per site EMC rules.
• Power-up sequence – Install the power supply, NIU, communications module(s), then the I/O modules. Apply power and verify front-panel LEDs before downloading the project.
• Network configuration – Assign IP addressing and rack identification in your engineering tool. From my experience, keeping a simple addressing scheme by area or skid reduces troubleshooting time.
• Routine maintenance – Check cabinet filters quarterly, re-torque field terminals annually, and export the project backups after changes. Firmware updates can be scheduled during planned downtime.
• Safety – De-energize the rack before inserting/removing modules. Verify that safe states are enforced in the controller during network interruptions.

Quality & Certifications

• CE and UL/cUL listed for industrial control equipment
• RoHS-compliant hardware in most RX3i revisions
• Manufactured under ISO 9001 quality systems
• Warranty: 12 months (365 days)

Note: The IC695NIU001-ADAD is a revisioned variant of the standard IC695NIU001. If you have an existing installation, matching hardware/firmware revisions across nodes can help keep behavior consistent.