ABB 086318-002 / 086318-501 – Legacy I/O Termination Assembly for ABB Bailey INFI 90 / NET 90 Cabinets

The ABB 086318-002 and 086318-501 are legacy termination/interface assemblies commonly used to bridge controller I/O to field wiring in ABB Bailey INFI 90 and NET 90 systems. From my experience, these part numbers are selected as form-fit-function replacements to keep mature DCS cabinets running with minimal rewiring. They’re practical for like-for-like maintenance, phased migrations, or adding spare capacity where the original termination format must be preserved.

• Form-fit compatibility – Typically matches the legacy Bailey termination footprint and field wiring layout, cutting downtime during swap-outs.

• Passive design – No dedicated power required; reduces failure points and eases troubleshooting in most cases.

• Clean field marshalling – Screw or plug terminals (per revision) help organize digital and analog channels neatly.

• Controller harness interface – Designed to connect via factory harness/cable to the corresponding I/O module as per ABB Bailey conventions.

• Service-friendly labeling – Clear channel markings and typical test-access points make loop checks faster for maintenance teams.

• Drop-in replacement strategy – Ideal for systems where you want to avoid wholesale rewiring or cabinet rework.

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You might notice that these assemblies remain common in facilities where ABB Bailey systems are still the backbone of control. Typical use cases include:

• Power generation (coal, gas, combined cycle) — sustaining existing I/O cabinets during outages

• Oil & gas and refining — maintaining legacy marshalling while planning phased upgrades

• Chemicals and petrochemicals — minimizing downtime where regulatory loops can’t be disturbed

• Pulp & paper, metals, mining — like-for-like replacements to avoid field rewiring

• Utilities and water — standardizing spare parts across multiple older substations or plants

• Reduced retrofit effort – Reuse existing wiring pathways and tags; typically no field-side re-termination.

• Lower risk – Passive hardware means fewer compatibility surprises and straightforward loop checks.

• Lifecycle continuity – Extends the viable life of ABB Bailey control rooms while upgrade plans are finalized.

• Support-friendly – Technicians familiar with INFI 90 practices can service these without new tools or training.

• Cost control – Avoids large capital work by enabling targeted replacements during scheduled stops.

• Environment – Install in a clean, dry control cabinet with adequate ventilation; keep within the DCS system’s specified temperature/humidity.

• Mounting – Verify hole pattern and standoff height by revision (-002 vs. -501 can differ). Keep harness bend radius gentle.

• Wiring – Isolate power, tag and verify each loop, and torque terminals to manufacturer-recommended values. Maintain shield terminations per site standards.

• Safety – Observe ESD procedures and lockout/tagout. Confirm correct part pairing before energizing I/O.

• Routine checks – Periodically re-torque terminals, inspect for oxidation, clean dust with dry air, and verify channel labeling after any cabinet work.

• Documentation – Match the board to your I/O module part numbers and cabinet wiring diagrams; keep a spare on the shelf for critical loops.

• Manufacturing pedigree – Built to ABB’s industrial quality standards for legacy DCS hardware.

• Compliance – Typically used within CE/UL certified system assemblies; exact approvals may vary by revision—consult the official datasheet for confirmation.

• RoHS/Material status – Legacy spare; material declarations can depend on manufacturing date.

• Warranty – Standard 12?month limited warranty from shipment on normal industrial use (terms may vary by supply source).

• Controller harness/cable assemblies matched to your I/O module series (avoid mixed revisions where possible).

• Terminal covers and markers for channel labeling and touch safety inside the cabinet.

• Spare standoffs and mounting hardware for quick swap during outages.

• Documentation pack: wiring map printouts and loop sheets aligned to the 086318-002 / 086318-501 terminal layout.

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If you can share your cabinet photos or the paired I/O module part numbers, we can double-check whether 086318-002 or 086318-501 is the better match. In many cases, the physical revision and harness pinout decide it.