ABB SM811K01
ABB SM811K01 - Image 2

ABB SM811K01

Product Brief:​ The SM811 (sometimes referenced as part of the AC 800M redundant controller kit) is not a CPU itself​ — it is the redundancy synchronization interface & memory retention module​ used with a pair of AC 800M CPUs (PM865/PM866/PM876/PM891). It:

  • Provides the high-speed fiber or LVDS sync link​ between Primary & Standby CPU for state mirroring (image, retentive vars, sequence)
  • Houses the supercap / battery-backed RAM interface​ (or connects to battery on baseplate) ensuring retentive variables survive power loss
  • In many modern AC 800M baseplate kits (BC820), the sync functionality is integrated into the baseplate backplane — SM811K01 in spare lists often means the replacement sync cable + battery module / supercap pack​ or the complete redundancy enable kit.

    The “K01” suffix typically denotes the spare kit: sync cable (short flat cable for two CPUs in same BC820) + battery / supercap module + documentation.

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Category: SKU: ABB SM811K01

Description

ABB SM811K01

  • Technical Specifications (typical SM811 context):
    • Function: Redundancy sync + retentive memory backup support
    • Sync Link: Dedicated high-speed link (≤10 ns skew) — fiber or differential pair inside BC820 baseplate (no external cabling between CPUs in BC820 — the “sync cable” in K01 is for older BC810 dual-CPU carrier or for BC820 if separate)
    • Battery / Supercap: 3.0 V lithium coin cell or supercap on baseplate — backed by SM811 circuit; retains retentive RAM ≥5 yr typical with 24 V off
    • Compatibility: PM865, PM866, PM876, PM891 (AC 800M Gen 2/3); NOT compatible with PM510/PM150 (different arch)
    • Mounting: Plugs into dedicated header on BC820 baseplate OR sits in CPU slot extender (dep. on version); battery mounts on baseplate
    • Operating Temp.: Same as controller (0 °C to +60 °C)
    • Indicators: (if separate module) Sync Active LED, Batt Low LED
  • Functional Features / Application / Material / Structure / Working Principle / Installation / Precautions:
    • Used in every redundant AC 800M node — two CPUs + BC820 baseplate + SM811 functionality (integrated or separate module)
    • After power-up, standby CPU syncs image from primary via sync link → SYNC LED green
    • On primary failure → standby takes over within one scan (<10 ms bump); retentive vars preserved
    • Precaution:​ If replacing a CPU in redundant pair — insert new CPU → it auto-syncs from partner (takes 30–90 s). If replacing baseplate — ensure SM811 battery / supercap transferred or new one installed & battery good. Keep battery replacement per PM (3–5 yr). Firmware on both CPUs must be identical.
    • For BC820: sync is internal — “SM811K01” spare often = battery pack + sync cable (for service). Verify exact content against BOM — some regions sell SM811 as the sync/eeprom module separate from battery.

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