ABB System 800xA (Extended Automation) is ABB’s flagship DCS platform, used extensively in oil and gas, pulp and paper, mining, and power generation. Its aspect-oriented architecture and unified engineering environment distinguish it from traditional DCS platforms. Engineers new to 800xA often find the learning curve steep, but the platform rewards that investment with deep integration capabilities and a consistent operational model across all plant systems.

800xA Architecture Overview

The 800xA architecture is built around four core systems:

  • Process Portal: The operator interface built on Aspect Objects. Displays are web-based and role-based, meaning different operators see different views of the same plant. This is not just cosmetic — Process Portal uses the same object model as engineering, so an alarm faceplat built by the engineer is exactly what the operator sees.
  • Engineering Workplace (EWP): Unified engineering environment for I/O configuration, control logic, and graphics. All engineering is done through a single client connected to a shared project database, eliminating the version conflicts common in older DCS platforms with standalone engineering tools.
  • Application Controllers (AC800M/AC800PEC): The process controllers running control logic in IEC 61131-3 languages or ABB’s proprietary Control Builder M environment. The AC800M is the workhorse for process control; the AC800PEC is optimised for power and drives applications.
  • Industrial IT Base: The server infrastructure. 800xA uses a distributed server model — Connectivity Servers, Domain Server, Aspect Server — running on Windows Server. Redundant server configurations are standard for critical plants.

What makes 800xA unique is the Aspect Object model. Every plant object (controller, motor, transmitter, pipe segment) is represented as an Aspect Object in the system. Each Aspect Object has multiple aspects — a faceplate aspect, a trend aspect, a maintenance aspect, a document aspect. When an operator clicks on a pump, they see the same pump object whether they are looking at a graphic, an alarm list, or a maintenance log. This consistency is powerful for operations and troubleshooting.

Control Builder M: Engineering Control Logic

Control logic in 800xA is programmed using Control Builder M, which supports IEC 61131-3 languages plus ABB’s own Continuous Function Chart (CFC) and Sequential Function Chart (SFC) environments.

Most process control engineers work primarily in CFC (Continuous Function Chart) for loop control and SFC (Sequential Function Chart) for batch and state-based sequences. Function blocks are drawn graphically and connected with wires, similar to DCS environments from other vendors. ABB provides a large library of pre-built function blocks covering PID control, signal processing, motor control, and safety.

Structured Text (ST) is supported and is the preferred language for complex calculations. Ladder Diagram (LD) and Instruction List (IL) are supported for compatibility but rarely used in process applications.

Version management in Control Builder M is database-driven. Every change is logged with a timestamp and user identity, and the database comparison tool shows exactly what changed between revisions. This is a significant advantage over file-based version control used by some competitors.

I/O Architecture: S800 and S900

800xA uses ABB’s S800 I/O for standard process applications and S900 I/O for HART-intensive field device management. Both connect to the AC800M controller over Modulebus (a proprietary high-speed serial bus) or Ethernet.

  • S800 I/O: Modular I/O with AI, AO, DI, DO, and HART-capable cards. Standard density is 8 channels per module. Supports hot-swap replacement without shutdown for non-safety I/O.
  • S900 I/O: Remote I/O designed for installation in the field, close to instruments. Communicates to the controller over Ethernet. Reduces cabling cost in large plants by terminating field cables locally.
  • AF100 / FOUNDATION Fieldbus: 800xA integrates FOUNDATION Fieldbus H1 segments via AF100 Fieldbus infrastructure. Function blocks in FF field devices can be incorporated directly into the control strategy.

Intelligent Device Management (IDM)

One of 800xA’s strongest capabilities is Intelligent Device Management, delivered through the Device Library Wizard and HART/FF asset management tools. IDM allows engineers and maintenance technicians to:

  • Read device diagnostics and extended HART variables directly from the 800xA operator station
  • Configure HART-capable transmitters from the process graphic without launching a separate asset management tool
  • View predictive diagnostics from smart valves (ABB TZIDC, Fisher FIELDVUE) and detect valve stiction or excessive travel
  • Track device calibration history and maintenance records in the Aspect Object model

This integration reduces the need for separate HART communicators and asset management systems, and means maintenance data lives alongside process data in the same historian.

Redundancy Options

800xA supports redundancy at every layer:

  • Controller redundancy: AC800M controllers can be configured in Hot Standby redundancy, with bumpless transfer in under 50 ms on controller failure.
  • Communication redundancy: Modulebus and FOUNDATION Fieldbus segments support redundant infrastructure. The Process Portal client connects to redundant servers automatically.
  • Server redundancy: The Aspect Server and Connectivity Servers can be made redundant using ABB’s built-in redundancy framework or Windows Server failover clustering.

Getting Started with 800xA

For engineers new to the platform, the recommended learning path is:

  1. Complete ABB’s “System 800xA Overview” e-learning course (available through ABB myABB portal) to understand the architecture
  2. Install the 800xA demo system or request access to an ABB training simulator
  3. Practice creating Aspect Objects, building simple CFC logic, and configuring a faceplate
  4. Work through ABB’s Control Builder M basic programming exercises before attempting a live project

800xA documentation is extensive and well-organised. The System Engineering manual and the Control Builder M programming manual are the two references every 800xA engineer should keep accessible. ABB’s MyControl System portal provides access to all manuals, service notes, and software downloads for registered accounts.

Common First-Time 800xA Troubleshooting Scenarios

Engineers new to 800xA encounter a standard set of first-time issues. Knowing them in advance saves significant commissioning time:

  • Aspect Object not visible in Process Portal: Check that the Aspect Object is in the correct plant structure and that the operator station account has the necessary access rights. 800xA uses aspect-level security.
  • Control logic download fails with database lock: Another engineering session has the object checked out. Use Engineering Workplace’s object lock browser to identify and release the lock before re-attempting.
  • Missing HART variables in IDM: Ensure the DD file version installed in 800xA matches the device firmware version. Mismatched DD files cause IDM to not display all parameters or display them with incorrect data types.