ABB Advant AC800M Modules: SD833,

Technical Dossier

Product Details And Specifications

ABB Advant AC800M Series Technical Notes

The ABB AC800M (Advant Controller 800M) is a distributed control system (DCS) platform deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, pulp and paper mills, and offshore oil and gas platforms. Introduced as the successor to the Advant OCS and Masterpiece 200/300 families, the AC800M architecture is built around the PM8xx processor module family and communicates via the Modulebus backplane and MMS/PROFIBUS fieldbus layers. Its modular design allows scalable configurations from standalone controllers to large multi-node redundant systems. The platform remains one of ABB's most widely installed DCS families globally, with an installed base spanning several decades of continuous operation.

The Evolution of AC800M Architecture

The AC800M platform traces its lineage to the ABB Advant OCS (Open Control System) introduced in the early 1990s. The Masterpiece 200 and Masterpiece 300 controllers established the foundational Modulebus backplane communication protocol, which was carried forward into the AC800M generation. The PM810, PM820, and PM825 processor modules represented the first generation of AC800M CPUs, offering 32-bit processing with deterministic scan cycle control. The PM856 and PM860 modules introduced dual-port Ethernet connectivity and enhanced memory capacity, enabling larger application programs and faster I/O scan rates. The PM861 and PM866 represent the current-generation processors, supporting redundant CPU configurations, IEC 61131-3 programming environments via ABB's Control Builder M software, and OPC UA communication. Compatibility between generations is managed through the S800 I/O system, which interfaces via the S800 I/O bus and supports both legacy TB820 Modulebus adapters and modern CI854 PROFIBUS adapters. Customers migrating from Masterpiece 200/300 to AC800M must account for backplane slot mapping differences and updated firmware dependencies.

AC800M Full Catalog & Functionalities (SKU List)

Power Supply Modules

• SD833: 24 VDC system power supply module for AC800M S800 I/O stations, 120/230 VAC input
• SD834: Redundant 24 VDC power supply module, hot-swap capable for continuous operation
• SD821: 24 VDC power supply unit for Advant Modulebus I/O clusters, 115/230 VAC
• SD822: Redundant power supply for S800 I/O, paired with SD821 for 1+1 redundancy

CPU / Processor Modules

• PM856: AC800M processor module, 32 MB RAM, dual Ethernet, IEC 61131-3 compliant
• PM860: AC800M processor module with extended memory, supports redundant CPU pairing
• PM861: AC800M processor, 64 MB RAM, USB port, enhanced diagnostics
• PM866: AC800M high-performance processor, 128 MB RAM, redundancy-ready, OPC UA
• PM810: First-generation AC800M CPU, 16 MB RAM, single Ethernet port
• PM820: AC800M processor with expanded I/O addressing capacity

Digital Input / Output Modules

• DI810: 24 VDC digital input module, 16 channels, S800 I/O bus interface
• DI811: 120 VAC digital input module, 16 channels, galvanic isolation per channel
• DO810: 24 VDC digital output module, 16 channels, 0.5 A per channel
• DO814: 24 VDC digital output module, 16 channels, 2 A per channel, short-circuit protection
• DO820: Relay output module, 16 channels, SPDT contacts, 250 VAC / 5 A

Analog Input / Output Modules

• AI810: 8-channel analog input module, 4–20 mA / 0–10 V, 12-bit resolution
• AI820: 8-channel analog input module, HART-enabled, 4–20 mA, 16-bit resolution
• AO810: 8-channel analog output module, 4–20 mA, 12-bit resolution
• AO820: 8-channel analog output module, HART pass-through, 4–20 mA, 16-bit

Communication & Fieldbus Adapter Modules

• CI854: PROFIBUS DP master adapter for S800 I/O, supports up to 125 slave devices
• CI855: Modulebus optical adapter for fiber-optic S800 I/O cluster extension
• CI856: PROFIBUS DP slave adapter, connects S800 I/O to third-party DCS masters
• TB820: Modulebus modem for S800 I/O cluster, copper interface, up to 40 m
• TB821: Modulebus modem, extended range, supports up to 100 m copper segment

Sourcing Hard-to-Find & Obsolete AC800M 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.

Quality Control for the AC800M Range

AC800M modules present specific test challenges due to their Modulebus backplane communication protocol and dual-port Ethernet arbitration logic. DriveKNMS operates a dedicated AC800M test bench replicating a live S800 I/O cluster environment, including PM866 controller, CI854 PROFIBUS adapter, and SD833/SD834 power supply pairs. Each module under test is subjected to the following protocol: (1) Visual inspection for capacitor degradation, PCB corrosion, and connector wear; (2) Power-on self-test (POST) verification via Control Builder M diagnostic interface; (3) Modulebus communication integrity test at rated baud rate; (4) I/O channel functional test across full signal range for analog modules; (5) 48-hour burn-in cycle under simulated load conditions; (6) Final firmware version verification against ABB's published compatibility matrix. CPU modules are additionally tested for redundancy switchover behavior and application program retention across power cycles. All test results are documented and supplied with each unit.