ABB TB820V2
ABB TB820V2 - Image 2

ABB TB820V2

Product Brief:​ The TB820V2 (commonly called BC820​ in AC 800M literature — “TB” prefix sometimes used in spare-part lists) is the redundant controller baseplate​ for the AC 800M family. It holds:

  • Two CPU slots (left = Primary, right = Standby — or vice versa per config)
  • Two PSU slots (for SD822/SD823/SD831 redundant 24 V DC PSUs)
  • One CEX-bus slot (for CI854, CI840, CI871 etc. — usually occupied by the primary CPU’s CEX card; standby CPU’s CEX card optional if only one CEX-bus interface is used & both CPUs access it via backplane)
  • ModuleBus header (to connect local S800 I/O rack via TK801V006)
  • Integrated sync link between CPUs (high-speed LVDS or fiber — internal to baseplate)
  • Diode-OR for dual PSUs → single 24 V DC bus to CPUs & CEX card

    The “V2” denotes the second hardware revision — improved noise immunity, supports PM876/PM891, and has updated keying to prevent insertion of obsolete PM851/PM861 (which require BC810 or early BC820 V1 — but V2 is generally backward-compatible with PM865/PM866; PM876 requires V2+).

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Category: SKU: ABB TB820V2

Description

ABB TB820V2

  • Technical Specifications:
    • Compatible CPUs: PM865, PM866, PM876, PM891 (PM510/PM150 NOT compatible — they use BC810 single baseplate)
    • Compatible PSUs: SD822 (24 V DC 5 A), SD823 (24 V DC 10 A), SD831 (redundant kit)
    • CEX-Bus Slot: 1 (occupied by CEX option card — e.g., CI854A Profibus DP, CI840A S800 I/O IF)
    • ModuleBus: 1 × 40-pin header — connects to TB521/TB511 S800 I/O rack via TK801V006 flat cable (max 12 modules local; more with repeaters)
    • Redundancy: 1:1 hot-standby; switchover < one scan on primary failure
    • Power: 24 V DC input via two PSUs (diode-OR); typical total system draw ≤30 W (CPUs + CEX + local I/O)
    • Dimensions: ≈285 mm (W) × 125 mm (H) × 180 mm (D) — occupies two standard module slots width in cabinet
    • Mounting: 35 mm DIN rail (heavy-duty) or panel-mount via screws
    • Operating Temp.: 0 °C to +60 °C
    • Certifications: CE, UL, cUL, ATEX Zone 2, marine
  • Functional Features / Application / Material / Structure / Working Principle / Installation / Precautions:
    • Used in every redundant AC 800M node — two PM8xx CPUs + BC820V2 + two PSUs + CEX card
    • After power-up: primary boots; standby syncs → SYNC LED green on standby CPU
    • On primary failure → standby takes over bumplessly; alarm raised
    • Local S800 I/O: connect TK801V006 from BC820 ModuleBus header → TB521 ModuleBus header → I/O scanned directly by CPUs (both see same image)
    • Precaution:​
      • Both CPUs must be identical model & firmware version
      • Both PSUs should be same type — sized for full load + margin (N+1 redundancy)
      • Before removing active CPU → verify standby SYNC LED green & “Redundant State: Synced” in 800xA — removing active forces switchover
      • Firmware version must match Control Builder M version — check compat matrix before upgrade
      • Keep spare BC820V2 if critical — though failure rate extremely low; more common to spare CPUs/PSUs

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