ABB CHBX01R 2VAA008575R1 Table Description：CHBX01R, Right‑Side Compact Bus Extender, 2VAA008575R1

General Information

Electrical & Interface Specifications

• Backplane Interface: Redundant HN800 I/O bus connectors (A‑bus / B‑bus), high‑speed 4 Mbit/s redundant I/O communication bus for SD‑series I/O modulesABB Abilit….
• Mechanical Bus Interface: Internal row‑bus connector, terminates HN800 differential bus signals for the entire horizontal I/O row segment.
• Signal Type: Redundant HN800 differential bus signals; no external 24 VDC power input terminals on CHBX01R itself.
• On‑Board Circuitry: Bus termination circuitry, status LED indicators. No process I/O channels for field sensors/actuatorsABB Abilit….
• Bus Performance: HN800 bus baud rate 4 Mbit/s, dual redundant A/B bus for fault‑tolerant communication.
• Power Consumption: Typical 1‑2 W (module self‑consumption only).
• Operation Limitation: Cannot operate standalone. Must be deployed together with CHBX01L, SD‑series I/O modules and Symphony Plus controller; defines the right‑side physical boundary of one horizontal I/O row segment.
• Compatibility Matrix

  ‑ Compatible System: ABB Symphony Plus SD‑Series DCS, HN800 redundant I/O bus system

  ‑ Matching Part: CHBX01L (Left‑side compact bus extender 2VAA008574R1)

  ‑ Compatible I/O modules: All SD‑series SD I/O modules

  ‑ Hot‑swap: Not supported; power‑down the I/O row before replacement.

Environmental Specifications

Main Functions

1. CHBX01R (2VAA008575R1) is the right‑side compact horizontal bus extender for ABB Symphony Plus SD‑Series HN800 redundant I/O bus. It is mounted at right end of a horizontal I/O row, working together with CHBX01L at left‑end to form one complete I/O bus segmentABB Abilit….
2. Provides physical termination for dual redundant HN800 A/B I/O bus on the right boundary of the row. It does not accept external 24 VDC power input; power is delivered from CHBX01L through row backplane.
3. Cooperates with CHBX01L to realize high‑speed redundant HN800 bus communication between Symphony Plus controller and SD‑series field I/O modules; dual‑bus design improves communication reliability for critical power‑plant and process‑control applications.
4. LED status indicators show HN800 bus operating condition for on‑site inspection.
5. No analog / digital field I/O channels; it is purely bus termination hardware, does not directly connect to field transmitters or actuatorsABB Abilit….
6. Typical field failure symptoms

   ‑ Entire horizontal I/O row reports HN800 bus communication fault

   ‑ Redundant bus single‑channel failure alarm

   Common root causes: backplane connector poor contact, bus termination hardware damage.

Typical Applications

1. New‑project configuration and spare‑part replacement for Symphony Plus SD‑series HN800 I/O station right‑side bus extender.
2. Power‑plant, pulp‑paper, chemical process DCS control cabinet I/O rack assembly.
3. Preventive‑maintenance spare‑part inventory for ABB Symphony Plus DCS system.
4. DCS system retrofit and expansion of SD‑series I/O stations.