Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model Number | CI626A |
| Order Number | 3BSE005029R1 |
| Product Type | Communication Interface Module |
| System Family | ABB Advant / Legacy DCS Systems |
| Communication Network | Advant Fieldbus 100 (AF100) |
| Application | Controller-to-fieldbus communication |
| Compatible Platforms | Advant Controller systems including AC450-class architectures |
| Installation | ABB controller rack / communication module position |
| Communication Media | AF100 bus connection |
| Configuration | System-specific ABB engineering tools |
| Status | Obsolete / legacy support component |
Product Introduction
ABB CI626A 3BSE005029R1 Overview
The ABB CI626A 3BSE005029R1 is a communication interface module used in ABB Advant automation systems. It provides the connection between controller-level hardware and the Advant Fieldbus 100 (AF100) communication network, allowing distributed field devices and control nodes to exchange process data.
The ABB CI626A 3BSE005029R1 remains relevant in long-service DCS installations where plant operators continue operating Advant-based control systems. For maintenance projects, this module is typically replaced as part of a like-for-like hardware strategy rather than a system redesign.

CI626A 3BSE005029R1
Application Scenarios & Field Pitfalls (The Engineer’s Perspective)
Engineering Pain Point
A process unit has been running for decades, but a communication module failure suddenly isolates several field stations from the control system. The controller may still be healthy, while the actual issue sits in the fieldbus interface layer.
This is common in legacy ABB Advant installations. Replacing a communication module is not only a hardware exchange. Network topology, controller configuration, and firmware compatibility must be checked before returning the system to service.
Typical Applications
- Oil & Gas Facilities – AF100 communication infrastructure connecting process controllers, remote I/O, and field control stations.
- Power Generation Plants – Legacy ABB DCS installations supporting turbine auxiliaries, boiler controls, and balance-of-plant systems.
- Chemical Processing Plants – Distributed process control systems requiring stable controller-to-I/O communication.
- Water Treatment Facilities – Older Advant-based automation systems managing pumps, valves, and process monitoring equipment.
Technical Pitfalls to Avoid
- Verify AF100 Network Configuration
The CI626A operates within an ABB-specific communication architecture. Confirm bus topology, node addressing, and connected devices before replacement.
- Check Firmware and Hardware Revision
Older ABB communication modules may have revision differences that affect compatibility with existing controller software.
- Document Existing Settings Before Removal
Record module position, network connections, and controller configuration. A physically identical replacement still requires correct system parameters.
Related Products
- ABB CI626V1 3BSE012868R1
Updated CI626 family variant for AF100 communication applications. Used in later Advant system configurations with revised hardware features. - ABB CI627 3BSE008799R1
Related Advant communication interface module. Used for different controller/network interface requirements within the same legacy automation family. - ABB CI627A 3BSE017457R1
Later communication module variant used in Advant and migration-related architectures. - ABB CI615
Communication interface module from the same general ABB legacy communication family. Application depends on controller platform and network type. - ABB AC450 Controller System
Advant controller platform commonly associated with legacy ABB DCS installations using communication. - ABB CI532 Series Communication Modules
Communication interface family used for different industrial network connections in ABB controller systems. - ABB PM865K01 3BSE031151R1
AC800M controller package used in newer ABB control architectures. Often considered during migration from older Advant systems. - ABB System 800xA Connectivity Modules
Modern ABB platform components used when integrating or migrating legacy Advant systems into newer control environments.
