ABB AC500 XO08R2-A4.0 Relay Output Modules

Technical Dossier

Product Details And Specifications

ABB AC500 XO08R2 Series Technical Notes

The ABB AC500 series is one of the most widely deployed scalable PLC platforms in global heavy industry. Installed across chemical processing plants, offshore oil & gas platforms, pulp & paper mills, water treatment facilities, and power generation stations, the AC500 architecture has maintained a dominant position in process automation since its introduction in the mid-2000s. The XO08R2-A4.0 (1SBP260109R1001) is a relay output extension module within this ecosystem, designed to interface with the AC500's distributed I/O expansion bus. Its 8-channel relay output configuration makes it a standard component in motor control, valve actuation, and discrete switching applications where electrical isolation between the controller and field devices is a hard requirement.

The Evolution of AC500 Architecture

ABB launched the AC500 platform as a successor to the legacy Advant and Masterpiece controller families, targeting mid-to-high complexity automation tasks requiring modular scalability. The architecture is built around a central processing unit (CPU) module paired with a local I/O bus and optional remote I/O expansion via fieldbus protocols including PROFIBUS-DP, CANopen, DeviceNet, and Modbus RTU/TCP.

The platform has evolved through three distinct hardware generations:

• AC500 V1 (2005–2012): Initial release with PM5xx CPU family and S500 I/O modules. Communication options limited to serial and early Ethernet variants.
• AC500 V2 (2012–2019): Expanded CPU range (PM5xx-ETH), enhanced Ethernet/IP support, introduction of the XC (eXtreme Conditions) sub-series for harsh environments (–40°C to +70°C operating range).
• AC500 V3 / AC500-S (2019–present): Safety-rated (SIL 3 / PLe) variants introduced. Expanded IEC 61131-3 programming support via Automation Builder 2.x. Backward compatibility with V1/V2 I/O modules maintained at the hardware level, though firmware alignment is required.

The XO08R2-A4.0 belongs to the S500 I/O extension module family, compatible across V1 and V2 hardware generations. Facilities running legacy AC500 V1 installations face a sourcing constraint: ABB has progressively moved production focus to V3 and safety-rated variants, making S500 extension modules increasingly dependent on secondary market supply chains.

AC500 / S500 Full Catalog & Functionalities (SKU List)

Relay & Digital Output Modules

• XO08R2-A4.0 (1SBP260109R1001): 8-channel relay output extension, 24VDC/230VAC, 2A per channel, electrically isolated contacts
• DO08R-A4.0 (1SAP240100R0001): 8-channel relay digital output, 24VDC/230VAC, 2A, standard S500 bus
• DO16-1 (1SAP241000R0001): 16-channel transistor digital output, 24VDC, 0.5A per channel, high-speed switching
• DO16R-1 (1SAP241100R0001): 16-channel relay digital output, 24VDC/230VAC, 2A per channel
• DO532 (1SAP240200R0001): 32-channel transistor digital output, 24VDC, 0.5A, high-density I/O expansion

Digital Input Modules

• DI08-1 (1SAP240000R0001): 8-channel digital input, 24VDC, standard S500 I/O bus
• DI16-1 (1SAP240600R0001): 16-channel digital input, 24VDC, 0.2ms input filter
• DI16-3 (1SAP240700R0001): 16-channel digital input, 120VAC, for legacy AC field wiring
• DI532-XC (1SAP250600R0001): 32-channel digital input, eXtreme Conditions rated, –40°C to +70°C
• XI08-1 (1SBP260000R1001): 8-channel digital input extension module, S500 bus compatible

Analog Input / Output Modules

• AI08-2 (1SAP250000R0001): 8-channel analog input, 0–10V / 0–20mA / 4–20mA, 12-bit resolution
• AI08-3 (1SAP250100R0001): 8-channel analog input, ±10V / ±20mA, 12-bit, differential inputs
• AO04-1 (1SAP250400R0001): 4-channel analog output, 0–10V / 0–20mA, 12-bit resolution
• AI04-2 AO02-2 (1SAP250200R0001): 4AI + 2AO mixed analog module, 12-bit, 4–20mA
• AI08-XC (1SAP260000R0001): 8-channel analog input, eXtreme Conditions, –40°C to +70°C

CPU & Communication Modules

• PM554-T-ETH (1SAP130100R0270): AC500 CPU, 256KB program memory, Ethernet/IP, PROFIBUS-DP master
• PM564-T-ETH (1SAP130300R0270): AC500 CPU, 1MB program memory, dual Ethernet, SD card slot
• CM572-DP (1SAP170100R0001): PROFIBUS-DP master/slave communication module, 12Mbit/s
• CM575-DN (1SAP170200R0001): DeviceNet master/slave communication module
• CM589-PNIO (1SAP170700R0001): PROFINET IO controller/device communication module

Sourcing Hard-to-Find & Obsolete AC500 XO08R2 Parts

The S500 I/O extension module sub-family, including the XO08R2-A4.0, is in the mature-to-declining phase of its product lifecycle. ABB's official end-of-life communications indicate that several S500 variants have been discontinued from active production, with spare parts availability shifting to authorized service channels and secondary market distributors.

DriveKNMS maintains a dedicated sourcing network for legacy ABB AC500 components. Our approach:

Quality Control for the AC500 XO08R2 Range

The XO08R2-A4.0 and related S500 extension modules present specific test challenges due to their dependency on the AC500 internal I/O bus protocol. Standard bench testing without a live AC500 CPU is insufficient to validate full module functionality. DriveKNMS applies the following test protocol to all AC500 S500 modules:

• Bus communication test: Each module is installed in a live AC500 test rack with a PM554 or PM564 CPU. Bus enumeration, module recognition, and parameter exchange are verified via Automation Builder diagnostic tools.
• Channel-level functional test: For the XO08R2-A4.0, all 8 relay output channels are individually actuated and verified for contact closure, contact resistance (<100mΩ), and coil drive current within specification.
• Isolation test: Relay contact isolation from coil drive circuit verified at 500VDC using a calibrated insulation resistance tester.
• Thermal cycling: Modules destined for XC-rated applications are subjected to a –20°C to +60°C thermal cycle prior to shipment.
• Firmware revision check: Module firmware version is recorded and disclosed to the customer. Compatibility with target CPU firmware version is confirmed prior to dispatch.