ABB Bailey 086444-003 INFI90 MFP Multi-Function Processor Board

Product Description

086444-003 is the ABB Bailey INFI90 Multi-Function Processor (MFP) printed circuit assembly, a core rack-mounted CPU controller card for INFI90 DCS distributed control system. This legacy processor executes continuous process control logic, PID loops, data acquisition and INFI-NET network communication. It fits in standard INFI90 module rack slots, works together with I/O, termination and power modules such as 086345-504 and 086351-003 we previously covered. This is a discontinued legacy spare, widely used in power, petrochemical and chemical process plants.

Key Functions

• Core process control CPU for INFI90 subsystem; executes user control strategy, sequential logic and multi-loop PID control
• INFI-NET high speed redundant network interface for communication with operator stations, other MFP controllers and remote I/O racks
• Handles data exchange with local and remote AI/AO, DI/DO I/O modules, reads field sensor values and outputs control setpoints
• Onboard memory for control program, process history and alarm event storage; lithium backup battery preserves retentive data during power loss
• Front panel diagnostic LEDs for power, RUN/STOP, network link and system fault status; DIP switches for module address and configuration
• Supports hot swap for maintenance in redundant MFP configurations without plant process shutdown
• Built-in watchdog timer for automatic failover and safety protection upon processor hardware or firmware fault

Application Scenarios

• ABB Bailey INFI90 DCS multi-function processor for process control racks
• Thermal power stations, oil & gas, chemical plants, pulp & paper continuous process control
• Legacy INFI90 system spare part replacement and redundant controller retrofit
• Real-time closed-loop control for temperature, pressure, flow and level process variables

Common Issues & FAQ

• Controller offline / INFI-NET communication failure: Check redundant network cable connections, verify node address for address conflict; inspect backplane connectors and cabinet grounding; confirm the partner MFP in redundant pair is healthy.
• Program lost after power outage / RTC reset: Replace aged lithium backup battery; confirm control logic saved to non-volatile flash memory; backup strategy should be maintained for all control configuration files.
• Controller fault LED on / control freeze: Retrieve system diagnostic alarms; common causes include program runtime errors, memory chip degradation, backplane pin oxidation, overheating or network storm.
• Intermittent I/O data mismatch: Verify firmware revision compatibility between MFP and all I/O modules in the rack; check cabinet temperature and cooling fans.
• Refurbished / replacement unit note: After installation, set the correct INFI-NET node address, download the matching control application program. Perform INFI-NET network test, I/O channel scan, redundant failover test and full process sequence validation before putting online. Check capacitor and backup battery health on refurbished boards; firmware revision must match existing INFI90 system specification.