ABB Bailey INFI 90

FAQS

• What is ABB Bailey INFI 90?
  ABB Bailey INFI 90 is a classic distributed control system (DCS) designed by Bailey Controls and later adopted by ABB, primarily used in heavy process industries such as power plants. Its core features include a unique ring-based self-healing fiber optic network and function code programming, renowned for its extremely high reliability and specialized industry-specific control algorithms.
• What are the core architectural features of the INFI 90 system?
  INFI 90 employs a unique "ring-based redundant high-speed network (INFI-NET)" and "function code programming" architecture. Its core advantages are: the ring network has self-healing capabilities, meaning a single point of failure does not affect communication, meeting the stringent high availability requirements of power plants; function codes encapsulate control algorithms into standard modules (such as PID and logic operations), allowing for rapid construction of complex strategies through table-based configuration, lowering the programming threshold for engineers.
• What is the fundamental difference between INFI 90's "function code programming" and the later IEC 61131-3 standard?
  Function code programming is a configuration-based language based on a pre-built algorithm library, while IEC 61131-3 is a descriptive programming language.
• How does the INFI 90 system achieve redundant configuration of controllers and I/O?
  The Symphony system (including Harmony/Net90) is an evolution of INFI 90, with core improvements including: network upgrades, a modernized user interface, and unified engineering tools.
• What is a ring redundant network?
  A ring redundant network is a highly reliable network topology where physical links and nodes are connected end-to-end to form a closed loop. Data can be transmitted along both clockwise and counterclockwise paths. When any single point on the ring experiences a link breakage or a node failure, the network can automatically reconstruct using the reverse path, restoring communication within milliseconds and ensuring uninterrupted data transmission.