ABB AC500 I/O Modules DAI01

Technical Dossier

Product Details And Specifications

ABB AC500 Series Technical Notes

The ABB AC500 is a modular programmable logic controller platform deployed across heavy industrial sectors including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, pulp and paper mills, and water treatment infrastructure. The AC500 architecture is characterized by its scalability: a single CPU module can address hundreds of distributed I/O points via the S500 I/O bus, with deterministic cycle times suitable for safety-instrumented and process-critical applications. The DAI01 is a 16-channel 24 VDC digital input module within the S500 I/O family, designed for direct field signal acquisition from proximity sensors, pushbuttons, and discrete process switches. Its compact form factor and DIN-rail mounting make it a standard component in AC500-based control panels globally.

The Evolution of AC500 Architecture

The AC500 platform was introduced by ABB in the early 2000s as a successor to the CS31 and Advant Controller families. The first generation (AC500 V1) used the S500 I/O bus with a proprietary backplane protocol and supported CPUs from the PM571 to PM591 range. Communication was primarily handled via PROFIBUS-DP and Modbus RTU adapters. The second generation (AC500 V2, circa 2010–2015) introduced expanded memory, faster scan cycles, and native Ethernet/IP and PROFINET support through the CM579 communication module family. The current generation (AC500 V3 / AC500-eCo) extends the platform with IEC 62443 cybersecurity compliance, SD card-based firmware management, and compatibility with the AC500-S safety CPU (PM5650-2ETH) for SIL 3 applications. Backward compatibility between S500 I/O modules and all CPU generations has been maintained, meaning DAI01 and its siblings remain deployable in both legacy V1 installations and modern V3 control architectures. This cross-generational compatibility is a primary reason the S500 I/O module catalog remains in active demand for plant maintenance and expansion projects.

AC500 Full Catalog & Functionalities – SKU List (DAI01 Series Context)

Digital Input Modules (DI)

• DAI01: 16-channel 24 VDC digital input, S500 I/O bus, DIN-rail mount, IEC 61131-2 Type 1/3 compliant
• DAI02: 32-channel 24 VDC digital input, high-density format, dual-row terminal block
• DAI03: 16-channel 120 VAC digital input, for legacy AC field devices
• DAI04: 16-channel 230 VAC digital input, European mains-voltage field wiring

Digital Output Modules (DO)

• DAO01: 16-channel 24 VDC transistor output, 0.5 A per channel, short-circuit protected
• DAO02: 32-channel 24 VDC transistor output, high-density, sourcing type
• DAO03: 8-channel relay output, 230 VAC / 8 A, for motor starter and valve actuator control
• DAO04: 16-channel relay output, 24–230 VAC/VDC, mixed-voltage field applications

Analog Input Modules (AI)

• AAI01: 8-channel analog input, 0–10 V / 0–20 mA / 4–20 mA, 12-bit resolution
• AAI02: 8-channel analog input, ±10 V differential, 15-bit + sign resolution
• AAI03: 4-channel thermocouple input, types J/K/T/E/R/S/B, cold-junction compensated
• AAI04: 4-channel RTD input, PT100/PT1000/Ni100, 3-wire or 4-wire connection

Analog Output Modules (AO)

• AAO01: 4-channel analog output, 0–10 V / 0–20 mA / 4–20 mA, 12-bit resolution
• AAO02: 8-channel analog output, 4–20 mA, for valve positioner and variable-speed drive setpoint control

CPU Modules

• PM571-ETH: Entry-level CPU, 256 KB program memory, 1× Ethernet, 1× RS-232/485
• PM591-ETH: Mid-range CPU, 1 MB program memory, 2× Ethernet, PROFIBUS master option
• PM595-4ETH-F: High-end CPU, 4× Ethernet, SD card, IEC 61131-3 all five languages, AC500 V3 flagship

Communication Modules

• CM572-DP: PROFIBUS-DP master/slave adapter for S500 I/O bus
• CM577-ETH: Modbus TCP / EtherNet/IP communication module
• CM579-PNIO: PROFINET IO controller/device module

Sourcing Hard-to-Find & Obsolete AC500 Parts

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.