ABB AC500 Modules

Technical Dossier

Product Details And Specifications

ABB AC500 Series: Comprehensive Module Range and Technical Overview

The ABB AC500 is a scalable modular PLC platform deployed across heavy industrial sectors worldwide, including petrochemical refineries, nuclear power stations, offshore platforms, pulp and paper mills, and water treatment infrastructure. Its open architecture — based on IEC 61131-3 programming standards — has made it a preferred automation backbone in facilities requiring long-term operational continuity and deterministic control. The AC500 family spans from compact standalone controllers to high-availability redundant CPU configurations, supporting both legacy PROFIBUS-based installations and modern PROFINET/EtherNet/IP architectures. Its installed base across Europe, Asia-Pacific, and the Middle East represents one of ABB's largest PLC deployment footprints globally.

The Evolution of AC500 Architecture

The AC500 platform was introduced in the early 2000s as ABB's successor to the Advant Controller 31 (AC31) and Masterpiece series, consolidating multiple legacy product lines into a unified modular framework. The first-generation AC500 (S500 I/O system) established the core backplane bus architecture using the S-Bus communication protocol for local I/O expansion. This generation introduced the PM5xx CPU family (PM554, PM564, PM581, PM591) with onboard Ethernet and SD card support.

The second-generation AC500-eCo was introduced as a cost-optimized variant targeting smaller machine-level applications, while the AC500-S (Safety) variant added TÜV-certified SIL 2/3 safety functions compliant with IEC 62061 and EN ISO 13849. The AC500-XC (eXtreme Conditions) variant extended the operating temperature range to -40°C to +70°C for harsh environment deployments. The current generation AC500 V3 (PM5000 series) introduced 64-bit multi-core processing, OPC UA native support, and cybersecurity features aligned with IEC 62443. Compatibility between V2 and V3 I/O modules is maintained at the hardware level, though firmware migration requires careful version management. Sites running first-generation PM5xx CPUs with S500 I/O modules are now in the mature/end-of-life phase; ABB has formally discontinued several PM5xx variants, making third-party lifecycle support critical for facilities unwilling to undertake full system replacement.

AC500 Full Catalog & Functionalities (SKU List)

CPU / Controller Modules

• PM554-T-ETH: Entry-level CPU, 256KB program memory, onboard Ethernet, SD slot
• PM564-T-ETH: Mid-range CPU, 1MB memory, dual Ethernet, PROFIBUS DP master
• PM581-ETH: High-performance CPU, 4MB memory, multi-protocol Ethernet support
• PM591-ETH: Advanced CPU, 8MB memory, redundancy-capable, IEC 61850 support
• PM5650-2ETH: AC500 V3 CPU, 64-bit multi-core, OPC UA, cybersecurity features
• 24031-0-111100000000: AC500 control module, configurable I/O mapping, backplane bus interface

Digital Input (DI) Modules

• DI524: 16x 24VDC digital inputs, S500 I/O bus, IP20 housing
• DI572: 32x 24VDC digital inputs, high-density, S500 bus compatible
• DI581-S: 8x safety digital inputs, SIL 2 certified, AC500-S platform

Digital Output (DO) Modules

• DO524: 16x 24VDC/0.5A digital outputs, S500 bus, short-circuit protected
• DO572: 32x 24VDC digital outputs, high-density configuration

Analog Input (AI) Modules

• AI523: 8x analog inputs, 0–10V / 4–20mA, 12-bit resolution
• AI531: 4x analog inputs, RTD/thermocouple, temperature measurement

Analog Output (AO) Modules

• AO523: 4x analog outputs, 0–10V / 4–20mA, 12-bit resolution

Communication Adapters

• CI501-PNIO: PROFINET IO adapter, S500 bus, IRT capable
• CI502-PNIO: PROFINET IO device adapter, dual-port, media redundancy
• CI504-PNIO: PROFINET IO controller adapter for distributed I/O expansion
• CI541-DP: PROFIBUS DP slave adapter, S500 bus, 12Mbit/s
• CI590-CS31-HA: CS31 bus adapter, legacy AC31 network compatibility

Power Supply Modules

• PS501-PROC-1: AC500 processor module power supply, 24VDC input
• PS560-ME-1: S500 I/O bus power supply, 24VDC, 2A output

Sourcing Hard-to-Find & Obsolete AC500 Parts

DriveKNMS maintains a dedicated inventory pool for discontinued and end-of-life AC500 components, with particular focus on first-generation PM5xx CPUs, legacy S500 I/O modules, and CI5xx communication adapters that are no longer available through ABB's standard distribution channels. For facilities operating AC500 systems installed prior to 2015, sourcing replacement modules through OEM channels is increasingly unreliable due to formal product discontinuation notices issued by ABB for several PM554 and PM564 variants.

DriveKNMS sources verified surplus, refurbished, and new-old-stock (NOS) AC500 modules through a controlled supply chain. Each unit is cross-referenced against ABB's firmware compatibility matrix to ensure the supplied module matches the target system's CPU firmware version and I/O bus revision. For long-term maintenance contracts, DriveKNMS offers reserved stock agreements to guarantee module availability across multi-year operational windows.

Quality Control for the AC500 Range

AC500 modules present specific test challenges due to their backplane bus architecture and multi-protocol communication stacks. DriveKNMS applies the following verification procedures to all AC500 units prior to dispatch:

• Backplane bus continuity test using S-Bus protocol simulation to verify slot addressing and data integrity
• CPU modules are bench-tested with a reference AC500 rack, executing a standardized IEC 61131-3 test program across all supported communication interfaces (Ethernet, PROFIBUS, PROFINET)
• I/O modules undergo channel-by-channel functional verification: digital channels tested at 24VDC nominal, analog channels calibrated against a traceable reference signal source
• Communication adapters are validated for protocol handshake, node address assignment, and data throughput under simulated network load
• Firmware version is read and documented; modules with incompatible or corrupted firmware are reflashed where technically feasible or quarantined
• Final inspection includes visual examination of backplane connectors, capacitor condition, and conformal coating integrity for XC-rated modules

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.