Product Overview
When a maintenance engineer needs a reliable communication interface for ABB Ability™ System 800xA, the ABB CI845 Ethernet FCI Module delivers. This Ethernet Fieldbus Communication Interface Module connects S800 I/O or Select I/O to AC 800M controllers. It supports both single and redundant configurations, making it a flexible choice for demanding industrial environments.
Technical Specifications
The CI845 operates with an input voltage range of 19.2 ... 30 V and dissipates only 5 W of power. It features galvanic isolation between the power supply and I/O modules, ensuring signal integrity. The module weighs 225 g (including base) and measures 30 mm wide, 121.7 mm deep, and 135 mm high. It supports up to 12 single or 12 redundant S800 I/O modules and up to 192 Select I/O channels.
Industry Applications
In process industries like oil and gas, the CI845 excels where reliable communication is critical. For example, in a refinery control system, the module's built-in diagnostics and supervision of power supply A and B help engineers quickly identify issues. Its ability to operate in hazardous areas (ATEX II 3G, IECEx, cULus) makes it suitable for Zone 2 locations. The module also supports HART v7 pass-through and Sequence of Events (SOE), enabling detailed process monitoring.
Installation & Setup Guidance
For redundant configurations, install two CI845 modules in a TU860 or TU865 Ethernet Field Communications Interface MTU. The mechanical locking slider disconnects power before removal, allowing safe hot swapping. Always verify the input voltage (19.2 ... 30 V) matches your system power. The module's IP20 protection requires installation in a clean, dry cabinet.
Maintenance & Reliability
From a maintenance perspective, the CI845 offers several features that reduce downtime. Built-in supervision of internal hardware, communication, and incoming system power A and B provides early warnings. The module also monitors cabinet temperature. Regular inspection of LED indicators and diagnostics logs helps catch issues before they escalate. The module supports hot swap, so you can replace it without shutting down the system.
Compatibility & Integration
The CI845 works with ABB AC 800M controllers and supports both Select I/O and S800 I/O on Ethernet. It can be used with single or redundant 24 V power supplies and includes built-in power voting. For HART applications, the module supports HART v7 pass-through and HART variables to the application when using Select I/O. The module also supports SOE for time-stamped event logging.
Selection Guide & Purchasing Advice
Before purchasing, verify your system's power supply voltage (19.2 ... 30 V) and whether you need a single or redundant configuration. The CI845 (article number 3BSE075853R1) is available from SpareTechPLC. We stock this module and can advise on compatibility with your existing ABB System 800xA setup. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
