ABB TB840A
ABB TB840A - Image 2

ABB TB840A

Product Brief:​ The CI840A (cataloged in some BOMs as TB840A) is the HN800 bus interface module​ that plugs into the CEX slot of an AC 800M CPU baseplate (BC810 for single; BC820 for redundant — redundant CI840A pair can be used with redundant CPUs). It:

  • Acts as HN800bus master — cyclic scan of up to 32–64 remote S800 I/O stations (each station = RIO600 with CI840A slave)
  • Provides 2 × HN800 ports (A-bus / B-bus) — RJ45 (copper ≤100 m) or ST fiber (multimode ≤2 km typical)
  • Supports redundant HN800 buses & redundant interface modules (1:1 hot-standby CI840A pair — each CPU has its own CI840A; both connected to HN800 A/B)
  • Communicates with AC 800M application via CEX-bus (deterministic I/O image exchange each scan)

    The “A” suffix = latest hardware revision with improved EMC & diagnostics vs. original CI840.

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Category: SKU: ABB TB840A

Description

ABB TB840A

  • Technical Specifications:
    • HN800 Ports: 2 × RJ45 or ST (fiber) — configurable per media module (media converter if fiber)
    • Max Remote Nodes: 32 (practical ≤64 with careful scan time design)
    • Scan Time: Configurable; typical 10–50 ms node update
    • Redundancy: Supports redundant pair (one per CPU in redundant config); also HN800 A/B bus redundancy
    • Power: From CEX-bus (5 V DC, typ. 200 mA)
    • LEDs: Run, Err, Com A, Com B, Warning
    • Mounting: CEX slot of AC 800M baseplate (BC810/BC820) — occupies one CEX position
    • Operating Temp.: 0 °C to +60 °C
    • Firmware: Loaded from AC 800M baseplate; compatible with Control Builder M (match FW version)
    • Certifications: CE, UL, cUL, ATEX Zone 2 (with system cert)
  • Functional Features / Application / Material / Structure / Working Principle / Installation / Precautions:
    • Used whenever S800 I/O is remote​ from AC 800M CPU (different cabinet / field location) — local I/O uses direct ModuleBus cable (TK801V006) — no CI840A needed for local rack
    • Install CI840A into CEX slot of CPU baseplate → connect HN800 cable to Port A (first node) or both A & B if redundant bus
    • In Control Builder M: define “S800 I/O Station” → assign CI840A node address (unique on HN800) → add I/O modules per remote rack → download → verify Com LED flashes (cyclic activity)
    • Precaution:​ Terminate HN800 bus at both ends with 120 Ω (built-in jumper on CI840A or external resistor plug). Verify fiber polarity (Tx→Rx). Firmware on CI840A must match system release — if mismatch, Control Builderwill prompt to download correct FW. For redundant pair: both CI840As identical FW; after first download standby auto-syncs I/O image from primary’s CI840A via backplane.
    • Keep spare (or TB840Aas cataloged) — field replacement is hot-swap (controller remains in RUN if redundant pair; single — brief I/O loss until re-init).

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