Application Scenarios

At a newly commissioned combined-cycle power plant in Germany, engineers required a controller capable of managing over 10.000 I/O points across turbine, boiler, and emissions systems—with zero tolerance for downtime. They selected the UAC326AE in a redundant pair configuration to drive the entire balance-of-plant (BOP) automation. During a grid fault that caused a momentary loss of one controller, the standby UAC326AE took over in under 20 ms, with no disruption to combustion control or steam pressure regulation. The plant reported 99.999% controller availability in its first year, crediting the UAC326AE’s robust redundancy handshake and built-in diagnostics for preventing cascading failures during extreme transients.

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Technical Principles and Innovative Values

Innovation Point 1: Enhanced Dual-Core Processing for Complex Applications – The UAC326AE features a more powerful dual-core engine than earlier AC 800M CPUs, enabling execution of large control programs (including PID loops, sequence logic, and safety interlocks) with minimal scan overhead—critical for fast-response processes like boiler drum level control.

Innovation Point 2: Seamless Redundancy with State Synchronization – In redundant mode, the primary and standby UAC326AE units continuously synchronize application state, I/O data, and communication buffers. Switchover is transparent to field devices and operator stations, ensuring uninterrupted process continuity.

Innovation Point 3: Integrated I/O Bus Eliminates External Adapters – Unlike modular PLCs requiring separate backplane controllers, the UAC326AE connects directly to S800 I/O modules via its onboard I/O bus, reducing latency and hardware count while improving signal integrity.

Innovation Point 4: Cyber-Secure by Design – The UAC326AE supports secure boot, firmware authentication, and role-based access control—aligning with IEC 62443 standards for industrial cybersecurity in critical infrastructure.

Application Cases and Industry Value

In a greenfield LNG liquefaction facility in Qatar, the ABB UAC326AE was deployed across 12 redundant controller pairs to manage cryogenic compressors, refrigerant cycles, and flare systems. The project demanded sub-20 ms response for emergency shutdown sequences. Post-commissioning tests confirmed the UAC326AE achieved 12 ms end-to-end reaction time from sensor input to valve closure—well within safety margins. Over two years of operation, zero unplanned outages were attributed to controller failure. Maintenance teams highlighted the UAC326AE’s built-in web server for remote diagnostics and its compatibility with ABB Ability™ predictive maintenance tools as key enablers of operational excellence.

Related Product Combination Solutions

PM866A: Legacy AC 800M CPU – the UAC326AE serves as its higher-performance, memory-enhanced successor.

CI854A: Communication interface module – extends UAC326AE connectivity to redundant Ethernet I/O networks.

S800 I/O Modules(e.g., AI810. DO810) – connect directly to the UAC326AE’s I/O bus for high-speed signal handling.

TB820: Terminal block – provides power and signal distribution for S800 modules paired with UAC326AE.

TU854: Profibus-integrated baseplate – enables direct fieldbus connectivity from UAC326AE-based systems.

Control Builder Plus: Engineering tool – fully supports UAC326AE configuration, redundancy setup, and online diagnostics.

ABB Ability™ System 800xA: Unified DCS platform – the native environment where UAC326AE delivers maximum integration value.

HIEE401482R001: Optional battery backup module – extends RAM retention during power interruptions for UAC326AE.

Installation, Maintenance, and Full-Cycle Support

Installing the UAC326AE is straightforward: mount on DIN rail or in a rack, connect power, link to redundant Ethernet switches, and attach S800 I/O modules directly to its right-side I/O bus. Redundancy cabling uses a dedicated sync cable between primary and standby units. Commissioning is performed via Control Builder Plus, which auto-detects the UAC326AE, validates firmware, and configures redundancy parameters with guided workflows.

Routine maintenance is minimal—no batteries for program memory (thanks to Flash), and status LEDs indicate power, run mode, redundancy health, and communication errors. In case of failure, the UAC326AE supports hot-swap replacement in redundant systems without process interruption. We provide full lifecycle assurance: every unit is tested for boot integrity, redundancy failover, and I/O communication under load. Our team offers firmware validation, cybersecurity hardening guidance, and 24/7 technical support from certified ABB system architects.

Contact us for a customized solution—whether you’re upgrading an aging DCS, building a new safety-critical facility, or enhancing cybersecurity resilience, the ABB UAC326AE(HIEE401481R001) delivers the performance, reliability, and intelligence your industrial automation backbone demands.