ABB 1MRK000284-AAR01 Binary I/O Module – Breaker/Aux Contact Acquisition & DO Drive Spare

Technical Specifications

Main Features and Advantages

16-channel binary density in a compact 1MRK footprint.​ The ABB 1MRK000284-AAR01​ hits the sweet spot for panels that need “a few more BI/BO” without jumping to a full S800 or S900 I/O rack. Sixteen points in a ~0.24 kg package means protection-cubicle designers can tuck BI acquisition (breaker positions, disconnector positions, earth-switch positions, motor-heater run, valve-limit, pushbutton, ESTOP chain) and BO drives (annunciation, alarm relays, spring-charge request, local indication) onto one small board. For retrofit jobs where the relay’s native BI/BO is exhausted, the ABB 1MRK000284-AAR01​ is the natural extension rather than a full I/O rack add-on.Photocoupler isolation against switchyard noise.​ Binary signals in electrical buildings live next to VFDs, breaker switching, CT/VT secondaries, and station-battery transients. The ABB 1MRK000284-AAR01​ applies opto-isolation between channel groups and the system/logic side, so a contactor coil kickback or a breaker-close surge on one channel group doesn’t walk across into the logic or the other groups. For substations and power-plant electrical buildings, that isolation is what keeps “ghost alarms” off the SCADA during switching events.Sub-10 ms responsiveness.​ Although binary contact acquisition doesn’t need millisecond precision the way protection tripping does, <10 ms channel response still matters for interlocks — e.g., “pump run feedback must disappear within one scan before the standby auto-starts,” or “breaker-failure chain needs auxiliary-contact state quickly.” The ABB 1MRK000284-AAR01​ keeps up with typical PLC/relay scan rates and with 800xA/AC800M task classes when mapped over Modbus RTU or backplane.Per-channel LED diagnostics.​ Each of the 16 points carries its own LED (input lit / output active / fault, depending on channel direction), which sounds trivial until you’re on a midnight call trying to tell whether a “breaker-position mismatch” is a bad 52a contact, a broken wire, or the ABB 1MRK000284-AAR01​ DO that drives the annunciation relay. The LEDs let a tech split those cases at the cabinet door in under a minute.Wide-temperature, cabinet-hardened build.​ Rated -25 °C to +70 °C with IP20 and conformal-conscious build, the ABB 1MRK000284-AAR01​ goes into unconditioned electrical buildings, desert solar-yards, and freeze-grade Nordic substations without derating. For fleets that standardize 1MRK spares across multiple sites, one SKU covers the temperate and the extreme sites.Modbus RTU interoperability.​ The ABB 1MRK000284-AAR01​ speaks Modbus RTU over RS-485 in its typical deployment, which means it drops onto the same serial ring as ABB protection relays, power meters, and third-party devices — useful when the host is not an ABB PLC but a mixture (Schneider, Siemens, SEL) and the binary block just needs to be a Modbus slave. For pure ABB stacks (800xA/AC800M), the module can also be absorbed as a generic Modbus node in Control Builder, keeping engineering simple.

Application Field

The ABB 1MRK000284-AAR01​ is deployed wherever 16 extra binary points are needed in an ABB-flavored or Modbus-RTU-flavored cabinet — most prominently:

• Protection-relay cubicle expansion: RET670/RED670 generator protection, REF615 feeder, REM615 motor protection — when the relay’s onboard BI/BO (typically 16–24 BI, 8–12 BO) is topped out by a large GCB + disconnector + earthing-switch + motor-heater + valve scheme, the ABB 1MRK000284-AAR01​ adds the overflow cleanly inside the same compartment.
• MV switchgear control (VD4/VMAX): breaker 52a/52b, spring-charged, local/remote selector, close-permit, trip-circuit-supervision auxiliary, and panel-annunciation relays — a single ABB 1MRK000284-AAR01​ can cover a whole bay’s auxiliary-contact acquisition and DO drive.
• Power-plant auxiliary systems: lube-oil pump run/fault, jacking-oil pressure switch, seal-oil tank level float, bearing-temp alarm contact, cooling-fan run — all dry-contact signals from the turbine-generator auxiliary skid that feed either the DCS or the electrical SCADA; the ABB 1MRK000284-AAR01​ packages them into one Modbus node.
• Substation & utility yards: disconnector/earthswitch position strings, station-battery charger alarm contacts, transformer cooling-fan run/fault, tap-changer limit contacts — the module is compact enough to live inside the yard’s local control cabinet (LCC) and talk Modbus back to the bay controller.
• Industrial process skids (OEM): compressor packages, pump skids, filter skids where the OEM standardizes on ABB 1MRK/800xA edge and wants a predictable 16-point binary block for vendor-sensor contacts (pressure switch, temp switch, flow-no-flow, vibration trip) and skid-outputs (run lamp, fault relay, standby-request).
• Retrofit of legacy SPACOM panels: plants migrating from SPACOM-era relays to Relion often keep the same 1MRK auxiliary boards; the ABB 1MRK000284-AAR01​ is a common “while-we’re-in-there” add when the original BI/BO count no longer fits the expanded scheme.

Because the ABB 1MRK000284-AAR01​ is a 1MRK infrastructure spare rather than a process-I/O heavyweight, its “application” binds to how many overflow binary points the panel has. Any plant running ABB RET/RED/REF relays, VD4/VMAX breakers, or 800xA skids with binary overflow should inventory AAR01. During protection or switchgear outages (typically 10–20 year refurb window), the binary-I/O boards are proactive-refresh candidates alongside the relay mainboard and the communication interface — cheap insurance against a “channel dead” alarm storm during a unit start-up.