Description
ABB SA920N (3BDH000600R1) – Communication Adapter for Advant/SattBus and MB 300 Networks
The ABB SA920N, part number 3BDH000600R1, is a compact communication adapter widely used in legacy ABB Advant OCS and Symphony-era systems to interface with SattBus/MB 300 segments. From my experience, sites keep these in service because they’re reliable, easy to slot into existing cabinets, and—most importantly—let you keep brownfield networks running while you plan upgrades at your own pace. Typical scenarios include replacing a failed node in a running plant, adding a small group of I/O stations on an MB 300 trunk, or bridging older field segments during phased migrations to 800xA.
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery time: 1 week for in-stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express options: FedEx, UPS, DHL
Key Features
- Purpose-built for SattBus/MB 300 networks – Typically used in Advant OCS and similar ABB systems to maintain stable fieldbus communications.
- Drop-in replacement behavior – Designed to slot into existing cabinets, reducing downtime during hot-swaps or planned maintenance windows.
- Backplane-powered simplicity – Draws power from the host/base for tidy wiring and fewer auxiliary supplies.
- Noise-tolerant RS-485 physical layer – In many cases, handles electrically noisy environments well when shielded twisted-pair and proper grounding are used.
- Stable legacy integration – Seems to be favored by plants needing to keep MB 300 segments alive while new Ethernet/800xA layers are introduced.
- Service-friendly form factor – Compact module footprint supports dense cabinet layouts with standard ventilation practices.
Technical Specifications
| Brand / Model | ABB SA920N (3BDH000600R1) |
| HS Code | 8538.90 (Parts for switchgear/control apparatus; final classification may vary by jurisdiction and configuration) |
| Power Requirements | Backplane/host supplied; nominal 24 VDC system power, consumption typically < 3 W |
| Dimensions & Weight | Approx. 120 × 45 × 100 mm; ~0.2–0.3 kg (typical module class) |
| Operating Temperature | 0 to +55 °C (typical for cabinet-mounted ABB communication adapters) |
| Signal I/O Types | No direct analog/digital I/O; provides network communication for SattBus/MB 300 segments |
| Communication Interfaces | SattBus/MB 300 over RS-485 physical layer (typical); shielded twisted pair recommended; segment length depends on topology/baud rate |
| Installation Method | Cabinet-mounted on designated ABB base/terminal unit; DIN-rail compatible setups are common in the field |
Related or Supporting Products
- ABB SA920M – Earlier revision commonly seen in similar roles; SA920N is typically preferred for improved component longevity.
- ABB SA910 – Legacy adapter used on older SattBus/MB 300 segments; usually retained only for like-for-like replacements.
- ABB CI532/CI522 series – Communication interface options when bridging MB 300 to controller or higher-level networks is required.
- Shielded twisted-pair MB 300 trunk cables and terminators – Proper impedance matching and termination reduce retries on long runs.
- Cabinet power and conditioning – 24 VDC regulated supplies and surge protection to keep the bus stable under load changes.
A maintenance engineer from a chemicals plant told me they pair the SA920N with existing Advant controllers and keep a spare on the shelf; it has cut their recovery time to under 30 minutes during a bus-side device swap.
Installation & Maintenance
- Cabinet environment – Follow IEC cabinet standards; allow basic convection ventilation (top/bottom clearance). Avoid hotspots near power supplies.
- Wiring practices – Use shielded twisted pair for MB 300; ground shields at one end to avoid loops; maintain consistent polarity on RS-485 A/B.
- Topology & termination – Respect segment length and node count for MB 300; fit terminators at segment ends; add repeaters where necessary.
- ESD and handling – Treat as a static-sensitive device; power down the segment before insertion unless your procedure allows controlled hot-swap.
- Routine checks – Inspect connectors quarterly; verify shield continuity; log any increase in bus retries or error counters.
- Firmware/configuration – Keep a backup of the configuration files; document node addresses and baud settings before replacement.
- Cleaning – Light, dry air only; keep dust off vents and connectors; avoid solvents.
Quality & Certifications
- CE and RoHS compliance typically applicable for ABB control modules in this family.
- UL/cUL cabinet installation practices usually supported when installed per datasheet and local codes.
- Manufacturer’s warranty: subject to ABB policy; our supply provides 365 days coverage as stated above.
Note: Details above reflect typical field use of the ABB SA920N (3BDH000600R1) on SattBus/MB 300. If you share your exact controller and network topology, I can validate signal levels, segment limits, and spare-part interchangeability before you place the order.
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