Description

The CP405 ABB is a high-performance programmable logic controller (PLC) module from ABB’s AC 800M series, designed for demanding process automation applications requiring reliability, redundancy, and real-time control. As the central processing unit of the AC 800M system, the CP405 ABB serves as the brain of distributed control systems (DCS) in industries such as power generation, oil & gas, water treatment, and mining. It supports full IEC 61131-3 programming standards (including Structured Text, Function Block Diagram, and Ladder Logic) and integrates seamlessly with ABB’s System 800xA engineering environment for unified configuration, diagnostics, and HMI.

Engineered for continuous operation, the CP405 ABB features built-in support for hardware redundancy—allowing two units to operate in hot standby mode with automatic switchover in less than 100 ms upon failure detection. This ensures uninterrupted control in safety-critical processes like boiler management or compressor trains. The CP405 ABB also provides multiple communication interfaces, including dual Ethernet ports for control network and engineering access, plus an integrated PROFIBUS DP master/slave port for connecting remote I/O or legacy field devices. With 32 MB of application memory and a powerful 32-bit RISC processor, it handles complex logic, PID loops, and data logging without performance degradation.

CP405 ABB

Technical Specifications

Main Features and Advantages

Seamless redundancy for zero-downtime operations: The CP405 ABB supports fully synchronized redundant configurations where the standby unit mirrors all process data and program states in real time. Upon primary failure—detected via heartbeat signals over a dedicated sync link—the backup assumes control within one scan cycle, preventing process trips in critical infrastructure like combined-cycle power plants or LNG facilities.

Deep integration with ABB System 800xA: Unlike generic PLCs, the CP405 ABB is natively embedded in ABB’s enterprise-wide automation platform. Engineers can perform online changes, trend analysis, alarm management, and asset optimization—all from a single engineering station. This reduces lifecycle costs and eliminates data silos between control and operations.

Robust industrial communications out of the box: With dual Ethernet ports, the CP405 ABB separates control traffic (e.g., I/O updates) from engineering or HMI traffic, enhancing cybersecurity and network stability. The integrated PROFIBUS DP interface allows direct connection to ABB’s CI854 modules or third-party devices like drives and valves—minimizing gateway requirements and latency.

Long-term availability and backward compatibility: ABB maintains strict obsolescence management for the AC 800M family. The CP405 ABB remains compatible with I/O modules dating back to early 2000s installations, enabling brownfield upgrades without rewiring. Firmware updates preserve existing application logic, protecting decades of engineering investment.

Application Field

The CP405 ABB is widely deployed in continuous-process industries where reliability trumps all. In thermal and hydroelectric power stations, it executes turbine governor logic, boiler sequencing, and generator synchronization—often in redundant pairs to meet IEEE and NERC compliance. Its deterministic response ensures rapid load rejection or islanding during grid disturbances.

In oil refineries and offshore platforms, the CP405 ABB controls distillation columns, flare gas recovery, and emergency shutdown (ESD) systems. Its PROFIBUS connectivity simplifies integration with legacy ABB transmitters and motor control centers, while redundancy prevents costly production halts during hurricanes or equipment faults.

Municipal water and wastewater plants use the CP405 ABB for pump station automation, chemical dosing, and SCADA data aggregation. Even in mining and metals, it manages conveyor networks, crushing circuits, and ventilation—withstanding electrical noise from large VFDs thanks to its robust EMC design. Whether modernizing a 1990s MasterView system or building a new greenfield plant, the CP405 ABB delivers proven, scalable control that lasts decades.

CP405 ABB

Related Products

CP401 ABB: Non-redundant version of the same CPU—lower cost for non-critical applications
CP450 ABB: Higher-end model with faster processor, more memory, and PROFINET support
CI854 ABB: PROFIBUS DP communication module—used when additional fieldbus channels are needed
AI810 ABB: Analog input module (16-channel, ±10 V / 4–20 mA) commonly paired with CP405 ABB
AO810 ABB: Analog output module for valve and actuator control
DI810 / DO810 ABB: Digital I/O modules for discrete signaling and interlocking
AC 800M Rail & Power Supply: Dedicated chassis and PSU (e.g., PS802) required for CP405 ABB operation
PM864 ABB: Successor CPU in the newer AC 800M High Performance series